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Efficient Adsorption of Hydrogen Sulfide at Room Temperature Using Fumed Silica-supported Deep Eutectic Solvents

Category: Control Techniques and Strategy

Volume: 20 | Issue: 1 | Pages: 203-2015
DOI: 10.4209/aaqr.2019.10.0520
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To cite this article:
Mao, J., Ma, Y., Zang, L., Xue, R., Xiao, C. and Ji, D. (2020). Efficient Adsorption of Hydrogen Sulfide at Room Temperature Using Fumed Silica-supported Deep Eutectic Solvents. Aerosol Air Qual. Res. 20: 203-2015. doi: 10.4209/aaqr.2019.10.0520.

Jiaming Mao1, Yunqian Ma 1,2, Lihua Zang 1, Rong Xue1, Cong Xiao3, Dandan Ji1,2,4

  • 1 College of Environmental Science and Engineering, Qilu University of Technology (Shandong Academy of Science), Jinan 250353, China
  • 2 Jiangsu Key Laboratory of Anaerobic Biotechnology (Jiangnan University), Wuxi, 214122, China
  • 3 Shandong Huacheng Construction Design and Engineering Co., Ltd., Jinan 250301, China
  • 4 Huatai Group, Guangrao 257335, China

Highlights

  • Supported deep eutectic solvent could make the deposition of TAECuCl3 at nanoscale.
  • Supported deep eutectic solvent has high H2S removal efficiency.
  • The high utilization of activated site make deep eutectic solvent more economical.

Abstract

Supported deep eutectic solvents (SDESs) using fumed silica as the supporting material and TAECuCl3 as the loading substance, were developed for H2S removal. The highest breakthrough sulfur capacity, 9.97 mg g–1, was achieved when the molar ratio of the TEACl to the CuCl2 was 1:1, the loading rate of the DES was 10%, and the temperature was 30°C. TAECuCl3 proved to be a more effective loading substance than pure TEACl, pure CuCl2, or blends of these substances at other ratios. Due to the high utilization rates of the metal-activated sites, the SDESs were more economical. The excellent capacity for H2S removal was attributable to the formation of a thin layer of DES, nano-sized in thickness, on the fumed silica. The XRD and XPS analysis showed that the products of desulfurization were S and Cu2S, the latter of which was then oxidized to S and SO42– by air at room temperature. After regenerating 4 times, the breakthrough sulfur capacity of the SDESs was still as high as 7.39 mg g–1. The nonlinear curve fitting demonstrated that the adsorption kinetics followed those of the Bangham kinetic model.

Keywords

Hydrogen sulfide Adsorption Fumed silica Deep eutectic solvents


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