Mg(Zn)-Al(Fe)层状双氢氧化物磷酸根吸附性能研究  

Phosphate adsorption properties of Mg(Zn)-Al(Fe)layered double hydroxides

作　　者：陈艳玲 谷晓凤[1] 马文杰 兀晓文 粟智[1] CHEN Yan-ling;GU Xiao-feng;MA Wen-jie;WU Xiao-wen;SU Zhi(College of Chemistry and Chemical Engineering,Xinjiang Normal University,Urumqi 830054,China)

机构地区：[1]新疆师范大学化学化工学院,新疆乌鲁木齐830054

出　　处：《应用化工》2020年第7期1697-1701,1705,共6页Applied Chemical Industry

基　　金：国家自然科学基金项目(21763026);新疆维吾尔自治区青年博士科技项目(2018Q071);新疆维吾尔自治区研究生科研创新项目资助(XJ2019G222)。

摘　　要：采用共沉淀法合成Mg-Al-LDH、Mg-Fe-LDH和Zn-Al-LDH三类不同的层状双金属氢氧化物,系统研究其磷酸根吸附行为和影响因素。结果表明,Mg-Al-LDH对于磷酸根的饱和吸附量可达99.17 mg/g,吸附过程符合Langmuir模型和准二级动力学模型,弱酸性环境和金属阳离子的存在有利于磷酸根的吸附,而阴离子的加入则会抑制磷酸根的吸附。磷酸根在Mg-Al-LDH表面的吸附是静电吸引、化学吸附和阴离子插层共同作用的结果。The phosphate adsorption of Mg-Al,Mg-Fe and Zn-Al LDHs synthesized by coprecipitation method were studied,as well as the effects of different competitive anions and cations.The result showed that Mg-Al-LDH has excellent adsorption performance for phosphate,and the maximum adsorption capacity can reach 99.17 mg/g.The adsorption isotherm conforms to the Langmuir model,while the adsorption process primarily followed pseudo-second-order kinetic equation.The acidic environment and the addition of metal cations could improve the adsorption of phosphate.The addition of anions has a negative impact on the adsorption capacities of the LDHs.

关 键 词：层状双金属氢氧化物 磷酸根 吸附 动力学 影响因素 

分 类 号：TQ110.9[化学工程—无机化工]