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Start Over Topic catalysis Publisher elsevier
4 results

1. Enteromorpha prolifera-derived Fe 3 C/C composite as advanced catalyst for hydroxyl radical generation and efficient removal for organic dye and antibiotic.

Author

Huang W, Wang F, Qiu N, Wu X, Zang C, Li A, and Xu L

Subjects
Adsorption, Hydrogen Peroxide, Industrial Waste, Iron, Methylene Blue, Norfloxacin isolation & purification, Paper, Waste Disposal, Fluid, Anti-Bacterial Agents isolation & purification, Carbon Compounds, Inorganic chemistry, Catalysis, Coloring Agents isolation & purification, Drug Residues isolation & purification, Hydroxyl Radical chemistry, Iron Compounds chemistry, Nanocomposites chemistry, Oxidants chemistry, Ulva chemistry
Abstract

Enteromorpha prolifera-derived Fe 3 C/C composite has been fabricated through a facile one-step calcination method. As an advanced Fenton-like catalyst, the obtained Fe 3 C/C composite displayed high catalytic reactivity to generate hydroxyl radicals. It is worth to note that the removal rate of methylene blue (MB) could effectively reach 100% in a wide pH range (pH = 2˜12) and the maximum degradation capacity of the composite is 660 mg/g. The stability and reusability of Fe 3 C/C composite catalyst have also been tested, which could remain the removal rate at 100% after 6 consecutive runs. To illustrate the practical application possibility, the Fe 3 C/C composite catalyst was used for degradation of papermaking and dyeing waste water, which could reduce the COD (chemical oxygen demand) value to less than 50. Additionally, the antibiotic norfloxacin (NOR) could also be catalytically removed by the Fe 3 C/C composite and the possible removal pathway has also been proposed. The excellent removal performance of Fe 3 C/C composite for MB and NOR may be attributed to the synergistic effect between porous carbon adsorption and Fe 3 C catalysis. This study not only provides novel insights into recycling of waste biomass, but also paves a new way for the application of Fe 3 C/C in dyes and antibiotics waste water treatment areas., (Copyright © 2019. Published by Elsevier B.V.)

Published
2019
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2. Synthesis and characterization of catalysts produced from paper mill sludge. I. Determination Of NOx removal capability.

Author

Khalili NR, Jain H, and Arastoopour H

Subjects
Carbon chemistry, Chlorides chemistry, Ferric Compounds chemistry, Nitrates chemistry, Refuse Disposal methods, Waste Management methods, Zinc Compounds chemistry, Catalysis, Chemical Industry methods, Nitric Oxide chemistry, Paper, Sewage chemistry
Abstract

Characteristics and catalytic properties of a series of carbon-based catalysts (CBCs) produced from paper mill sludge were evaluated. The major processes involved in the production of the catalysts were chemical activation, impregnation, pyrolysis, and post pyrolysis rinsing. The porous structure, catalytic activity and thermostability of the catalysts were tailored during the production stage by introducing hetero-atoms (zinc chloride, and ferric nitrate) in the carbon structure. Characterization of the produced CBCs included determination of the surface area, pore size, and pore size distribution (PSD) from standard N2-adsorption isotherm data. The extent of graphitization and the presence of metal crystals were identified from X-ray diffraction (XRD). The limit of the catalyst gasification was estimated from thermogravimetric analysis (TGA) conducted in an oxidized environment. The NOx reduction capability of the produced catalysts was evaluated in the presence of carbon monoxide using a fixed bed reactor. The reaction temperature ranged from 300 to 500 degrees C. It was shown that paper mill sludge is an excellent precursor for the production of CBCs with NOx removal capability of 66-94%. The catalytic capability of the produced CBCs varied according to the method of production, catalyst surface properties (surface area, pore structure, PSD), metal composition and reaction temperature. The highest NOx removal capacity was observed for the catalytic reactions carried out at 400 degrees C. The mesoporous catalyst produced with a Zn:Fe molar ratio of 1:0.5 exhibited the maximum NOx removal catalytic activity of 94%.

