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Removal of diazo and triphenylmethane dyes from aqueous solutions through an adsorption process
Author(s) -
Sankar M,
Sekaran G,
Sadulla S,
Ramasami T
Publication year - 1999
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/(sici)1097-4660(199904)74:4<337::aid-jctb39>3.0.co;2-u
Subject(s) - adsorption , triphenylmethane , chemistry , aqueous solution , diazo , exothermic reaction , nuclear chemistry , organic chemistry , inorganic chemistry
Direct Red 31, Acid Black 1 and Acid Green 16 belonging to diazoand triphenylmethane classification of dye chemicals are widely usedduring the manufacture of leather. The spent dyestuffs in wastewaterescape biological treatment owing to their poor biodegradability. Anadsorption procedure was used in this study for the removal of dyesfrom aqueous solution using Rice Bran‐based Activated Carbon(RBAC). The molecular weight of the dye chemicals, the massof RBAC and the diameter of RBAC particle had positive effects on therate of adsorption. Initial concentration of dye chemicals, pH of thedye solution and temperature of adsorption showed a negative impacton adsorption. The enthalpies of adsorption for Direct Red 31, AcidBlack 1 and Acid Green 16 were −32.1,−23.4 and−21.7 KJ mol −1 respectively, indicating theadsorption was an exothermic physical process. The entropies ofadsorption for Direct Red 31, Acid Black 1 and Acid Green 16 were−96.94,−59.92 and −26.96 J K −1 mol −1 respectively, suggesting that RBAC favours theadsorption process. © 1999 Society of Chemical Industry