Adsorption studies of carbon dioxide and anionic dye on green adsorbent

• Published in: Journal of molecular structure Vol. 1250; p. 131736
• Main Authors: Al-Wasidi, Asma S., AlZahrani, Ibtisam I.S., Thawibaraka, Hotoun I., Naglah, Ahmed M., El-Desouky, Mohamed G., El-Bindary, Mohamed A.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15-02-2022
• Subjects: AY99; Chemical activation; CO2 adsorption; DSAC; Kinetics; DSAC; Chemical activation; Kinetics; CO2 adsorption; AY99
• ISSN: 0022-2860; 1872-8014
• DOI: 10.1016/j.molstruc.2021.131736

•Synthesis of Date seeds activated carbon (DSAC).•Studies adsorption of CO2 on DSAC.•Studying the mechanism of adsorption and rate controlling steps.•Adsorption data of CO2 showed that adsorption fitted to Langmuir.
As a consequence of the use of obsolete coal and oil and manufacturing techniques, pollution levels are rising, posing a significant threat to the environment and public health. As a result, nearby is a pressing essential to investigate actual CO2 emission and dye removal controls. Though, the achievement of this approach dependent particular on the use of low-cost adsorbent with high CO2 discrimination and high adsorption bulk. In this study, date seed active carbon (DSAC) for capturing CO2 was made using a two-step technique with KOH as the activation and varied carbonization rates. The properties of surface area on carbonization rate were investigated. The DSAC was subjected to BET, XRD, IR, and SEM examination. The researchers discovered that the micro-porous geometry has a significant impact on the adsorption efficiency of DSAC. The greatest CO2 adsorption of 3.7 mmol/g was attained under optimal circumstances of calcination temperature 700 °C, adsorption temperature 0 °C, and pressure 1 bar. Furthermore, activated carbon with a carbonization temperature of 700 °C has a high selectivity for CO2 over N2, indicating that it has a promising future in CO2 capture applications. Langmuir, Henry, Temkin, Toth, Dubbin, Harkin-Jura, Redlich Peterson, Elovich, and Josene models showed the greatest fit for any empirical sorption process that predicted heterogeneous surface characteristics of DSAC. Factors include beginning pH, catalyst loading, contact time, and temperatures have all been explored in order to determine appropriate adsorption parameters of acid yellow 99 (AY99) from aqueous systems. The isotherm of Langmuir was found to be an excellent match for the experimental data. The pseudo-second-order rate expression was utilized to characterize the dye uptake mechanism. Energy of adsorption activation was also determined to be 14 kJ/mol, suggesting chemisorption as the mode of adsorption. At varying temperatures, thermodynamic limitations such as ΔGo, ΔHo, and ΔSo were established. It was endothermic and unexpected, according to the adsorption thermodynamic characteristics. The findings of the research project are presented in form of chemical activation processes for date seeds produced adsorbents for capturing carbon dioxide and AY99 adsorption.
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