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ZnAlLa类水滑石对污泥脱水液中磷酸根的吸附
摘要：通过共沉淀法合成了ZnAlLa三元类水滑石,并考察了其结构特征和对磷酸根的吸附性能.结果表明,在保持类水滑石层状结构的条件下,La的适量掺杂可增强吸附剂对磷酸根的吸附.当Zn∶Al∶La摩尔比为2.00∶0.90∶0.10时,ZnAlLa类水滑石在24h内对污泥脱水液中磷酸根的吸附量为35.15 mg P·g~(-1),比无La时的吸附量提高了41.9%.300℃焙烧处理后,ZnAlLa样品转化为亚稳态的复合金属氧化物,同时比表面积明显增加,其磷酸根吸附量约为焙烧前的1.48倍.ZnAlLa对磷酸根的吸附在pH变化及竞争离子存在时表现出较强的稳定性.该吸附剂对污泥脱水液中磷酸根的吸附符合假二级吸附动力学;吸附等温线表现为Langmuir型.Abstract：A series of ZnAlLa layered double hydroxides (LDHs) were synthesized by the coprecipitation method,and their structure and phosphate adsorption capacities were studied.The results showed that the layered structure was maintained when a proper amount of La was added as a trivalent cation into ZnAl LDHs.At the Zn∶Al∶La molar ratio of 2.00∶0.90∶0.10,the phosphate adsorption by the obtained ZnAlLa LDHs in 24 h was 35.15 mg P·g~(-1),which was 41.9% higher than that by the La-free LDHs.After calcination at 300℃,the ZnAlLa LDHs were transformed to metastable mixed metal oxides with a higher specific surface area.The phosphate adsorption by the calcined LDHs was 1.48-fold higher when compared with that by the raw material.The phosphate adsorption by the ZnAlLa showed a high stability against pH variation and competing ions in the solution.The adsorption kinetics followed a pseudo-second-order model and the isotherms were of the Langmuir type. 作者： 程翔[1]黄新瑞[1]王兴祖[2]孙德智[2] Author： CHENG Xiang[1] HUANG Xinrui[1] WANG Xingzu[2] SUN Dezhi[2] 作者单位： 哈尔滨工业大学市政环境工程学院,黑龙江,哈尔滨,150090北京林业大学环境科学与工程学院,北京,100083 期 刊： 化工学报 ISTICEIPKU Journal： CIESC JOURNAL 年，卷(期)： 2010, 61(4) 分类号： X703 关键词： ZnAlLa类水滑石 污泥脱水液 磷酸根 吸附 Keywords： ZnAlLa layered double hydroxides excess sludge filtrate phosphate adsorption 机标分类号： TQ4 O6 机标关键词： 三元类水滑石 污泥脱水 磷酸根 吸附量 excess sludge phosphate adsorption layered double hydroxides LDHs coprecipitation method adsorption kinetics layered structure specific surface Langmuir型 复合金属氧化物 吸附剂 molar ratio mixed metal 吸附动力学 吸附性能 吸附等温 基金项目： 国家高技术研究发展计划(863计划)【ZnAlLa类水滑石对污泥脱水液中磷酸根的吸附】相关文章：
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