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Mohamad Azuwa Mohamed,M. F. M. Zain,Lorna Jeffery Minggu,Mohammad B. Kassim,Juhana Jaafar,Nor Aishah Saidina Amin,Mohd Sufri Mastuli,Hao Wu,Roong Jien Wong,Yun Hau Ng 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.77 No.-
The in-situ hierarchical heterojunction photocatalyst consists of C-doped g-C3N4 (CCN) grafted on the C, Nco-doped ZnO were successfully realized via simple bio-template hydrothermal approach. The resultantshierarchical heterojunction photocatalyst exhibited excellent UV to the near infrared absorptioncapability. The electrochemical analysis and photoluminescence spectroscopy revealed that thehierarchical heterojunction photocatalyst possessed excellent charge generation and separationefficiency. The resultant hierarchical heterojunction photocatalyst exhibited remarkable photocatalyticperformance in the photodegradation of bisphenol A and photocatalytic hydrogen evolution undersimulated solar irradiation. The enhancement of photocatalytic performance was mainly attributed tothe combined effect of hierarchical morphology, in-situ doping, and heterojunction formation.
Nor Azureen Mohamad Nor,Mohamad Azuwa Mohamed,Juhana Jaafar 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.116 No.-
The fuel cell application is an imperative energy conversion transformation with impressive potential forMalaysian future vitality. The relatively small market of fuel cell technology in Malaysia, causing considerabledevelopment in the domestic market, should be created to ensure a noteworthy contribution toMalaysia’s energy industry. Currently, the research towards advanced polymer electrolyte membranesthat can provide high proton conductivity and good durability is actively being studied. This articlereviews the promising properties of polyphenylsulfone (PPSU) polymer materials as proton exchangemembranes. This alternative polymer material would be best to replace the costly and counter the drawbacksof the perfluorinated membranes in fuel cell systems. Unfortunately, the interconnected hydrophilicchannels of PPSU polymers are not well developed as the Nafion membrane. Thus, the PPSU wasmodified by a sulfonation reaction to confer their protonic conduction properties. In addition, the modificationof the highly sulfonated PPSU by thermal crosslinking as a potential technique to improve themechanical and chemical durability of the PPSU was discussed. Further, the effect of mixing various additivesto develop the PPSU nanocomposite membrane on proton conductivity, physicochemical properties,mechanical properties and fuel cell performance are also discussed in this work.
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.
Muhazri Abd Mutalib,Farhana Aziz,Nur Aisyah Jamaludin,Norsyazwani Yahya,Ahmad Fauzi Ismail,Mohamad Azuwa Mohamed,Mohd Zamri Mohd Yusop,Wan Norharyati Wan Salleh,Juhana Jaafar,Norhaniza Yusof 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.2
Perovskite LaFeO3 photocatalyst prepared by using sol-gel glucose method was assembled on graphene oxide sheets to produce integrated photocatalyst-adsorbents (IPCA) and investigated as photocatalyst for the degradation of methylene blue under visible light irradiation. The prepared photocatalyst was characterized by FTIR, XRD, FESEM, BET specific surface area measurement, TEM/HRTEM and UV-Vis spectroscopy analysis. The FTIR, FESEM and TEM analysis has suggested that the photocatalyst LaFeO3 has been successfully embedded at the surface of the graphene oxide (GO) sheets due to a strong interaction between the photocatalyst and the adsorbents matrix. Methylene blue degradation shows that IPCA possesses higher photodegradation kinetics compared to bare LaFeO3 photocatalyst. The resultant photocatalyst also possesses magnetic properties which can overcome the difficulty in recollecting and removal of photocatalyst suspension in water after photocatalytic treatment.