Understanding the characteristics of SO2 capture: Effect of solar-assisted adsorbent, isotherms, kinetics, thermodynamics, and mechanism
The study contributed to developing sustainable clean energy technologies by providing a novel approach for SO2 capture, which is essential for reducing emissions and mitigating climate change. Due to its high stability and corrosion resistance, reduced graphene oxide (RGO) is preferred for SO2 capt...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-08-01
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| Series: | Alexandria Engineering Journal |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1110016825006519 |
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| Summary: | The study contributed to developing sustainable clean energy technologies by providing a novel approach for SO2 capture, which is essential for reducing emissions and mitigating climate change. Due to its high stability and corrosion resistance, reduced graphene oxide (RGO) is preferred for SO2 capture. In this study, GO was reduced sustainably using sunlight (SARGO) and was employed for SO2 adsorption. By using various characterization techniques, it was confirmed that the synthesized SARGO adsorbent has a mesoporous structure with potential functional groups, great thermal stability, high surface area (713.4 m2/g), pore size (4.89 nm), and pore volume (0.79 cm3/g). The maximum adsorption capacity and efficiency were 23.72 mg/g and 93.8 %. Sips isotherm and Pseudo-second order kinetic models are more appropriate for relating the SO2 adsorption to the SARGO adsorbent. Along with thermodynamic studies, the adsorption mechanism and photoreduction mechanism were detailed. The SO2 adsorption process belongs to exothermic, spontaneous, and physical adsorption. Further, the obtained wide functional groups of O–H, –COOH, and –O– are favorable for SO2 adsorption onto the adsorbent via hydrogen bonding, acid-base interactions, dipole-dipole interactions, and covalent bonds. SARGO has excellent reusability and stability for industrial applications. The approximate cost was roughly calculated to be $1.25/mg of SO2 adsorbed onto SARGO adsorbent. The study findings successfully demonstrated the potential for environmental engineering, particularly in air pollution control, sustainable energy, and clean technologies, emphasizing the potential of solar-assisted adsorbents for reducing emissions and optimizing industrial processes. The study provided a thorough understanding of the adsorbent characteristics, including isotherms, kinetics, thermodynamics, and mechanisms, offering valuable insights for industrial applications. |
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| ISSN: | 1110-0168 |