磁性沸石的制备及其对水溶液中镍的吸附  

Synthesis of Magnetic Zeolite and its Absorption of Nickel in Aqueous Solution

作　　者：马海清[1] 黄芳[2] 崔龙哲[1] 刘玲玉[1] 吴桂萍[1] 

机构地区：[1]中南民族大学资源与环境学院,湖北武汉430074 [2]黄石市环境保护研究所,湖北黄石435000

出　　处：《水处理技术》2016年第4期65-68,共4页Technology of Water Treatment

基　　金：湖北省自然科学基金(2015CFB550)

摘　　要：以红土和人造沸石为原料,戊二醛为交联剂,成功制备出磁性沸石RAG。X射线衍射光谱(XRD)和傅立叶变换红外光谱(FTIR)表征结果表明,合成的RAG保持了红土和人造沸石的结构和特性。将该磁性吸附剂应用于对水溶液中镍的吸附,研究了pH、温度、时间、镍溶液含量、吸附剂投加量对吸附性能的影响,结果表明,RAG对水溶液中镍的吸附量随p H的升高而增大,吸附过程满足拟2级动力学模型和Freundlich等温吸附模型,3 h时达到吸附平衡,303 K时最大吸附量为23.27 mg/g,吸附剂投加量为8.0 g/L时镍的平衡质量浓度低于1.0 mg/L,满足GB 8978-1996排放标准。Magnetic zeolite RAG was prepared by combining red mud and artificial zeolite using glutaraldehyde as crosslinking agent. The characterizations of XRD and FTIR showed that RAG kept the structures and features of red mud and artificial zeolite. The influence factors such as pH, temperature, contact time, solution concentr and dosage were studied in the nickel adsorption by RAG. The results indicated that the adsorption of nickel by RAG added with the increase of pH and the adsorption process followed pseudo-second-order kinetics and Freundlich isotherm models. It took 3 h to reach equilibrium. The maximum adsorption capacity was 23.27 mg/g at 303 K. The equilibrium mass concentration of nickel was below 1.0 mg/L when the dosage of RAG was 8.0 g/L, meeting the emission standard GB 8978-- 1996.

关 键 词：红土 人造沸石 磁性沸石 吸附 镍 

分 类 号：TQ424[化学工程]