• 关键词：有机蒙脱石  负载型纳米铁  4-氯酚  吸附  还原

• 基金项目：水体污染控制与治理国家重大科技专项(No.2008ZX07211-004)

• 刘凯
• 1. 湖南大学环境科学与工程学院,长沙 410082;
  2. 环境生物与控制教育部重点实验室(湖南大学),长沙 410082

• 庞志华
• 环境保护部华南环境科学研究所,广州 510655

• 李小明
• 1. 湖南大学环境科学与工程学院,长沙 410082;
  2. 环境生物与控制教育部重点实验室(湖南大学),长沙 410082;
  3. 广西大学环境学院,南宁 530004

• 谌建宇
• 环境保护部华南环境科学研究所,广州 510655

• 罗隽
• 环境保护部华南环境科学研究所,广州 510655

• 摘要：采用离子交换法制备了有机改性蒙脱石(CMt),以此为载体和分散剂,通过液相还原过程成功制备出负载型纳米零价铁颗粒(NZVI-CMt),并对其结构利用XRD、SEM等手段进行表征.同时,借助高效液相色谱法(HPLC)分析研究了不同条件下合成材料对4-氯酚(4-CP)的去除情况,并对降解机理进行了探讨.结果表明:制备出的负载型纳米零价铁颗粒分散性良好,粒径在1~100 nm范围内;25 ℃条件下,30 min内NZVI-CMt对初始浓度为10 mg·L^-1的4-CP可达到90%的去除效果,合成材料能应对不同浓度4-CP的冲击并保持优良的去除率;NZVI-CMt对4-氯酚的去除作用包括吸附和降解两种途径,温度对去除途径的选择有明显影响;NZVI-CMt对4-CP的优良吸附性有利于Fe⁰的传质,进而增强了4-CP的降解效果.

• Abstract：Organomontmorillonite (CMt) prepared by ion exchange method was used as carrier and dispering agent for synthesizing Nanoscale zero-valent iron (NZVI), by adopting aqueous reducing technique. The NZVI (NZVI-CMt) was characterized by XRD and SEM. The removal rate of 4-chlorophenol by NZVI-CMt was investigated under different conditions. In addition, the degradation mechanism of 4-chlorophenol was discussed. The experimental results demonstrated that the supported NZVI was well-dispersed, with a particle size range of 1~100 nm. When the initial concentration of 4-chlorophenol was 10 mg·L^-1, the removal rate by NZVI-CMt reached 90% after 30 min under 25 ℃. In addition, the NZVI-CMt performed good removal efficiency as the 4-CPs concentration varied. In this process 4-CPs were removed by two pathways, adsorption and degradation. Temperature was an important factor influencing the removal pathway. With excellent absorbability, NZVI-CMt enhanced the effect of 4-CPs degradation by raising the efficiency of mass transmission of Fe⁰.

• Key words：organomontmorillonite  supported nanoscale zero-valent iron  4-CP  adsorption  degradation

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