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Title: Controllable mullite bismuth ferrite micro/nanostructures with multifarious catalytic activities for switchable/hybrid catalytic degradation processes
Authors: Hu, Zhong-Ting
Oh, Wen-Da
Liu, Yiquan
Yang, En-Hua
Lim, Teik-Thye
Keywords: Engineering::Civil engineering
Issue Date: 2018
Source: Hu, Z.-T., Oh, W.-D., Liu, Y., Yang, E.-H., & Lim, T.-T. (2018). Controllable mullite bismuth ferrite micro/nanostructures with multifarious catalytic activities for switchable/hybrid catalytic degradation processes. Journal of colloid and interface science, 509, 502-514. doi:10.1016/j.jcis.2017.09.035
Journal: Journal of colloid and interface science
Abstract: In this work, controllable preparation of micro/nanostructured bismuth ferrites (BFOs) were used to investigate multifarious heterogeneous catalyses, including Fenton/Fenton-like reaction, photocatalysis, photo-Fenton oxidation, and peroxymonosulfate (PMS) activation. Results showed that BFO can be used asa novel catalyst to activate switchable catalytic degradation of organic matters. Additionally, a novel catalytic system for degradation of organic pollutants, which integrating all-above heterogeneous catalyses is denoted as BFO/H2O2/PMS hybrid reaction, is introduced for the first time. BFO/H2O2/PMS system effectively degraded>99% for both methyl orange (MO) and sulfamethoxazole (SMX) within 60min, which shows better efficiency than above BFO-driven catalyses. The major SMX degradation pathway in BFO/H2O2/PMS system is proposed via detecting intermediates using LC/MS/MS. It was found that catalytic activities of BFOs are in the order of BFO-L (co-precipitation, micro/nanosize, single crystals exposing facet (001))>BFO-H (hydrothermal, nanocluster with a higher surface area than other BFOs)>BFO-C (fabricated using calcination process, microsize), which demonstrated that crystallographic orientation is more significant in heterogeneous catalyses than specific surface area at micro/nanoscale. Besides, the required H2O2 consumption for achieving 99% TOC removal was identified in BFO-driven photo-Fenton oxidation. The other effects on degradation efficiency, such as H2O2 dosage and pH, were investigated as well. In Fenton/Fenton-like reaction, reaction conditions suggested are ∼61.5mM H2O2 dosage and pH≥4.5 to avoid quenching of HO into HO2 by excessive H2O2 and Fe leaching.
ISSN: 0021-9797
DOI: 10.1016/j.jcis.2017.09.035
Rights: © 2017 Elsevier Inc. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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