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Removal of Zn 2+ from Aqueous Solution Using Biomass Ash and Its Modified Product as Biosorbent

Author

Listed:
  • Lei Xu

    (Henan Province Engineering Research Center of Environmental Laser Remote Sensing Technology and Application, Nanyang Normal University, Nanyang 473001, China
    Collaborative Innovation Center of Water Security for Water Source Region of Mid-Line of South-to-North Diversion Project of Henan Province, Nanyang Normal University, Nanyang 473001, China)

  • Xiangyu Xing

    (Non-Major Foreign Language Teaching Department, Nanyang Normal University, Nanyang 473061, China)

  • Jianbiao Peng

    (School of Environment, Henan Normal University, Xinxiang 453007, China)

Abstract

To study the removal effect of bottom ash of biomass power plants and its modified products on zinc (Zn 2+ ) in aqueous solution, a series of indoor experiments is carried out. The aim of this work is to explore a method to improve the ability of biomass ash to remove Zn 2+ from aqueous solution and obtain its adsorption characteristics of Zn 2+ in aqueous solution; on this basis, the feasibility of its application in the treatment of Zn 2+ -contaminated wastewater is analyzed. The mesoporous siliceous material is used to modify the biomass, and the modified material is functionalized with 3-aminopropyltriethoxysilane. The results show that the specific surface area of modified biomass ash is nine times that of the material before modification. The adsorption capacity of Zn 2+ on the material increases with the increase of pH, and pH 6 is the optimum pH to remove Zn 2+ from the aqueous solution. The Langmuir model and Freundlich model can show better fits for biomass ash and the modified material, respectively. Thermodynamic analysis results show that the adsorption of Zn 2+ is spontaneous and endothermic in nature. The adsorption of Zn 2+ onto biomass and modified biomass ash follow pseudo-first-order and pseudo-second-order kinetics, respectively.

Suggested Citation

  • Lei Xu & Xiangyu Xing & Jianbiao Peng, 2022. "Removal of Zn 2+ from Aqueous Solution Using Biomass Ash and Its Modified Product as Biosorbent," IJERPH, MDPI, vol. 19(15), pages 1-12, July.
    • Handle: RePEc:gam:jijerp:v:19:y:2022:i:15:p:9006-:d:870528
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