Adsorption of Pb(II) and Cu(II) metal ions on functionalized large-pore mesoporous silica

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• 作者：J.-Y. Lee ; C.-H. Chen ; S. Cheng ; H.-Y. Li
• 关键词：Adsorbent ; Functionalized silica ; Heavy metals ; Kinetics ; Morphology ; Surface complex
• 刊名：International Journal of Environmental Science and Technology
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：13
• 期：1
• 页码：65-76
• 全文大小：1,343 KB
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• 作者单位：J.-Y. Lee (1) (2)
  C.-H. Chen (2)
  S. Cheng (2)
  H.-Y. Li (1)
  
  1. Department of Chemical Engineering, National United University, Miaoli, 36003, Taiwan
  2. Department of Chemistry, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei, 10617, Taiwan
  
• 刊物主题：Environment, general; Environmental Science and Engineering; Environmental Chemistry; Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution; Soil Science & Conservation; Ecotoxicology;
• 出版者：Springer Berlin Heidelberg
• ISSN：1735-2630

文摘

Adsorption of copper and lead ions in aqueous solutions onto large-pore mesoporous silica materials functionalized with amino and mercapto groups and those with different morphologies including fiber-like, rod-like, and platelet was studied. The synthesized materials were characterized by techniques such as X-ray powder diffraction, nitrogen adsorption–desorption isotherms, scanning electron microscopy, and infrared spectra. Batch experiments were conducted to determine the adsorption processes. The equilibrium adsorption data agreed with Langmuir isotherms and revealed that four amino groups were required to form a stable surface complex with copper ions. Results indicated that initial adsorption rate onto platelet mesoporous adsorbent was rapid and faster than that of rod-like and fibrous morphologies due to its short channeling pores. Thiol-functionalized mesoporous silica adsorbents of all the morphologies have a better affinity for Pb2+ than the amino-mesoporous silica. In contrast, amino-mesoporous silica has a stronger affinity for Cu2+ compared to thiol-mesoporous silica. The optimal Pb2+ uptake on thiol-mesoporous silica was in solution with pH in 2–6, while the highest Cu2+ uptake on amino-mesoporous silica was at pH 5. Keywords Adsorbent Functionalized silica Heavy metals Kinetics Morphology Surface complex