Adsorption of Dibenzothiophene in Gasoline by Si-MCM-41/Sodium Alginate Porous Hybrid Membrane

Qiao Jing Lin,Wei Wei Lin,Jian Hua Chen,Xue Sun,Jing Mei Wang,Li Jun Fang

doi:10.37358/rc.22.1.8504

Abstract

In this paper, the novel Si-MCM-41/SA porous hybrid membrane was prepared by in-corporating inorganic mesoporous material Si-MCM-41 into sodium alginate (SA) matrix, then cross-linking with 5% glutaraldehyde and 1.0 mol/L hydrochloric acid. Using scanning electron microscope (SEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA) and atomic force microscope (AFM), the prepared Si-MCM-41 sample and Si-MCM-41/SA porous hybrid membrane were characterized. The adsorption kinetics of the dibenzothiophene (DBT) by the Si-MCM-41/SA porous hybrid membrane was explored. Meanwhile, the effects of Si-MCM-41 content, porogen addition amount, DBT concentration, solution temperature, toluene concentration and other factors on the adsorption property of the Si-MCM-41/SA porous hybrid membrane were studied. In addition, the selectivity and reusability of the Si-MCM-41/SA porous hybrid membrane were also explored. The results show that the Si-MCM-41/SA porous hybrid membrane has excellent adsorption capacity for DBT, reaching 350.74 mg/g, which is a great improvement over the pure SA membrane. Moreover, among three sulfides of thiophene, 3-methylthiophene and DBT, the Si-MCM-41/SA porous hybrid membrane has the highest adsorption selectivity for DBT. The Si-MCM-41/SA porous hybrid membrane can be reused at least 5 times. Therefore, it can be known that the Si-MCM-41/SA porous hybrid membrane is an ideal adsorption material with practical application prospects.

Highlights

With the gradual deterioration of the world’s environmental and the need for social sustainability development, the sulfur content of gasoline has attracted the attention of researchers and enterprises around the world
A large amount of SiMCM-41 is loaded on the Si-MCM-41/sodium alginate (SA) porous hybrid membrane, and it has more pores with large diameters, which is conducive to the transfer of thiophene sulfides to the interior of the Si-MCM-41/SA porous hybrid membrane for adsorption [24, 25]
The experiment results indicate that the adsorption capacity of Si-MCM-41/SA porous hybrid membrane for DBT were greatly affected by the Si-MCM-41 content, porogen addition, solution temperature, solution concentration, toluene concentration and adsorption time

Summary

Introduction

With the gradual deterioration of the world’s environmental and the need for social sustainability development, the sulfur content of gasoline has attracted the attention of researchers and enterprises around the world. The industry urgently needs to develop a new desulfurization method or high efficiency adsorbent to carry out deep desulfurization [3]. The key point of adsorption desulfurization (ADS) technology is the preparation of high efficiency adsorbents. In the synthesis of mesoporous material-41(Si) (Si-MCM-41) [2,17-20], cetyl ammonium bromide is needed as the template, and the removal of the template in the post-treatment process leads to its regular pore structure. It has large pore size (1.5-10 nm), high specific surface area (over 700m2/g) and high adsorption capacity, which has the properties required for the adsorption material [21]. The adsorption of DBT on Si-MCM-41/SA porous hybrid membranes was investigated by optimizing the preparation and experimental conditions

Materials and methods

Results and discussions

Conclusions