17 results on '"McKay, Gordon"'
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2. Effect of heating rate on the pyrolysis of camel manure
- Author
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Parthasarathy, Prakash, Al-Ansari, Tareq, Mackey, Hamish R., and McKay, Gordon
- Published
- 2023
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3. Biochar development from thermal TGA studies of individual food waste vegetables and their blended systems
- Author
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Elkhalifa, Samar, Parthasarathy, Prakash, Mackey, Hamish R., Al-Ansari, Tareq, Elhassan, Omar, Mansour, Said, and McKay, Gordon
- Published
- 2022
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4. Removal of Methylene Blue from Water Using Magnetic GTL-Derived Biosolids: Study of Adsorption Isotherms and Kinetic Models.
- Author
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Zuhara, Shifa, Pradhan, Snigdhendubala, Zakaria, Yahya, Shetty, Akshath Raghu, and McKay, Gordon
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ADSORPTION isotherms ,SEWAGE sludge ,ENERGY dispersive X-ray spectroscopy ,X-ray photoelectron spectroscopy ,WATER use ,METHYLENE blue - Abstract
Global waste production is significantly rising with the increase in population. Efforts are being made to utilize waste in meaningful ways and increase its economic value. This research makes one such effort by utilizing gas-to-liquid (GTL)-derived biosolids, a significant waste produced from the wastewater treatment process. To understand the surface properties, the biosolid waste (BS) that is activated directly using potassium carbonate, labelled as KBS, has been characterized using scanning electron microscopy and energy dispersive X-ray spectroscopy (SEM-EDS), X-ray photoelectron spectroscopy (XPS), X-ray powder diffraction (XRD), and Brunauer–Emmett–Teller (BET). The characterization shows that the surface area of BS increased from 0.010 to 156 m
2 /g upon activation. The EDS and XPS results show an increase in the metal content after activation (especially iron); additionally, XRD revealed the presence of magnetite and potassium iron oxide upon activation. Furthermore, the magnetic field was recorded to be 0.1 mT using a tesla meter. The magnetic properties present in the activated carbon show potential for pollutant removal. Adsorption studies of methylene blue using KBS show a maximum adsorption capacity of 59.27 mg/g; the adsorption process is rapid and reaches equilibrium after 9 h. Modelling using seven different isotherm and kinetic models reveals the best fit for the Langmuir-Freundlich and Diffusion-chemisorptionmodels, respectively. Additional thermodynamic calculations conclude the adsorption system to be exothermic, spontaneous, and favoring physisorption. [ABSTRACT FROM AUTHOR]- Published
- 2023
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5. Particle size impact on pyrolysis of multi-biomass: a solid-state reaction modeling study.
- Author
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Mariyam, Sabah, Al-Ansari, Tareq, and McKay, Gordon
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CATTLE manure ,PYROLYSIS ,COFFEE grounds ,THERMOGRAVIMETRY ,THERMODYNAMICS - Abstract
Pyrolysis has gained significant attention due to its generation of value-added products from waste feeds in an environmentally friendly manner. The primary purpose of this study is to understand the effect of different particle sizes of biomass wastes – date stones (DS), cow manure (CM), and spent coffee grounds (SCG) – to understand better and design a biomass pyrolysis system. Thermogravimetric analysis of four different sizes of DS, SCG, and CM (range 1 mm to 125 μm) and a mixed sample (for each feed) was conducted at a heating rate of 10K/min from room temperature to 1173.15 K at inert conditions and employed model-based Coats–Redfern equations to understand the kinetic and thermodynamic parameters of the pyrolysis process. All the particle sizes except 355–125 μm for DS and SCG have the best-fit reaction mechanism of Ginstling-Brounshtein (D4). Both activation energy and pre-exponential factor decreased from 18.78 to 5.57 kJ/mol and 1.16 E+10 to 1.48 E+08 with reducing particle sizes. The onset degradation temperature, activation energy, change in enthalpy, and entropy decrease with particle sizes. The product formation is favored for all feeds and particle sizes, as the difference between the enthalpy and activation energies (Ea) is below 10 kJ/mol. As a result of their substantially lower activation energies and better reaction thermodynamics, mixed and smaller particle-sized biomass are favored. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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6. Removal of toxic cadmium using a binary site ion‐exchange material derived from waste printed circuit boards.
