Sonochemical surface functionalization of exfoliated LDH:effect on textural properties, CO2 adsorption, cyclic regeneration capacities and subsequent gas uptake for simultaneous methanol synthesis

Ezeh, Collins I., Huang, Xiani, Yang, Xiaogang, Sun, Cheng-Gong and Wang, Jiawei (2017). Sonochemical surface functionalization of exfoliated LDH:effect on textural properties, CO2 adsorption, cyclic regeneration capacities and subsequent gas uptake for simultaneous methanol synthesis. Ultrasonics Sonochemistry, 39 , pp. 330-343.

Abstract

To improve CO2 adsorption, amine modified Layered double hydroxide (LDH) were prepared via a two stage process, SDS/APTS intercalation was supported by ultrasonic irradiation and then followed by MEA extraction. The prepared samples were characterised using Scanning electron microscope-Energy dispersive X-ray spectroscopy (SEM-EDX), X-ray Photoelectron Spectroscopy (XPS), X-ray diffraction (XRD), Temperature Programmed Desorption (TPD), Brunauer-Emmett-Teller (BET), and Thermogravimetric analysis (TGA), respectively. The characterisation results were compared with those obtained using the conventional preparation method with consideration to the effect of sonochemical functionalization on textural properties, adsorption capacity, regeneration and lifetime of the LDH adsorbent. It is found that LDHs prepared by sonochemical modification had improved pore structure and CO2 adsorption capacity, depending on sonic intensity. This is attributed to the enhanced deprotonation of activated amino functional groups via the sonochemical process. Subsequently, this improved the amine loading and effective amine efficiency by 60% of the conventional. In addition, the sonochemical process improved the thermal stability of the adsorbent and also, reduced the irreversible CO2 uptake, CUirrev, from 0.18 mmol/g to 0.03 mmol/g. Subsequently, improving the lifetime and ease of regenerating the adsorbent respectively. This is authenticated by subjecting the prepared adsorbents to series of thermal swing adsorption (TSA) cycles until its adsorption capacity goes below 60% of the original CO2 uptake. While the conventional adsorbent underwent a 10 TSA cycles before breaking down, the sonochemically functionalized LDH went further than 30 TSA cycles.

Publication DOI: https://doi.org/10.1016/j.ultsonch.2017.04.041
Divisions: Engineering & Applied Sciences
Engineering & Applied Sciences > Polymer and advanced materials research group
Engineering & Applied Sciences > European Bioenergy Research Institute (EBRI)
Additional Information: © 2017, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ Funding: Zhejiang Provincial Natural Science Foundation (LY15B060001); Ningbo Key Research Project (1012B10042); Ningbo Education Bureau; University of Nottingham; and EPSRC (Grant no. EP/G037345/1).
Uncontrolled Keywords: adsorption,CO capture,layered double hydroxide,regeneration,ultrasound,Chemical Engineering (miscellaneous),Radiology Nuclear Medicine and imaging,Acoustics and Ultrasonics
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Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
Published Date: 2017-11
Authors: Ezeh, Collins I.
Huang, Xiani
Yang, Xiaogang
Sun, Cheng-Gong
Wang, Jiawei ( 0000-0001-5690-9107)

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