Enhanced adsorption of Cr(VI) from water by guar gum based composite hydrogels

Maity, Jayabrata; Ray, S. K.

doi:10.1016/j.ijbiomac.2016.04.036

Cited by 62 publications

(17 citation statements)

References 36 publications

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“…Aerwards, the suspensions were ltered on 0.45 mm-lter paper under vacuum, and the concentrations of NO 3 À and Cr(VI) in the ltrate were determined calorimetrically using a UV-Vis spectrophotometer (SHIMADZU UV-1640). The Cr(VI) concentrations were in the ltrate was measured at a maximum wavelength of 540 nm aer complexation with 1,5-diphenylcarbazide, 31,32 while the NO 3 À concentrations were measured at a wavelength adjusted to 415 nm and using the sodium salicylate method. 33 The pH was adjusted by adding small quantities of concentrated (0.1 M) HCl or NaOH solution.…”

Section: Adsorption Experimentsmentioning

confidence: 99%

Surface modification of biomaterials based on cocoa shell with improved nitrate and Cr(vi) removal

et al. 2020

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Section: Adsorption Experimentsmentioning

confidence: 99%

Surface modification of biomaterials based on cocoa shell with improved nitrate and Cr(vi) removal

et al. 2020

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“…The high ability of polymerized sorbents (especially polymerized clay deposit) to remove Cr(VI) from aqueous solutions may be explained by the strong basic nature and high ionization degree of the amine moiety, resulting in sites loaded with positive charges (≡N + ) being able to interact electrostatically with anionic forms of Cr(VI) [35]. Several studies have shown that enhancing adsorption capacity of various materials to remove negatively charged ions can be achieved by polymerization process [23,36]. In order to confirm the presence of Cr(VI) on the sorbents, FTIR analysis was conducted before and after the adsorption process (Figures 6 and 7).…”

Section: Removal Efficiency and Mechanismmentioning

confidence: 99%

Removal of Cr(VI) and Toxic Ions from Aqueous Solutions and Tannery Wastewater Using Polymer-Clay Composites

et al. 2017

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Polymer-clay composites were prepared by natural zeolite (clinoptilolite) or naturally local clay deposits in an N,N-methylene-bis-acrylamide as cross-linked. The resultant composites were used for the removal of Cr(VI) from an aqueous solution. Additionally, their effects on soluble ions of tannery wastewater were investigated. The produced composites were characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM). The results showed that Cr(VI) removal is dependent upon initial concentrations and pH. The adsorption quantity of Cr(VI) onto the polymerized clay deposit followed by polymerized zeolite exhibited higher values than their original samples. The polymer-clay composite of clay deposit showed the highest removal of 76.3-100% overall initial concentrations of 10-50 mg L −1 and at initial pH of 2. Kinetics of Cr(VI) removal by various sorbents was predicted using a pseudo-second order model. Our findings showed that the levels of salinity and various soluble ions (Cr 2+ , Na + , Cl − and SO 4 2− ) in tannery wastewater are very high, and their levels were reduced after treatment, especially by polymerized sorbents. It could be concluded that the polymer-clay composites may be employed as a highly efficient sorbent for the removal of Cr(VI) and toxic ions from the wastewater.

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“…Hence, adsorption using biopolymer-based composites has been described as one of the effective and promising techniques for removal of pollutants due to its simplicity, inexpensiveness, etc. [13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Amphoteric gellan gum-based terpolymer–montmorillonite composite: synthesis, swelling, and dye adsorption studies

Zauro

Vishalakshi

2017

Int J Ind Chem

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A terpolymer gel, Gellan gum-graft-poly(2-acrylamido-2-methyl-1-propanesulfonic acid-co-dimethylaminopropyl methacrylamide) and its composite with the clay, Montmorillonite, was prepared by free-radical polymerization and crosslinking reactions in solution. The terpolymer gel and the clay composite were characterized using FTIR, TGA, SEM, and X-ray diffraction techniques. Swelling studies were carried out in different pH and salt solutions. The gel showed maximum swelling capacity in alkaline medium, while the composite showed higher swelling in neutral medium. The swelling of the gel and the composite followed second kinetics model and water transport is found to be a less Fickian diffusion process. The terpolymer gel and the composite were evaluated for the adsorption of rhodamine B (RhB) and chromotrope 2R (C2R) dyes. Rhodamine B is found to be adsorbed to a higher extent than chromotrope 2R and the adsorption isotherm studies suggested that adsorption of both RhB and C2R on the terpolymer gel was best explained by Langmuir model, while the adsorption on the Composite fitted best into Freundlich model. Similarly, the adsorption kinetics data for both RhB and C2R dyes followed the second-order kinetics.

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Enhanced adsorption of Cr(VI) from water by guar gum based composite hydrogels

Cited by 62 publications

References 36 publications

Surface modification of biomaterials based on cocoa shell with improved nitrate and Cr(vi) removal

Surface modification of biomaterials based on cocoa shell with improved nitrate and Cr(vi) removal

Removal of Cr(VI) and Toxic Ions from Aqueous Solutions and Tannery Wastewater Using Polymer-Clay Composites

Amphoteric gellan gum-based terpolymer–montmorillonite composite: synthesis, swelling, and dye adsorption studies

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