以天然斜发沸石为研究对象,采用不同浓度的AlCl3和LaCl3对其进行调控。重点研究了调控沸石表面zeta电位与去除再生水中磷酸盐性能之间的关系。并运用SEM-EDS、XRD、比表面积与孔径分析等手段对经氯化镧调控后的沸石进行结构表征。结果表明,天然沸石经5g/L AlCl3、4g/L LaCl3、1g/L AlCl3与3 g/L LaCl3组合3种药剂调控处理后,颗粒表面zeta 电位由未调控前的-37.80mV 分别变为-33.33、-20.69、-30.96mV,再生水中磷酸盐的去除率由7.26%分别提高到12.55%、92.81%和55.56%；说明 AlCl3和 LaCl3调控后,沸石颗粒表面正电荷增多,表面zeta正电位增大,除磷性能也不同程度提高,且调控沸石除磷性能与 zeta 电位变化成正相关。经氯化镧调控后的沸石,形成了很多珊瑚状的表面结构,同时出现了较多微孔,比表面积与孔径分布也发生了很大变化。
Natural clinoptilolite were regulated by different cations at different ion concentrations.Relationship between zeta potential of regulated zeolite and its ability for removing phosphate was investigated.And SEM-EDS,XRD,specific surface area and pore analysis and other means were used to characterize the structure.The zeta potentials of zeolites regulated by 5g/L AlCl3 ,4g/L LaCl3 ,and 1g/L AlCl3 with 3g/L LaCl3 were-33.33,-20.69 and -30.96mV respectively,compared -37.80mV of natural zeolite,and their phosphate removal rates increased from 7.26% to 12.55%,92.81%,55.56% respectively.The ability of zeolite for remo-ving phosphate was found to be positive correlation with zeta potential increase.It could be inferred that AlCl3 and LaCl3 regulations transferred positive charges onto surface of zeolite which increased the zeta potentials of zeolite,therefore enhancing the abilities of zeolite for removing phosphate.Regulated zeolite of LaCl3 formed a lot of coral shaped surface structure,at the same time appeared more micro hole and specific surface area and pore size distribution also changed greatly.
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