- Author
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Xu, Meng, Alyasi, Haya, Ning, Chao, Hui, Chi‐Wai, Mackey, Hamish, and McKay, Gordon
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PRINTED circuits ,CADMIUM ,INDUSTRIAL wastes ,X-ray photoelectron spectroscopy ,ADSORPTION kinetics ,WASTE recycling - Abstract
BACKGROUND: Adsorption has been widely applied in wastewater treatment for heavy metal removal. Due to the high cost of adsorbent materials, various types of materials including agricultural, industrial wastes and naturally abundant materials have emerged as low‐cost adsorbents in recent years. However, enhancement processes need to be developed to improve the adsorption capability of the raw materials. It is still a challenge to find an economic material with high adsorption capacity. This paper demonstrates a strategy to activate a recycled waste material using a simple activating process, while significantly improving the adsorption capacity of cadmium from wastewater. RESULTS: The raw material feedstock is the non‐metallic aluminosilicate material obtained from the recycling of waste printed circuit boards (PCBs). By a simple thermal alkali activation process using potassium hydroxide as activation agent, the product material shows a strong capability of cadmium removal from effluent containing a high adsorption capacity of 2.12 mmol g−1. Initial metal concentration, dosage and pH effect on the adsorption isotherm and kinetics have been investigated. The experimental results include full characterization tests on this waste PCB‐derived adsorbent, and the in situ measurement of cadmium, calcium and potassium ions, since all are involved in the exchange sorption mechanism. CONCLUSION: By combining kinetic modelling analysis and X‐ray photoelectron spectroscopy, the novel adsorption mechanism has been explained and quantified as a dual ion‐exchange mechanism with the millimoles of cadmium exchanged mass balancing with the millimoles of calcium and 0.5 mmol potassium going into solution. © 2021 Society of Chemical Industry (SCI). [ABSTRACT FROM AUTHOR]
- Published
- 2021
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7. Utilization of MWCNTs/Al2O3 as adsorbent for ciprofloxacin removal: equilibrium, kinetics and thermodynamic studies.
- Author
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Balarak, Davoud and McKay, Gordon
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ADSORPTION capacity , *CIPROFLOXACIN , *ADSORPTION isotherms , *EQUILIBRIUM , *AQUEOUS solutions , *ADSORPTION (Chemistry) - Abstract
In the present study, the adsorption behavior of ciprofloxacin (CIP) from aqueous solution onto MWCNTs/Al2O3 was studied using batch experiments. Physical characterization of MWCNTs/Al2O3 was determined by SEM, XRD, and BET. The effective parameters investigated included: initial CIP concentration, contact time, MWCNTs/Al2O3 mass, and temperature. Based on experimental results and correlation coefficients, the rate of CIP adsorption followed the pseudo-second-model kinetics. Complete compatibility of the adsorption isotherm process was achieved with the Langmuir model, and the maximum adsorption capacity reached 41.73 mg/g under the optimized conditions (pH = 7, MWCNTs/Al2O3 dose = 1.2 g/L, contact time = 60 min, initial concentration = 10 mg/L, and temperature= 45 °C). The adsorption capacities based on the Langmuir model at different temperatures, 273, 288, 303, and 318 K, were equal to 72.18, 75.92, 79.65, and 83.47 mg/g, respectively. The determined parameters of the thermodynamic studies demonstrated the endothermic and spontaneous nature of the biosorption. The mean free energy was estimated from D–R isotherm model to be 0.316–0.707 KJ/mol, which clearly proved that the adsorption experiment followed a physical process. The data suggest that MWCNTs/Al2O3 could be used as a highly effective adsorbent material with a high capacity for the removal of antibiotics from water and wastewater. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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8. Preparation and characterization of modified rice husks by biological delignification and acetylation for oil spill cleanup.
