改性污泥腐殖酸的表征及其对Cu^(2+)的吸附特性  

Characterization of modified sludge-based humic acid and its adsorption properties for Cu^(2+)

作　　者：龙良俊[1,2] 王里奥[1] 余纯丽[2] 魏星跃[2] 卓琳[2] 

机构地区：[1]重庆大学资源及环境科学学院,重庆400044 [2]重庆工商大学环境与资源学院,重庆400067

出　　处：《中国环境科学》2017年第3期1016-1023,共8页China Environmental Science

基　　金：重庆市科委应用开发计划项目(cstc2014yykfA20002)

摘　　要：以城镇污水厂的污泥为原料提取污泥腐殖酸(S-HA),并对其改性得到改性污泥腐殖酸(MS-HA).使用元素分析、扫描电镜(SEM)、傅里叶红外光谱(FT-IR)、X射线衍射(XRD)和热重-差热扫描量热分析(TG-DSC)对其进行了表征,分析讨论了MS-HA的物理化学特性,研究了MS-HA对Cu^(2+)的吸附动力学及等温吸附特性.结果显示,MS-HA的C/N、C/H分别为5.58和6.70,表面疏松并形成非均匀孔,改性过程发生了脱水和脱羧反应,仍保持无定形结构特征,对Cu^(2+)的吸附平衡时间为18h,最佳吸附pH值为4~6,不同温度下的吸附过程均符合准二级动力学模型,吸附等温线符合Langmuir模型.Humic acid（S-HA） was extracted from municipal sewage sludge. The S-HA was further modified by heating and the modified humic acid was obtained（MS-HA）. The physicochemical properties of the samples were characterized with elemental analysis, scanning electron microscopy（SEM）, Fourier transform infrared spectroscopy（FT-IR）, X-ray diffraction（XRD） and thermogravimetric-differential scanning calorimetry（TG-DSC）. The adsorption kinetics and isothermal adsorption process for copper（II） ions from aqueous solutions was investigated. The results indicated that the C/N and C/H of MS-HA ratio were 5.58 and 6.70, respectively. The surface of MS-HA was loose and abundant with non-homogeneous pores. The dehydration and decarboxylic reaction took place during the modification process and the amorphous structure was well-maintained. The equilibrium time was 18 h and the optimal pH value was 4～6. The kinetic parameters and isotherms were calculated from the experimental data. The adsorption process can be fitted well with pseudo-second-order kinetic model. The adsorption data obtained can be described by the Langmuir adsorption isotherm model.

关 键 词：污泥 腐殖酸 CU2+ 吸附 

分 类 号：X703[环境科学与工程—环境工程]