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   Adsorptive Removal of Copper by Using Surfactant Modified Laterite Soil  
   
نویسنده pham t.d. ,nguyen h.h. ,nguyen n.v. ,vu t.t. ,pham t.n.m. ,doan t.h.y. ,nguyen m.h. ,ngo t.m.v.
منبع journal of chemistry - 2017 - دوره : 2017 - شماره : 0
چکیده    Removal of copper ion (cu2+) by using surfactant modified laterite (sml) was investigated in the present study. characterizations of laterite were examined by x-ray diffraction (xrd),fourier transform infrared spectroscopy (ft-ir),inductively coupled plasma mass spectrometry (icp-ms),and total carbon analysis. the optimum conditions for removal of cu2+ by adsorption using sml were systematically studied and found as ph 6,contact time 90 min,adsorbent dosage 5 mg/ml,and ionic strength 10 mm nacl. the equilibrium concentration of copper ions was measured by flame atomic absorption spectrometry (f-aas). surface modification of laterite by anionic surfactant sodium dodecyl sulfate (sds) induced a significant increase of the removal efficiency of cu2+. the surface modifications of laterite by preadsorption of sds and sequential adsorption of cu2+ were also evaluated by xrd and ft-ir. the adsorption of cu2+ onto sml increases with increasing nacl concentration from 1 to 10 mm,but at high salt concentration this trend is reversed because desorption of sds from laterite surface was enhanced by increasing salt concentration. experimental results of cu2+/sml adsorption isotherms at different ionic strengths can be represented well by a two-step adsorption model. based on adsorption isotherms,surface charge effects,and surface modification,we suggest that the adsorption mechanism of cu2+ onto sml was induced by electrostatic attraction between cu2+ and the negatively charged sml surface and nonelectrostatic interactions between cu2+ and organic substances in the laterite. © 2017 tien duc pham et al.
آدرس faculty of chemistry,vnu-university of science,vietnam national university-hanoi,19 le thanh tong,hoan kiem,hanoi, Viet Nam, faculty of chemistry,vnu-university of science,vietnam national university-hanoi,19 le thanh tong,hoan kiem,hanoi, Viet Nam, faculty of chemistry,vnu-university of science,vietnam national university-hanoi,19 le thanh tong,hoan kiem,hanoi, Viet Nam, faculty of chemistry,vnu-university of science,vietnam national university-hanoi,19 le thanh tong,hoan kiem,hanoi, Viet Nam, faculty of chemistry,vnu-university of science,vietnam national university-hanoi,19 le thanh tong,hoan kiem,hanoi, Viet Nam, faculty of chemistry,vnu-university of science,vietnam national university-hanoi,19 le thanh tong,hoan kiem,hanoi, Viet Nam, faculty of chemistry,vnu-university of science,vietnam national university-hanoi,19 le thanh tong,hoan kiem,hanoi, Viet Nam, thai nguyen university of education,thai nguyen university,20 luong ngoc quyen,quang trung,thai nguyen, Viet Nam
 
     
   
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