摘要
采用凹凸棒土对废水中的Cd(II)进行吸附试验,探讨了吸附时间、凹凸棒土投加量、废水中Cd(II)的初始浓度对吸附率的影响,探索最佳工艺条件;同时考察了酸化改性后凹凸棒土对Cd(II)的吸附性能,并分析了凹凸棒土对Cd(II)的吸附等温线。结果表明Cd(II)的初始浓度越高,吸附率越低;Cd(II)在浓度为20 mg/L、吸附时间60 m in、凹凸棒土投加量60 g/L时,去除率达到94.6%;盐酸改性后,Cd(II)在浓度为20 mg/L、吸附时间60 m in、凹凸棒土投加量40 g/L时,吸附率达93.5%,当凹凸棒土投加量为60 g/L时吸附率达98.2%;从拟合吸附等温线相关性系数来看,Langmuir方程能更好地描述吸附过程中凹凸棒土对Cd(II)的吸附。
By dint of attapulgite,the absorption of Cd（II） in wastewater was studied.The effects of the adsorption time,attapulgite input and initial concentration of Cd（II） on adsorption rate were discussed,and the optimum conditions were obtained.Adsorption performance of the acidification modified attapulgite was inspected.Finally the adsorption isotherm of attapulgite on Cd（II） was inspected.The results showed that： the higher the initial concentration of Cd（II） was,the lower adsorption rate became;when the concentration of Cd（II） was 20 mg/L,adsorption time 60 min,attapulgite input 60 g/L,the absorption rate reached 94.6%;By hydrochloric acid modified,when the concentration of Cd（II） was 20 mg/L,adsorption time 60 min,attapulgite input 40 g/L,the absorption rate reached 93.5%,attapulgite input 60 g/L,the absorption rate reached 98.2%;Langmuir equation was well fit for Cd（II） adsorption process by attapulgite from the fitting correlation coefficient of adsorption isotherm.
出处
《安徽农业科学》
CAS
北大核心
2011年第23期14221-14223,共3页
Journal of Anhui Agricultural Sciences
基金
中石化科技开发项目(G1715-2010-ZS0002)
江苏省大学生实践创新项目
