Rapid Degradation of Carbon Tetrachloride by Microscale Ag/Fe Bimetallic Particles
Open Access
- 22 February 2021
- journal article
- research article
- Published by MDPI AG in International Journal of Environmental Research and Public Health
- Vol. 18 (4), 2124
- https://doi.org/10.3390/ijerph18042124
Abstract
Cost-effective zero valent iron (ZVI)-based bimetallic particles are a novel and promising technology for contaminant removal. The objective of this study was to evaluate the effectiveness of CCl4 removal from aqueous solution using microscale Ag/Fe bimetallic particles which were prepared by depositing Ag on millimeter-scale sponge ZVI particles. Kinetics of CCl4 degradation, the effect of Ag loading, the Ag/Fe dosage, initial solution pH, and humic acid on degradation efficiency were investigated. Ag deposited on ZVI promoted the CCl4 degradation efficiency and rate. The CCl4 degradation resulted from the indirect catalytic reduction of absorbed atomic hydrogen and the direct reduction on the ZVI surface. The CCl4 degradation by Ag/Fe particles was divided into slow reaction stage and accelerated reaction stage, and both stages were in accordance with the pseudo-first-order reaction kinetics. The degradation rate of CCl4 in the accelerated reaction stage was 2.29–5.57-fold faster than that in the slow reaction stage. The maximum degradation efficiency was obtained for 0.2 wt.% Ag loading. The degradation efficiency increased with increasing Ag/Fe dosage. The optimal pH for CCl4 degradation by Ag/Fe was about 6. The presence of humic acid had an adverse effect on CCl4 removal.Funding Information
- National Key Research and Development Project of China (2020YFC1806502)
This publication has 40 references indexed in Scilit:
- Remediation of soil contaminated with organic compounds by nanoscale zero-valent iron: A reviewScience of The Total Environment, 2020
- Mechanistic role of nitrate anion in TCE dechlorination by ball milled ZVI and sulfidated ZVI: Experimental investigation and theoretical analysisJournal of Hazardous Materials, 2020
- Zero-Valent Iron Nanoparticles for Soil and Groundwater RemediationInternational Journal of Environmental Research and Public Health, 2020
- Injection of Zerovalent Iron Gels for Aquifer Nanoremediation: Lab Experiments and ModelingWater, 2020
- From nZVI to SNCs: development of a better material for pollutant removal in waterEnvironmental Science and Pollution Research, 2018
- Hydroxyl radical generation by zero-valent iron/Cu (ZVI/Cu) bimetallic catalyst in wastewater treatment: Heterogeneous Fenton/Fenton-like reactions by Fenton reagents formed in-situ under oxic conditionsChemical Engineering Journal, 2018
- Role of oxidative stress in inactivation of Escherichia coli BW25113 by nanoscale zero-valent ironScience of The Total Environment, 2016
- Green stabilization of microscale iron particles using guar gum: Bulk rheology, sedimentation rate and enzymatic degradationJournal of Colloid and Interface Science, 2014
- Corrosion rate estimations of microscale zerovalent iron particles via direct hydrogen production measurementsJournal of Hazardous Materials, 2014
- Reactivity screening of microscale zerovalent irons and iron sulfides towards different CAHs under standardized experimental conditionsJournal of Hazardous Materials, 2013