Adsorption of hexavalent chromium by graphite–chitosan binary composite

Dongre, Rajendra S.

doi:10.1007/s12034-016-1200-4

Cited by 8 publications

(4 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The second one comes from the exchange of the arsenate ion species with the water molecules [23]. A spectrum of the sample after chromate adsorption has a characteristic peak on 1382 cm -1 which has a bit stronger intensity, so it means that physisorption has occurred [24]. The vibration of the Se-O chemical bonds may be found in FTIR spectra at 822, 328, 856 and 411 cm -1 [25].…”

Section: Resultsmentioning

confidence: 99%

Application of raw volcanic rock found in Etna valley as an adsorbent of chromates, arsenates and selenates

et al. 2018

View full text Add to dashboard Cite

This paper aims to determine the potential of volcanic rock found in Etna valley as an adsorbent of heavy metals in anionic form (chromates, arsenates, and selenates). Characterization of the volcanic rock was done with chemical methods (AAS, AES, gravimetric analysis, XRF), physicochemical methods (XRD, FTIR, SEM, DTA, DTG) and physical methods (porosity measurement, Microscopy in transmitted light). Also, equilibrium adsorption capacity was determined. All the results of adsorption capacity were satisfying considering the mineral composition, granulation, and porosity. The removal efficiency of chromates was the biggest (above 30 %) with adsorption capacity of 15.6 mg Cr g-1. The lowest adsorption efficiency was with the selenates, approximately 18 %.

show abstract

Section: Resultsmentioning

confidence: 99%

Application of raw volcanic rock found in Etna valley as an adsorbent of chromates, arsenates and selenates

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Chitosan acts as a natural adsorbent due to free amino and hydroxyl groups responsible for adsorptive interactions with water pollutants like dyes [29], metals [30][31][32][33], and organic compounds, etc. Functionality of chitosan is facile for modifications, viz., cross-linking and grafting so as to enhance its inherent absorption efficiency and specificity.…”

Section: Chitosan In Water Treatmentmentioning

confidence: 99%

“…Functionality of chitosan is facile for modifications, viz., cross-linking and grafting so as to enhance its inherent absorption efficiency and specificity. Cross-linking of chitosan's functionality improved its sorption efficiency at low pH while grafting with sulfur/ nitrogen improves specificity and capacity for heavy metals [30][31][32][33]. Dye adsorption by unmodified chitosan is good; but its low stability prompted researchers to modify/graft at amino, carboxyl, sulfur, and alkyl groups.…”

Section: Chitosan In Water Treatmentmentioning

confidence: 99%

“…Metal cations are chelated specifically at protonated amines in acidic conditions whereas anions by electrostatic interactions. Chitoneous adsorptive interaction includes partition, diffusion, chelation, trapping, scavenging, cation exchange, hydrogen bonding, Van der waals force, dipole-dipole, and electrostatic interactions [29][30][31][32][33]. Quaternary tetra-alkylammoniumchitosans own permanent +ve charge at -OH/NH 2 to boost antimicrobial activity (at wide pH) in orthopedic, wound dressing in surgery, anion exchange cartridge, dental implants, colorimetric analysis, and perchlorate removal of water [9,20].…”

Section: Chitosan In Water Treatmentmentioning

confidence: 99%

See 1 more Smart Citation

Marine Polysaccharides in Medicine

Dongre¹

2017

Biological Activities and Application of Marine Polysaccharides

View full text Add to dashboard Cite

About 70% of the Earth's surface is covered with seawater and 90% biosphere wraps maximum biodiversity that offers resourceful novel bio-molecules. Marine species are enriched with organic compounds viz. terpenoids, polyethers/ketides, lipo-glycoproteins, peptides and polysaccharides that act as cell surface receptors and involve in cell development/differentiation, besides being antimicrobial agents. Algae, sponge and fish have various defense mechanisms developed via specific/potent natural molecules to survive under hostile, extreme conditions such as various degrees of salinity, pressure, temperature, darkness, besides microbial and viral attacks. Marine seaweeds and algae enriched with polysaccharides such as glycosaminoglycans, agar, alginate and chitin/ chitosan owing to their diversified significance have received growing attention among researchers. Currently, marine-derived biomolecules cater 20% market drug load while other natural products bear 30% share. Chitins exhibit various biological and physicochemical properties that can be exploited in biotechnology and medicine/drug, cosmetic, food and textile industries. This chapter focuses on chitin/chitosan production, its physicochemical characterization and biological activities and relationship between its chemical structure and bio-activity, including chemical modification reactions such as acylation, substitution, sulfonation and other cross-linking strategies applied to skeletal modification with the recently updated literature.

show abstract

Biopolymer‐Based Nanocomposites for Removal of Cr(VI) from Aqueous Systems: A Review

Shukla

Garg

et al. 2023

CLEAN Soil Air Water

View full text Add to dashboard Cite

Hexavalent chromium Cr(VI) has emerged as a contaminant of prime concern for the environmentalists because of its improper disposal by tannery, dye, and electroplating industries. Adsorption is the most exploited method for its removal from industrial wastewater because of its high removal efficiency even at low Cr(VI) concentration, minimal sludge, and ease of regeneration. In recent years, several adsorbents of biological origin such as plants, algae, fungi, and bacteria have been explored for Cr(VI) remediation. This review comprehends the recent studies involving usage of biopolymer‐based nano‐composites with respect to its adsorption mechanisms, adsorption capacities, isotherms, and kinetics. The conventional abiotic and biotic techniques for removal of Cr(VI) are also discussed with a comparative insight of their adsorption capacity and removal efficiency. Nano‐biocomposites integrate the functional properties of both nanoparticles and biopolymers, which make them efficient biosorbents. Nano‐biocomposites offer a large surface area, reduced particle loss, minimal particle agglomeration on the surface, and high stability. Common kinetic models among the nano‐biocomposites, and various equilibrium models are also analyzed to understand the mode of adsorption and associated factors. These materials are mostly found to follow monolayer adsorption with ion exchange, electrostatic interaction, and surface complexation as major players in the process.

show abstract

Adsorption of hexavalent chromium by graphite–chitosan binary composite

Cited by 8 publications

References 36 publications

Application of raw volcanic rock found in Etna valley as an adsorbent of chromates, arsenates and selenates

Application of raw volcanic rock found in Etna valley as an adsorbent of chromates, arsenates and selenates

Marine Polysaccharides in Medicine

Biopolymer‐Based Nanocomposites for Removal of Cr(VI) from Aqueous Systems: A Review

Contact Info

Product

Resources

About