Physicochemical modification of chitosan adsorbent: a perspective

Francis, Asokogene Oluwadayo; Zaini, Muhammad Abbas Ahmad; Muhammad, Idris; Abdulsalam, Surajudeen; El-Nafaty, Usman Aliyu

doi:10.1007/s13399-021-01599-3

Cited by 30 publications

(17 citation statements)

References 119 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Chitosan has one –NH 2 group and two –OH groups in its glucosamine units [ 74 ], which facilitate its binding to metal ions by chelation in neutral solutions and by electrostatic attraction in acidic medium, respectively [ 75 ]. It has low price and high reactivity toward a variety of contaminants [ 76 ]. However, this natural polymer is unstable in pH < 4.0 solutions, which hinders its application [ 73 ].…”

Section: Polymers Used For Cr(vi) Removalmentioning

confidence: 99%

Advances in Sorptive Removal of Hexavalent Chromium (Cr(VI)) in Aqueous Solutions Using Polymeric Materials

Yuan

Luo

et al. 2023

Polymers

View full text Add to dashboard Cite

Sorptive removal of hexavalent chromium (Cr(VI)) bears the advantages of simple operation and easy construction. Customized polymeric materials are the attracting adsorbents due to their selectivity, chemical and mechanical stabilities. The mostly investigated polymeric materials for removing Cr(VI) were reviewed in this work. Assembling of robust functional groups, reduction of self-aggregation, and enhancement of stability and mechanical strength, were the general strategies to improve the performance of polymeric adsorbents. The maximum adsorption capacities of these polymers toward Cr(VI) fitted by Langmuir isotherm model ranged from 3.2 to 1185 mg/g. Mechanisms of complexation, chelation, reduction, electrostatic attraction, anion exchange, and hydrogen bonding were involved in the Cr(VI) removal. Influence factors on Cr(VI) removal were itemized. Polymeric adsorbents performed much better in the strong acidic pH range (e.g., pH 2.0) and at higher initial Cr(VI) concentrations. The adsorption of Cr(VI) was an endothermic reaction, and higher reaction temperature favored more robust adsorption. Anions inhibited the removal of Cr(VI) through competitive adsorption, while that was barely affected by cations. Factors that affected the regeneration of these adsorbents were summarized. To realize the goal of industrial application and environmental protection, removal of the Cr(VI) accompanied by its detoxication through reduction is highly encouraged. Moreover, development of adsorbents with strong regeneration ability and low cost, which are robust for removing Cr(VI) at trace levels and a wider pH range, should also be an eternally immutable subject in the future. Work done will be helpful for developing more robust polymeric adsorbents and for promoting the treatment of Cr(VI)-containing wastewater.

show abstract

Section: Polymers Used For Cr(vi) Removalmentioning

confidence: 99%

Advances in Sorptive Removal of Hexavalent Chromium (Cr(VI)) in Aqueous Solutions Using Polymeric Materials

Yuan

Luo

et al. 2023

Polymers

View full text Add to dashboard Cite

show abstract

“…109 to improve its thermal stability, mechanical properties, adsorption performance, and other characteristics. 110 Most of the chitosan-based aerogels currently used for oilwater separation are chemically modied to produce a ner and more uniform micro/mesoporous structure with a higher surface area. Generally speaking, the preparation process of chitosan-based aerogels is usually divided into four steps: droplet preparation, gel formation (crosslinking, chemical reaction), dissolution exchange, drying, and transformation into aerogels (freeze-drying, supercritical drying).…”

Section: Polysaccharidesmentioning

confidence: 99%

“…109 to improve its thermal stability, mechanical properties, adsorption performance, and other characteristics. 110…”

Section: Preparation Of Polysaccharide-based Aerogelsmentioning

confidence: 99%

Natural polysaccharide-based aerogels and their applications in oil–water separations: a review

Guo

2022

J. Mater. Chem. A

View full text Add to dashboard Cite

show abstract

“…However, the main challenge to the application of this biological support is its high solubility in most organic acids and dilute mineral solutions. This drawback can be overcome by chemical or physical modification via cross-linking agents, such as ethylene glycol diglycidyl ether, glutaraldehyde (GLA), epichlorohydrin, genipin, or triphosphate [31,34,35]. Among these agents, GLA is the most attractive, since it does not alter the adsorption capacity of chitosan [31].…”

Section: Introductionmentioning

confidence: 99%

“…Among these agents, GLA is the most attractive, since it does not alter the adsorption capacity of chitosan [31]. In addition to enhancing chemical stability, this cross-linking can improve both the mechanical and thermal stability of the chitosan [34,35].…”

Section: Introductionmentioning

confidence: 99%

Phyto-Assisted Assembly of Metal Nanoparticles in Chitosan Matrix Using S. argel Leaf Extract and Its Application for Catalytic Oxidation of Benzyl Alcohol

Taha

Da’na

2022

Polymers

View full text Add to dashboard Cite

The design and synthesis of eco-friendly solid-supported metal nanoparticles with remarkable stability and catalytic performance have gained much attention for both industrial and environmental applications. This study provides a novel, low-cost, simple, and eco-friendly approach for decorating cross-linked chitosan with gold nanoparticles (AuNPs), greenly prepared with Solenostemma argel (S. argel) leaf extract under mild conditions. Glutaraldehyde-modified chitosan beads were used to coordinate with Au(III) ions and act as stabilizing agents, and S. argel leaf extract was used as a cost-effective phyto-reducing agent to reduce gold ions to elemental Au nanoparticles. The successful cross-linking of chitosan with glutaraldehyde, the coordination of Au(III) ions into the chitosan matrix, and the phytochemical reduction of Au(III) to Au nanoparticles were investigated via FT-IR spectroscopy. The obtained Au nanoparticles have a uniform spherical shape and size <10 nm, as confirmed by both X-ray diffraction (XRD) (~8.8 nm) and TEM (6.0 ± 3 nm). The uniformity of the AuNPs’ size was confirmed by Scanning Electron Microscopy (SEM) and Transition Electron Microscopy (TEM). The powder X-ray diffraction technique showed crystalline AuNPs with a face-centered cubic structure. The elemental analysis and the Energy Dispersive Spectroscopy (EDS) analysis both confirmed the successful integration of Au nanoparticles with the chitosan network. The catalytic activity of this highly stable nanocomposite was systematically investigated via the selective oxidation of benzyl alcohol to benzaldehyde. Results showed a remarkable conversion (97%) and excellent selectivity (99%) in the formation of benzaldehyde over other side products.

show abstract

Physicochemical modification of chitosan adsorbent: a perspective

Cited by 30 publications

References 119 publications

Advances in Sorptive Removal of Hexavalent Chromium (Cr(VI)) in Aqueous Solutions Using Polymeric Materials

Advances in Sorptive Removal of Hexavalent Chromium (Cr(VI)) in Aqueous Solutions Using Polymeric Materials

Natural polysaccharide-based aerogels and their applications in oil–water separations: a review

Phyto-Assisted Assembly of Metal Nanoparticles in Chitosan Matrix Using S. argel Leaf Extract and Its Application for Catalytic Oxidation of Benzyl Alcohol

Contact Info

Product

Resources

About