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126 results on '"Lubguban, Arnold A."'

8. Sequestration of Methylene Blue Dye in a Fixed-Bed Column Using Activated Carbon-Infused Polyurethane Composite Adsorbent Derived from Coconut Oil.

Author

Estrada, Renz John R., Tomon, Tomas Ralph B., Fernandez, Rubie Mae D., Omisol, Christine Joy M., Dumancas, Gerard G., Alguno, Arnold C., Ramos, Maria Sheila K., Malaluan, Roberto M., and Lubguban, Arnold A.

Abstract

In this research, a new method of treating wastewater is introduced using a highly recyclable and sustainable material derived from coconut oil. This material aims to address the issues commonly faced by conventional sorbents, such as limited performance and costly production. These challenges impede a sorbent material from unlocking its full utility in treating wastewater. An exceptional sorbent material was synthesized by incorporating coconut shell-based activated carbon (AC) into a coconut oil-based polyurethane matrix to produce an activated carbon-infused polyurethane (ACIP). The effective adsorption was elucidated by the synergistic interaction between the ACIP material and methylene blue (MB) through electrostatic attraction, π-π interactions, and hydrogen bonding. To provide an exhaustive analysis of the ACIP material, several analytical techniques were employed, including Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM) analysis, X-ray diffraction (XRD) analysis, and thermogravimetric analysis (TGA). A detailed assessment using a fixed-bed column setup investigated its adsorption behavior by encompassing various factors such as inlet concentration, adsorbent bed height, feed flow rate, and solution pH. Results revealed that the ACIP composite exhibited a maximum adsorption capacity of 28.25 mg g−1. Empirical evidence with a high correlation coefficient (R2 > 0.93) obtained from the Thomas and Yoon–Nelson model suggests the suitability of the composite material to operate efficiently under these diverse circumstances. Notably, after five consecutive adsorption–desorption cycles, ACIP demonstrated its remarkable reusability by maintaining 86% of its regeneration efficiency. Given its outstanding performance and potential for scalability, this innovative ACIP composite presents a more sustainable approach to addressing wastewater issues within industrial environments. [ABSTRACT FROM AUTHOR]

Published
2024
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9. Upcycling PVC and PET as Volume-Enhancing Functional Fillers for the Development of High-Performance Bio-Based Rigid Polyurethane Foams.

Author

Ochigue, Princess Claire D., Dingcong Jr., Roger G., Bondaug, John Christian S., Magalong, Brian Christian G., Dumancas, Gerard G., Gutierrez, Carlo S., Alguno, Arnold C., Malaluan, Roberto M., Lubguban, Arnold A., and Bacosa, Hernando P.

Abstract

Polyvinyl chloride (PVC) and polyethylene terephthalate (PET) contribute significantly to global plastic waste, with only 9% recycled in recent years. In this work, these plastic wastes were upcycled as functional fillers to improve the rigid polyurethane foam (RPUF) properties. To attain this target, we leveraged the intrinsic polarity of the C=O and C-Cl groups of PVC and PET to induce intermolecular attractions with the N-H groups of the polyurethane matrix, evidenced by the observed IR peak shifts. This enhanced the nucleating effect during foaming, increasing the foams' compressive strengths by 77% and 22% with the addition of 10% PVC and 5% PET filler, respectively. Furthermore, the addition of PVC and PET fillers increased the foam volume. Thus, the collective utilization of PPW and its corresponding impact on the CO-based RPUF's properties signifies a reduction in carbon dioxide emissions by 14.15% and 17.52% for PVC and PET, respectively. Moreover, thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) revealed improved thermal stability and degradation profiles of the produced RPUFs. Overall, this work highlights potential advancement in environmentally responsible upcycling strategies for common end-of-life plastic wastes, while enhancing rigid foam properties. [ABSTRACT FROM AUTHOR]

Published
2024
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10. Elucidating the Impact of Polyol Functional Moieties on Exothermic Poly(urethane-urea) Polymerization: A Thermo-Kinetic Simulation Approach

Author

Mendija, Leanne Christie C., primary, Dingcong, Roger G., additional, Alfeche, Fortia Louise Adeliene M., additional, Al-Moameri, Harith H., additional, Dumancas, Gerard G., additional, Tan, Noel Peter B., additional, Malaluan, Roberto M., additional, Alguno, Arnold C., additional, and Lubguban, Arnold A., additional

Published
2024
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11. Facile Synthesis of Band Gap-Tunable Kappa-Carrageenan-Mediated C,S-Doped TiO2 Nanoparticles for Enhanced Dye Degradation

