Simultaneous removal of chromium(VI) and tetracycline hydrochloride from simulated wastewater by nanoscale zero-valent iron/copper–activated persulfate

In this paper, metallic copper (Cu) was supported on nanoscale zero-valent iron (nZVI) to form a nanoscale bimetallic composite (nZVI-Cu), which was used to activate persulfate (PS) to simultaneously remove the compound contaminants Cr(VI) and tetracycline hydrochloride (TCH) in simulated wastewater...

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Bibliographic Details
Published in:Environmental science and pollution research international 2020-11, Vol.27 (32), p.40826-40836
Main Authors: Qu, Guangzhou, Chu, Rongjie, Wang, Hui, Wang, Tiecheng, Zhang, Zengqiang, Qiang, Hong, Liang, Dongli, Hu, Shibin
Format: Article
Language:English
Subjects:
Acidic oxides
Adsorption
Antibiotics
Aquatic Pollution
Atmospheric Protection/Air Quality Control/Air Pollution
Bimetals
Chromium
Contaminants
Copper
Degradation
Earth and Environmental Science
Ecotoxicology
Efficiency
Electrolytic cells
Environment
Environmental Chemistry
Environmental Health
Environmental science
Experiments
Free radicals
Galvanic corrosion
Iron
Metals
Nitrates
Oxidation
Pollutants
Research Article
Waste Water Technology
Wastewater
Water Management
Water Pollution Control
X ray photoelectron spectroscopy
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Summary:In this paper, metallic copper (Cu) was supported on nanoscale zero-valent iron (nZVI) to form a nanoscale bimetallic composite (nZVI-Cu), which was used to activate persulfate (PS) to simultaneously remove the compound contaminants Cr(VI) and tetracycline hydrochloride (TCH) in simulated wastewater. nZVI, nZVI-Cu, and nZVI-Cu-activated PS (nZVI-Cu/PS) were characterized by SEM, TEM, XRD, and XPS. The effects of the bimetallic composite on Cr(VI) and TCH removal were compared in the nZVI, nZVI-activated PS (nZVI/PS), nZVI-Cu, and nZVI-Cu/PS systems. The results showed that nZVI and Cu can form a nanobimetallic system, which can create galvanic cells; thus, the galvanic corrosion of nZVI and the transfer of electrons are accelerated. For a single contaminant, the removal efficiency of Cr(VI) and TCH is the highest when nZVI is loaded with 3 wt% and 1 wt% Cu, respectively. The ratio of nZVI-Cu with 3 wt% Cu to PS is 7:1, and the removal efficiency of Cr(VI) and TCH compound contaminants is ~ 100% after 60 min under acidic conditions, which indicates that the Cr(VI) reduction and TCH oxidation were complete in the nZVI-Cu/PS system. The mechanisms of simultaneous removal of Cr(VI) and TCH in the nZVI-Cu/PS system are proposed. The removal of Cr is because of the adsorption-reduction effects of the nZVI-Cu bimetallic material. The degradation of TCH is mainly due to the action of oxidative free radicals generated by Fe 2+ -activated PS. The free radical capture experiments showed that SO- 4· plays a major role in the process of TCH degradation.
ISSN:0944-1344
1614-7499
DOI:10.1007/s11356-020-10120-8