A comprehensive review on novel zeolite-based adsorbents for environmental pollutant

Zeolite-based materials have demonstrated exceptional potential in the adsorption and removal of various environmental pollutants due to their tunable properties and high efficiency. This review highlights the significant advancements and comparative performance of various zeolite-based composites and their applications in pollution remediation. Zeolite composites such as Fe-Mn oxide/zeolite exhibit a capacity of 53.35 mg/g for Cu(II) adsorption, while Ni/zeolite achieves a capacity of 147.06 mg/g for the same pollutant. For Pb removal, an activated carbon-zeolite composite exhibits an outstanding capacity of 213.3 mg/g, showcasing the effectiveness of hybrid materials. In dye removal, zeolite X incorporated with karaya gum demonstrated an extraordinary capacity of 409 mg/g for Brilliant Green, underscoring its effectiveness in cationic dye sorption. Notably, chitosan/zeolite composites exhibit an adsorption capacity of 221 mg/g for indigo carmine, demonstrating excellent potential for dye removal. In CO 2 capture, 4A zeolite modified with TEPA achieved a record capacity of 9.4 mmol/g at 25 °C and 5 bar, illustrating the effectiveness of amine-functionalized materials in greenhouse gas mitigation. Zeolite-based materials also show promise in hydrogen sulfide removal, with Na/Y zeolite achieving an impressive adsorption capacity of 204 mg H 2 S/g, surpassing industrial molecular sieves. These findings highlight the adaptability of zeolite-based adsorbents in addressing diverse environmental challenges. This review consolidates state-of-the-art advancements by integrating insights into adsorption mechanisms, isotherms, and material modifications. It provides a strategic framework for future research to optimize zeolite-based materials for specific pollutant removal applications.