竹炭对溶液中Zn^(2+)的吸附行为研究

Adsorption Behavior of the Bamboo-charcoal for Zn^(2+)

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Freund lich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。

The adsorption behavior of the bamboo-charcoal for Zn^2＋ was studied in an aqueous solution, The effects of contact time, pH, mass of absorbent, adsorption temperature, and initial concentration of Zn^2＋ on absorption were determined. Results showed that bamboo-charcoal could effectively remove Zn^2＋ 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 Zn^2＋ 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 %.