scholarly journals CO Adsorption Performance of CuCl/Activated Carbon by Simultaneous Reduction–Dispersion of Mixed Cu(II) Salts

Materials ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1605 ◽  
Author(s):  
Cailong Xue ◽  
Wenming Hao ◽  
Wenping Cheng ◽  
Jinghong Ma ◽  
Ruifeng Li
Keyword(s):  
Activated Carbon ◽  
Inductively Coupled Plasma ◽  
Co Adsorption ◽  
Optical Emission ◽  
Isosteric Heat ◽  
Cycle Performance ◽  
Emission Spectrometry ◽  
Separation And Purification ◽  
Monolayer Dispersion ◽  
Ideal Adsorbed Solution Theory

CO is a toxic gas discharged as a byproduct in tail gases from different industrial flue gases, which needs to be taken care of urgently. In this study, a CuCl/AC adsorbent was made by a facile route of physically mixing CuCl2 and Cu(HCOO)2 powder with activated carbon (AC), followed by heating at 533 K under vacuum. The samples were characterized by X-ray powder diffraction (XRD), inductively coupled plasma optical emission spectrometry (ICP-OES), N2 adsorption/desorption, and scanning electron microscopy (SEM). It was shown that Cu(II) can be completely reduced to Cu(I), and the monolayer dispersion threshold of CuCl on AC support is 4 mmol·g−1 AC. The adsorption isotherms of CO, CO2, CH4, and N2 on CuCl/AC adsorbents were measured by the volumetric method, and the CO/CO2, CO/CH4, and CO/N2 selectivities of the adsorbents were predicted using ideal adsorbed solution theory (IAST). The obtained adsorbent displayed a high CO adsorption capacity, high CO/N2, CO/CH4, and CO/CO2 selectivities, excellent ad/desorption cycle performance, rapid adsorption rate, and appropriate isosteric heat of adsorption, which made it a promising adsorbent for CO separation and purification.

Comparison of Analytical Techniques for Analysis of Arsenic Adsorbed on Carbon

2006 ◽  
Vol 41 (2) ◽  
pp. 185-189 ◽  
Author(s):  
Nirbhay Narayan Yadav ◽  
Saravanamuthu Maheswaran ◽  
Vaithiyalingam Shutthanandan ◽  
Suntharampillai Thevuthasan ◽  
Todd R. Hart ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Inductively Coupled Plasma ◽  
Ion Beam ◽  
Arsenic Concentration ◽  
Analytical Techniques ◽  
Optical Emission ◽  
Absorption Spectrometry ◽  
High Energy ◽  
Emission Spectrometry ◽  
Variable Surface

Abstract Activated carbon (AC) has been used extensively to treat arsenic-contaminated groundwater for a number of years. To date, attempts to quantify directly the amount of arsenic removed by the activated carbon using nondestructive methods has been limited. High-energy ion beam based proton induced x-ray emission (PIXE) is ideally suited to investigate the issues regarding the quantification of trace metals in solids. In this study, after the adsorption of arsenic on activated carbon, arsenic concentration in granular activated carbon (GAC) and powder activated carbon (PAC) were quantified using PIXE. The PIXE results were compared with atomic absorption spectrometry (AAS) and inductively coupled plasma optical emission spectrometry (ICP-OES) measurements. Some differences are observed between these measurements. The differences are greater in the case of GAC compared to PAC. These differences are mainly due to the inhomogeneous structure of GAC and PAC, which includes the variable surface properties such as surface area and pore sizes in each granule or particle. The larger differences are mainly due to the increased particle dimensions of GAC compared to PAC and the nature of the internal pore structure of GAC, which results in different amounts of arsenic adsorbed on different granules of GAC or even in different regions of one granule. This inhomogeneity of arsenic concentration is clearly visible in the arsenic concentration map generated for a single GAC particle using microbeam PIXE.

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