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Green synthesis of hydrophilic activated carbon supported sulfide nZVI for enhanced Pb(II) scavenging from water: Characterization, kinetics, isotherms and mechanisms.

Authors
  • Qu, Jianhua1
  • Liu, Yang1
  • Cheng, Li1
  • Jiang, Zhao1
  • Zhang, Guangshan2
  • Deng, Fengxia3
  • Wang, Lei1
  • Han, Wei1
  • Zhang, Ying4
  • 1 School of Resources and Environment, Northeast Agricultural University, Harbin 150030, China. , (China)
  • 2 College of Resource and Environment, Qingdao Engineering Research Center for Rural Environment, Qingdao Agricultural University, Qingdao 266109, China. , (China)
  • 3 State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China. , (China)
  • 4 School of Resources and Environment, Northeast Agricultural University, Harbin 150030, China. Electronic address: [email protected] , (China)
Type
Published Article
Journal
Journal of hazardous materials
Publication Date
Aug 02, 2020
Volume
403
Pages
123607–123607
Identifiers
DOI: 10.1016/j.jhazmat.2020.123607
PMID: 32791481
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

For green synthesis of nZVI with low aggregation and high antioxidation, green tea extracts were explored as reductant during the synthesis with modification by hydrophilic porous activated carbon (HPAC) and sulfidation technology. Characterization results identified the effective preparation of porous activated carbon (PAC) with microporous and mesoporous characteristics, and the successful loading of S-nZVI nanoparticles on [email protected] Moreover, HPAC was identified to have a higher degree of hydrophilicity surface compared to PAC, while the S-nZVI with an atomic ratio of S/Fe (0.16) further improved the hydrophilic performance of [email protected] Batch adsorption revealed that the [email protected] possessed a pH-dependent adsorption performance with a fast kinetic equilibrium within 120 min and an outstanding Pb(II) binding of 295.30 mg/g at pH = 5.0 and 50 °C. Thermodynamic results exhibited positive ΔH° and ΔS°, clearly indicative of the endothermic property of Pb(II) uptake onto [email protected] with an increase in randomness, while the negative ΔG° uncovered a favorable and spontaneous process. Furthermore, the [email protected] was believed to enhance the Pb(II) uptake via the synergistic effects of electrostatic attraction, chemical precipitation, complexation and reduction. The results of this work highlighted the hydrophilic porous activated carbon supported sulfide nZVI for efficient remediation of Pb(II) contaminated water. Copyright © 2020 Elsevier B.V. All rights reserved.

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