Adsorption properties and mechanism of Pb2+, Cu2+ and Zn2+ by iron base zeolite-like geopolymer derived from copper slag
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Faculty of Chemical Engineering, Kunming University of Science and Technology

Clc Number:

X523

Fund Project:

The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

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    Abstract:

    Using copper slag as raw material, NaOH and industrial sodium silicate as alkaline activator, copper slag-based magnetic zeolite-like geopolymer (Fe3O4@GM) was prepared, and then use the as-obtained geopolymer to removal Pb2+, Cu2+ and Zn2+. The effects of initial pH, adsorbent dosage and initial concentration on the adsorption performance were investigated. Meanwhile, adsorption isotherm and adsorption kinetic were analyzed, the adsorption behavior of the F3O4@GM was studied, and the adsorption mechanism was assumed. Moreover, a series of characterizations were employed to analyze the physical and chemical properties of adsorbent, including XRD, FTIR, SEM, BET and XPS. This isothermal adsorption results show that the Langmuir model is more suitable than the Freundlich model to describe the adsorption behavior, and the adsorption capacities for Pb2+, Cu2+, Zn2+ can reach up to 555 mg/g, 489 mg/g and 125 mg/g, respectively. The adsorption process fits the pseudo-second-order kinetic model. The high specific surface area of F3O4@GM improves the adsorption properties of the materials. The adsorption mechanisms are associated with ion exchange, electrostatic attraction, surface complexation and pore fixation. Overall, the F3O4@GM can be used as an eco-friendly, desirable and economic adsorbent in heavy metal polluted water treatment, providing a cheap and convenient choice for the treatment of heavy metal pollution, and realizing the recycling and harmless treatment of copper slag.

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History
  • Received:February 16,2023
  • Revised:May 14,2023
  • Adopted:May 16,2023
  • Online: December 11,2023
  • Published:
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