Adsorption and degradation of norfloxacin by a novel molecular imprinting magnetic Fenton-like catalyst

doi:10.1016/j.cjche.2015.08.030

Abstract

Abstract: In this study, a novel magnetically separable adsorbent, molecular imprinting magnetic γ-Fe₂O₃/crosslinked chitosan composites (MIPs), were prepared by a microemulsion process. Adsorption and Fenton-like oxidative degradation of a model pharmaceutical pollutant norfloxacin (NOR) by using MIPs were investigated. Various characterization methodswere used to study the properties ofMIPs, and it is suggested that the hydroxyl groups are the main adsorption sites for NOR. MIPs present better selective adsorption for NOR than its reference antibiotic sulfadiazine. The NOR adsorption data can be well fitted by Langmuir isotherm model and pseudosecond- order kinetic model. The optimum pH range for NOR adsorption is 7-10. In addition, the MIP-catalyzed Fenton-like system (MIPs/H₂O₂) exhibits remarkably faster removal rate for NOR than the case of γ-Fe₂O₃/ H₂O₂. The result indicates that MIPs will be a good functional material in decontamination of pharmaceutical wastewaters since MIPs can be magnetically recycled after the treatment.

Key words: Fenton-like, Norfloxacin, Molecular imprinting, &gamma, -Fe₂O₃, Adsorption

摘要： In this study, a novel magnetically separable adsorbent, molecular imprinting magnetic γ-Fe₂O₃/crosslinked chitosan composites (MIPs), were prepared by a microemulsion process. Adsorption and Fenton-like oxidative degradation of a model pharmaceutical pollutant norfloxacin (NOR) by using MIPs were investigated. Various characterization methodswere used to study the properties ofMIPs, and it is suggested that the hydroxyl groups are the main adsorption sites for NOR. MIPs present better selective adsorption for NOR than its reference antibiotic sulfadiazine. The NOR adsorption data can be well fitted by Langmuir isotherm model and pseudosecond- order kinetic model. The optimum pH range for NOR adsorption is 7-10. In addition, the MIP-catalyzed Fenton-like system (MIPs/H₂O₂) exhibits remarkably faster removal rate for NOR than the case of γ-Fe₂O₃/ H₂O₂. The result indicates that MIPs will be a good functional material in decontamination of pharmaceutical wastewaters since MIPs can be magnetically recycled after the treatment.

关键词: Fenton-like, Norfloxacin, Molecular imprinting, &gamma, -Fe₂O₃, Adsorption

Mingjie Huang, Tao Zhou, XiaohuiWu, Juan Mao. Adsorption and degradation of norfloxacin by a novel molecular imprinting magnetic Fenton-like catalyst[J]. , 2015, 23(10): 1698-1704.

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