- Author
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Wang, Zhixuan, Saleem, Junaid, Barford, John P., and McKay, Gordon
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OIL spill cleanup ,RICE hulls ,DELIGNIFICATION ,CELLULOSE nanocrystals ,ACETYLATION ,ASPERGILLUS flavus ,POLYURETHANES ,POLYPROPYLENE - Abstract
Cellulose is widely used as an effective sorbent to treat wastewater. Cellulosic sorbents have the advantage of biodegradability, as they are natural plant-based materials, compared with the synthetic materials such as polypropylene (PP) or polyurethane (PU). Among the raw biomass materials used for cellulose production, rice husk is one of the most cost competitive and widely available. In this work, biological treatments are compared to find the most effective treatment method for cellulose fibre production from rice husk. Using biological delignification, cellulose was extracted from raw rice husk and acetylated to acquire hydrophobicity. Delignification was performed using both bacteria and fungi and their results were compared. The white-rot fungi strain using 'Aspergillus flavus CICC 40258' was found to be the most effective treatment method, achieving a modified product with up to 55% w/w cellulose concentration. Acetylation further facilitated the sorption process and the maximum oil uptake capacity using delignification and acetylation treatment was found to be 20 g/g. The as-prepared sorbents exhibited high oil uptake rates and saturation capacity was reached after 5 min of contact with oil. The kinetic study presents a good correlation with the pseudo-second order model. The isothermal studies demonstrated that the oil sorption capacity of rice husk follows the Langmuir model as compared with the Freundlich model. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
9. Removal of cadmium from waters by adsorption using nanochitosan.
- Author
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Alyasi, Haya, Mackey, Hamish R, and McKay, Gordon
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ADSORPTION capacity ,CADMIUM ,LANGMUIR isotherms ,FUNCTIONAL groups ,WATER use ,HYDROXYL group - Abstract
This study is based on the removal of cadmium from water by adsorption onto nanochitosan in order to reduce the impact of cadmium toxicity to humans and animals. The adsorption of cadmium onto this particular nanochitosan is a novel study assessed through equilibrium and kinetic experiments. It provides an effective method of cadmium removal to avoid cadmium health impacts described herein. The influence of different parameters on the effectiveness and efficiency of cadmium adsorption onto nanochitosan are presented by studying the effects of pH, initial cadmium concentration and the dosage of nanochitosan. Commonly used equilibrium models are described, and the discussion focuses on an analysis of different isotherm and kinetic models to determine the best fit model for predicting the cadmium–nanochitosan adsorption capacity. All models were studied for their statistical significance using two error methods; the Sum of Squared Error to the natural experimental data and the R
2 method to the linearised experimental data. Since the R2 values were very close, the best fit is described according to the findings of the minimum Sum of Squared Error values. The capacity of nanochitosan was found to be 1.96 mmol Cd/g adsorbent. Most previous research studies propose a Langmuir equilibrium model for the adsorption of cadmium on chitosan and nanochitosan; however in the present study, three isotherms were tested; the best fit isotherm was the SIPS followed by the Langmuir, and the best fit kinetic model was the pseudo-second order followed by the Elovich model. The SIPS model indicates a multiple adsorption mechanism, a second-order chemisorption mechanism with two main complexation bonding methods, namely, a complex with one amine functional group and a second complexing type with two amine groups and two hydroxyl groups. [ABSTRACT FROM AUTHOR]- Published
- 2020
- Full Text
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10. High-performance removal of toxic phenol by single-walled and multi-walled carbon nanotubes: Kinetics, adsorption, mechanism and optimization studies.
- Author
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Dehghani, Mohammad Hadi, Mostofi, Masoome, Alimohammadi, Mahmood, McKay, Gordon, Yetilmezsoy, Kaan, Albadarin, Ahmad B., Heibati, Behzad, AlGhouti, Mohammad, Mubarak, N.M., and Sahu, J.N.
