Adsorption Characteristics of Bixin on Acid- and Alkali-Treated Kaolinite in Aprotic Solvents.

Abstract:

:The adsorption of bixin in aprotic solvents onto acid- and alkali-treated kaolinite was investigated. Kaolinite was treated three times, for 6 h each, with 8 M HCl or 5 M KOH. The adsorbents were characterized by XRD, FT-IR, EDS, and BET-N2. The effects of contact time and dye concentration on adsorption capacity and kinetics, electronic transition of bixin before and after adsorption, and also mechanism of bixin-kaolinite adsorption were investigated. Dye adsorption followed pseudo-second order kinetics and was faster in acetone than in dimethyl carbonate. The best adsorption results were obtained for KOH-treated kaolinite. In both of the solvents, the adsorption isotherm followed the Langmuir model and adsorption capacity was higher in dimethyl carbonate (q m  = 0.43 mg/g) than in acetone (0.29 mg/g). The adsorption capacity and kinetics of KOH-treated kaolinite (q m  = 0.43 mg/g, k2 = 3.27 g/mg·min) were better than those of HCl-treated kaolinite (q m  = 0.21 mg/g, k2 = 0.25 g/mg·min) and natural kaolinite (q m  = 0.18 mg/g, k2 = 0.32 g/mg·min). There are shift in the band position of maximum intensity of bixin after adsorption on this adsorbent. Adsorption in this system seemed to be based essentially on chemisorption due to the electrostatic interaction of bixin with the strong basic and reducing sites of kaolinite.

journal_name

Bioinorg Chem Appl

authors

Rahmalia W,Fabre JF,Usman T,Mouloungui Z

doi

10.1155/2018/3805654

subject

Has Abstract

pub_date

2018-01-18 00:00:00

pages

3805654

eissn

1565-3633

issn

1687-479X

journal_volume

2018

pub_type

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