Category: pyrazoles-derivatives. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: Sodium 6-hydroxy-5-((2-methoxy-5-methyl-4-sulfonatophenyl)diazenyl)naphthalene-2-sulfonate, is researched, Molecular C18H14N2Na2O8S2, CAS is 25956-17-6, about Chitosan hydrogel scaffold modified with carbon nanotubes and its application for food dyes removal in single and binary aqueous systems. Author is Goncalves, Janaina Oliveira; da Silva, Keli Arruda; Rios, Estefani Cardillo; Crispim, Marselle Martins; Dotto, Guilherme Luiz; de Almeida Pinto, Luiz Antonio.
This work developed one promising adsorbent based on chitosan hydrogel scaffold modified with carbon nanotubes, for food dye removal in single and binary aqueous systems. The modified hydrogel scaffold was characterized in relation to the gel strength, swelling degree, surface attributes, and IR spectrum. Adsorption isotherms were performed using dyes, food red 17 (FdR17) and food blue 1 (FdB1), in single and binary aqueous systems. The exptl. data were adjusted to the Langmuir model and the thermodn. parameters were estimated The kinetic behavior was evaluated and, desorption studies were performed to verify the reuse capacity of the modified hydrogel scaffold. The results showed that maximum adsorption capacities were of 1508 and 1480 mg g-1 for the single system and of 955 and 902 mg g-1 for the binary system, for FdB1 and FbR17, resp. The thermodn. parameters indicated that the adsorption was the spontaneous, exothermic and favorable process. The model that best represented the kinetic data was that of Avrami. In desorption, the adsorbent can be used until four times and maintaining the adsorption capacity of the adsorbent in 71% of the initial capacity.
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Reference:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics