CoFe2O4的制备及其活化过硫酸盐降解磺胺甲恶唑

The preparation of CoFe2O4 and peroxymonosulfate activation for the degradation of sulfamethoxazole

摘要:

采用简单的共沉淀法在不同煅烧温度下成功合成了一系列铁酸钴材料（CoFe2O4-X），通过SEM，XRD，BET，XPS等表征手段对其结构组成进行了分析，并将其用于活化过一硫酸盐（PMS）以降解磺胺甲恶唑（SMX）。考察了催化剂投加量、PMS用量、pH值和无机离子对SMX降解的影响。结果表明，550℃煅烧温度下获得的CoFe2O4-550具有最佳的催化性能，在最佳反应条件下，20 min内，SMX的降解率可高达95%，且TOC去除率可达80%。同时，CoFe2O4-550/PMS反应体系具有较广的pH适用范围（pH=5.00-9.00）。CoFe2O4-550催化剂可磁性回收，具有较好的稳定性和重复使用性。自由基淬灭实验表明，在该降解反应过程中产生了大量的SO4-?和?OH自由基，并提出了相应的催化降解机理。这项工作将为有效处理含有SMX化合物的废水提供一种新思路。

Abstract:

A series of cobalt ferrite materials (CoFe2O4-X) were successfully synthesized by a simple co-precipitation method at different calcination temperatures, and their structure and composition of the catalyst were analyzed by SEM, XRD, BET, XPS and other characterization methods. The obtained materials were used for activation Peroxymonosulfate (PMS) to degrade sulfamethoxazole (SMX). The effects of catalyst dosage, PMS dosage, pH value and inorganic ions on the degradation of SMX were investigated. The results showed that the CoFe2O4-550 obtained at 550℃ calcination temperature exhibited the best catalytic performance. Under the optimal reaction conditions, the degradation rate of SMX can reached to 95% within 20 min and the TOC removal rate was 80%. At the same time, the CoFe2O4-550/PMS reaction system exhibited excellent catalytic performance at a wide pH range (pH=5.00-9.00). The CoFe2O4-550 catalyst can be recovered by magnets, showing good stability and reusability. Free radical quenching experiments showed that a large amount of SO4-? and ?OH radicals were produced during the degradation reaction, and the corresponding catalytic degradation mechanism was proposed. This work will provide a new approach for the effective treatment of wastewater containing SMX compounds.