CIESC Journal ›› 2018, Vol. 69 ›› Issue (9): 3944-3953.doi: 10.11949/j.issn.0438-1157.20180374

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Mechanism and model of dynamic adsorption of glyphosate contaminated water on graphene-based iron oxide composite

LI Yajuan1, ZHAO Chuanqi1, YANG Yuesuo1,2, WANG Yuanyuan1, SONG Xiaoming1   

  1. 1. College of Environment, Shenyang University, Shenyang 110044, Liaoning, China;
    2. College of Environment and Resources, Jilin University, Changchun 130021, Jilin, China
  • Received:2018-04-08 Revised:2018-06-19 Online:2018-09-05 Published:2018-07-09
  • Supported by:

    supported by the National Natural Science Foundation of China (41703120), Liaoning Innovation Team Project (LT201507) and the Doctoral Scientific Research Foundation (201601214).

Abstract:

Reduced graphene-based iron oxide composite was prepared via thermal chemical deposition method and used to remove glyphosate (GLY) contaminated water by a dynamic adsorption experiment. Influences of GLY concentration, solution pH, flow rate and filler bed height were analyzed. The dynamic adsorption mechanism was characterized by SEM-EDS, XPS and BET, as well as Thomas, Yoon-Nelson and Yan adsorption models. The results demonstrated that the glyphosate adsorptivity increased and the breakthrough time decreased with the increase of the initial glyphosate concentration, however, breakthrough time prolonged when increasing the adsorbent quality. In contrast, the glyphosate adsorptivity and the breakthrough time decreased with an increase in the pH value and flow rate. The fitting results matched Thomas, Yoon-Nelson and Yan model well, and the theoretical adsorption capacities were in close agreement with the experimental data. To study the dynamic adsorption process and the adsorption microscopic mechanism is of vital theoretical and practical significance for the popularization of graphene materials and the treatment of glyphosate contaminated water.

Key words: composites, glyphosate pollution, adsorption, breakthrough curve, model

CLC Number: 

  • X703.1

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