Author(s): NEVES, T. R.; SCHILDT, L. F. L.; SILVA, M. L. L. S. e; VASCONCELOS, V. V. V.; DI CONZO C.; MURA, F.; ROSSI. M.; VARVARO, G.; ABDOLRAHIMI, M.; QUARANTA, S.; FERREIRA, S. A. D.; PARIS, E. C.

Summary: Adsorption has emerged as a promising method for removing polyphenols in water remediation. This work explores chlorogenic acid (CGA) adsorption on zeolite-based magnetic nanocomposites synthesized from rice husk waste. In particular, enhanced adsorbing materials were attained using a hydrothermal zeolite precursor (Z18) synthesized from rice husk and possessing a remarkable specific surface area (217.69 m2 g ?1 ). A composite material was prepared by immobilizing magnetic copper ferrite on Z18 (Z18:CuFe2O4 ) to recover the zeolite adsorbent. In addition, Z18 was modified (Z18 M) with a mixture of 3-minopropyltriethoxysilane (APTES) and trimethylchlorosilane (TMCS) to improve the affinity towards organic compounds in the final nanocomposite system (Z18 M:CuFe2O4 ). While the unmodified composite demonstrated inconsequential CGA removal rates, Z18 M:CuFe2O4 could adsorb 89.35% of CGA within the first hour of operation. Z18 M:CuFe2O4 showed no toxicity for seed germination and achieved a mass recovery of 85% (due to a saturation magnetization of 4.1 emu g?1 ) when an external magnetic field was applied. These results suggest that adsorbing magnetic nanocomposites are amenable to CGA polyphenol removal from wastewater. Furthermore, the reuse, revalorization, and conversion into value-added materials of agro-industrial waste may allow the opportunity to implement sustainability and work towards a circular economy.

Publication year: 2024

Types of publication: Journal article

Unit: Embrapa Instrumentation

Keywords: Magnetic nanocomposite, Rice husk, Zeolite