质子化剩余污泥吸附染料的性能及机理  

Adsorption performance and mechanism of binding of dye by protonated coke waste

作　　者：崔龙哲[1] 吴桂萍[1] 邓克俭[1] 

机构地区：[1]中南民族大学化学与材料科学学院催化材料科学湖北省重点实验室,湖北武汉430074

出　　处：《化工学报》2007年第5期1290-1295,共6页CIESC Journal

基　　金：国家自然科学基金项目(20577070);中南民族大学引进人才科研启动基金(yzz05019)~~

摘　　要：以城市污水处理厂的剩余污泥为原料,经过质子化处理制备成生物吸附剂,进行了吸附水溶液中活性红4(RR4)和亚甲兰(MB)的研究。溶液的pH值是影响吸附效果的一个重要因素,阴离子型的RR4在酸性条件下吸附量大,而阳离子型的MB则在中性和碱性条件下吸附量大。吸附RR4和MB的数据对Langmuir等温吸附式拟合良好,在pH=2条件下,生物吸附剂对RR4的最大吸附量(qm)为(25.8±0.4)mg.g-1;在pH=7条件下,对MB的最大吸附量(qm)为(161.2±10.0)mg.g-1。电位滴定及FTIR分析表明,这种生物吸附剂主要含有磺酸基、磷酸基及氨基等功能团,其对染料的吸附以单分子层的化学吸附为主,功能团在不同的pH条件下呈现不同的电离性能并在吸附过程中发挥重要作用。The protonated coke waste was used as a new type of biosorbent for the removal of anionic dye Reactive Red 4 （RR4） and cationic dye Methylene Blue （MB）. The uptake was significantly affected by the pH of the solution. The Langmuir isotherm was found to represent the sorption data of RR4 and MB well. The maximum adsorption capacities of RR4 and MB on the biosorbent were （25.8±0.4） mg· g^-1 and （161.2±10. 0） mg· g^-1 at pH 2 and 7 respectively. To identify the binding sites in the biosorbent, the biosorbent was potentiometrically titrated, and the data was analyzed through nonlinear regression of the proton-binding model. As a result, sulfonate, phosphonate and amine sites were present in the biosorbent, which was confirmed by FTIR. Chemical sorption dominated the binding of dye molecules. Different functional groups were ionized in different pH conditions and played a pronounced role in the sorption.

关 键 词：生物吸附剂 活性红4 亚甲兰 电位滴定 剩余污泥 

分 类 号：X703.1[环境科学与工程—环境工程]