Soares da Silva, André Ribeiro

Pereira, José Fernandes

doi:10.1093/gao/9781884446054.article.t079439

Cited by 1 publication

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“…In the case of diclofenac or dipyrone, non-steroidal anti-inflammatory drugs, the interactions between amino groups of chitosan and carboxylic ones of diclofenac and sulfoxide ones of dipyrone are responsible for their adsorption. 21 The chemical modification of chitosan with acetylacetone and ethylenediamine allows pH adjustment to optimize the recovery conditions of diclofenac 22 and reduce the time necessary to its elimination to 45 minutes, compared with 80 minutes with non-modified chitosan. 23…”

Section: Drugsmentioning

confidence: 99%

Chitosan for wastewater treatment

Desbrières

Guibal

2017

Polymer International

163

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Chitosan (an amino-polysaccharide obtained from deacetylation of chitin, the major constituent of crustaceous shells and insect cuticles) presents a cationic character in acidic media allowing its dissolution, its shaping and possible ion-exchange interactions with anionic compounds (a property applied in adsorption and coagulation-flocculation processes). In neutral media, non-protonated amino groups allow complexation of metal cations or organic chemicals. These different properties explain the interest taken by the scientific community in using this biopolymer. In solution it contributes to complex metals and their recovery by complexation-assisted ultrafiltration. It can also be used to coagulate-flocculate organic compounds (as anionic dyes). In the solid state, it can be used for metal ion adsorption, as well as adsorption of organic compounds (dyes, pesticides, drugs, endocrine disruptors, etc.). The adsorption and coagulation-flocculation processes will be compared and examples considered. Moreover, it is noteworthy that the thermal degradation of this type of material is also more environmentally friendly than that of conventional synthetic resins (production of hazardous by-products, etc.), a supplementary advantage of these biopolymer-based sorbents. Combined with its ability to be chemically or physically modified improving the potential and phase separation of chitosan-based materials, all these properties mean it is an excellent candidate for wastewater treatment.

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Section: Drugsmentioning

confidence: 99%