• 关键词：三油酸甘油酯  活性炭  吸附  持久性有机污染物  辛醇-水分配系数  饮用水

• 基金项目：国家自然科学基金(No.50578154,20337020);国家高技术研究发展计划(No.2005AA642020)

• 茹加
• 1. 中国科学院生态环境研究中心环境水质学国家重点实验室, 北京 100085; 2. 中国科学院研究生院, 北京 100039

• 刘会娟
• 中国科学院生态环境研究中心环境水质学国家重点实验室, 北京 100085

• 曲久辉
• 中国科学院生态环境研究中心环境水质学国家重点实验室, 北京 100085

• 代瑞华
• 中国科学院生态环境研究中心环境水质学国家重点实验室, 北京 100085

• 摘要：研制了一种新型类脂-活性炭复合吸附剂,研究了其对水中痕量持久性有机污染物——七氯和环氧七氯的吸附行为.实验结果表明,该新型复合吸附剂对七氯和环氧七氯有较强的吸附性能,反应48h后,对初始浓度为20μg·L^-1的七氯和环氧七氯的去除率分别为98.79%和98.08%;吸附等温线符合弗兰德里希模型;吸附动力学符合准二阶动力学模型.该复合吸附剂对亲脂性较强的七氯具有较快的初始吸附速率、较大的平衡吸附量和较高的去除率.相同实验条件下,类脂-活性炭复合吸附剂对七氯和环氧七氯的吸附速率和去除效果均优于传统吸附材料活性炭.

• Abstract：The adsorption behavior of two POPs, heptachlor and heptachlor epoxide, on a novel triolein-embedded composite adsorbent (CA-T) was investigated. Results showed that CA-T seemed to be a promising adsorbent for removing lipophilic heptachlor and heptachlor epoxide in trace amounts from aqueous solutions. After adsorption for 48 h, the removal rates of heptachlor and heptachlor epoxide were 98.79% and 98.08%, respectively. The adsorption isotherms accorded with Freundlich equation. Kinetic data fitted well to the pseudo-second-order reaction model. The adsorption rate, equilibrium adsorption capacity and removal efficiency of heptachlor on CA-T were higher than that of heptachlor epoxide, which might be attributed to the stronger hydrophobicity of heptachlor. Higher removal rates and lower residual concentrations were achieved in CA-T system comparing with granular activated carbon (GAC) under the same operation conditions.

• Key words：triolein  activated carbon  adsorption  persistent organic pollutants (POPs)  octanol-water partition coefficient (log K_ow)  drinking water

• 
  摘要点击次数： 2749 全文下载次数： 3256