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

查看全文 作　　者：Dauda [1]Mohammed;Muhammad HAl-[1]Malack;Basheer [2]Chanbasha 高影响力作者 机构地区：[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高影响力机构 出　　处：《Chinese Journal of Chemical Engineering》索引2021年第34卷第5期,共13页高影响力期刊 基　　金：King Fahd University of Petroleum & Minerals (Dhahran, Saudi Arabia) for the technical and financial support provided;the Deanship of Scientific Research for the financial support through the project No: DF181034 摘　　要：Surface functionalization of blast furnace slag with sulfamic acid(a zwitterion)was performed for the removal of Cr^(3+)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℃ temperature,the prepared slag showed a removal efficiency of more than 90% for both Cr^(3+)and MB.Surface characterization by SEM/EDS,FTIR,XPS and surface area analyser,showed an improvement in surface properties and the incorporation of zwitterionic NH^(2+)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 negativeΔG(Gibb’s free energy)values.The prepared zwitterion slag offered easy regeneration with dilute HCl solution and showed a considerable removal(Cr^(3+):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
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