Bifunctional erdite rods as an effective flocculant and catalyst in electro-Fenton systems
作者机构：Zhongkai University of Agriculture and Engineering Crude Oil Shipping and Marketing CompanyDagang Oilfield Company CNPC Supervision CompanyJilin Oilfield Company CNPC School of Environment Northeast Normal University Lversheng Environmental Technology Company
出 版 物：《Progress in Natural Science:Materials International》 (自然科学进展·国际材料(英文))
年 卷 期：2023年第33卷第4期
页 面：518-525页
核心收录：
学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0702[理学-物理学]
基 金：supported by the National Key Research and Development Program of China (No. 2019YFE0117900) the National Natural Science Foundation of China (No. 52370158 and 52070038) the Innovative Research Team Program of Jilin Province (No. 20210509043RQ)
主 题：Erdite rods p-Nitrophenol Fenton reaction Wastewater treatment Flocculant
摘 要：Erdite rods were massively produced via a one-step alkaline heating route with the complete recycling of waste waterwork sludge. The sludge was a mixture of Fe, Mn, Al, and Si, but only Fe-bearing substances were converted as erdite rods. The erdite rods had 100 nm diameter and 1-5 μm length, and was hydrolysed as Fe-SH-rich flocs in wastewater. Its hydrolysis became slow in the presence of electric field but accelerated by adding PMS. pNitrophenol was targeted as organic pollutant to determine the rods performance. The removal efficiency of pnitrophenol was 7.4% by adding erdite rods, but up to 44.6% with the addition of erdite/PMS, and then dramatically increased to 98.7% in the electro-PMS/erdite system. Given that the free Fe was less than 30 mg/L,the surface Fe of Fe-SH-rich flocs predominated the PMS activation, in which the surface Fe enriched in electronic field and then was involved in the redox reaction of PMS and then reduced by the adjacent S on flocs. This enabled the recycling of Fe3+/Fe2+to activate PMS at high level. Thus, the erdite rods showed high p-nitrophenol removal efficiency in the electro-Fenton system in comparison with the other reported reagents, e.g. ferrous sulphate,ferbam, pyrite and FeS.
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