多酚原位固化茶渣对水中Cr（Ⅵ）的吸附

通过甲醛与茶渣中多酚类组分的反应制备了多酚原位固化茶渣吸附材料,并将其用于对水中Cr（Ⅵ）的吸附。表征结果显示：茶渣多酚的原位固化提高了其热稳定性,同时对茶渣粒料起到了修补增强作用。固化茶渣对Cr（Ⅵ）的吸附量随溶液pH的减小而增大。在吸附温度303 K、初始Cr（Ⅵ）质量浓度60 mg/L、吸附剂投加量1.0 g/L、吸附时间300 min、溶液pH为2的条件下,固化茶渣对Cr（Ⅵ）的吸附量为56.56 mg/g,去除率达94.3%。固化茶渣对Cr（Ⅵ）的吸附符合Langmuir等温吸附模型和准二级动力学方程,吸附是一个自发的、吸热过程,303,318,333 K下的Langmuir饱和吸附量分别为83.26,107.64,129.20 mg/g。

Removal of Cr（Ⅵ）from solution using polyphenol in-situ immobilized tea residue

The polyphenol in-situ immobilized tea residue absorbent was prepared by reaction of formaldehyde with polphenols in tea residue,and was used for adsorption of Cr（Ⅵ）from waster. The characterization results showed that the polyphenol in-situ immobilized in tea residue improved the thermal and mechanical stabilities of the tea residue particles. The Cr（Ⅵ）adsorption quantity of the immobilized tea residue increased with the decrease of solution pH. Under the conditions of adsorption temperature 303 K,initial Cr（Ⅵ）mass concentration 60 mg/L,absorbent amount 1.0 g/L,adsorption t ime 300 min and solution pH 2,the Cr（Ⅵ）adsorption quantity was 56.56 mg/g and the removal rate reached 94.3%. The adsorption of Cr（Ⅵ）on the immobilized tea residue fitted Langmuir isothermal adsorption model and pseudo- second-order kinetic equation. The adsorption was a spontaneous and endothermic process. The Langmuir saturated adsorption capacity were 83.26,107.64,129.19 mg/g at 303,318,333 K,respectively.