SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2021, Vol. 33 ›› Issue (5): 306-318.DOI: 10.1016/j.cjche.2020.08.047

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Sulfamic acid functionalized slag for effective removal of organic dye and toxic metal from the aqueous samples

Dauda Mohammed1, Muhammad H. Al-Malack1, Basheer Chanbasha2   

  1. 1 Department of Civil and Environmental Engineering, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia;
    2 Department of Chemistry, King Fahd University of Petroleum & Minerals, Dhahran 31262, Saudi Arabia
  • Received:2020-03-26 Revised:2020-08-03 Online:2021-08-19 Published:2021-05-28
  • Contact: Dauda Mohammed
  • Supported by:
    The authors would like to express their gratitude to King Fahd University of Petroleum & Minerals (Dhahran, Saudi Arabia) for the technical and financial support provided. CB thank the Deanship of Scientific Research for the financial support through the project No:DF181034.

Sulfamic acid functionalized slag for effective removal of organic dye and toxic metal from the aqueous samples

Dauda Mohammed1, Muhammad H. Al-Malack1, Basheer Chanbasha2   

  1. 1 Department of Civil and Environmental Engineering, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia;
    2 Department of Chemistry, King Fahd University of Petroleum & Minerals, Dhahran 31262, Saudi Arabia
  • 通讯作者: Dauda Mohammed
  • 基金资助:
    The authors would like to express their gratitude to King Fahd University of Petroleum & Minerals (Dhahran, Saudi Arabia) for the technical and financial support provided. CB thank the Deanship of Scientific Research for the financial support through the project No:DF181034.

Abstract: Surface functionalization of blast furnace slag with sulfamic acid (a zwitterion) was performed for the removal of Cr3+ and methylene blue dye (MB) from water samples. The slag functionalization process was optimized using Response Surface Methodology Design. Statistical analysis of the parameters that include the sulfamic acid amount (A), reaction time (B), and temperature (C) revealed that (A) increase had a negative effect on the adsorption of both pollutants by the zwitterion slag, whereas (B) and (C) increase presented a positive impact. At the optimum condition of 2 g sulfamic acid amount, 50 min reaction time and 37 C temperature, the prepared slag showed a removal efficiency of more than 90% for both Cr3+ and MB. Surface characterization by SEM/EDS, FTIR, XPS and surface area analyser, showed an improvement in surface properties and the incorporation of zwitterionic NH2+ and S=O groups of sulfamic acid. Adsorption isotherm and kinetic studies conducted with the zwitterion slag showed the adsorption process was suited to Freundlich isotherm model and pseudo-second-order kinetic model. The thermodynamic study conducted revealed the spontaneity of the process based on the calculated negative ΔG (Gibb’s free energy) values. The prepared zwitterion slag offered easy regeneration with dilute HCl solution and showed a considerable removal (Cr3+: 65% and MB: 80%) for both pollutants even after 3 cycles of usage.

Key words: Functional groups, Optimization, Zwitterion, Adsorption, Waste treatment, Industrial waste

摘要: Surface functionalization of blast furnace slag with sulfamic acid (a zwitterion) was performed for the removal of Cr3+ and methylene blue dye (MB) from water samples. The slag functionalization process was optimized using Response Surface Methodology Design. Statistical analysis of the parameters that include the sulfamic acid amount (A), reaction time (B), and temperature (C) revealed that (A) increase had a negative effect on the adsorption of both pollutants by the zwitterion slag, whereas (B) and (C) increase presented a positive impact. At the optimum condition of 2 g sulfamic acid amount, 50 min reaction time and 37 C temperature, the prepared slag showed a removal efficiency of more than 90% for both Cr3+ and MB. Surface characterization by SEM/EDS, FTIR, XPS and surface area analyser, showed an improvement in surface properties and the incorporation of zwitterionic NH2+ and S=O groups of sulfamic acid. Adsorption isotherm and kinetic studies conducted with the zwitterion slag showed the adsorption process was suited to Freundlich isotherm model and pseudo-second-order kinetic model. The thermodynamic study conducted revealed the spontaneity of the process based on the calculated negative ΔG (Gibb’s free energy) values. The prepared zwitterion slag offered easy regeneration with dilute HCl solution and showed a considerable removal (Cr3+: 65% and MB: 80%) for both pollutants even after 3 cycles of usage.

关键词: Functional groups, Optimization, Zwitterion, Adsorption, Waste treatment, Industrial waste