Phenol Red Adsorption from Aqueous Solution on the Modified Bentonite

Author:

My Linh Nguyen Le1,Duong Tran1,Van Duc Hoang1,Thi Anh Thu Nguyen1,Khac Lieu Pham2,Van Hung Nguyen3ORCID,Hoa Le Thi4,Quang Khieu Dinh4ORCID

Affiliation:

1. University of Education, Hue University, Hue 49000, Vietnam

2. Hue University, Hue 49000, Vietnam

3. Center for Chemistry Analysis, Dong Thap University, Cao Lãnh 81000, Vietnam

4. University of Sciences, Hue University, Hue 49000, Vietnam

Abstract

In the present work, the modified bentonites were prepared by the modification of bentonite with cetyltrimethylammonium bromide (CTAB), both cetyltrimethylammonium bromide and hydroxy-Fe cations and both cetyltrimethylammonium bromide and hydroxy-Al cations. X-ray diffraction (XRD), thermal analysis (TG-DTA), infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and nitrogen adsorption/desorption isotherms were utilized to characterize the resultant modified bentonites. The modified bentonites were employed for the removal of phenol red dye from aqueous solution. Phenol red adsorption agreed well with the pseudo-second-order kinetic model. The equilibrium data were analyzed on the basis of various adsorption isotherm models, namely, Langmuir, Freundlich, and Dubinin‒Radushkevich models. The highest monolayer adsorption capacity of phenol red at 30°C derived from the Langmuir equation was 166.7 mg·g−1, 125.0 mg·g−1, and 100.0 mg·g−1 for CTAB‒bentonite, Al‒CTAB‒bentonite, and Fe‒CTAB‒bentonite, respectively. Different thermodynamic parameters were calculated, and it was concluded that the adsorption was spontaneous (∆G° < 0) and endothermic (∆H° > 0), with increased entropy (∆S° > 0) in all the investigated temperature ranges.

Publisher

Hindawi Limited

Subject

General Chemistry

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