A bifunctional adsorbent with high surface area and cation exchange property for synergistic removal of tetracycline and Cu2+

Yan Ma, Qing Zhou, Sicong Zhou, Wei Wang, Jing Jin, Jiawen Xie, Aimin Li, Chendong Shuang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

99 Citations (Scopus)

Abstract

A novel bifunctional adsorbent with high surface area and cation exchange character (HAR-2) was prepared via copolymerization and hydrolysis reactions for the coremoval of tetracycline and Cu2+. HAR-2 possessed large specific surface area of 394m2/g and high weak cation exchange capacity of 1.06meq/g. The adsorption kinetics of TC or Cu2+ fitted both pseudo-first-order and pseudo-second order equations in single-substrate solution, whereas the adsorption kinetics were better described by pseudo-second order model in binary solutions. The adsorption of TC was an exothermic process, while the Cu2+ adsorption process was endothermic. The adsorption isotherms of TC and Cu2+ fitted the Langmuir model, suggesting a monolayer adsorption process. The adsorbed amount of TC was pronouncedly enhanced in the presence of Cu2+ due to the formation of tertiary surface complex HAR-Cu2+-TC. Likewise, the adsorption of Cu2+ was significantly improved by forming HAR-TC-Cu2+ complex in the presence of TC. The uptake of Cu2+ increased as pH increased, while the adsorbed amount of TC increased as pH rose from 2 to 3 but decreased when pH was further elevated from 3 to 6. The presence of NaCl exerted no significant influence on the adsorption of TC and negatively affected the adsorption of Cu2+. HAR-2 exhibited high stability over 5 repeated uses, only losing 6.3% and 18.4% of the initial adsorption capacity for TC and Cu2+, respectively.

Original languageEnglish
Pages (from-to)26-33
Number of pages8
JournalChemical Engineering Journal
Volume258
DOIs
Publication statusPublished - 15 Dec 2014
Externally publishedYes

Keywords

  • Bifunctional adsorbent
  • Cation exchange
  • Combined pollution
  • Copper
  • High surface area
  • Tetracycline

ASJC Scopus subject areas

  • General Chemistry
  • Environmental Chemistry
  • General Chemical Engineering
  • Industrial and Manufacturing Engineering

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