Adsorption desulfurization performance of PdO/SiO2@graphene oxide hybrid aerogel: Influence of graphene oxide

Jiacheng Xu; Bo Zhang; Yongkang Lu; Leigang Wang; Wanyi Tao; Xiao Teng; Wensheng Ning; Zekai Zhang

doi:10.1016/j.jhazmat.2021.126680

Adsorption desulfurization performance of PdO/SiO₂@graphene oxide hybrid aerogel: Influence of graphene oxide

J Hazard Mater. 2022 Jan 5:421:126680. doi: 10.1016/j.jhazmat.2021.126680. Epub 2021 Jul 20.

Authors

Jiacheng Xu¹, Bo Zhang², Yongkang Lu¹, Leigang Wang¹, Wanyi Tao¹, Xiao Teng¹, Wensheng Ning¹, Zekai Zhang¹

Affiliations

¹ Laboratory of Industrial Catalysis, College of Chemical Engineering, Zhejiang University of Technology, 18 Chaowang Road, Hangzhou 310014, China.
² Laboratory of Industrial Catalysis, College of Chemical Engineering, Zhejiang University of Technology, 18 Chaowang Road, Hangzhou 310014, China. Electronic address: zb10006093@zjut.edu.cn.

PMID: 34332481
DOI: 10.1016/j.jhazmat.2021.126680

Abstract

Preparation of PdO/SiO₂@graphene oxide (GO) hybrid aerogels were carried out sol-gel method combined with atmospheric drying technology to study their adsorption performance for thiophenics and compared with PdO/SiO₂. Scanning electron microscope (SEM), N₂ adsorption-desorption isotherms, X-ray diffraction (XRD) analysis, X-ray photoelectron spectroscopy (XPS), and fourier transformation infrared spectroscopy (FT-IR) for samples were performed. The adsorption performance of PdO/SiO₂@GO for thiophene were better than that of PdO/SiO₂, attributed to that incorporation of GO increased the specific surface area and the Pd incorporation rate, where Pd²⁺ ions acted as the π-complexation and sulfur-metal (SM) bond adsorption active centers, as well as GO adsorbed thiophene by the π-π stacking effect. The adsorption capacities of PdO/SiO₂@GO-1.0 for thiophene (TH), benzothiophene (BT) and dibenzothiophene (DBT) were 8.89, 9.3 and 12.6 mg-S/g_ads, respectively. The addition of GO in aerogels could improve the inhibition effect of toluene, cyclohexene and pyridine while decreased the inhibition effect of MTBE and H₂O for the adsorption of thiophene, due to the π-π stacking effect and the hydrophobicity of GO, respectively. The adsorption process was spontaneous and exothermic, be well fitted by the apparent second-order kinetic model and dominated by chemical interaction. Pd/SiO₂@GO-1.0 had a good solvent elution regeneration performance.

Keywords: Aerogel; Desulfurization; Graphene oxide; Thiophene; π-π stacking effect.