首页> 中文期刊> 《中南大学学报》 >粉煤灰微波碱熔辅助水热合成沸石及其对水溶液中Cd(II)的强化吸附作用

粉煤灰微波碱熔辅助水热合成沸石及其对水溶液中Cd(II)的强化吸附作用

         

摘要

针对传统水热法合成沸石存在碱熔温度高、反应时间长的问题,提出了一种新的粉煤灰微波碱熔辅助水热合成沸石的方法,并将沸石产品用于吸附水溶液中的Cd(II)。其合成工艺是将粉煤灰与氢氧化钠混合物置于微波箱式高温反应器中以450°C反应15min,碱熔产物加水在常温下磁力搅拌4h,再在90°C下静置12h,过滤、洗涤、干燥得到沸石产品。采用X射线衍射分析、扫描电镜分析、红外光谱分析、比表面积分析和zeta电位分析表征吸附剂。结果表明:合成的沸石为八面沸石,含量约为93%,比表面积为75.72m2/g,pHzpc为3.80。从水溶液中去除Cd(II),优化的吸附剂用量为0.5g/L,pH6,吸附时间为90min,初始浓度为20mg/L。在此条件下,Cd(II)的去除率达98.55%。Cd(II)在沸石表面的吸附符合伪二级动力学模型,Langmuir等温吸附模型比Freundlich模型、Dubinin-Radushkevich模型和Temkin模型更适合于描述等温吸附过程,最大的Cd(II)吸附量为86.96mg/g。热力学计算表明:Cd(II)在合成沸石表面的吸附为自发、吸热过程。

著录项

  • 来源
    《中南大学学报》 |2018年第1期|P.9-20|共12页
  • 作者单位

    [1]College of Materials and Metallurgy, Guizhou University, Guiyang 550025, China;

    [2]Mining College, Guizhou University, Guiyang 550025, China;

    [3]National & Local Joint Laboratory of Engineering for Effective Utilization of Regional Mineral Resources from Karst Areas, Guiyang 550025, China;

    [2]Mining College, Guizhou University, Guiyang 550025, China;

    [3]National & Local Joint Laboratory of Engineering for Effective Utilization of Regional Mineral Resources from Karst Areas, Guiyang 550025, China;

    [4]Guizhou Key Lab of Comprehensive Utilization of Non-metallic Mineral Resources Guiyang 550025, China;

    [2]Mining College, Guizhou University, Guiyang 550025, China;

    [3]National & Local Joint Laboratory of Engineering for Effective Utilization of Regional Mineral Resources from Karst Areas, Guiyang 550025, China;

    [4]Guizhou Key Lab of Comprehensive Utilization of Non-metallic Mineral Resources Guiyang 550025, China;

    [2]Mining College, Guizhou University, Guiyang 550025, China;

    [3]National & Local Joint Laboratory of Engineering for Effective Utilization of Regional Mineral Resources from Karst Areas, Guiyang 550025, China;

    [4]Guizhou Key Lab of Comprehensive Utilization of Non-metallic Mineral Resources Guiyang 550025, China;

    [2]Mining College, Guizhou University, Guiyang 550025, China;

    [3]National & Local Joint Laboratory of Engineering for Effective Utilization of Regional Mineral Resources from Karst Areas, Guiyang 550025, China;

    [4]Guizhou Key Lab of Comprehensive Utilization of Non-metallic Mineral Resources Guiyang 550025, China;

    [2]Mining College, Guizhou University, Guiyang 550025, China;

    [3]National & Local Joint Laboratory of Engineering for Effective Utilization of Regional Mineral Resources from Karst Areas, Guiyang 550025, China;

    [4]Guizhou Key Lab of Comprehensive Utilization of Non-metallic Mineral Resources Guiyang 550025, China;

    [2]Mining College, Guizhou University, Guiyang 550025, China;

    [3]National & Local Joint Laboratory of Engineering for Effective Utilization of Regional Mineral Resources from Karst Areas, Guiyang 550025, China;

    [4]Guizhou Key Lab of Comprehensive Utilization of Non-metallic Mineral Resources Guiyang 550025, China;

    [2]Mining College, Guizhou University, Guiyang 550025, China;

    [3]National & Local Joint Laboratory of Engineering for Effective Utilization of Regional Mineral Resources from Karst Areas, Guiyang 550025, China;

    [4]Guizhou Key Lab of Comprehensive Utilization of Non-metallic Mineral Resources Guiyang 550025, China;

  • 原文格式 PDF
  • 正文语种 CHI
  • 中图分类 用作吸附剂的人造硅酸盐;
  • 关键词

    微波; 粉煤灰; 合成沸石; 吸附; Cd(II);

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