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Mhonishya Krishnamoorthy,Mohamad Azuwa Mohamed,Noor Haida Mohd Kaus,Siti Fairus M. Yusoff 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.116 No.-
A hydrogel-based photocatalyst was employed to remove methylene blue (MB) and safranin dye effluentsfrom wastewater using a liquid natural rubber (LNR)-acrylic acid (AAc) based bismuth ferrite (BFO)hydrogel compound. Response Surface Methodology (RSM) was used in this research to optimize severalparameters for the synthesis of hydrogel compound and adsorptive-photodegradation process. Without apost-treatment separation phase, safranin and MB dye were able to maintain dye removal for up to sixand five cycles with 99% dye removal, respectively, explaining the hydrogel’s stability and adsorptive efficiency. Furthermore, MB and safranin dyes were adsorbed and photodegraded very rapidly under a xenonlamp compared to the dye removal efficacy at dark, proving BFO has aided in the photodegradation processadsorbs further the dye effluents in which the hydroxyl radical (·OH) and superoxide radical (·O2 – )species were responsible for the photocatalytic activity. It has been proposed that safranin and MB dyeeffluent adsorption matches the pseudo-second-order kinetic model and Freundlich isotherm model. Apositive entropy number, S, in thermodynamic analysis indicates that the reaction has become more random,boosting the system’s spontaneity. Meanwhile, it is found that adsorption rate of safranin is highlydependent on pH and is under the influence of inner sphere surface complexes. Thus, the synthesizedLNR-g-MaH/AAc-BFO hydrogel compound in this study has shown excellent performance in the removalof dye effluents for the wastewater treatment process with enhanced stability.
Emerging polymeric-based material with photocatalytic functionality for sustainable technologies
Nur Shamimie Nadzwin Hasnan,Mohamad Azuwa Mohamed,Nornastasha Azida Anuar,Muhamad Firdaus Abdul Sukur,Siti Fairus Mohd Yusoff,Wan Nur Aini Wan Mokhtar,Zul Adlan Mohd Hir,Norshahidatul Akmar Mohd Shoha 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.113 No.-
A variety of polymer-based photocatalysts for the highest photocatalytic activity through various modificationsand improvements such as doping, treatment with the oxidising or reducing agent, and integratinganother nanomaterial into the polymer photocatalysts composite are extensively studied. Furthermore, the most common issues on polymer-based photocatalysts, including wide band gap andhigh recombination rate of charge carriers, still need to be improved to yield high photocatalytic activity. Besides hydrogen evolution through the water splitting system, focus also has been paid to photocatalyticfor CO2 reduction, photodegradation of pollutants, photocatalytic chemical synthesis, and photocatalyticnitrogen fixation. This review attempts to reveal the secret of properties, issues, and enhancements, principallyin polymer photocatalysts, besides highlighting the reason for polymeric material as a critical nonmetal-based photocatalyst for various photocatalytic reactions, as well as conducting polymeric materialwith photocatalytic functionality.