Biosorption of Chromium (III) and Chromium (VI) by Untreated and Pretreated Cassia fistula Biomass from Aqueous Solutions |
| |
Authors: | Mazhar Abbas Raziya Nadeem Muhammad Nadeem Zafar Mamoona Arshad |
| |
Institution: | 1. Department of Chemistry, University of Agriculture, Faisalabad, 38040, Pakistan 3. Department of Analytical Chemistry, Lund University, P.O. Box 124, SE-221 00, Lund, Sweden 2. Bioprocess Technology Division, National Institute for Biotechnology and Genetic Engineering (NIBGE), Faisalabad, 577, Pakistan
|
| |
Abstract: | The present study explained the effect of pretreatments on the biosorption of Cr (III) and Cr (VI) by Cassia fistula biomass from aqueous solutions. For this purpose Cassia fistula biomass was pretreated physically by heating, autoclaving, boiling and chemically with sodium hydroxide, formaldehyde, gluteraldehyde, acetic acid, hydrogen peroxide, commercial laundry detergent, orthophosphoric, sulphuric acid, nitric acid, and hydrochloric acid. The adsorption capacity of biomass for Cr (III) and Cr (VI) was found to be significantly improved by the treatments of gluteraldehyde (95.41 and 96.21 mg/g) and benzene (85.71 and 90.81 mg/g) respectively. The adsorption capacity was found to depend on pH, initial metal concentration, dose, size, kinetics, and temperature. Maximum adsorption of both the Cr (III) and Cr (VI) was observed at pH 5 and 2. When Freundlich and Langmuir isotherms were tested, the latter had a better fit with the experimental data. The kinetic studies showed that the sorption rates could be described better by a second order expression than by a more commonly applied Lagergren equation. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|