改性油菜秸秆对Co(Ⅱ)的吸附  

Adsorptive removal of Co(Ⅱ) from aqueous solution by using modified cole straw

作　　者：汪洋[1,2] 吴缨[2] 

机构地区：[1]贵州大学化学与化工学院,贵阳550025 [2]合肥学院化学与材料工程系,合肥230601

出　　处：《环境工程学报》2016年第1期379-384,共6页Chinese Journal of Environmental Engineering

基　　金：合肥学院人才基金(12RC01)

摘　　要：利用ZnCl_2对油菜秸秆进行改性,制得生物吸附剂。通过单因子优化实验,研究其对水溶液中的重金属Co(Ⅱ)的吸附效果。结果表明:在298 K下,pH为6.5,吸附剂用量2 g/L时,对初始浓度为10.0 mg/L Co(Ⅱ)水溶液的吸附率达95%。利用Langmuir和Freundlish等温线模型对实验数据进行拟合分析,Langmuir等温线模型很好地描述了油菜秸秆对Co(Ⅱ)的吸附过程。热力学参数表明,吸附是一个自发放热反应。改性油菜秸秆对Co(Ⅱ)的吸附符合准二级动力学方程。在室温下秸秆对Co(Ⅱ)的饱和吸附量为10.3 mg/g。The modified cole straw by ZnCl2 was picked as adsorbent. The removal of Co（ Ⅱ） from aqueous solution was studied by single-factor optimization experiments. The result was that when temperature is 298 K,pH6. 5,adsorbent dosage is 2 g / L,the removal rate can reach about 95% from 10. 0 mg / L of Co（ Ⅱ）. According to the Langmuir and Freundlish isotherm models,the non-linear regressive analysis of equilibrium adsorption data was conducted,respectively. The results show that the Langmuir model provides good correlations of the experimental data. The thermodynamics parameters of adsorption system indicated exothermic and spontaneous process.The dynamic data fitted the pseudo-second order model. The maximal equilibrium quantity of modified cole straw from Langmuir model was 10. 3 mg / g at room temperature.

关 键 词：ZNCL2 改性 钴离子 油菜秸秆 吸附 

分 类 号：X703[环境科学与工程—环境工程]