a b s t r a c tGelatin is a biodegradable, biocompatible, non-toxic, non-carcinogenetic and natural polymeric derivative of proteins and peptides. In this article, we applied gelatin as an eco-friendly biosorbent assay for removal of the Cr(VI). The behavior and cogency of gelatin as a biosorbent for interaction with Cr(VI) in aqueous solution was presented. The excellent adsorption properties of gelatin and modified gelatin were confirmed by measuring the capacity of Cr(VI). The batch adsorption model was applied as a function of time, adsorbent dosage, and pH to examine biosorbent's activity. Biosorbents showed an excellent adsorption capacity at pH 3.0. The maximum adsorption capacities was found to be 62.50 and 43.86 mg/g of modified and raw gelatin for Cr(VI) ion respectively. The applicability of Freundlich and Langmuir adsorption models were investigated for Cr(VI)-biosorbent interaction. Equilibrium data followed Langmuir adsorption isotherm excellently.
This study evaluates the application of Cr(VI) adsorption from the prepared synthetic solution by black sesame (Sesamum indicum L.) seed pulp (BSSP) and chitosan (Cts)-coated black sesame seed pulp beads (Cts-BSSP). BSSP and Cts-BSSP were used as an adsorbent without any chemical or physical treatment to remove Cr(VI) from an aqueous medium. The results indicated that the Cr(VI) removal was pH-dependent and reached an optimum at pH 2.0. It has been observed that the percentage of adsorption increased from 62% to 95% when the amount of Cts-BSSP increased from 0.0125 g to 0.0250 g. The required adsorbent amount for the maximum removal was 0.05 g and 0.1 g for Cst-BSSP and BSSP, respectively. The contact time for the adsorption was 120 min and 90 min for BSSP and Cst-BSSP, respectively. Scanning electron microscopy and Fourier transform infrared spectroscopy were used to explore the possible adsorption mechanism for Cr(VI). The equilibrium data for the BSSP and Cts-BSSP were used with the Langmuir and Freundlich adsorption isotherm models to assess the adsorption capacity and relevant mechanism. The adsorption capacity of the Cts-BSSP for Cr(VI) is relatively high compared to BSSP. The monolayer maximum adsorption capacities for Cr(VI) ions were 31.44 and 18.32 mg/g for Cts-BSSP and BSSP, respectively.
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