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林业科学 ›› 2006, Vol. 42 ›› Issue (9): 102-105.doi: 10.11707/j.1001-7488.20060920

• 论文及研究报告 • 上一篇    下一篇

竹炭对溶液中汞(Ⅱ)离子的吸附行为研究

张启伟 王桂仙   

  1. 丽水学院化学系,丽水323000
  • 收稿日期:2005-03-14 修回日期:1900-01-01 出版日期:2006-09-25 发布日期:2006-09-25

Adsorption Behavior of the Bamboo-Charcoal for Mercury (Ⅱ) in Aqueous Solution

Zhang Qiwei,Wang Guixian   

  1. Department of Chemistry,Lishui University Lishui 323000
  • Received:2005-03-14 Revised:1900-01-01 Online:2006-09-25 Published:2006-09-25

摘要:

研究不同竹炭对溶液中Hg2+的吸附能力,包括接触时间、pH值、投料量、吸附温度和溶液中汞的初始浓度对吸附的影响。结果表明:竹炭能有效去除水溶液中的汞;在pH值3.2~6.2的范围内,竹炭对溶液中的汞均有较大的吸附能力,最佳的吸附酸度为pH=5.9 ;吸附温度升高,吸附量减小,说明吸附是放热过程;Freundlich等温吸附模型能较好地描述吸附过程。用水和微波加热的方法对吸附后的竹炭进行再生试验,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汞吸附材料。

关键词: 竹炭, 汞, 吸附, 影响因素

Abstract:

The adsorption capacities of the bamboo-charcoal for mercury(Ⅱ)was studied in aqueous solution. Parameters studied include contact time,pH value,mass of absorbent, adsorption temperature,and initial concentration of mercury in solution.Results showed that bamboo-charcoal could effectively remove mercury from aqueous solution. The bamboo-charcoal showed high adsorption ability for mercury at a wide pH range(pH=3.2~6.2), The optima adsorption acidity of bamboo-charcoal for Hg(II) is pH=5.90 in Hac-NaAc medium. Adsorption decreased with increases in adsorption temperatures, it means that the adsorption process is a exothermic process. The adsorption behavior of the bamboo-carbon for mercury(Ⅱ) obeys the Freundlich isotherm model. After the bamboo-charcoal of adsorption can be regenerated quantificationally with H2O and microwave heating,the percentages of regeneration reach upwards of 97%. The bamboo-charcoal are the better absorptive material removing mercury(Ⅱ)from aqueous solution.

Key words: bamboo-charcoal, mercury (Ⅱ), adsorption, influencing factors