Solvent-free mechanochemical mild oxidation method to enhance adsorption properties of chitosan

Vakili, Mohammadtaghi; Qiu, Wen; Cagnetta, Giovanni; Huang, Jun; Yu, Gang

doi:10.1007/s11783-021-1416-4

Cited by 19 publications

(13 citation statements)

References 65 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…One can conclude that in the case of the mechanochemical treatment of peat with Na2CO3•1.5H2O2, the oxidation of carboxyl groups is more extensive and accompanied by their removal from the structure of organic matter. A similar effect was observed during the mechanochemical oxidation with Na2CO3•1.5H2O2 of chitosan, which is accompanied by deacetylation [67]. In addition, the alkaline component of Na2CO3•1.5H2O2 is also involved in the reaction, so the neutralization of acidic groups of HA occurs, which is reflected in the IR spectra (Figure 4).…”

Section: Adsorption Studies Of Cu(ii) On Natural and Modified Peatsupporting

confidence: 62%

Modification of Natural Peat for Removal of Copper Ions from Aqueous Solutions

Shvartseva

Skripkina

Gaskova

et al. 2022

Water

View full text Add to dashboard Cite

This study aimed at estimating peat adsorption properties for copper ion removal from aqueous solutions during peat modification. Two peat modifications have been studied using batch tests and quantitatively reproduced with instrumental analysis by using spectrometric, potentiometric, and thermodynamic modeling methods. The first variation—mechanical activation—was carried out in a planetary mill; for the second one—mechanochemical activation—dry sodium percarbonate (Na2CO3∙1.5H2O2) was added. The adsorption of copper ions was studied in the concentration range from 10–150 mg/L with an interaction time from 0.25–12 h. Both modifications led to significant changes in the interaction energy in the adsorption layer; thus, the acceptor properties of macromolecules were enhanced from natural peat to mechanically activated peat and mechanochemically activated peat. FTIR spectra, specific surface area characteristics, and sorption experiments show the predominantly chemical nature of copper sorption. Maximum adsorption capacity was determined to be 24.1, 42.1, and 16.0 mg/g for natural peat, mechanically activated peat, and mechanochemically activated peat, respectively. The example of peat mechanochemically oxidized with Na2CO3∙1.5H2O2 shows that the improvement in the physicochemical properties (CBET and specific surface area) plays a smaller role in the sorption capacity in relation to copper ions than the presence of phenolic and carboxyl groups, the content of which decreases during oxidation.

show abstract

Section: Adsorption Studies Of Cu(ii) On Natural and Modified Peatsupporting

confidence: 62%

Modification of Natural Peat for Removal of Copper Ions from Aqueous Solutions

Shvartseva

Skripkina

Gaskova

et al. 2022

Water

View full text Add to dashboard Cite

show abstract

“…PAO is an effective way to remove a variety of organic contaminants from soil, groundwater and sediment, of which persulfate activation is a crucial step. Thus far, many methods have been devised to activate persulfate, which have been extensively studied and identified with their pros and cons (Vakili et al, 2021). Compared with persulfate activation by alkali, transition metals and radiation, thermal activation and iron-/carbon-based activation are more environmentally friendly and cost-effective, being promising for field applications (Li et al, 2020;Ma et al, 2021).…”

Section: Principles Of Paomentioning

confidence: 99%

Integration of microbial reductive dehalogenation with persulfate activation and oxidation (Bio-RD-PAO) for complete attenuation of organohalides

Wang

2021

Front. Environ. Sci. Eng.