Published
2000
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3. Development of Bioactive Paper by Capsaicin Derivative Grafting Onto Cellulose

Author

Silvia Elena Barbosa, María L. Goñi, Luis Serrano, Florencia Muratore, Raquel Evangelina Martini, Jalel Labidi, and Thakur, Vijay Kumar

Subjects
Materials science, Nonivamide, Otras Ingeniería de los Materiales, Active packaging, INGENIERÍAS Y TECNOLOGÍAS, Grafting, INSECT REPELLENT, Catalysis, chemistry.chemical_compound, Cellulose fiber, chemistry, ANTIOXIDANT, Ingeniería de los Materiales, PAPER, GRAFTING, Organic chemistry, BIOACTIVE, CAPSAICINOIDS, ANTIMICROBIAL, Bioactive paper, Cellulose, Derivative (chemistry)
Abstract

In this chapter the capsaicin derivative grafting onto cellulose ispresented as an alternative to obtain bioactive papers. First, grafting of nonivamide (capsaicin derivative) onto cellulose fibers using polycarboxylicacid as linking agent is discussed. The effect of different reaction variables(namely, time, temperature, and catalyst amount), on reaction occurrenceand efficacy is analyzed. From this data, the optimal reaction conditionsare selected and then grafting reaction is applied to commercial paper sheets. Final properties like antioxidant, insect repellent, and antimicrobialactivity, as well as mechanical properties of the modified paper are presentedand discussed. Fil: Muratore, Florencia. Universidad Nacional de Córdoba. Instituto de Investigación y Desarrollo en Ingeniería de Procesos y Química Aplicada. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigación y Desarrollo en Ingeniería de Procesos y Química Aplicada; Argentina Fil: Goñi, Maria Laura. Universidad Nacional de Córdoba. Instituto de Investigación y Desarrollo en Ingeniería de Procesos y Química Aplicada. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigación y Desarrollo en Ingeniería de Procesos y Química Aplicada; Argentina Fil: Serrano, Luis. Universidad de Córdoba; España Fil: Labidi, Jalel. Universidad del País Vasco; España Fil: Barbosa, Silvia Elena. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Planta Piloto de Ingeniería Química. Universidad Nacional del Sur. Planta Piloto de Ingeniería Química; Argentina Fil: Martini, Raquel Evangelina. Universidad Nacional de Córdoba. Instituto de Investigación y Desarrollo en Ingeniería de Procesos y Química Aplicada. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigación y Desarrollo en Ingeniería de Procesos y Química Aplicada; Argentina

Published
2018

4. Assessing the application of advanced oxidation processes, and their combination with biological treatment, to effluents from pulp and paper industry

Author

Luis Cortijo, Laura Blanco, Noemi Merayo, Angeles Blanco, and Daphne Hermosilla

Subjects
Paper, Environmental Engineering, Ultraviolet Rays, Health, Toxicology and Mutagenesis, Industrial Waste, 02 engineering and technology, 010501 environmental sciences, engineering.material, Membrane bioreactor, Waste Disposal, Fluid, 01 natural sciences, complex mixtures, Catalysis, 12. Responsible consumption, Bioreactors, Ozone, Environmental Chemistry, Water Pollutants, Waste Management and Disposal, Effluent, 0105 earth and related environmental sciences, Biological Oxygen Demand Analysis, Titanium, Sewage, Waste management, business.industry, Chemistry, Pulp (paper), digestive, oral, and skin physiology, Paper mill, Ingeniería química, Biodegradation, Contamination, Oxidants, 021001 nanoscience & nanotechnology, Pulp and paper industry, Pollution, 6. Clean water, Industria del papel, Kraft process, Wastewater, Sunlight, engineering, Medio ambiente, 0210 nano-technology, business, Oxidation-Reduction
Abstract

The closure of water circuits within pulp and paper mills has resulted in a higher contamination load of the final mill effluent, which must consequently be further treated in many cases to meet the standards imposed by the legislation in force. Different treatment strategies based on advanced oxidation processes (ozonation and TiO2-photocatalysis), and their combination with biological treatment (MBR), are herein assessed for effluents of a recycled paper mill and a kraft pulp mill. Ozone treatment achieved the highest efficiency of all. The consumption of 2.4 g O3 L−1 resulted in about a 60% COD reduction treating the effluent from the kraft pulp mill at an initial pH = 7; although it only reached about a 35% COD removal for the effluent of the recycled paper mill. Otherwise, photocatalysis achieved about a 20–30% reduction of the COD for both type of effluents. In addition, the effluent from the recycled paper mill showed a higher biodegradability, so combinations of these AOPs with biological treatment were tested. As a result, photocatalysis did not report any significant COD reduction improvement whether being performed as pre- or post-treatment of the biological process; whereas the use of ozonation as post-biological treatment enhanced COD removal a further 10%, summing up a total 90% reduction of the COD for the combined treatment, as well as it also supposed an increase of the presence of volatile fatty acids, which might ultimately enable the resultant wastewater to be recirculated back to further biological treatment.

Published
2013