碳氮共掺杂污泥基吸附剂去除水中Cr(Ⅵ)  

Adsorptive removal of Cr(Ⅵ) from water by C-N-codoped sludge-based adsorbents

作　　者：刘慧君[1] 尹文霞[1] 张立国[1] 付临汝 刘蕾[2] 吴宏海[1] 肖羽堂[1] 吴培煜 石思琦 

机构地区：[1]华南师范大学化学与环境学院,环境理论化学省部共建教育部重点实验室,广州510006 [2]东莞理工学院化学与环境工程学院,广东高校化工清洁生产与绿色化学品工程技术开发中心,东莞523808

出　　处：《环境工程学报》2016年第8期4147-4152,共6页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(41372050);广东省自然科学基金项目(2016A030313432);广东省高校优秀青年创新人才培养计划资助项目(2012LYM_0050);环境理论化学省部共建教育部重点实验室自主项目;广东高校化工清洁生产与绿色化学品工程技术开发中心项目(201405)

摘　　要：以城市污水厂脱水污泥为原料,通过添加尿素等辅助材料碳化制备污泥基吸附剂。采用比表面积孔隙分布测定仪、扫描电镜（SEM）、X射线衍射仪（XRD）对吸附剂表面组成及其结构进行表征,对比研究了掺入添加剂前后碳化污泥吸附剂对Cr（Ⅵ）的吸附行为。结果表明,C/N共掺杂碳化污泥吸附剂对Cr（Ⅵ）的吸附性能较直接碳化污泥吸附剂明显提高,2种吸附剂的最佳吸附时间分别为2 h和4 h,pH是影响污泥基吸附剂吸附去除Cr（Ⅵ）的关键因素,其最适p H值均在1.0～2.5范围内。室温下C/N共掺杂污泥吸附剂吸附Cr（Ⅵ）符合Langmuir吸附模型,准二级动力学模型能很好地描述2种碳化污泥基吸附剂的吸附行为。热力学研究表明,C/N共掺杂污泥吸附剂对Cr（Ⅵ）的吸附是一个自发的吸热过程。Carbonized sludge-based adsorbents（ SBAs） were prepared from municipal dewatered sludge with the addition of urea as supplementary material. The surface composition and structure of the SBAs were characterized using SBET,SEM,and XRD,and the adsorption behavior of Cr（ Ⅵ） on two kinds of SBAs was investigated comparatively. The results showed that the C-N-codoped carbonized SBA performed better than the directly carbonized one at Cr（ Ⅵ） adsorption. The optimum adsorption time for the two kinds adsorbents were 2 h and 4 h,respectively. As the key influence factor for Cr（ Ⅵ） removal,the optimum p H value was in the range of 1. 0 to 2. 5. At room temperature,the C-N-codoped SBA for Cr（ Ⅵ） removal agreed with the Langmuir isotherm model. The adsorption kinetic data fit well with the pseudo-second-order model for the two kinds of SBAs.The thermodynamic analysis showed that the adsorption process of Cr（ Ⅵ） on C-N-codoped SBA was spontaneous and endothermic.

关 键 词：污泥吸附剂 尿素 吸附 Cr(Ⅵ) 碳氮共掺杂 

分 类 号：X703[环境科学与工程—环境工程]