• 张学良,徐建,占新华,孙成,林玉锁.微波辅助合成γ-Fe2O3/花生壳磁性生物炭对水体中环丙沙星吸附的研究[J].环境科学学报,2019,39(11):3811-3820

  • 微波辅助合成γ-Fe2O3/花生壳磁性生物炭对水体中环丙沙星吸附的研究
  • Adsorption of ciprofloxacin on magnetic γ-Fe2O3/peanut shell biochar prepared by microwave-assisted synthesis method
  • 基金项目:中央级公益性科研院所基本科研业务专项;国家自然科学基金(No.51578279,21777067)
  • 作者
  • 单位
  • 张学良
  • 1. 南京农业大学资源与环境科学学院, 南京 210095;2. 生态环境部南京环境科学研究所, 南京 210042;3. 国家环境保护土壤环境管理与污染控制重点实验室, 南京 210042
  • 徐建
  • 1. 生态环境部南京环境科学研究所, 南京 210042;2. 国家环境保护土壤环境管理与污染控制重点实验室, 南京 210042;3. 南京大学环境学院, 南京 210023
  • 占新华
  • 南京农业大学资源与环境科学学院, 南京 210095
  • 孙成
  • 南京大学环境学院, 南京 210023
  • 林玉锁
  • 1. 生态环境部南京环境科学研究所, 南京 210042;2. 国家环境保护土壤环境管理与污染控制重点实验室, 南京 210042
  • 摘要:基于化学共沉淀法,利用微波辅助成功合成了γ-Fe2O3/花生壳磁性生物炭复合材料.结果表明,微波辅助合成扩大了生物炭的比表面积和孔隙体积,提高了生物炭表面γ-Fe2O3颗粒的分散度.此外,微波效应使得γ-Fe2O3牢固地附着在生物炭表面并提高了吸附剂的磁性.在最佳pH=6.0的条件下,微波辅助合成的磁性生物炭对环丙沙星(CIP)的吸附量为8.30 mg·g-1,吸附量高于传统法制备的吸附剂(4.50 mg·g-1).吸附过程受多重机制控制,5次循环实验证实由微波辅助合成的γ-Fe2O3/花生壳磁性生物炭纳米复合材料是一种高效、稳定、可重复使用的吸附剂.微波辅助合成给磁性生物炭优化提供了新思路,为提高吸附剂对有机污染物的有效去除提供了新的途径.
  • Abstract:The magnetic γ-Fe2O3/peanut shell biochar nano-composite material was prepared successfully via microwave-assisted synthesis based on traditional chemical co-precipitation. Microwave-assisted synthesis enlarged the specific area and pore volume of biochar and promoted the dispersion of γ-Fe2O3 particles on the biochar surface. In addition, microwave effect made γ-Fe2O3 particles adhere to the biochar surface firmly and enhanced the magnetism of adsorbent. At the optimum pH 6.0, the adsorption capacity of ciprofloxacin (CIP) was 8.30 mg·g-1, which was higher than that (4.50 mg·g-1) prepared by traditional chemical co-precipitation. The adsorption process was controlled by multiple mechanisms. The five recycling experiments confirmed that γ-Fe2O3/peanut shell biochar nano-composite material prepared by microwave irradiation was a highly efficient, stable and reusable adsorbent for the removal of CIP from aquatic solution. Microwave-assisted synthesis provides not only novel insights into the optimization of magnetic biochar, but also a new approach to improve the absorbent for removing organic contaminants effectively.

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