Author

Erjeno, Daisy Jane D., primary, Asequia, Dan Michael A., additional, Osorio, Carlo Kurt F., additional, Omisol, Christine Joy M., additional, Etom, Andrei E., additional, Hisona, Renzo Miguel R., additional, Tilendo, Amierson C., additional, Triana, Ann Pearl G., additional, Dumancas, Gerard G., additional, Zoleta, Joshua B., additional, Alguno, Arnold C., additional, Malaluan, Roberto M., additional, and Lubguban, Arnold A., additional

Published
2024
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12. Dopamine-Functionalized Gold Nanoparticles for Colorimetric Detection of Histamine

Author

Unabia, Romnick B., primary, Reazo, Renzo Luis D., additional, Rivera, Rolen Brian P., additional, Lapening, Melbagrace A., additional, Omping, Jahor L., additional, Lumod, Ryan M., additional, Ruda, Archie G., additional, Sayson, Noel Lito B., additional, Dumancas, Gerard, additional, Malaluan, Roberto M., additional, Lubguban, Arnold A., additional, Petalcorin, Gaudencio C., additional, Capangpangan, Rey Y., additional, Latayada, Felmer S., additional, and Alguno, Arnold C., additional

Published
2024
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13. Crotonaldehyde

Author

Dumancas, Gerard G., primary, Viswanath, Lakshmi, additional, Wang, Rosa, additional, Gondek, Emily, additional, Lageshetty, Sathish Kumar, additional, Solivio, Beulah, additional, Lubguban, Arnold A., additional, and Malaluan, Roberto M., additional

Published
2022
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14. Quinone

Author

Dumancas, Gerard G., primary, Viswanath, Lakshmi, additional, Wang, Rosa, additional, Gondek, Emily, additional, Lageshetty, Sathish Kumar, additional, Solivio, Beulah, additional, Lubguban, Arnold A., additional, and Malaluan, Roberto M., additional

Published
2022
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18. Facile Synthesis of PEGylated Gold Nanoparticles for Enhanced Colorimetric Detection of Histamine

Author

Omping, Jahor, primary, Unabia, Romnick, additional, Reazo, Renzo Luis, additional, Lapening, Melbagrace, additional, Lumod, Ryan, additional, Ruda, Archie, additional, Rivera, Rolen Brian, additional, Sayson, Noel Lito, additional, Latayada, Felmer, additional, Capangpangan, Rey, additional, Dumancas, Gerard, additional, Malaluan, Roberto, additional, Lubguban, Arnold, additional, Petalcorin, Gaudencio, additional, and Alguno, Arnold, additional

Published
2024
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19. Valorization of Agricultural Rice Straw as a Sustainable Feedstock for Rigid Polyurethane/Polyisocyanurate Foam Production

Author

Dingcong, Roger G., primary, Ahalajal, Mary Ann N., additional, Mendija, Leanne Christie C., additional, Ruda-Bayor, Rosal Jane G., additional, Maravillas, Felrose P., additional, Cavero, Applegen I., additional, Cea, Evalyn Joy C., additional, Pantaleon, Kaye Junelle M., additional, Tejas, Kassandra Jayza Gift D., additional, Limbaga, Edison A., additional, Dumancas, Gerard G., additional, Malaluan, Roberto M., additional, and Lubguban, Arnold A., additional

Published
2024
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20. Development of High-Performance Coconut Oil-Based Rigid Polyurethane-Urea Foam: A Novel Sequential Amidation and Prepolymerization Process

Author

Hipulan, Louell Nikki A., primary, Dingcong, Roger G., additional, Estrada, Dave Joseph E., additional, Dumancas, Gerard G., additional, Bondaug, John Christian S., additional, Alguno, Arnold C., additional, Bacosa, Hernando P., additional, Malaluan, Roberto M., additional, and Lubguban, Arnold A., additional

Published
2024
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27. Characterization and Application of Rice Straw-Based Polyurethane Foam Blocks for Soil Erosion Control

Author

Maravillas, Felrose P., primary, Omisol, Christine Joy M., additional, Abilay, Gerson Y., additional, Lasquite, Nicholas L., additional, Aguinid, Blessy Joy M., additional, Estrada, Dave Joseph E., additional, Ruda-Bayor, Rosal Jane, additional, Cea, Evalyn Joy C., additional, Cavero, Applegen I., additional, Ahalajal, Mary Ann N., additional, Lorenzo, Glen A., additional, Malaluan, Roberto M., additional, Dumancas, Gerard G., additional, and Lubguban, Arnold A., additional

Published
2023
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28. Anti-Corrosion Properties of Polyaniline/Polyurethane Composite Coatings on Mild Steel Using Coconut-Based/PPG Blend Polyols

Author

Bonilla, Marjune Tamayo, primary, Ruda, Archie Gomera, additional, Estrada, Dave Joseph E., additional, Ubas, Kurt Sterling M., additional, Mutia, Aaron Andrew B., additional, Lubguban, Arnold A., additional, Capangpangan, Rey Y., additional, Labis, Joselito P., additional, Tilendo, Amierson C., additional, Sayson, Noel Lito B., additional, and Alguno, Arnold C., additional

