Phenol Adsorption Mechanism of Organically Modified Bentonite and Its Microstructural Changes

Haijie He, Erpei Xu, Zhanhong Qiu, Tao Wu, Shifang Wang, Yuhua Lu and Guannian Chen
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Haijie He: College of Civil and Architectural Engineering, Taizhou University, Taizhou 318000, China
Erpei Xu: Zhengzhou University Multi-Functional Design and Research Academy Co., Ltd., Zhengzhou 450000, China
Zhanhong Qiu: College of Civil and Architectural Engineering, Taizhou University, Taizhou 318000, China
Tao Wu: College of Civil Engineering and Architecture, Jiangsu University of Science and Technology, Zhenjiang 212000, China
Shifang Wang: College of Civil and Architectural Engineering, Taizhou University, Taizhou 318000, China
Yuhua Lu: Fangyuan Construction Group Co., Ltd., Taizhou 318000, China
Guannian Chen: School of Civil and Environmental Engineering, Ningbo University, Ningbo 315211, China

Sustainability, 2022, vol. 14, issue 3, 1-11

Abstract: Bentonite was modified with cetyltrimethylammonium bromide (CTAB). The organically modified bentonite (OMB) was used to remove phenol from aqueous solution, the microstructural changes were characterized by X-ray diffraction (XRD) and scanning electronic microscopy (SEM), and phenol adsorption kinetic was obtained using batch adsorption test results. The results indicated that the rate of adsorption of phenol onto the OMB was positively correlated with the initial concentration, and the maximum adsorption capacity was found to be 10.1 mg/g at the initial concentration of 150 mg/L at 25 °C and pH 10. The investigations of adsorption kinetics models showed that the adsorption kinetic was better reflected by the pseudo-second-order kinetic model. Furthermore, the properties of the OMB samples with different adsorption times were obtained by SEM and XRD. The statistic analysis revealed that the pore diameter of the OMB samples decreased with the increasing adsorption time and gradually reached equilibrium.

Keywords: organically modified bentonite; adsorption; kinetics (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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