Biosorption of cationic dyes by Pará chestnut husk (Bertholletia excelsa)

Abstract

Pará chestnut husk (Bertholletia excelsa) (PCH), an agro-industrial waste largely generated in Brazil, was employed as a low-cost and efficient biosorbent to remove the cationic dyes Crystal Violet (CV) and Methylene Blue (MB) from aqueous media. PCH presented an amorphous structure containing carboxylic acids, esters, ketones and aldehydes on the surface. Non-porous and irregular particles were also observed. For both dyes, the biosorption capacity was favored under acid conditions. Equilibrium was attained within 40 min at 25 °C with a PCH dosage of 0.5 g L. The biosorption kinetic curves were satisfactory explained by the pseudo-first-order model. The Freundlich model was best for representing the equilibrium curves. The maximum biosorption capacities were 83.6 and 83.8 mg g for CV and MB, respectively. PCH was efficient for treating a simulated textile effluent containing several dyes and chemicals, achieving a color removal of 90%. In this way, PCH can be considered as an option for treating colored effluents containing textile dyes.

Kinetics of peroxide bleaching of azorubin in the presence of polyaniline-mangane oxide composite (IV)

“…Сьогодні багато дослідників займаються розробкою альтернативних до активованого вугілля адсорбуючих матеріалів, охоплюючи побічні продукти сільського господарства, природні глини та полімери [9][10][11][12], які становлять унікальний клас адсорбентів завдяки їхній пористій структурі, здатності до зв'язування, високої адсорбційної здатності та хорошої механічної, хімічної та термічної стабільності [13].…”

A utilização de resíduos agroindustriais para adsorção do corante azul de metileno: uma breve revisão / The use of agro-industrial waste for adsorption of the blue dye of methylene: a brief review

“…Dentre esses métodos, evidencia-se o processo de adsorção, que consiste na remoção dos contaminantes pela interação com algum material adsorvente, sendo um processo eficaz e de fácil manuseio. Em relação aos adsorventes mais aplicados, há as zeólitas, materiais porosos à base de polímeros e o carvão ativado, sendo este o mais utilizado em virtude da sua elevada área superficial (GONÇALVES et al, 2007;GEORGIN et al, 2018;SILVA et al, 2019).…”

Polyacrylamide-Grafted Actinidia deliciosa peels powder (PGADP) for the sequestration of crystal violet dye: isotherms, kinetics and thermodynamic studies

“…Adsorbents utilized for dye removal should be characterized by an excellent adsorption capacity derived fundamentally from the combination of pore structure and surface chemistry (Pang et al 2019). Recent literature survey revealed that various adsorbents have been employed in the treatment of dye-polluted waters includes clay minerals (Kausar et al 2018), zeolites (Sivalingam and Sen 2019), polymer composite (Jayasantha Kumari et al 2017), fly ash (Gao et al 2015) and reduced the cost of adsorption process various biomasses have been suggested as dye adsorbents: rice husks (Franco et al 2015), grape wastes (Vanni et al 2017), ouricuri fibers (Meili et al 2017) and para chestnut husk (Georgin et al 2018).…”