Published
2023
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32. Experimental Design and Breakthrough Curve Modeling of Fixed-Bed Columns Utilizing a Novel 3D Coconut-Based Polyurethane-Activated Carbon Composite Adsorbent for Lead Sequestration

Author

Fernandez, Rubie Mae D., primary, Estrada, Renz John R., additional, Tomon, Tomas Ralph B., additional, Dingcong, Roger G., additional, Amparado, Ruben F., additional, Capangpangan, Rey Y., additional, Malaluan, Roberto M., additional, Dumancas, Gerard G., additional, Lubguban, Alona A., additional, Alguno, Arnold C., additional, Bacosa, Hernando P., additional, and Lubguban, Arnold A., additional

Published
2023
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33. Removal of Pb2+ from Aqueous Media by Adsorption onto a Novel Coconut-Based Polyurethane-Activated Carbon Composite in a Fixed-Bed Column: Experimental Design and Breakthrough Curves Modelling

Author

Fernandez, Rubie Mae D., primary, Estrada, Renz John R., additional, Tomon, Tomas Ralph B., additional, Dingcong, Roger Jr. G., additional, Amparado Jr., Ruben F., additional, Capangpangan, Rey Y., additional, Malaluan, Roberto M., additional, Dumancas, Gerard G., additional, Lubguban, Alona A., additional, Alguno, Arnold C., additional, Bacosa, Hernando P., additional, and Lubguban, Arnold A., additional

Published
2023
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35. Production of Bio-Based Polyol from Coconut Fatty Acid Distillate (CFAD) and Crude Glycerol for Rigid Polyurethane Foam Applications

Author

Salcedo, Ma. Louella D., primary, Omisol, Christine Joy M., additional, Maputi, Anthony O., additional, Estrada, Dave Joseph E., additional, Aguinid, Blessy Joy M., additional, Asequia, Dan Michael A., additional, Erjeno, Daisy Jane D., additional, Apostol, Glenn, additional, Siy, Henry, additional, Malaluan, Roberto M., additional, Alguno, Arnold C., additional, Dumancas, Gerard G., additional, and Lubguban, Arnold A., additional

Published
2023
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37. Characterization and Application of Rice Straw-Based Polyurethane Foam Blocks for Soil Erosion Control.

Author

Maravillas, Felrose P., Omisol, Christine Joy M., Abilay, Gerson Y., Lasquite, Nicholas L., Aguinid, Blessy Joy M., Estrada, Dave Joseph E., Ruda-Bayor, Rosal Jane, Cea, Evalyn Joy C., Cavero, Applegen I., Ahalajal, Mary Ann N., Lorenzo, Glen A., Malaluan, Roberto M., Dumancas, Gerard G., and Lubguban, Arnold A.

Abstract

Soil erosion, a global problem, degrades land quality and increases pollution and sedimentation in bodies of water. This study propounds a new material to mitigate soil erosion using rice straw-based polyurethane foam (RSPF) blocks as a potential replacement for commercially available expanded polystyrene (EPS) foam in slope stabilization. RSPF was synthesized via a conventional one-shot foaming method with 15% rice straw-based polyol content. The RSPF blocks have an average density of 43.29 kg/m3, average compressive strength of 184.55 kPa, closed cell content of 88.4%, and water absorption capacity of 262% that can effectively reduce water runoff. These properties are comparable to EPS foams according to ASTM D6817, except for the high absorption capacity of RSPF. This added feature allows the foam to act as topsoil protection by reducing runoff. In slope stabilization and topsoil protection applications, the effectiveness of the RSPF blocks in reducing soil loss was tested in both simulated and natural rainfall events with different land slope degrees, rain intensities, and soil covers. Results show that the use of RSPF in the simulated setup with a heavy rain intensity of 80 mm/h reduced the soil loss by 61.5%, 22.7%, and 4.3% in 5°, 10°, and 20° of land slope, respectively. There was also a higher degree of soil loss reduction when the RSPF block was coupled with a natural vegetation soil cover by 79.6%, 70%, and 19.3% in 5°, 10°, and 20° land slopes, respectively. Moreover, in the natural rainfall events in an open field with a land slope of 20°, the recorded soil loss reduction reached 93.6–98.8% at an average rainfall intensity of 16.26 mm/h. Additionally, the relationship between soil loss and land slope was investigated to produce a best fit model that predicts the soil loss up to a 20° land slope. An interesting observation was made wherein the erosion rate increased using linear regression modeling in the simulated setup for bare soil (BS), soil with vegetation (SV), soil with RSPF (SF), and soil with RSPF and vegetation (FV), with high coefficient of determination (R2) values between 0.92 and 0.99. These findings suggest that the RSPF block is a promising alternative and sustainable material for EPS foams in mitigating soil erosion, especially under heavy rainfall conditions. [ABSTRACT FROM AUTHOR]

