对茶叶纤维吸附Cu2+的性能进行了研究。结果表明,茶叶纤维对Cu2+有明显的吸附作用。pH值为4.55左右,温度在30℃左右时,对Cu2+的吸附较为有利;当Cu2+的质量浓度为200 mg/L时,随着茶叶纤维添加量增加,吸附量先升后降,茶叶纤维添加量为90 mg左右时吸附量最大。茶叶纤维对Cu2+的吸附过程符合拟二级动力学方程。Langmuir等温吸附方程比Freundlich方程能更好地描述茶叶纤维对Cu2+的平衡吸附行为,最大吸附量达到16.78 mg/g。
The ability of tea fiber to absorb the Cu2+ was investigated. The results showed that the optimal pH value and temperature for the adsorption were about 4.55 and 30℃ respectively. When Cu2+ initial concentration was 200 mg/L, the adsorption capacity of tea fiber rose first and then decreased with the increase of its addition, and the adsorption capacity reached the maximum with its addition dose of 90 mg. The adsorption process of tea fiber for Cu2+ followed a pseudo-second order kinetic equation. The adsorption was more fitted to the Langmuir isotherm equation than the Freundlich isotherm equation. The maximum adsorption capacity was 16.78 mg/g.
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