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金霉素、四环素和土霉素等是常用兽用抗生素,随着家畜排泄物堆肥的使用,3种抗生素进入到环境中成为新兴的污染物。本文采用一锅法,以葡萄糖为还原剂,制备了自组装的Fe_3O4纳米颗粒与还原氧化石墨烯的纳米复合材料(Fe_3O4@rGO),采用平衡吸附法研究了Fe_3O4@rGO对3种抗生素的吸附性能和行为。表征结果显示,Fe_3O4@rGO具有两种前驱体的特征,Fe_3O4纳米颗粒均匀分散在rGO表面上。吸附结果表明,Fe_3O4@rGO对3种抗生素的吸附速率很快,20min基本达到吸附平衡;当溶液pH值在4～8时,pH值对3种抗生素的吸附容量没有显著性的影响;Fe_3O4@rGO对3种抗生素的吸附容量均大于单纯的Fe_3O4和rGO;Fe_3O4@rGO对金霉素(189.2mg/g)和四环素(199.7mg/g)有较高的吸附容量,而对土霉素(112.5mg/g)的吸附容量相对较低,这是由于土霉素与Fe_3O4和rGO的结合力均相对较弱造成的;3种抗生素在Fe_3O4@rGO上的吸附过程可用Langmuir等温吸附模型和准二级动力学方程来描述。
Abstract：Tetracycline(TC), oxytetracycline(OTC) and chlortetracycline(CTC) antibiotics as the veterinary drugs with widespread use can be exported to the environment through the manure application and have been classified as the emerging pollutants. A self-assemble nanocomposite of the nano-Fe_3O4 and the reduced graphene oxide(Fe_3O4@rGO) with D-glucose as the reductant was prepared by a one-pot method. The adsorption performances and behavior of 3 antibiotics onto the Fe_3O4@rGO were investigated using batch method. The results of characterization showed that there were the characteristic peaks of Fe_3O4 and rGO in the proposed nanocomposite and the nano-Fe_3O4 dispersed uniformly on the surface of rGO. The adsorptive results indicated that the adsorption equilibrium for 3 antibiotics was performed within 20 min with rapid rate. The high and stable adsorption amounts of 3 antibiotics were achieved in the p H range of 4～8. The adsorption capacities of the nanocomposite for 3 antibiotics were much higher than that of the pure nano-Fe_3O4 and rGO. The nanocomposite for CTC(189.2 mg/g) and TC(199.7 mg/g) had higher adsorption capacity than OTC(112.5 mg/g) due to the relatively weak binding force of OTC with Fe_3O4 and rGO. The Langmuir and Pseudo-second-order equations provided the best correlation for the adsorption process of 3 antibiotics onto the nanocomposite.
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基本信息:
DOI：10.16026/j.cnki.iea.2021010076
中图分类号:TQ424;TB332;X703
引用信息:
[1]王晓峰,张爽,刘俊竹,等.Fe_3O_4@还原氧化石墨烯纳米复合材料及其对四环素类抗生素的吸附研究[J].离子交换与吸附,2021,37(01):76-87.DOI:10.16026/j.cnki.iea.2021010076.
基金信息:
辽宁省科技厅博士启动基金指导计划项目(No.20170520285); 辽宁省教育厅青年项目(No.LQ2017004); 沈阳化工大学青年育苗项目(No.XXLQ2019005)
2021-02-20
2021-02-20