摘要
以Ca(NO_(3))_(2)·4H_(2)O和(NH_(4))_(3)PO_(4)·3H_(2)O为原料,采用矿化法合成羟基磷灰石(HA)。通过X射线衍射、傅里叶变换红外光谱、扫描电子显微镜等表征HA的形貌与结构,并通过吸附实验探究合成时间、吸附时间、HA投加量、溶液pH值、F^(-)浓度以及共存阴离子、合成方法对HA除氟性能的影响。结果表明:在37℃下,合成5 d,所合成的HA除氟率最高。通过单因素实验得出,合成时间为5 d的HA对50 mL 10 mg·L^(-1) NaF的最优除氟条件为:吸附时间24 h、HA投加量0.040 g、溶液pH=7,此时HA除氟率高达99.26%;HA饱和吸附量可达72.88 mg·g^(-1)。HA吸附F^(-)过程符合准二级动力学方程,吸附等温线符合弗罗因德利希吸附等温模型。
Hydroxyapatite(HA)was synthesized through mineralization by using Ca(NO_(3))_(2)·4H_(2)O and(NH_(4))_(3)PO_(4)·3H_(2)O as raw materials.The morphology and structure of HA were characterized by XRD,SEM and FTIR.The effects of reaction time,adsorption time,HA dosage,solution pH value and concentration of fluoride ion on the de-fluoridation performance of HA were investigated.The results show that the synthesized HA has the highest fluorine removal efficiency when it is obtained by aging for 5 days at 37℃.According to the single factor experiment for 10 mg·L^(-1) sodium fluoride,the optimal fluorine removal efficiency is 99.26%under the optimal conditions of the above synthesized HA dosage 0.040 g,adsorption time 24 h,pH=7,and the saturated adsorption capacity can reach 72.88 mg·g^(-1).The defluorination process of HA conforms to the pseudo-second-order kinetic and the absorption isotherm is in conformity with the Freundlich isotherm model.
作者
朱丹琛
朱娟娟
郑炳云
ZHU Danchen;ZHU Juanjuan;ZHENG Bingyun(School of Environmental and Biological Engineering,Putian University,Putian Fujian 351100,China;Fujian Key Laboratory of Ecology-toxicological Effects&Control for Emerging Contaminants,Putian Fujian 351100,China;Key Laboratory of Ecological Environment and Information Atlas,Fujian Provincial University,Putian Fujian 351100,China)
出处
《莆田学院学报》
2022年第5期87-94,共8页
Journal of putian University
基金
福建省自然科学基金资助项目(2017J01710)
福建省教育厅A类项目(JAT200537)
福建省大学生创新创业训练计划项目(S202011498018)。
关键词
羟基磷灰石
吸附
氟离子
矿化法
hydroxyapatite
adsorption
fluoride ion
mineralization method