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MULTIWALLED carbon nanotubes ,REACTION mechanisms (Chemistry) ,STRUCTURAL optimization ,CHEMICAL kinetics ,ADSORPTION (Chemistry) ,PHENOL - Abstract
The adsorption capabilities of two nano-sized adsorbents: multi-walled carbon nanotubes (MWCNTs) and single-walled carbon nanotubes (SWCNTs) were investigated for the removal of toxic phenol. The maximum adsorption capacities of MWCNTs and SWCNTs were determined as 64.60 and 50.51 mg/g, respectively. Adsorption kinetics followed the pseudo-second order model for both adsorbents. The optimum conditions using SWCNTs and MWCNTs were pH 6.57 and 4.65, phenol concentration 50 and 50 mg/L, dose 1.97 and 2 g/L and contact time 36 and 56 min, respectively. The results indicated that MWCNTs and SWCNTs were proven as high-performance adsorbents for toxic phenol removal from wastewater. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
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11. Co-pyrolysis of biomass and binary single-use plastics: synergy, kinetics, and thermodynamics.
- Author
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Mariyam, Sabah, Parthasarathy, Prakash, Pradhan, Snigdhendubala, Al-Ansari, Tareq, and McKay, Gordon
- Abstract
Waste management is an increasing global concern due to the rise in urbanization and industrialization. This study examines the co-pyrolysis of date pits (DP) and single-use plastics (polypropylene-PP and Styrofoam-PS) as a way to create value-added products. Single, binary, and ternary mixtures were pyrolyzed at three different heating rates to understand the synergy, kinetics, and thermodynamics. The results showed positive synergy and reduced activation energies during co-pyrolysis, due to varying reaction mechanisms. The positive values of ∆H, ∆G, and negative ΔS indicate endothermic non-spontaneous reactions and disorder in the products instead of the reactants during pyrolysis. Future studies should explore upscaling this process for sustainable energy production. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
12. Super high removal capacities of heavy metals (Pb2+ and Cu2+) using CNT dendrimer.
- Author
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Hayati, Bagher, Maleki, Afshin, Najafi, Farhood, Daraei, Hiua, Gharibi, Fardin, and McKay, Gordon
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HEAVY metals , *CARBON nanotubes , *DENDRIMERS , *AQUEOUS solutions , *LANGMUIR isotherms , *CHEMICAL kinetics - Abstract
This research demonstrates the capability of carbon nanotubes (CNT) modified with four generations of poly-amidoamine dendrimer (PAMAM, G4) to remove Cu 2+ and Pb 2+ heavy metals from aqueous solution in single and binary component systems. Uniquely high adsorption capacities for copper and lead, which are 3333 and 4870 mg/g respectively, were achieved. FTIR, H 1 NMR, Zeta potential, SEM and TEM techniques were employed for characterizing the synthetic nanocomposite and indicated that the dendrimer functionalized CNTs have been synthesized. The effects of several parameters including initial metal ion concentration, solution pH and the nanocomposite dosage were studied. The experimental data were analyzed by the Langmuir and Freundlich isotherms and the pseudo-first order and pseudo-second order kinetics models. The maximum adsorption occurred at pH = 7. The adsorption process for Cu 2+ and Pb 2+ in single and binary component systems fit the Langmuir and extended Langmuir models respectively. This study also tested the kinetic sorption of the metals on PAMAM/CNT in single and binary component metal systems at various metal ions concentrations. The results showed that PAMAM/CNT nanocomposite was a super-adsorbent, able to uptake uniquely large quantities of heavy metal from single and binary component liquid phase. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
