Removal of Azo Dyes Reactive Brilliant Red X-3B by Zero-Valent Iron Enhanced by a Weak Magnetic Field: Efficiency and Mechanism
Publication: Journal of Environmental Engineering
Volume 146, Issue 10
Abstract
The removal kinetics and mechanism of azo dye Reactive Brilliant Red X-3B (X-3B) by a weak magnetic field (WMF)–enhanced zero-valent iron (ZVI) were explored. The results show that the reaction rate of zero-valent iron removal of X-3B was greatly enhanced by the weak magnetic field, and the removal rate increased with the decreasing of pH and initial dye concentration, and increased with the increasing temperature and ZVI dosage. The effect of common coexisting ions was also studied. In the presence of a magnetic field, , , and had certain inhibitory effects on the reaction, while anions , , , , , and could significantly promote the removal of dye. In contrast, all kinds of anions and cations could promote the reaction without a magnetic field. Expect these, the degradation process was consistent with the pseudo-first-order kinetic model by fitting the experimental data. The activation energy ware in the presence of WMF and in the absence of WMF by using the Arrhenius formula. The degradation process was further analyzed by ultraviolet–visible (UV-Vis) spectroscopy, scanning electron microscopy (SEM), and X-ray diffraction (XRD). The main mechanism of this reaction involves free radical oxidation, and the main reaction products were lepidocrocite and .
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Data Availability Statement
All data, models, and code generated or used during the study are available from the corresponding author by request.
Acknowledgments
This work was supported by the he National Natural Science Foundation of China under Grant 41807468, Zhejiang Provincial Natural Science Foundation of China under Grant LY18E080018, Shaoxing Public Welfare Project under Grant 2017B70042, National Innovation and Entrepreneurship Training Program for College Students under Grant 201810349008, University Students’ Science and Technology Innovation Program of Zhejiang Province (Young Talents Program) under Grant 2018R432004, and State Key Laboratory of Pollution Control and Resource Reuse Foundation under Grant PCRRF18021.
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Published In
Journal of Environmental Engineering
Volume 146 • Issue 10 • October 2020
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©2020 American Society of Civil Engineers.
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Received: Dec 17, 2019
Accepted: Mar 31, 2020
Published online: Jul 21, 2020
Published in print: Oct 1, 2020
Discussion open until: Dec 21, 2020
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