温和条件下硝酸根型ZnAl-LDHs的合成与表征  

The Preparation and Characterization of ZnAl-LDHs at Mild pH Value

作　　者：刘芳[1] 朱文凤[1] 王林江[1] 单展展[2] 郭威敏[1] 

机构地区：[1]桂林理工大学有色金属及材料加工新技术教育部重点实验室,桂林541004 [2]桂林理工大学化学与生物工程学院,桂林541004

出　　处：《武汉理工大学学报》2012年第1期12-15,共4页Journal of Wuhan University of Technology

基　　金：国家自然科学基金(40972033);广西省自然科学基金(2010GXNFC013003);广西研究生教育创新计划项目(2009105960805M03)

摘　　要：以硝酸锌、硝酸铝、硝酸钠和氢氧化钠为原料,用共沉淀法制备了不同配比下的锌铝层状双金属氢氧化物(ZnAl-LDHs)。探讨了组分配比、合成方式、老化时间等对ZnAl-LDHs合成的影响。通过XRD、SEM、IR分析表征了合成的化合物。结果表明:与MgAl-LDH需要在碱性条件下合成的认识不同,ZnAl-LDHs可以在温和pH条件下(且不能在碱性条件下)合成。随着Zn/Al比的增加,合成的ZnAl-LDHs层间距增大,晶形越完整。当n(Zn)/n(Al)=2∶1,pH=6,老化时间为24h,晶化温度为70℃时,合成的ZnAl-LDHs结晶度好、纯度高。Zn-Al layered double hydroxides（ZnAl-LDHs） are prepared by coprecipitation method at mild pH condition,using Zn（NO3）2·6H2O,Al（NO3）3·9H2O,NaNO3 and NaOH as raw materials.The influence factors on the synthesis of ZnAl-LDHs including component ratio,synthetic methods,aging time were discussed.The products were characterized by XRD,SEM,IR.The results showed that ZnAl-LDHs can be synthesized under mild pH conditions（not in alkaline conditions）.This result is different from that of MgAl-LDH,which must be synthesized in alkaline conditions.The results also showed that the layer spacing of ZnAl-LDHs increased with the increase of Zn2＋/Al3＋,ration.The appropriate conditions for ZnAl-LDHs are Zn/Al ratio of 2∶1,pH value of 6,the ageing time of 24 hours and the crystallization temperature of 70 ℃.

关 键 词：锌铝水滑石 合成 共沉淀法 温和pH值 

分 类 号：TQ132.41[化学工程—无机化工]