中文关键词硫化纳米零价铁(S-nZVI@BFS)土霉素(OTC)高炉水渣(BFS)六价铬［Cr(Ⅵ)］复合污染 英文关键词sulfide nanoscale zero-valent iron(S-nZVI@BFS)oxytetracycline(OTC)blast furnace slag(BFS)hexavalent chromium［Cr(Ⅵ)］combined pollution

作者	单位	E-mail
孙秋楠	同济大学环境科学与工程学院, 污染控制与资源化研究重点实验室, 上海 200092	1930575@tongji.edu.cn
张荣斌	嘉兴市联合污水处理有限责任公司, 嘉兴 314001
邓曼君	同济大学环境科学与工程学院, 污染控制与资源化研究重点实验室, 上海 200092
李远	同济大学环境科学与工程学院, 污染控制与资源化研究重点实验室, 上海 200092
王学江	同济大学环境科学与工程学院, 污染控制与资源化研究重点实验室, 上海 200092	wangxj@tongji.edu.cn

中文摘要 利用液相还原法制备了一种高炉水渣负载硫化纳米零价铁（S-nZVI@BFS）材料，并将其用于废水中土霉素（OTC）的去除.本研究通过SEM、XRD和BET等手段分析了S-nZVI@BFS的表面结构特征，探讨了反应时间、OTC初始浓度、溶液初始pH和共存六价铬［Cr（Ⅵ）］等对其去除OTC的影响.结果表明，S-nZVI@BFS表面均匀负载了硫化纳米零价铁（S-nZVI），S-nZVI@BFS的比表面积和孔容分别为141.986 m²·g^-1和0.388 cm³·g^-1.S-nZVI@BFS表面活性点位的利用率随OTC初始浓度的增加而显著提高，当OTC初始浓度从10 mg·L^-1增加到100 mg·L^-1时，S-nZVI@BFS对OTC的去除量从20.12 mg·g^-1增加到202.74 mg·g^-1.S-nZVI的等电点为7.2，较低pH有利于S-nZVI@BFS对OTC的去除，当pH从3增加至11时，S-nZVI@BFS对OTC的去除量从99.78 mg·g^-1降低至41.12 mg·g^-1，降解机制由Fendon氧化和络合沉淀作用向静电吸附转移.Cr（Ⅵ）与OTC在S-nZVI@BFS去除体系中存在明显竞争关系，Cr（Ⅵ）对OTC的去除存在抑制作用，且浓度越高，抑制作用越显著. 英文摘要 Blast furnace slag loaded with sulfide nano zero valent iron (S-nZVI@BFS) was applied to remove oxytetracycline (OTC) from water. S-nZVI@BFS was synthesized via liquid reduction and characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), and Brunauer, Emmett and Teller (BET) theory. The effect of reaction time, initial concentration of OTC, initial pH, and coexisting hexavalent chromium[Cr(Ⅵ)] were investigated. The results show that Fe and S were successfully immobilized on the surface of S-nZVI@BFS, the specific surface area and pore volume of which increased to 141.986 m²·g^-1 and 0.388 cm³·g^-1, respectively, following the loading of nZVI and sulfurization. The utilization rate of the surface active sites of S-nZVI@BFS was improved with an increase of the initial concentration of OTC; the removal rate increased from 20.12 mg·g^-1 to 202.74 mg·g^-1 when the initial concentration of OTC was increased from 10 mg·L^-1 to 100 mg·L^-1. The removal rate decreased with pH, declining from 99.78 mg·g^-1 to 41.12 mg·g^-1 when pH was increased from 3 to 11 due to the switch from Fendon oxidation to electrostatic adsorption. There was notable competition between OTC and Cr(Ⅵ) meaning that Cr(Ⅵ) can inhibit the removal of OTC, which is dose dependent.

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