• 关键词：绿色合成  纳米铁  同时去除  苦丁茶  动力学

• 基金项目：福建省科技计划重点项目(No.2014Y0055);福建省教育厅资助项目(No.JA14080);福建出入境检验检疫局资助项目(No.FK2013-08)

• 曾慎亮
• 1. 福建师范大学化学与化工学院, 福州 350007;2. 莆田出入境检验检疫局, 莆田 351100

• 翁秀兰
• 福建师范大学环境科学与工程学院, 福州 350007

• 童玉贵
• 莆田出入境检验检疫局, 莆田 351100

• 林伟
• 莆田出入境检验检疫局, 莆田 351100

• 陈祖亮
• 1. 福建师范大学化学与化工学院, 福州 350007;2. 福建师范大学环境科学与工程学院, 福州 350007

• 摘要：植物提取液绿色合成纳米铁是用于环境修复最有潜力的技术之一.本文利用苦丁茶提取液绿色合成纳米铁(Fe NPs),考察了Fe NPs去除Pb(Ⅱ)和Cd(Ⅱ)的性能,同时,比较了不同温度对Fe NPs去除Pb(Ⅱ)和Cd(Ⅱ)的影响.结果表明,在pH=3.5、温度303 K、Fe NPs投加量为2.0 g·L^-1的条件下,反应60 min后,Pb(Ⅱ)和Cd(Ⅱ)复合溶液中Pb(Ⅱ)的去除率为91.0%,Cd(Ⅱ)的去除率达31.4%,而单独的Pb(Ⅱ)和Cd(Ⅱ)溶液中,Pb(Ⅱ)的去除率高达93.8%,Cd(Ⅱ)的去除率高达41.7%. 根据Fe NPs对Pb(Ⅱ)和Cd(Ⅱ)反应前后的表征结果和Pb(Ⅱ)和Cd(Ⅱ)去除动力学的研究结果表明,Pb(Ⅱ)的去除反应遵循伪一级动力学,而Cd(Ⅱ)的去除遵循伪二级动力学,去除机理可能是Fe NPs对Pb(Ⅱ)起到还原、吸附作用,而对混合液中的Cd(Ⅱ)起到吸附作用.

• Abstract：Green synthesis of iron nanoparticles (Fe NPs) using plant extracts is one of the potential approaches in environmental remediation. This study is aimed to investigate the removal efficiency of Pb(Ⅱ) and Cd(Ⅱ) using Fe NPs synthesized by Ilex latifolia leaf extracts and the effect of temperatures. The results showed that the decrease of removal efficiency of Pb (Ⅱ) from 93.8% to 91.0% was observed when Cd (Ⅱ) was present, while the removal efficiency of Cd (Ⅱ) significantly decreased from 41.7% to 31.4% when Pb (Ⅱ) was co-presented by a dosage of 2.0 g·L^-1 Fe NPs (pH=3.5, 303 K) in 60 min. The removal kinetics of Pb(Ⅱ) and Cd(Ⅱ) followed a pseudo-first-order and a pseudo-second-order equation, respectively. Finally, on the basis of kinetics study and the characterization of Fe NPs before and after Pb(Ⅱ) and Cd(Ⅱ) removal, it was proposed that the removal of Pb (Ⅱ) occurred through both adsorption and chemical reduction, while the removal of Cd(Ⅱ) occurred through adsorption.

• Key words：green synthesis  iron nanoparticles  simultaneously removal  Ilex latifolia  kinetics

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