北京大学学报自然科学版 ›› 2021, Vol. 57 ›› Issue (4): 765-772.DOI: 10.13209/j.0479-8023.2021.060

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城市剩余污泥基吸附剂对水中两种喹诺酮类抗生素的去除

陶虎春,  宫一玮, 张丽娟, 丁凌云, 张善发   

  1. 深圳市重金属污染控制与资源化重点实验室, 北京大学深圳研究生院环境与能源学院, 深圳 518055
  • 收稿日期:2020-06-02 修回日期:2020-06-17 出版日期:2021-07-20 发布日期:2021-07-20
  • 通讯作者: 陶虎春, E-mail: taohc(at)pkusz.edu.cn
  • 基金资助:
    国家自然科学基金(51679002, 51809004)和深圳市基础研究项目(JCYJ20180503182122539)资助

Removal of Two Quinolone Antibiotics from Aqueous Solution by the Municipal Sewage Sludge-Based Adsorbent

TAO Huchun, GONG Yiwei, ZHANG Lijuan, DING Lingyun, ZHANG Shanfa   

  1. Shenzhen Key Laboratory for Heavy Metal Remediation and Reclamation, School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055
  • Received:2020-06-02 Revised:2020-06-17 Online:2021-07-20 Published:2021-07-20
  • Contact: TAO Huchun, E-mail: taohc(at)pkusz.edu.cn

摘要:

以城市污水处理厂剩余污泥为原料, 通过HNO3活化、NaOH活化以及H2O2氧化改性制备吸附剂(sewage sludge-based adsorbent, SSA), 研究其对水中环丙沙星(CIP)和洛美沙星(LOM)的去除及影响因素。采用扫描电子显微镜和傅里叶红外转换光谱对吸附剂表面形貌及官能团进行表征, 采用控制变量静态吸附实验方法, 考察吸附剂投加量、温度、溶液pH和离子强度等因素对吸附剂去除两种抗生素的影响。结果表明: 实验条件下, 经过0.1 M HNO3活化后的改性吸附剂对两种抗生素的去除效果最好, 改性后吸附剂表面粗糙的结构可为抗生素的吸附提供更多的位点, 表面含氧官能团可以通过形成氢键增强对水中有机物的吸附。当抗生素浓度为10 mg/L时, 吸附剂对CIP和LOM的吸附量分别为8.95和7.28 mg/g, 最高去除率分别为90%和73%。吸附剂对CIP和LOM的吸附过程均符合准二级动力学方程, Langmuir等温方程能够很好地描述吸附剂 对两种抗生素的吸附行为, 主要为单分子层化学吸附。经5次循环使用后, 吸附剂对CIP和LOM的去除率仍可达84%和67%。研究结果可为抗生素污染控制提供一条经济有效的技术途径。

关键词: 城市污泥, 改性, 吸附, 抗生素

Abstract:

The municipal sewage sludge was used as an raw material to prepare the sewage sludge-based adsorbent (SSA) by HNO3 activation, NaOH activation and H2O2 oxidation modification. The removal of ciprofloxacin (CIP) and lomefloxacin (LOM) from aqueous solution and the influencing factors were studied. Scanning electron microscopy and Fourier transform infrared spectroscopy were used to characterize the microstructure and functional groups on the surface of SSA. The effects of adsorbent dosage, temperature, the initial pH of solution, the ionic strength and other factors on the removal of CIP and LOM by SSA were investigated. The results showed that the modified SSA activated by 0.1 M HNO3 was most effective for removal of CIP and LOM. The rough structure of the modified adsorbent could provide more sites for antibiotic adsorption, and the oxygen-containing functional groups were able to form hydrogen bonds to enhance the adsorption of organic matters in solution. When the antibiotic concentration was 10 mg/L, the adsorption capacity of CIP and LOM was 8.95 and 7.28 mg/g, and removal rates were 90% and 73%, respectively. The adsorption process of CIP and LOM on the modified SSA was in accordance with the pseudo-second-order model, and Langmuir isotherm equation could well describe the adsorption behavior of CIP and LON on the modified SSA, which proved that adsorption process was monolayer chemisorption. The adsorbent removed 84% CIP and 67% LOM after 5 cycles, thus providing an efficient and sustainable way of antibiotic removal. 

Key words: sewage sludge, modification, adsorption, antibiotics