Título:	Hybrid magnetic CoFe2O4@γ-Fe2O3@CTAB nanocomposites as efficient and reusable adsorbents for Remazol Brilliant Blue R dye
Autor(es):	Oliveira, Helena Augusta Lisboa de Gomide, Guilherme Vieira, Clauber Alex de Melo Guerra, Ana Alice Andrade Meireles Depeyrot, Jerome Campos, Alex Fabiano Cortez
E-mail do autor:	mailto:relex@unb.br
ORCID:	https://orcid.org/0000-0002-3021-921X https://orcid.org/0000-0002-3564-9008 https://orcid.org/0000-0002-1689-573X https://orcid.org/0000-0002-7918-8522
Assunto:	Nanoadsorventes magnéticos Remoção de corantes Remediação de águas
Data de publicação:	1-Set-2022
Editora:	Taylor & Francis
Referência:	OLIVEIRA, Helena Augusta Lisboa de et. al. Hybrid magnetic CoFe2O4@γ-Fe2O3@CTAB nanocomposites as efficient and reusable adsorbents for Remazol Brilliant Blue R dye. Environmental Technology, 2022. DOI 10.1080/09593330.2022.2115946. Disponível em: https://www.tandfonline.com/doi/full/10.1080/09593330.2022.2115946. Acesso em: 08 nov. 2022.
Abstract:	The main goal of the present survey was to elaborate, characterize and evaluate the efficiency of ferrite-based nanoparticles modified with cetyltrimethylammonium bromide (CTAB) as potential magnetic nanoadsorbents to remove Remazol Brilliant Blue R (RBBR) from water. It is proposed an innovative nanomaterial architecture based on highly magnetic and chemically stable core@shell nanoparticles covered by an adsorptive surface layer of CTAB (CoFe2O4@γFe2O3@CTAB). Samples of two different mean sizes (7.5 and 14.6 nm) were synthesized using a hydrothermal coprecipitation followed by surface treatment and functionalization. Batch tests were performed to evaluate the influence of contact time, temperature, pH, shaking rate, presence of interferents and mean size on the performance of the proposed nanomaterials. The kinetics of the adsorption process followed the pseudo-second-order model with an equilibrium time of 20 min. The adsorption capacity was estimated by the Langmuir isotherm model and was found to be 56.3 mg/g (smaller size) and 45.6 mg/g (larger size) at pH = 3 and a shaking rate of 400 rpm. The process was spontaneous, exothermic, and showed increased randomness. Sulphate ions negatively impacted the removal of RBBR. The best performance of the nanoadsorbent based on smaller mean sizes can be correlated to its larger surface area. Regeneration and readsorption tests showed that the nanoadsorbents retain more than 80% of their original removal capacity, therefore they can be effectively recycled and reused.
DOI:	https://doi.org/10.1080/09593330.2022.2115946
Versão da editora:	https://www.tandfonline.com/doi/full/10.1080/09593330.2022.2115946
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