锆—Fe_3O_4—沸石复合材料对水中磷酸盐和铵的吸附作用  

REMOVAL OF PHOSPHATE AND AMMONIUM FROM AQUEOUS SOLUTION BY USING ZIRCONIUM/MAGNETITE/ZEOLITE COMPOSITE AS ADSORBENT

作　　者：李佳[1] 詹艳慧[1] 林建伟[1] 王鹏钧 陈祖梅[1] 

机构地区：[1]上海海洋大学海洋科学学院,上海201306

出　　处：《水处理技术》2013年第12期56-62,共7页Technology of Water Treatment

基　　金：国家自然科学基金项目(50908142);上海市科学技术委员会科研项目(10230502900);上海高校青年教师培养资助计划项目(ZZhy12012);长江水环境教育部重点实验室开放基金项目(YRWEF201107)

摘　　要：采用氧氯化锆、Fe2+、Fe3+和天然沸石等材料制备了锆-Fe3O4-沸石复合材料,并考察了锆-Fe3O4-沸石复合材料对水中磷酸盐和铵的去除作用。锆-Fe3O4-沸石复合材料对水中磷酸盐的去除能力随着溶液pH的增加而降低。锆-Fe3O4-沸石复合材料对水中磷酸盐的吸附平衡数据可以采用Langmuir和Dubinin-Radushkevich(D-R)模型加以拟合,对水中铵的吸附平衡数据可以采用Langmuir、Freundlich和D-R模型加以拟合。准2级动力学模型可以用于描述锆-Fe3O4-沸石复合材料对水中磷酸盐和铵的吸附动力学过程。锆-Fe3O4-沸石复合材料对水中磷酸盐的吸附是自发吸热过程。0.2 mol/L的NaOH溶液可以使91%左右吸附到锆-Fe3O4-沸石复合材料上的磷酸盐解吸下来,0.2 mol/L的NaCl溶液可以使92%左右吸附到锆-Fe3O4-沸石复合材料上的铵解吸下来。锆-Fe3O4-沸石复合材料对水中磷酸盐的吸附机制主要是配位体交换作用,对水中铵的吸附机制主要是阳离子交换作用。In this study, a novel zirconium/magnetite/zeolite composite （Zr/Fe3O4Zeo） was prepared and used as an adsorbent to remove phosphate and ammonium ffom aqueous solution. Theeffectofseveraloperatingparameterssuchasadsorbentdosage, solutionpH, initial adsorbate concentration, reaction time, and temperature on phosphate adsorption by Zr/Fe3O4Zeo was investigated using batch experiments. The effect of several operating parameters such as adsorbent dosage, initial adsorbate concentration and reaction time on ammonium adsorption by Zr/Fe3O4/Zeo was investigated using batch experiments. The phosphate adsorption capacity for Zr/Fe3O4/Zeo decreased with increasing solution pH. The equilibrium adsorption data of phosphate by Zr/Fe3O4/Zeocould be described by the Langmuir and Dubinin-Radushkevich （D-R） isotherm models. The equilibrium adsorption data of ammonium by Zr/Fe3O4/Zeo could be described by the Langmuir, Freundlich, and D-R isotherm models. The adsorption kinetic data of phosphate and ammonium by Zr/Fe3O4/Zeo well followed a pseudo-seennd-order model. The adsorption process of phosphate by Zr/Fe3O4/Zeo was endothermic and spontaneous in nature. The regeneration experiments showed that about 91% of phosphate adsorbed by Zr/Fe3OdZeo could be desorbed in 0.2 mol/L NaOH solution, and about 92% of ammonium adsorbed by Zr/Fe3O4/Zeo could be desorbed in 0.2 mol/L NaCl solution. Ligand exchange was the main mechanism for phosphate adsorption by Zr/Fe3O4/Zeo. Cation exchange was the main mechanism for ammonium adsorption by Zr/Fe3O4/Zeo.

关 键 词：锆-Fe3O4-沸石复合材料 磷酸盐 铵 吸附 

分 类 号：TQ424[化学工程]