生物吸附剂菹草干粉对Cr(Ⅵ)的吸附性能

Adsorption of Cr(Ⅵ) by Dry Powder of Potamogeton crispus

开发了高效去除重金属Cr(Ⅵ)污染的生物吸附剂,菹草(Potamogeton crispus)干粉吸附剂,通过单因素分析考察了吸附时间、吸附剂颗粒大小、溶液初始p H值、吸附剂用量、Cr(Ⅵ)初始浓度以及离子强度等对重金属离子Cr(Ⅵ)的吸附性能。结果表明,对吸附效果影响显著的因素有Cr(Ⅵ)初始浓度、吸附剂颗粒大小、溶液初始p H值和离子强度;其吸附行为符合准二级动力学方程,相关系数为0.9998;菹草对Cr(Ⅵ)的吸附等温线符合Langmuir方程。

The dry powder of Potamogeton crispus was developed as an efficient biosorbent material for the removal Cr（ Ⅵ） from wastewater. The effects of adsorption equilibrium time, grain size of adsorbent particles, initial pH, the dosage of adsorbent, initial concentration of Cr （ Ⅵ ）, and ionic strength on the adsorption performance were investigated by single-factor experiments. The adsorption process follows the pseudo secondorder kinetic with a correlation coefficient（R^2） of 0. 9998. The experimental data fit with Langmuir isotherm model. The maximum adsorption capacity of Cr（ Ⅵ） by Potamogeton crispus is 35.0 mg/g.