Preparation of nano-sized Mg-doped copper silicate materials using coal gangue as the raw material and its characterizat
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pISSN: 0256-1115 eISSN: 1975-7220
INVITED REVIEW PAPER
INVITED REVIEW PAPER
Preparation of nano-sized Mg-doped copper silicate materials using coal gangue as the raw material and its characterization for CO2 adsorption Yu Wu*,**, Zhaojun Wu*,**, Kai Liu*,**, Fu Li*,**, Yujie Pang*,**, Jianbin Zhang*,**,†, and Huayan Si**,***,† *College of Chemical Engineering, Inner Mongolia University of Technology, Hohhot 010051, China **Inner Mongolia Engineering Research Center for CO2 Capture and Utilization, Hohhot 010051, China ***School of Materials Science and Engineering, Hebei Provincial Key Laboratory of Traffic Engineering materials, Shijiazhuang Tiedao University, Shijiazhuang 050043, China (Received 29 March 2020 • Revised 17 May 2020 • Accepted 27 May 2020) AbstractThis work presents a simple method for the preparation of the Mg-doped nanocomposite copper silicates (Mgx-Cu1 x-SiO3) (x=0.25, 0.5, 0.75 and 0.9) using coal gangue waste as the silicon source for CO2 capture at low temperature. The as-prepared Mgx-Cu1x-SiO3 was systemically characterized by scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Brunauer-Emmett-Teller surface area analysis (BET). The results suggest that all Mgx-Cu1 x-SiO3 possess large surface areas, micropores and mesoporous structures composed of the agglomerates of small nanoparticles. They exhibit high CO2 adsorption capacity at 298.15 K under 1 bar, and that of Mg0.9-Cu0.1-SiO3 was the highest with the value of 16.73 cm3/g. The Freundlich isotherm model fits the CO2 adsorption isotherm well. Thermodynamic analysis indicates that the CO2 adsorption on Mg0.9-Cu0.1-SiO3 is exothermic (Ho
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