Title: Nanoscaled Material Design: Bi2Fe4O9/Ag with Graphene-Wrapping Tribrid Composite with Superior Capability for Environmental Decontamination via Visible-Light-Driven Photo-Fenton Oxidation and Physical Adsorption
Name: Zhong-Ting Hu, Teik-Thye Lim
Nanyang Technological University, S639798, Singapore
Nanoscaled material design is an efficient method to improve the drawback of the pristine material or fabricate a multifunctional material combining their individual functions. As many investigations have proved that semiconductor/metal compositecan exhibit enhanced photocatalysis because of the plasmonic (enhance light harvesting) and electrical conduction (charge separation) properties of noble metal NPs. However, the efficiency of a photocatalyst is determined not only by the charge separation of photogenerated electron/hole pairs but also by that of the recombination effect. Herein, a novel ternary oxide (bismuth ferrite) is selected as the research subject and the corresponding cuboid-like Bi2Fe4O9/AgNP with graphene-wrapping tribrid nanoarchitecture was fabricated using a delicate multi-step synthesis process. It is designed to effectively enhance the performance of the pristine Bi2Fe4O9 in organic pollutants removal (up to 97% of methylene blue (MB) removal in 30 min under visible-light irradiation) through ternary collaboration among Bi2Fe4O9, silver nanoparticles (AgNPs) and reduced graphene oxide (rGO). The challenges, such as mass transfer of pollutants in water treatment, recombination of electrons/holes and interconversion between Fe(III) and Fe(II) states within Bi2Fe4O9, could be addressed effectively. The resulting samples (i.e., Bi2Fe4O9/Ag/rGO, Bi2Fe4O9/Ag and Bi2Fe4O9) were characterized by various techniques and their differences in physical and chemical properties were investigated. Meanwhile, their applications in organic pollutants removal were assessed via photo-Fenton oxidation and photocatalysis under visible-light irradiation. The findings demonstrate the individual functions of AgNP (i.e., electrical conduction, enhanced interconversion of Fe(III)/Fe(II)) and rGO (i.e., anti-recombination of electrons/holes, enhanced mass transfer of organic pollutants) within the Bi2Fe4O9/Ag/rGO composite. The schematic illustration of the mechanism of organic pollutants removal using the multi-functional Bi2Fe4O9/Ag/rGO is proposed.
Biography
Zhong-Ting (Justin) is a PhD student from Nanyang Technological University (Singapore). He holds BSc in Applied Chemistry and MSc in Environmental Engineering. He was a R&D researcher of NanoMaterials Technology Pte Ltd in Singapore (2007-2012). He has experiences in nanoparticle synthesis, surface modification, wet coating and nanomaterial production in pilot plant. He was a team leader of a research project for undergraduate students (chemical plating & H2 energy) and their paper won the 1st Prize of the 1st ZJNU Natural Science’s Academic Paper Competition. His current research interests are material and environment including advanced nanomaterials fabrication/optimization (morphology, self-assembly, nanocomposite, doping, synthesis), environmental photochemistry, heterogeneous catalysis, water treatment, solar energy, magnetic separation.
Presenting author details
Full name: Zhong-Ting Hu
Contact number: +65 9448 7566
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Category: (Oral presentation)