کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
584574 | 1453184 | 2007 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Removal of chromium(VI) from water and wastewater by using riverbed sand: Kinetic and equilibrium studies
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
بهداشت و امنیت شیمی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Cr(VI) is a priority pollutant and has been documented to be harmful to fauna, flora and human beings and chromium containing water and wastewater are hazardous. Removal of Cr(VI) by adsorption on a non-toxic natural substance, riverbed sand has been investigated. A maximum removal of 74.3% was noted at 0.50 Ã 10â4 M concentration of Cr(VI) in solution. Kinetic and equilibrium studies of Cr(VI) removal have been carried out. Chemical analysis of the adsorbent revealed SiO2 to be its major component. Kinetic data of adsorption was fitted by Lagergreen's model and kad, the rate constant of adsorption, was found be maximum 2.69 Ã 10â2 minâ1 at 25 °C with minimum at 35 °C. Values of coefficients of intra-particle diffusion and mass transfer have been determined at different values of temperature. Langmuir's model has been used for equilibrium studies and the constants have been calculated. The studies conducted show the process of Cr(VI) removal to be exothermic in nature.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hazardous Materials - Volume 142, Issues 1â2, 2 April 2007, Pages 449-454
Journal: Journal of Hazardous Materials - Volume 142, Issues 1â2, 2 April 2007, Pages 449-454
نویسندگان
Y.C. Sharma, C.H. Weng,