Published
2024
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39. In Silico Investigation of the Impact of Reaction Kinetics on the Physico-Mechanical Properties of Coconut-Oil-Based Rigid Polyurethane Foam

Author

Alfeche, Fortia Louise Adeliene M., primary, Dingcong, Roger G., additional, Mendija, Leanne Christie C., additional, Al-Moameri, Harith H., additional, Dumancas, Gerard G., additional, Lubguban, Alona A., additional, Malaluan, Roberto M., additional, Alguno, Arnold A., additional, and Lubguban, Arnold A., additional

Published
2023
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41. Synthesis and Characterization of AuNP/TiO2 Hybrid Nanoparticles for Possible Photocatalytic Application

Author

Dulog, Jay C., Unabia, Romnick, Delicana, Jared Deve P., Lalem, Aldrin, Sayson, Noel Lito B., Capangpangan, Rey Y., Lubguban, Arnold A., and Alguno, Arnold C.

Abstract

Nanoparticles have been intensively studied due to their unique, size-dependent properties, paving the way for various applications, particularly in photocatalysis. This study aims to determine the physicochemical characteristics of TiO2 and Au nanoparticles and the AuNP/TiO2 hybrid nanoparticles. Employing multiple characterization techniques, the structural and functional parameters were elucidated. The Brunauer-Emmett-Teller (BET) surface area analysis revealed the pore sizes of TiO2 and the Au/TiO2 hybrid nanoparticles as 12 nm and 18 nm, respectively. The Dynamic light scattering (DLS) measurements revealed the hydrodynamic size of the AuNP/TiO2 hybrid nanoparticles at 386 nm. The UV-visible spectroscopy showed the absorbance peaks associated with their electronic structures and potential photocatalytic applications. The fast Fourier infrared (FTIR) spectroscopy results revealed the surface molecular interactions crucial for nanoparticle functionalities. The AuNP/TiO2 hybrid nanoparticles exhibit a larger pore size compared to TiO2NPs, indicating their superior adsorption capability. Moreover, the unique band gap of TiO2NPs and electron-hole pair generation make it a formidable candidate for photocatalysis. The incorporation of AuNPs may further augment charge separation, optimizing photocatalytic activity. These findings spotlight the promise of these AuNP/TiO2 hybrid nanoparticles in possible photocatalytic applications.

Published
2024
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44. Coconut power: a sustainable approach for the removal of Cr6+ ions using a new coconut-based polyurethane foam/activated carbon composite in a fixed-bed column

Author

Tomon, Tomas Ralph B., primary, Estrada, Renz John R., additional, Fernandez, Rubie Mae D., additional, Capangpangan, Rey Y., additional, Lubguban, Alona A., additional, Dumancas, Gerard G., additional, Alguno, Arnold C., additional, Malaluan, Roberto M., additional, Bacosa, Hernando P., additional, and Lubguban, Arnold A., additional

Published
2023
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49. CeO2-dolomite as fire retardant additives on the conventional intumescent coating in steel substrate for improved performance

Author

Zoleta Joshua, Itao Gevelyn, Resabal Vannie Joy, Lubguban Arnold, Corpuz Ryan, Tabelin Carlito, Ito Mayumi, and Hiroyoshi Naoki

Subjects
Engineering (General). Civil engineering (General), TA1-2040
Abstract

Multiple combinations of CeO2-Dolomite as fillers and Intumescent Flame Retardant (IFR) ingredients were used to optimize the intumescent coatings designed for I-beam steel substrates. The influenced of fillers and various combinations of flame-retardants on the fire protective performance of the coatings were evaluated using vertical Bunsen burner fire test and various characterization techniques. Formula C and Formula F having 1:1 and 2:2 CeO2-Dolomite ratio, obtained the lowest substrate temperature around 150oC and 150.4oC, respectively after 90 minutes fire exposure. Also, the morphological structures of intumescent char observed by SEM-EDX, demonstrated that Formula C and Formula F stimulated the formation of homogeneous and more compacted surface structure. X-ray photoelectron spectroscopy (XPS) provide the binding energies of C and O constituents, it was observed that [-(C2H4)n-] was the most important free radical as it could promote the formation of aromatic carbon chain in the char surface. Finally, the findings of this study revealed that the selection of appropriate fillers and combinations of flame-retardant ingredients significantly influenced the morphological structure of the char layer, of which, Formula C and Formula F produced a char with higher thermal stability, resulting to a more fire resistive IFR coating during fire exposure.

Published
2019
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