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纳米Fe/Co合金类Fenton降解盐酸四环素及影响因素研究
李君超, 蒋进元
中国环境科学研究院工程设计中心
摘要:
本文使用液相还原法制备纳米Fe/Co合金,并类Fenton降解TCs,以研究纳米Fe/Co合金的类Fenton对有毒有害、难降解抗生素废水的催化性能及外在因素对其性能的影响。在类Fenton水处理中pH值、H2O2投加量和催化剂活性离子析出等因素与非均相类Fenton催化效果具有明显的相关性,通过对比试验确定纳米Fe/Co合金材料的类Fenton性能并使用单因素法研究pH值、H2O2投加量和初始盐酸四环素浓度对TCs降解效率的影响,分析降解过程Fe、Co的析出和反应前后催化剂表面积结构等变化与催化剂活性之间的关系。结果表明:在pH为7.0左右、5.0~9.0范围分别是纳米Fe/Co合金降解TCs的最佳pH、最佳pH降解范围、H2O2投加量超29.7mmol后其不再是限制类Fenton降解效率的主要因素,纳米Fe/Co合金对不同浓度TCs均具有高的类Fenton去除效率而且浓度越低去除效率越高;即使在酸性条件下合金也呈现出非常低的Fe、Co析出量(<1.0 mg/L)满足我国《地表水环境质量标准》(GB 3838?—2002)。同时研究显示,使用液相还原法可以制备大比表面积的纳米Fe/Co合金非均相类Fenton催化剂且在较宽的pH范围能够对以TCs为代表的难处理抗生素废水具有良好的降解效果,催化剂主要成分Fe、Co良好稳定性能使出水中金属离子浓度满足我国水排放标准且具有可回收再利用能力。
关键词:  类芬顿  纳米 Fe/Co双金属  盐酸四环素
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基金项目:辽河等流域水体污染减排技术验证评估(ETV)与应用示范课题(No.2014ZX07504003);中国环境科学研究院中央级公益性科研院所基本科研业务专项(No.2015YSKY008)
Oxidative Degradation of Tetracycline Hydrochloride using Nano Fe/Co alloy and H2O2 under Fenton Conditions
LI Junchao, JIANG Jinyuan
Research Center of Environmental Engineering Design,Chinese Research Academy of Environmental Sciences
Abstract:
A liquid phase reduction method has been used to prepare nano Fe/Co alloy with a large surface area for use as a Fenton-like catalyst for the oxidative degradation of tetracycline hydrochloride in waste water. The catalytic properties of these Fe/Co nanocomposites were determined using comparative tests, with the effects of pH, H2O2 and substrate concentration on the rate of degradation of tetracycline hydrochloride determined using a single factor method. These results showed that the catalyst was active between a pH range of 5.0-9.0, with an optimum pH value of 7.0 for degradation of tetracycline hydrochloride. The concentration of H2O2 was found to be rate determining below 29.7 mmol, with the catalyst showing high Fenton-like efficiency for the oxidative degradation of relatively low concentrations of tetracycline hydrochloride. The Fe/Co catalyst displayed good stability which enables it to be recycled and meets environmental water discharge standards for deposition of Fe/Co ions into water effluent (<1.0 mg / L), even under acidic conditions.
Key words:  like-Fenton  nano Fe/Co  alloy Tetracycline  Hydrochloride