| 温和条件下硝酸根型ZnAl-LDHs的合成与表征 |
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| 引用本文： | 刘芳,朱文凤,王林江,单展展,郭威敏.温和条件下硝酸根型ZnAl-LDHs的合成与表征[J].武汉理工大学学报,2012(1):12-15. |
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| 作者姓名： | 刘芳 朱文凤 王林江 单展展 郭威敏 |
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| 作者单位： | 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;桂林理工大学化学与生物工程学院 |
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| 基金项目： | 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) |
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| 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。
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| 关 键 词： | 锌铝水滑石 合成 共沉淀法 温和pH值 |
The Preparation and Characterization of ZnAl-LDHs at Mild pH Value |
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| LIU Fang,ZHU Wen-feng,WANG Lin-jiang,SHAN Zhan-zhan,GUO Wei-min.The Preparation and Characterization of ZnAl-LDHs at Mild pH Value[J].Journal of Wuhan University of Technology,2012(1):12-15. |
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| Authors: | LIU Fang ZHU Wen-feng WANG Lin-jiang SHAN Zhan-zhan GUO Wei-min |
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| Affiliation: | 1(1.Key Laboratory of Nonferrous Materials and New Processing Technology of Ministry of Education,Guilin University of Technology,Guilin 541004,China;2.School of Chemistry and Bioengineering,Guilin University of Technology,Guilin 541004,China) |
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| Abstract: | 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 ℃. |
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| Keywords: | ZnAl-LDHs synthesis coprecipitation method mild pH conditions |
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