基于柠檬酸铁的Fe/C催化剂制备及其活化过二硫酸盐降解磺胺嘧啶的研究

杨佳妮; 赵保卫; 杨茂莺; 索进苗; 朱正钰; 邓爱琴

doi:10.13205/j.hjgc.202307016

基于柠檬酸铁的Fe/C催化剂制备及其活化过二硫酸盐降解磺胺嘧啶的研究

doi: 10.13205/j.hjgc.202307016

兰州交通大学环境与市政工程学院, 兰州 730070

基金项目:

国家自然科学基金"微塑料与重金属的相互作用及其影响黄土中重金属植物有效性的机制"（22166022）；兰州交通大学基础研究拔尖人才培养计划项目"微塑料影响土壤-蔬菜系统中抗生素抗性基因传播的机制（2022JC10）"

详细信息

作者简介:
杨佳妮(1998-),女,硕士研究生,主要研究方向为水处理高级氧化技术。1259747784@qq.com

通讯作者:
赵保卫(1968-),男,教授,主要研究方向为水污染控制技术。zhbw2001@sina.cn

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出版历程
- 收稿日期: 2022-10-28

PREPARATION OF Fe/C CATALYST BASED ON FERRIC CITRATE AND ITS ACTIVATION PERFORMANCE ON PEROXYDISULFATE TO DEGRADE SULFADIAZINE

School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China

摘要

摘要: 针对Fe/C催化剂在催化过硫酸盐领域存在制备原料多、成本高、过程复杂等问题，以价廉环保的柠檬酸铁为原料，采用高温碳化法在不同热解温度（700，800，900，1000℃）下制备了4种Fe/C催化剂。通过SEM、EDS、BET、XRD、XPS对其进行表征，并将4种Fe/C催化剂用于吸附和活化过二硫酸盐（PDS）降解磺胺嘧啶（SDZ）。初步筛选后，以800℃下所得催化剂Fe/C-800作为目标催化剂进行深入研究，分析其活化PDS降解SDZ的性能及作用机理。结果表明：0.05 g/L的Fe/C-800在PDS投加量为1 mmol/L、溶液初始pH值为7时，SDZ （10 mg/L）的降解率可达98.8%；Fe/C-800具有较广的pH值适用范围，在低催化剂投加量下可高效降解不同浓度SDZ，且重复利用性能良好；Fe⁰和C可促进Fe³⁺转化为Fe²⁺，反应结束后铁/亚铁离子溶出量低（0.3182 mg/L）；反应体系中自由基途径和非自由基途径均存在，其中SO₄^-·、O₂^-·和¹O₂占主导作用，共同作用于SDZ的降解过程。研究结果可为Fe/C非均相催化剂活化PDS降解有机污染物提供新思路。
- 柠檬酸铁 /
- 高温碳化法 /
- 过二硫酸盐 /
- 催化降解 /
- 磺胺嘧啶
Abstract: In response to the current situation that various raw materials, high costs and complicated process in the preparation of Fe/C catalysts to activate persulfates, four Fe/C catalysts were prepared by a high-temperature carbonization method at different pyrolysis temperatures (700, 800, 900 and 1000℃) using inexpensive and environmentally friendly ferric citrate as raw material, and then characterized by SEM, EDS, BET, XRD, XPS. Four Fe/C catalysts were used for the adsorption and activation of peroxydisulfate (PDS) for the degradation of sulfadiazine (SDZ). After initial screening, Fe/C-800 catalyst obtained at 800℃ was used as the target catalyst for an in-depth study. The performance of its activation of PDS to degrade SDZ and the mechanism of action were analyzed. The results showed that the degradation rate of 98.8% can be achieved for 10 mg/L SDZ by 0.05 g/L Fe/C-800 and 1 mmol/L PDS. The Fe/C-800 catalyst had a wide range of pH, could achieve the efficient degradation of different concentrations of SDZ even at a low dosing rate, and demonstrated good recycling performance. Fe⁰ and C could promote the conversion of Fe³⁺ into Fe²⁺, and the amount of ferri & ferrous iron ions dissolved at the end of the reaction was as low as 0.3182 mg/L. Both free radical and non-free radical pathways existed in the reaction system, in which SO₄^-·, O₂^-·, and ¹O₂ played the dominant roles in the degradation process of SDZ. The study may provide new ideas for the activation of Fe/C non-homogeneous catalysts to degrade organic pollutants by PDS.
- ferric citrate /
- high temperature carbonation method /
- peroxydisulfate /
- catalytic degradation /
- sulfadiazine

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