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Nharingo, T., Moyo, M., Mahamadi, C.. (1394). Kinetics and Equilibrium Studies on the Biosorption of Cr (VI) by Vigna Subterranean (L.) Verdc Hull. , 10(1), 85-96. doi: 10.22059/ijer.2016.56891
T. Nharingo; M. Moyo; C. Mahamadi. "Kinetics and Equilibrium Studies on the Biosorption of Cr (VI) by Vigna Subterranean (L.) Verdc Hull". , 10, 1, 1394, 85-96. doi: 10.22059/ijer.2016.56891
Nharingo, T., Moyo, M., Mahamadi, C.. (1394). 'Kinetics and Equilibrium Studies on the Biosorption of Cr (VI) by Vigna Subterranean (L.) Verdc Hull', , 10(1), pp. 85-96. doi: 10.22059/ijer.2016.56891
Nharingo, T., Moyo, M., Mahamadi, C.. Kinetics and Equilibrium Studies on the Biosorption of Cr (VI) by Vigna Subterranean (L.) Verdc Hull. , 1394; 10(1): 85-96. doi: 10.22059/ijer.2016.56891

Kinetics and Equilibrium Studies on the Biosorption of Cr (VI) by Vigna Subterranean (L.) Verdc Hull

International Journal of Environmental Research
مقاله 10، دوره 10، شماره 1، اردیبهشت 2016، صفحه 85-96    اصل مقاله (1.63 M)
نوع مقاله: Original Research Paper
شناسه دیجیتال (DOI): 10.22059/ijer.2016.56891
نویسندگان
T. Nharingo* 1؛ M. Moyo2؛ C. Mahamadi3
1Midlands State University, Zimbabwe
2Midlands State Univercity, Zimbabwe
3Bindura University of Science Education, Zimbabwe
چکیده
The Vigna Subterranean (L.) Verdc hull’s (VSVH) potential to remove Cr(VI) ions from aqueous solutions was investigated. The biosorbent was characterised by FTIR, SEM-EDX and XRF before and after exposure to Cr(VI). The surface comprised of phenolic, carboxylate, sulphonate, carboxyl, ammines, silica, silanol, phosphite esters, alkyl and hydroxyl functional groups responsible for Cr(VI) removal. Batch experiments were carried out in erlenmeyer flasks to optimize pH, contact time, biosorbent dosage and initial concentration of Cr(VI) ions. Reutilization of biosorbent was investigated using predetermined and optimized 0.14 M H2SO4. The initial and residual total chromium concentrations were estimated by FAAS. The optimum pH, contact time and biosorbent dosage were found to be 2, 180 minutes and 3 g/L respectively. The data generated from the effect of contact time and initial Cr(VI) concentration was subjected to kinetics and isotherm modelling respectively. The kinetic data fitted the pseudo first order model (R2 = 0.9334) and the sorption mechanism was diffusion controlled with both film and intra particle diffusion involved in the rate limiting step. The isotherm study confirmed favourable monolayer sorption best described by Langmuir model (R2 = 0.9986) with a very high monolayer sorption capacity of 232.5581 ± 0.9 mg/g. The Temkin model confirmed the endothermicity and weak ion-exchange nature of the Cr(VI)-biosorbent interactions that are important for biosorbent reuse. The biosorbent was recycled three times without significant loss of sorption-desorption capability. VSVH powder provides a renewable and reusable alternative for simple and effective Cr(VI) removal from wastewaters worth exploring for commercial-industrial application.
کلیدواژه‌ها
Bio-reduction؛ Cr(VI)؛ Intra-particle Diffusion؛ Kinetics؛ Reutilization
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