13. Amine functionalized multi-walled carbon nanotubes: Single and binary systems for high capacity dye removal.
- Author
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Maleki, Afshin, Hamesadeghi, Unes, Daraei, Hiua, Hayati, Bagher, Najafi, Farhood, McKay, Gordon, and Rezaee, Reza
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COLOR removal (Sewage purification) , *AMINES , *MULTIWALLED carbon nanotubes , *BINARY mixtures , *FOURIER transform infrared spectroscopy - Abstract
The aim of this study was to develop a feasible and cost effective method to produce amine functionalized multi-walled carbon nanotubes (CNT-NH 2 ) and investigate the ability of this CNT-NH 2 material to adsorb anionic dyes in single and binary (mixture of dyes) systems. For this purpose, pristine CNTs were functionalized by primary and secondary functional groups namely (-NH2) and (-NH), respectively. Acid Blue 45 (AB45) and Acid Black 1 (AB1) were used as anionic dye models for adsorption. FTIR, SEM, BET, Raman Spectra, and Zeta potential measurements have been employed for characterizing the synthetic nanocomposite and these techniques indicated that the amino functionalized CNTs have been favorably synthesized. The effects of different operational parameters including pH, initial dye concentration, adsorbent dosage, and salt on dye removal were evaluated. The dye adsorption isotherm and kinetics were also studied. The results of this study indicated that the stronger interactions between CNT-NH 2 and AB1 suggest a higher adsorption of AB45 compared to AB1 in both single and binary dye systems. Moreover, the maximum adsorption capacities of the studied functionalized nanotube in single dye solutions, for AB45 and AB1 were 714 and 666 mg g −1 , respectively. These capacities are exceptionally high for the removal of acid dyes. It was found that AB45 and AB1 adsorption on the CNT-NH 2 followed the Langmuir isotherm model and pseudo-second order kinetics model in both single and binary systems. According to the results of this study the CNT-NH 2 were an effective adsorbent to remove anionic dyes from single and binary systems. [ABSTRACT FROM AUTHOR]
- Published
- 2017
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14. Synthesis and characterization of PAMAM/CNT nanocomposite as a super-capacity adsorbent for heavy metal (Ni2 +, Zn2 +, As3 +, Co2 +) removal from wastewater.
- Author
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Hayati, Bagher, Maleki, Afshin, Najafi, Farhood, Daraei, Hiua, Gharibi, Fardin, and McKay, Gordon
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CARBON nanotubes , *HEAVY metals , *WASTEWATER treatment , *FUNCTIONAL groups , *CHEMICAL kinetics - Abstract
The water cleaning applications of carbon nanotubes (CNT) have generated much research interest since their initial discovery. However, in the early stages of research, the efficiency of CNTs for the removal of heavy metal ions has been severely limited because of the intense agglomeration of CNTs and their deficiency of functional groups. In this research, a new method has been discovered for the preparation of dendrimer functionalized CNTs and a PAMAM/CNT nanocomposite was prepared. FTIR, SEM, TEM, Raman spectroscopy, zeta potential measurements, and dispersion observing methods have been employed for characterizing the synthetic nanocomposite and these techniques indicated that the dendrimer functionalized CNTs have been favorably synthesized. In addition, the uniquely high adsorption capacities properties of PAMAM/CNT nanocomposite for Ni 2 + , Zn 2 + , As 3 + , Co 2 + were examined. The effects of several parameters including initial metal ion concentration, temperature, solution pH, the nanocomposite dosage and contact time were studied. The experimental data were analyzed using equilibrium isotherm relationships (Langmuir, Temkin and Freundlich) and the uniquely high adsorption capacities and rates were studied using (pseudo-first order, intraparticle diffusion and pseudo second-order) adsorption kinetics models. The results indicated that the maximum adsorption occurred at pH = 8. With increasing nanocomposite dosage and increasing contact time, there was increased adsorption capacity. Analysis of the adsorption process demonstrated that the Langmuir isotherm and pseudo-second order kinetics are the most appropriate models for heavy metal ions adsorption onto PAMAM/CNT nanocomposite. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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- View/download PDF
15. Optimization and kinetics of sunflower oil methanolysis catalyzed by calcium oxide-based catalyst derived from palm kernel shell biochar.
- Author
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Kostić, Milan D., Bazargan, Alireza, Stamenković, Olivera S., Veljković, Vlada B., and McKay, Gordon
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CATALYSTS , *SUNFLOWER seed oil , *LIME (Minerals) , *BIOCHAR , *METHANOLYSIS , *FATTY acid methyl esters , *ACTIVATION energy - Abstract
Sunflower oil methanolysis over CaO - based palm kernel shell biochar (PKSB) catalyst was assessed by coupling full factorial design with modeling, optimization and kinetic studies. According to the analysis of variance, the effect of reaction temperature and methanol-to-oil molar ratio on the fatty acid methyl ester (FAME) synthesis is significant, while the effect of catalyst loading is statistically negligible. The optimum reaction conditions are found to be catalyst loading of 3 wt%, temperature of 65 °C and methanol-to-oil molar ratio of 9:1, ensuring the best FAME content of 99%. The kinetic model of the methanolysis of sunflower oil, catalyzed by PKSB-based catalyst, combines the changing- and first-order reaction rate laws with respect to triacylglycerols and FAMEs, respectively. The high activation energy (108.8 kJ/mol) indicates the temperature sensitivity of the reaction. The CaO-based PKSB catalyst can be reused without any treatment in three consecutive cycles with no significant drop in activity. Since the calcium content in the biodiesel product is higher than the standard limit, the overall process should include a purification stage. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
16. Kinetic and equilibrium studies of hydrophilic and hydrophobic rice husk cellulosic fibers used as oil spill sorbents.