View full text Add to dashboard Cite

Due to the toxicity of bioaccumulative organohalides to human beings and ecosystems, a variety of biotic and abiotic remediation methods have been developed to remove organohalides from contaminated environments. Bioremediation employing organohalide-respiring bacteria (OHRB)-mediated microbial reductive dehalogenation (Bio-RD) represents a cost-effective and environmentally friendly approach to attenuate highly-halogenated organohalides, specifically organohalides in soil, sediment and other anoxic environments. Nonetheless, many factors severely restrict the implications of OHRB-based bioremediation, including incomplete dehalogenation, low abundance of OHRB and consequent low dechlorination activity. Recently, the development of in situ chemical oxidation (ISCO) based on sulfate radicals (SO 4 ·− ) via the persulfate activation and oxidation (PAO) process has attracted tremendous research interest for the remediation of lowly-halogenated organohalides due to its following advantages, e.g., complete attenuation, high reactivity and no selectivity to organohalides. Therefore, integration of OHRB-mediated Bio-RD and subsequent PAO (Bio-RD-PAO) may provide a promising solution to the remediation of organohalides. In this review, we first provide an overview of current progress in Bio-RD and PAO and compare their limitations and advantages. We then critically discuss the integration of Bio-RD and PAO (Bio-RD-PAO) for complete attenuation of organohalides and its prospects for future remediation applications. Overall, Bio-RD-PAO opens up opportunities for complete attenuation and consequent effective in situ remediation of persistent organohalide pollution.

show abstract

“…Fig 16. Experimental and fitted kinetics data for adsorption of BB41 with concentration of 8.0 mg•L -1 under optimum conditions…”

mentioning

confidence: 95%

“…Chitosan (CS) is a natural polysaccharide (Poly-β-(1→4)-D-glucosamine with randomly distributed N-acetyl-D-glucosamine units) can be obtained from chitin and has been considered for tackling the problem of contaminated water [14,15]. Although this bio-polymer has abundant functional groups, its application is limited by low adsorption capacity, inadequate hydrophilicity and poor recyclability [16]. Grafting and chemical cross-linking of chitosan is considered as a route to overcome the disadvantages of raw chitosan [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Magnetic Nanocomposites Containing Low and Medium-Molecular Weight Chitosan for Dye Adsorption: Hydrophilic Property Versus Functional Groups

Mirzai

Asadabadi

2021

J Polym Environ

View full text Add to dashboard Cite

The azo dye removal from polluted water is vital from a sustainable viewpoint. In this study, we investigated the influence of chitosan molecular weight on the adsorptive removal of basic blue 41. For preparing nanocomposite containing medium-molecular weight chitosan (NC(M)), cross-linking of chitosan was done using diethylenetriaminepentaacetic acid, silica-modified magnetite nanoparticles and graphene oxide. Techniques including FT-IR, XRD, FESEM, TGA/DTG, VSM and N2 adsorption/desorption isotherm were applied for characterization of NC(M). The adsorption behavior of synthesized NC(M) was compared with as-prepared adsorbent containing low-molecular weight chitosan (NC(L)) (Asadabadi 2021). The experimental design was carried out using the Central Composite Design. The effect of initial pH, temperature and adsorbent concentration on the percentage of dye removal were examined and the optimum values of variables were determined. Despite NC(M) which had maximum 31% dye removal, NC(L) led to approximately 95% adsorptive removal at optimum conditions. An increase in the monomer number of chitosan caused to reduce hydrophilic property of NC(M), which in turn resulted in a repulsion force between adsorbent and dye. However, H-bonding, coulumbic attraction and pi-stacking interactions contributed in the adsorption mechanism of NC(L). The kinetics study showed that about 30 min necessitated reaching the equilibrium and the rate-limiting steps changed from film diffusion to intraparticle diffusion as time passed. The kinetics data were satisfactorily fitted by the modified pseudo-n-order model.The maximum adsorption capacity of NC(L) was obtained 55.87 mg•g -1 . The modified Langmuir-Freundlich isotherm was the best model to reproduce data. NC(L) was recovered seven times without dramatic changes in its adsorption efficiency.

show abstract

Solvent-free mechanochemical mild oxidation method to enhance adsorption properties of chitosan

Cited by 19 publications

References 65 publications

Modification of Natural Peat for Removal of Copper Ions from Aqueous Solutions

Modification of Natural Peat for Removal of Copper Ions from Aqueous Solutions

Integration of microbial reductive dehalogenation with persulfate activation and oxidation (Bio-RD-PAO) for complete attenuation of organohalides

Magnetic Nanocomposites Containing Low and Medium-Molecular Weight Chitosan for Dye Adsorption: Hydrophilic Property Versus Functional Groups

Contact Info

Product

Resources

About