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Author: search.filters.author.Kuncharam, Bhanu Vardhan ReddySubject: search.filters.subject.X-Ray diffraction (XRD)

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    Novel mixed matrix membranes with indium-based 2D and 3D MOFs as fillers and polysulfone for CO2/CH4 mixed gas separation
    (RSC, 2025-01) Kuncharam, Bhanu Vardhan Reddy
    To address the limitations of polymeric membranes, mixed matrix membranes for CO2 separation from biogas mixtures (CO2 and CH4) have been investigated utilizing various fillers. In this study, we investigated novel MMMs using 3D and 2D indium-based MOFs, MIL-68(In)–NH2 and In(aip)2, in a polysulfone polymer matrix. To confirm synthesis, both fillers were subjected to XRD and FTIR analysis, as well as FESEM characterization to assess their 2D and 3D structures. BET analysis revealed the pore size of MOFs. MMMs were characterized using XRD, FTIR, FESEM, and DSC to determine various membrane characteristics. MMMs were tested with CO2 : CH4 of 60 : 40 vol% to mimic the biogas mixture, and the CO2 permeability of 144 Barrer and 79.2 Barrer was obtained for 20 wt% In(aip)2/PSF membrane and 15 wt% MIL-68(In)–NH2/PSF membrane. The highest CO2/CH4 selectivities of 19.8 and 24.4 were obtained for 15 wt% MIL-68(In)–NH2/PSF MMM and 10 wt% In(aip)2/PSF MMM, respectively. The gas permeation findings of this study were compared with existing literature and long-term stability analysis was done to assess the performance of membranes for commercial standards.
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    Study of dual Filler Mixed Matrix Membranes with acid-functionalized MWCNTs and Metal-Organic Framework (UiO-66-NH2) in Cellulose Acetate for CO2 Separation
    (Springer, 2023-03) Kuncharam, Bhanu Vardhan Reddy
    Biogas upgradation is vital for enhancing its calorific value and reducing corrosion. Membrane-based CO2 separation is an alternative to conventional separation techniques. Polymer membranes such as cellulose acetate have low CO2 permeability. Mixed matrix membranes (MMMs), incorporating nanofillers, either single or dual, in a polymer matrix, are explored to enhance CO2 separation. This work investigates the CO2 separation from model biogas employing dual filler MMMs prepared using acid-functionalized multi-walled carbon nano-tubes (f-MWCNTs) and amine-functionalized metal-organic framework (UiO-66-NH2) as nanofillers and cellulose acetate (CA) as the polymer matrix. MMMs were fabricated by varying the f-MWCNTs loading from 0.01 wt% to 1 wt% with a constant loading of 10 wt% UiO-66-NH2. The morphology, chemical structure, and thermal stability were analyzed using scanning electron microscopy (FESEM), X-Ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), and thermo gravimetric analysis (TGA). The MMMs 0.01wt% f-MWCNTs@10wt%UiO-66-NH2/CA showed enhanced gas separation performance with CO2 permeability of 31.65 Barrer and CO2/CH4 selectivity of 16.78, compared to the base polymer (CO2 permeability of 6.44 Barrer and CO2/CH4 selectivity of 20.72) and single filler UiO-66-NH2 MMM (CO2 permeability of 10.18 Barrer and CO2/CH4 selectivity of 10.43). The permeability of 0.01wt% f-MWCNTs@10wt%UiO-66-NH2/CA is enhanced by 391% compared to the pure CA membrane and 210% compared to UiO-66-NH2/CA MMMs. A comparison was made with dual filler MMMs fabricated with non-functionalized MWCNTs and UiO-66-NH2, and it was observed that the acid-functionalized MWCNTs-based dual filler MMMs performed better.