给水厂污泥对Cr(Ⅵ)的吸附特性研究  

The Cr(Ⅵ) Adsorption Properties of the Water Treatment Sludge

作　　者：仇付国[1] 童诗雨 吕华东 QIU Fuguo;TONG Shiyu;LÜ Huadong(Key Laboratory of Urban Stormwater System and Water Environment of Ministry of Education,Beijing University of Civil Engineering and Architecture,Beijing 100044,China)

机构地区：[1]北京建筑大学城市雨水系统与水环境教育部重点实验,北京100044

出　　处：《水处理技术》2022年第5期59-64,共6页Technology of Water Treatment

基　　金：国家自然科学基金资助项目(51278024)。

摘　　要：为探讨给水厂污泥(WTR)作为Cr(Ⅵ)吸附剂的可能性,探讨了pH、初始浓度、污泥粒径和温度对WTR吸附Cr(Ⅵ)的影响。结果表明,污泥对Cr(Ⅵ)的吸附量随pH的增大而减小,吸附平衡时间为9 h,吸附量随污泥粒径的减小而增加;在15~35℃范围内,饱和吸附量随温度的升高而增加,35℃时饱和吸附量达到45.59 mg/g。准二级动力学方程(R2>0.99)能够很好地拟合给水厂污泥对Cr(Ⅵ)的吸附过程,吸附平衡符合Langmuir模型。利用X射线光电子能谱分析(XPS)对吸附机理探究表明,WTR对Cr(Ⅵ)的去除不仅包括吸附作用,还存在着氧化还原反应。The feasibility of water treatment residual(WTR) as an adsorbent for Cr(Ⅵ) was explored. The effects of pH, initial concentration of Cr(Ⅵ),sludge particle size, and temperature on the Cr(Ⅵ) adsorption by WTR were investigated. The results showed that the adsorption capacity decreased with the increase of the pH, and the time to reach the adsorption equilibrium was 9 h. The decrease of the sludge particle size could increase the specific surface area of WTR, and improve the adsorption capacity. Among the tested temperatures(15~35 ° C), the saturated adsorption capacity increased with the increase of the temperature, and the maximum adsorption capacity(45.59 mg/g) was obtained at 35 °C. The pseudo-second order kinetic equation(R^(2)>0.99) and Langmuir model were suitable for estimating the adsorption kinetics and the adsorption equilibrium, respectively. The X-ray photoelectron spectroscopy analysis(XPS) analysis indicated that the removal of Cr(Ⅵ) on WTR could be achieved by adsorption, redox reactions, and complexation.

关 键 词：给水厂污泥 吸附 重金属 Cr(Ⅵ) 

分 类 号：TQ424[化学工程]