Facile synthesis of Cr-doped ferrite catalyst from Cr-containing electroplating sludge with activated persulfate for efficient degradation of tetracycline. Issue 6 (December 2022)

• Record Type: Journal Article
• Authors: Xie, Dongsheng; Chu, Shasha; Zhang, Shihua; Ivanets, Andrei; Zhang, Lijuan; Su, Xintai
• Is Part Of: Journal of environmental chemical engineering. Volume 10:Issue 6(2022)
• Publication Date: 2022-12
• Subjects: Electroplating sludge -- Chromium -- Immobilization -- Advanced oxidation processes -- Tetracycline degradation; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2022.108805
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: Electroplating sludge (ES) is a typical industrial hazardous waste, which contains multitudes of valuable transition metal resources. Hence, there is an urgent need for a method which can not only effectively detoxify, but also reasonably reuse ES resources. In this work, we synthesized Cr-doped ferrite catalyst (HT-ES) derived from Cr-containing ES v ia hydrothermal treatment, and applied it for the degradation of tetracycline (TCH). After hydrothermal treatment, the HT-ES with double metal oxide structure and large specific surface area (168.3 m 2 g −1 ) was obtained. The removal percentage of TCH could reach 90.79%, under the optimum conditions derived by response surface methodology. Experimental results demonstrated that HT-ES also exhibited high resistance to water impurities (i.e., Cl -, HCO3 -, NO3 and humic acid) and perfect reusability. The electron spin resonance and radical quenching experiments revealed that SO - 4, OH and O - 2 radicals appeared in the TCH degradation reaction system. Finally, a probable degradation mechanism of TCH was proposed based on the experimental results. This work not only achieved the stabilization of Cr-containing ES, but also obtained an excellent catalyst for the removal of TCH, realizing the goal of treating waste with waste. Highlights: Cr-doped ferrite catalyst was synthesized from Cr-containing electroplating sludge. The catalyst could activate persulfate to efficiently degrade tetracycline. Free radicals and the structure of catalyst promote persulfate activation. Cr-doped ferrite exhibits excellent stability and reusability.