A new adsorbent based on potassium carbonate (K2CO3) supported on modified γ-Al2O3 has been developed in this work. It has shown excellent multicycle stability with adsorption and regeneration at 55 and 130 °C, respectively. The support (γ-Al2O3) is stabilized by thermal treatment and alkali treatment with hydroxide, followed by calcination. The excellent regeneration characteristics are due to minimal interactions between the support and reactants during CO2 adsorption. This is due to acidity reduction of the support responsible for the formation of stable species, for example, KAl(CO3)2(OH)2. Various physicochemical characteristics have been studied to understand the adsorption and regeneration behavior of the adsorbents over multiple cycles. The effects of operating parameters, such as adsorption temperature, thermal dehydration of support material, and gas hourly space velocity (GHSV), during regeneration have also been studied. The CO2 adsorption capacities are found to be in the range of 2.3–2.6 mmol of CO2/g of adsorbent (10–11.4 wt % CO2), which also shows good stability after multicycle tests. The developed adsorbents also show high attrition resistance and, thus, can be effectively used in commercial application for CO2 capture.

Thermal Stability

Space velocity

Potassium hydroxide

Potassium carbonate

10.1021/ef501174m

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Investigation on the Mechanical Properties of TiO2/SiO2 Epoxy Hybrid Nanocomposites

Parvesh Kumar Haripada Bhunia J.S. Saini

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Failure Analysis of Double Pin- Loaded Holes in Glass Fibre Reinforced Polymer Composite Laminates

Paramdeep Singh Haripada Bhunia J.S. Saini

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UV activated monolithic graphene Oxide-Based adsorbents for dynamic CO2 Capture: Kinetic, isotherm and thermodynamic studies

Chemical Engineering Science (2023)

Ranjeet Kumar Jha Haripada Bhunia Soumen Basu

Endothermic process

Specific surface area

Chemisorption

10.1016/j.ces.2023.119572

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Photocatalytic Decolorization Kinetics and Mineralization of Reactive Black 5 Aqueous Solution by UV/TiO₂ Nanoparticles

CLEAN - Soil Air Water (2012)

Sandeep Kumar Sharma Haripada Bhunia Pratima Bajpai

Abstract The photocatalytic decolorization and mineralization of Reactive Black 5 (RB5) dye in presence of TiO 2 Degussa P25 has been studied using artificial light radiation in a shallow pond slurry reactor. The equilibrium adsorption of dye, influence of pH (3–11), catalyst load (0.5–3.0 g/L), and dye concentration (20–100 mg/L) on decolorization kinetics were studied. The effect of area to volume ratio of photoreactor on decolorization kinetics has been also studied. Mineralization studies were performed at optimized conditions of pH (3) and catalyst load (1.5 g/L). The maximum adsorption (26.5 mg/g) of dye was found to occur at pH 3. The apparent pseudo first order decolorization rate constant ( k app ) value followed the order pH 3 > pH 11 > pH 9 > pH 7. As compared to available literature reduction in total organic carbon (TOC) was minimal by the time there was complete decolorization. Initial reduction in TOC was followed by subsequent increasing trend till complete decolorization. Final decreasing trend in TOC was observed only after complete decolorization. Twelve hours of treatment under experimental conditions reduced TOC content by 70% only. Discussion of results suggest that photocatalytic treatment of colored effluent under low UV intensity, and low A / V ratio may result in completely decolorized effluent but still having high COD.

10.1002/clen.201100557

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Citations (39)