镁铁铝类水滑石的合成及去除V(Ⅴ)的研究  

Synthesis of MgFeAl-CO_3 layered double hydroxides and its performance on vanadate anion removal

作　　者：周宇淋 张佩聪[1] 倪师军[2] 黄艺[2] 邱克辉[1] 张文涛[1] 李峻峰[1] 张敏[1] 邓小波[1] 周敬修[1] 高庆[1] 满青青[1] ZhOU Yu-lin ZHANG Pei-cong NI Shi-jun HUANG Yi QIU Ke-hui ZHANG Wen-tao LI Jun-feng ZHANG Min DENG Xiao-bo ZH GAO Qing MAN Qing-qing(College of materials and Chemistry and Chemical Engineering, Chengdu University of Technology,Chengdu610059, China College of Earth Sciences,Chengdu University of Technology,Chengdu610059,China)

机构地区：[1]成都理工大学材料与化学化工学院材料科学与工程系,四川成都610059 [2]成都理工大学地球科学学院地球化学系,四川成都610059

出　　处：《化学研究与应用》2016年第11期1622-1627,共6页Chemical Research and Application

基　　金：科技部国际科技合作计划专项"攀枝花钒钛磁铁矿区钒污染治理的关系技术联合研究"(NO.2013DFA21690)

摘　　要：采用稳态共沉淀法合成了碳酸根插层的镁铁铝三元类水滑石,结合XRD、SEM等对合成样品进行了表征,重点研究了吸附时间、V(Ⅴ)初始浓度、污染液初始p H值等因素对水滑石去除V(Ⅴ)效果的影响。研究结果表明:合成的样品为Mg_(5.216)Fe_(1.456)Al_(1.400)(OH)_(16)(CO_3)_(1.424)·6.40H_2O(即MgFeAl-CO_3LDHs),片状晶体,片长50 nm^400 nm,片厚为15 nm^45 nm;1 g MgFeAl-CO_3LDHs对50m L浓度为45.15 mg/L的V(Ⅴ)污染液去除率为99.84%,且处理后V(Ⅴ)浓度为0.074 mg/L,远远低于钒工业污染物排放标准中最低浓度限0.3 mg/L;对V(Ⅴ)的吸附在热力学上更符合Langmuir方程,计算得饱和吸附量为18.56 mg/g;MgFeAl-CO_3LDHs不适宜在强碱性环境下去除V(Ⅴ)。In this paper,MgFeAl-CO3 layered double hydroxides was synthesized by constant coprecipitation method.The as-synthesized products were characterized by XRD,SEM analysis. The paper was mainly focused on studying the effects of initial vanadate concentration,contact time,and liquid initial p H valueon vanadateremoval by MgFeAl-CO3 layered double hydroxides.The results indicated that the as-synthesized sample was Mg5.216Fe1.456Al1.400（OH）16（CO3）1.424·6. 40H2O（ MgFeAl-CO3LDHs）,flaky crystal,length-diameter and thickness-diameter were 50 nm - 400 nm and 15 nm - 45 nm respectively.The removal rate reached 99. 84 percent in 50 m L solution at the initial vanadate concentration of 45. 51 mg / L with the adsorbent dosage of 1 g,vanadate anion concentration was 0. 074 mg / L after the adsorption,lower than the lowest concentration limit of 0. 3 mg / L by discharge standard of pollutants for vanadium industry.The equilibrium isotherm showed that the uptake of vanadate anion well agrees with the Langmuir equation,the saturated adsorption amount of MgFeAl-CO3 LDHs to vanadate anion was 18. 56 mg / g. Moreover,it showed adsorption of vanadate anion should avoid being used in alkaline.

关 键 词：镁铁铝三元类水滑石 V(Ⅴ) Langmuir方程吸附模型 

分 类 号：O614.22[理学—无机化学]