中文摘要：

采用锆对天然沸石进行改性,并研究了锆改性沸石对水中磷酸盐和铵的吸附特性.结果表明,锆改性沸石对水中磷酸盐和铵均具有很好的吸附能力.锆改性沸石对水中磷酸盐和铵的吸附动力学过程满足准二级动力学模型.Langmuir、Freundlich和Dubinin–Radushkevich（D–R）等温吸附模型可以很好地描述锆改性沸石对水中磷酸盐的等温吸附行为.Langmuir等温吸附模型可以很好地描述锆改性沸石对水中铵的等温吸附行为.由Langmuir等温吸附模型计算得到锆改性沸石对磷酸盐和铵的最大吸附容量分别达到26.2,7.82 mg/g.热力学参数表明锆改性沸石对水中磷酸盐的吸附是自发的吸热反应过程.锆改性沸石对水中磷酸盐的吸附能力随着pH值的增加而降低.当pH4~8时,锆改性沸石对水中铵的吸附能力较高;当pH低于4或高于8时,对铵的吸附能力下降.水中共存的Cl-、SO42-、HCO3-和NO3-等阴离子对锆改性沸石吸附磷酸盐的影响很小,而共存的SiO32-对磷酸盐的吸附则具有较强的负面影响.水中共存的Ca2＋和Mg2＋对锆改性沸石吸附铵的影响较小,而共存的K＋和Na＋对铵的吸附则具有较强的负面影响.锆改性沸石吸附水中磷酸盐的主要机制是阴离子配位体的交换,吸附水中铵的主要机制是与沸石中可交换阳离子的离子交换.

英文摘要：

The adsorption of phosphate and ammonium from aqueous solution on zirconium modified zeolite（ZrMZ） was investigated using batch experiments.ZrMZ was effective for phosphate and ammonium removal from aqueous solution.The adsorption kinetics data of phosphate and ammonium on ZrMZ could be well described by a pseudo-second-order model.The adsorption equilibrium data of phosphate on ZrMZ fitted well to the Langmuir,Freundlich and Dubinin–Radushkevich（D–R） isotherm models.The adsorption equilibrium data of ammonium onto ZrMZ fitted better to the Langmuir isotherm model than the Freundlich and D-R isotherm models.Based on the Langmuir isotherm,the maximum monolayer phosphate and ammonium adsorption capacities for ZrMZ were 26.2 and 7.82 mg/g at 303 K,respectively.Thermodynamic parameters showed that the adsorption of phosphate on ZrMZ was spontaneous and endothermic in nature.The phosphate adsorption capacity for ZrMZ decreased with increasing pH from 3 to 12.The ammonium adsorption capacity for ZrMZ was relatively high at pH 4~8,and decreased with increasing pH from 8 to 12 or with decreasing pH from 4 to 3.The presence of Cl-,SO42-,HCO3-and NO3-in aqueous solution had a slight effect on phosphate adsorption onto ZrMZ,while coexisting SiO32-reduced the phosphate adsorption capacity for ZrMZ.The presence of Ca2＋and Mg2＋had a slight effect on ammonium adsorption onto ZrMZ,while coexisting Na＋and K＋reduced the ammonium adsorption capacity for ZrMZ.The mechanism for phosphate adsorption onto ZrMZ was ligand exchange.The mechanism for ammonium adsorption into ZrMZ was cation exchange.