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许智华, 张道方, 陈维芳.纳米铁/活性炭新型材料的制备及其对铜离子的吸附性能研究水资源与水工程学报[J].,2015,26(2):7-11
纳米铁/活性炭新型材料的制备及其对铜离子的吸附性能研究
Research on preparation of a new material of nano-iron and activated carbon with its adsorptive properties to copper ion
  
DOI:10.11705/j.issn.1672-643X.2015.02.002
中文关键词:  纳米铁  活性炭    重金属  铜离子吸附量
英文关键词:nano-iron  activated carbon  copper  heavy metal  adsorption of copper iron
基金项目:上海市科学技术委员会重点科技攻关专项(13230502300); 上海市环境保护科学技术发展基金重点科研项目(沪环科2012-03)
作者单位
许智华, 张道方, 陈维芳 (上海理工大学 环境与建筑学院 上海 200093) 
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中文摘要:
      以活性炭为载体,采用沉淀法制备纳米铁/活性炭新型材料,对活性炭的结构变化进行BET 和TEM表征分析,研究纳米铁负载前后活性炭对水中铜离子的吸附能力以及pH值、起始浓度、吸附时间等因素对吸附性能的影响,同时考察其再生性能。结果表明:纳米铁成功负载于活性炭上,随着pH值的增加,吸附容量逐渐增大,当pH=6时,纳米铁/活性炭的最大吸附量为18.73 mg/g,与活性炭相比提高了150%。新型材料对铜离子的吸附过程符合Langmuir和Freundlich吸附模型,对铜离子的吸附量随时间变化的规律符合准二级动力学模型,由于负载的纳米铁阻碍了铜离子向材料表面扩散,其吸附速率仅为0.002 g/(mg·min),与活性炭相比下降了60%左右。新型材料再生效率高,具有较好的应用前景。
英文摘要:
      Nano-iron was doped into activated carbon by a simple precipitation method. The new material was characterized by BET and TEM and further it along with activated carbon were evaluated in the adsorptive capacity for different factors such as pH, initial concentrations, adsorption time and under batch tests and regenerability was also conducted. The results showed that nano-iron particles were successfully doped into activated carbon.The adsorption process of the new material was more favorable at high pH value, and when pH equals 6,the maximum adsorptive capacity of nano-iron and activated carbon achieves to 18.73 mg/g, which is higher then that of activated carbon, increases by 150 %. Adsorption isotherm fitted well Langmuir and Freundlich models. And adsorption kinetics fitted well with Pseudo-second-order models, as to the loading nano-iron may cause obstruction of copper diffusion to the active adsorptive sites, in comparing with the adsorption rate of activated carbon, that was only 0.002 g/(mg·min), decreases by 60 % . The new material has a good regenerability and better application prospect.
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