Abstract
The gelatin/bentonite composite beads (Gel–Bent) were facilely prepared by compacting gelatin and bentonite and characterized using scanning electron microscopy, X-ray diffraction, fourier transform infrared spectra, thermogravimetric analysis and Zeta potential. The tunable adsorption property of Gel–Bent toward the anionic dye (congo red (CR)) and cationic dye (methylene blue (MB)) was investigated by changing the mass ratio of bentonite to gelatin. The effect of contact time, temperature and pH on the adsorption of CR and MB onto Gel-12.5%Bent (12.5% of Bent in amount of Gel) was investigated. Its selective adsorption property in the MB/CR binary system was evaluated under the co-presence of anionic surfactant SDS and inorganic salt NaCl at various pHs. Three isotherm models in linear and non-linear regressions, and two kinetic models were employed and assessed by various error functions. In addition, the swelling behavior of the composite beads was studied and the possible adsorption mechanism was also proposed. All the information indicated that Gel–Bent was expected to be a promising candidate for efficient removal of anionic and cationic dyes.
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