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生物质化学工程

生物质化学工程 ›› 2006, Vol. 40 ›› Issue (3): 17-20.

• 研究报道 • 上一篇    下一篇

竹炭对溶液中Zn2+的吸附行为研究

王桂仙, 张启伟   

  1. 丽水学院, 化学系, 浙江 丽水 323000
  • 收稿日期:2005-11-14 修回日期:1900-01-01 出版日期:2006-05-30 发布日期:2006-05-30
  • 通讯作者: 张启伟,浙江浦江人,副教授,从事物理化学及环境化学。

Adsorption Behavior of the Bamboo-charcoal for Zn2+

WANG Gui-xian, ZHANG Qi-wei   

  1. Department of Chemistry, Lishui University, Lishu 323000, China
  • Received:2005-11-14 Revised:1900-01-01 Online:2006-05-30 Published:2006-05-30

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摘要： 研究了竹炭对溶液中Zn2+的吸附行为。测定了接触时间、pH值、投料量、吸附温度和溶液中Zn2+的初始浓度对吸附的影响。结果表明:竹炭能有效除去水溶液中的Zn2+;在pH=3.2～6.2的HAc-NaAc缓冲体系中,竹炭对溶液中的Zn2+均有较大的吸附能力,其最佳吸附酸度pH=5.3;吸附温度升高,吸附量减小,说明吸附是放热过程;研究表明Freundlich等温吸附模型能较好的描述吸附过程。用水和微波加热的方法对吸附后的竹炭进行再生,竹炭的吸附能力可恢复到原来的97%以上。竹炭可作为理想的除锌吸附材料。

关键词: 竹炭, 锌离子, 吸附行为

Abstract: The adsorption behavior of the bamboo-charcoal for Zn2+ was studied in an aqueous solution.The effects of contact time, pH, mass of absorbent, adsorption temperature,and initial concentration of Zn2+ on absorption were determined.Results showed that bamboo-charcoal could effectively remove Zn2+ from the aqueous solution with high adsorption ability at pH 3.2～6.2, in which the optimum is pH 5.3 in HAc-NaAc medium. Because adsorption decreased with increase in adsorption temperatures, it means that the sorption process is an exothermic process, which the adsorption behavior of the bamboo-carbon for Zn2+ obeys the Freundlich isotherm model. After adsorption the bamboo-charcoal can be regenerated quantificationally with H2O and microwave heating in a regeneration ratio of 97%.

Key words: bamboo-charcoal, Zn2+, adsorption

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