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Interactions between adsorbents and adsorbates in aqueous solutions

Authors
  • Wu, Zhijian1, 2
  • Ye, Xiushen1, 2
  • Liu, Haining1, 2
  • Zhang, Huifang1, 2
  • Liu, Zhong1, 2
  • Guo, Min1, 2
  • Li, Quan1, 2
  • Li, Jun1, 2
  • 1 Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, China , (China)
  • 2 Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, China , (China)
Type
Published Article
Journal
Pure and Applied Chemistry
Publisher
Walter de Gruyter GmbH
Publication Date
Aug 04, 2020
Volume
92
Issue
10
Pages
1655–1662
Identifiers
DOI: 10.1515/pac-2019-1110
Source
De Gruyter
Keywords
License
Yellow

Abstract

Adsorption is one of the most widely used processes in physicochemical operations. To design an adsorbent for a specific adsorbate, it is important to understand the interactions between adsorbents and adsorbates, which are very important for both adsorption capacity and selectivity. Electrostatic interactions, hydrogen bonding, hydrophobic interactions, complexation, and precipitation are comprehensively discussed. Adjusting solution pH and ionic strength is an effective method to improve the adsorption, especially when electrostatic and hydrophobic interactions are main interactions. With the increase in ionic strength, the hydrophobic interactions between adsorbents and adsorbates increase, while the electrostatic interactions decrease.

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