化工进展2024，Vol.43Issue(6)：3199-3208,10.DOI:10.16085/j.issn.1000-6613.2023-0743
纳米球状LaAlO3的制备及其在酸性条件下的除氟性能
Preparation of nano-spherical LaAlO3 and its fluoride removal performance under acidic environment
摘要
Abstract
In order to solve the problem of synthesizing LaAlO3 crystalline phase with good surface properties by lowering the calcination temperature at lower pH for application in deep fluoride removal in wastewater(＜1.5mg/L),the nano-spherical perovskite LaAlO3 by co-precipitation hydrothermal method was prepared and the preparation factors affecting the surface properties of LaAlO3 was investigated.It was found by SEM,XRD,ICP-MS and BET that the formation of hydrothermal precursors of alkali carbonic acid precipitation can make Al3+and La3+precipitation more tightly bound and the optimal preparation conditions for LaAlO3 were obtained:co-precipitation pH=6,hydrothermal temperature=160℃and calcination temperature of 850℃.The behavior of F-adsorption by LaAlO3 was analyzed by static adsorption experiments and regeneration experiments systematically,and the results showed that LaAlO3 could achieve deep fluoride removal under acidic(pH＜3)conditions and the fluoride removal rate reached 93.22%at pH=2.The adsorption process conformed to the Langmuir adsorption isotherm model and pseudo-second-order kinetic model,which was a chemical monolayer adsorption with exothermic reaction.Under the condition of initial fluorine concentration of 200mg/L,the adsorption capacity of LaAlO3 adsorption reached 53.8mg/g in 8min and the equilibrium adsorption capacity reached 66.5mg/g in 4h.By using alum as desorbent,LaAlO3 can maintain more than 90%of the original fluoride removal rate after 4 cycles with excellent regeneration performance and high utilization value.关键词
LaAlO3/含氟废水/深度除氟/吸附剂/纳米双金属氧化物Key words
LaAlO3/fluorinated wastewater/deep defluorination/adsorbent/nano bimetallic oxides分类
资源环境引用本文复制引用
刘京都,余关龙,龙志奇,周璐,包璞瑞,滕骏毅,杜春艳..纳米球状LaAlO3的制备及其在酸性条件下的除氟性能[J].化工进展,2024,43(6):3199-3208,10.基金项目
湖南省教育厅重点项目(21A0188) （21A0188）
湖南省环境保护河湖疏浚污染控制工程技术中心开放基金(EPD202104) （EPD202104）
湖南省自然科学基金(2021JJ30728,2022JJ30616). （2021JJ30728,2022JJ30616）
