采用溶剂热法合成了金属有机骨架材料MOF(Ni)-74,并系统研究了其对水溶液中Cu2+的吸附性能。采用X射线粉末衍射仪和原子吸收分光光度计对样品的物相及其对Cu2+的吸附性能进行了表征。研究了溶液pH、Cu2+初始浓度及吸附剂投加量等因素对Cu2+在MOF(Ni)-74上吸附性能的影响,并对其吸附等温过程和吸附动力学进行了研究。结果表明:在pH 1～6范围内,MOF(Ni)-74吸附Cu2+的最适pH为6。Cu2+初始浓度增大,MOF(Ni)-74对Cu2+的平衡吸附量增大。吸附剂投加量增大,溶液中Cu2+的去除率提高,但Cu2+的平衡吸附量减小。MOF(Ni)-74对Cu2+的吸附符合Freundlich等温吸附模型和准二级动力模型。
Metal-organic framework MOF(Ni)-74 was synthesized by solvothermal method.The adsorption properties of MOF(Ni)-74 towards Cu2+ in aqueous solution was studied systematically.The phase and the adsorption property of the samples on Cu2+ were measured by X-ray powder diffraction and atomicabsorptionspectrophotometer.Batch adsorption studies were performed to investigate the effects of solution pH,initial solution concentration of Cu2+ and dosage of adsorbent on the adsorption of Cu2+ onto MOF(Ni)-74.The adsorption isotherms and adsorption kinetics were also studied.The experiment result shown that,the optimum pH was 6 for the adsorption of Cu2+ onto MOF(Ni)-74 in pH 1～6.The adsorption capacity of Cu2+ by MOF(Ni)-74 increased with the increase of the initial mass concentration of Cu2+.The removal rate of Cu2+ in solution increased with the addition of adsorbent,but the equilibrium adsorption amount of Cu2+ decreased.The adsorption model of Cu2+ onto MOF(Ni)-74 were complied with Freundlich isothermal adsorption model and quasi-second-order dynamic model.
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