Highly Efficient Degradation of Tetracycline Hydrochloride in Water by Oxygenation of Carboxymethyl Cellulose-Stabilized FeS Nanofluids

Hong Xiao (), Yingjun Wang, Hong Peng, Ying Zhu, Dexin Fang, Ganxue Wu, Li Li and Zhenxing Zeng ()
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Hong Xiao: College of Environmental Sciences, Sichuan Agriculture University, Chengdu 611130, China
Yingjun Wang: College of Environmental Sciences, Sichuan Agriculture University, Chengdu 611130, China
Hong Peng: College of Environmental Sciences, Sichuan Agriculture University, Chengdu 611130, China
Ying Zhu: College of Environmental Sciences, Sichuan Agriculture University, Chengdu 611130, China
Dexin Fang: College of Environmental Sciences, Sichuan Agriculture University, Chengdu 611130, China
Ganxue Wu: College of Environmental Sciences, Sichuan Agriculture University, Chengdu 611130, China
Li Li: College of Environmental Sciences, Sichuan Agriculture University, Chengdu 611130, China
Zhenxing Zeng: College of Environmental Sciences, Sichuan Agriculture University, Chengdu 611130, China

IJERPH, 2022, vol. 19, issue 18, 1-16

Abstract: The transformation of organic pollutants by stabilized nano-FeS in oxic conditions is far less understood than in anoxic states. Herein, carboxymethyl cellulose-stabilized FeS (CMC-FeS) nanofluids are prepared at a CMC-to-FeS mass ratio of 1/2 and their performance of tetracycline hydrochloride (TC) degradation under oxic conditions was investigated. Here, we showed that TC could be efficiently removed by oxygenation of CMC-FeS nanofluids at neutral initial pH. We found that CMC-FeS dosages as low as 15 mg/L can achieve the TC removal efficiency as high as 99.1% at an initial TC concentration of 50 mg/L. Oxidative degradation plays a predominated role in TC removal (accounting for 58.0%), adsorption has the second importance (accounting for 37.0%), and reduction has minor impact (accounting for 4.1%) toward TC removal. Electron spin resonance assays, fluorescent detection using coumarin as a probe, and radical scavenging experiments confirm that hydroxy radicals (•OH), both in free and surface-bound forms, contribute to oxidation of TC. Humic acids brought detrimental effects on TC removal and therefore should be biologically degraded in advance. This work offers a facile and cost-effective solution to decontaminate TC in natural and engineered water bodies.

Keywords: tetracycline hydrochloride; CMC-FeS nanofluid; oxygenation; hydroxy radicals (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
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