- Author
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Wang, Zhixuan, Barford, John P., Hui, Chi Wai, and McKay, Gordon
- Subjects
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HYDROPHILIC compounds , *HYDROPHOBIC surfaces , *CHEMICAL spills , *HYDROGEN peroxide , *SEMICONDUCTOR doping - Abstract
In this work, rice husk cellulosic sorbents are produced by both chemical and biological pretreatment. The results indicate that the sorbent pretreated by sodium hydroxide (NaOH) and hydrogen peroxide (H 2 O 2 ) contains up to 87.75% cellulosic concentration. Acetylated sorbents produced from both NaOH/H 2 O 2 and Aspergillus flavus pretreated rice husks are compared with raw rice husk and non-acetylated rice husk sorbents for oil sorption capacities. By plotting oil uptake capacity against contact time, the optimum theoretical sorption capacity of acetylated chemical pretreated rice husk sorbent is 28.2 g/g RMG 386 after 15 min dripping. The sorption data shows that the modified rice husk sorbents achieve saturation after only 3–5 min of contact with both RMG 386 marine diesel and corn oil. The experimental data of acetylated chemical pretreated rice husk sorbent is analyzed using the pseudo-first order, the pseudo-second order and the intraparticle diffusion models. The model results indicate that the pseudo-second order model accurately correlates with the oil sorption data. In terms of the equilibrium isotherm analysis, the Freundlich model provides the best fit to the experimental data. As a result, the acetylated rice husk sorbent has shown to significantly outperform the non-acetylated sorbent with a high oleophilic and hydrophobic capacity with up to 19.66 g/g RMG 386 oil uptake capacity compared to 8.26 g/g by the non-acetylated rice husk sample in an aqueous medium. [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
- View/download PDF
17. Recent developments on sewage sludge pyrolysis and its kinetics: Resources recovery, thermogravimetric platforms, and innovative prospects.
- Author
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Naqvi, Salman Raza, Tariq, Rumaisa, Shahbaz, Muhammad, Naqvi, Muhammad, Aslam, Muhammad, Khan, Zakir, Mackey, Hamish, Mckay, Gordon, and Al-Ansari, Tareq
- Subjects
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WASTE recycling , *PYROLYSIS kinetics , *WASTEWATER treatment , *SEWAGE sludge , *MACHINE learning , *MODELS & modelmaking - Abstract
• A review on sources and composition of sewage sludge for pyrolysis. • Thermal degradation studies and behavior of sewage sludge using TGA. • Review of mechanism and principles of pyrolysis process for sewage sludge. • Comprehensive discussion on the selection of kinetic models for scale up. • Application of machine learning tool forprediction of kinetic data. Sewage sludge is a by-product of the wastewater treatment process, which has the potential to be a source of transport fuels, heat, and power using the pyrolysis process. Considering the prevalence and disposal issues associated with sewage sludge, the objective of this study is to critically review the recent advancements in sewage sludge pyrolysis and its kinetics obtained using the thermogravimetric techniques, and other associated different kinetic models documented in the literature. The study will identify optimum operating conditions and design parameters to obtain high yields. The state-of-the-art perspectives and the challenges associated with full-scale implementation are highlighted for biofuels and resource recovery from the sewage sludge. Furthermore, machine-learning approaches in thermal kinetics of pyrolysis are presented and discussed in terms of their effectiveness in predicting thermal kinetics data. Finally, the challenges for a successful implementation and commercial viability of sewage sludge pyrolysis are discussed. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
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