Magnetic nanomodified activated carbon: characterization and use for organic acids sorption in aqueous medium

Author(s)

Barbosa, Julia Adorno ^[1] ; Labuto, Georgia ^{[2, 3]} ; Vasconcelos Martins Carrilho, Elma Neide ^{[1, 4]}

Affiliation

^[1] Univ Fed Sao Carlos, Lab Mat Polimer & Biossorventes, Araras - Brazil

^[2] Univ Fed Sao Paulo, Dept Quim, Diadema - Brazil

^[3] Univ Fed Sao Paulo, Lab Integrated Sci, Diadema - Brazil

^[4] Univ Fed Sao Carlos, Dept Ciencias Nat Matemat & Educ, Araras - Brazil

• Document type: Journal article
• Source: Chemical Engineering Communications; v. 208, n. 10, p. 1450-1463, AUG 10 2021.
• Web of Science Citations: 1

Abstract

A new approach on the sorption of aconitic and citric acids by activated carbon (AC) after nanomodification with Fe3O4(AC-MNP) is proposed in batch procedures and as SPE (Solid Phase Extraction) cartridges for the treatment of complex samples prior to HPLC analysis. AC and AC-MNP were characterized by XRD, SEM, EDS, and FTIR. The mean crystallite size of AC-MNP and MNP were 19.16 and 10.70 nm, respectively, and FTIR bands characteristics of C = C, C-O, OH, and Fe-O were identified. Amaranth red dye sorption by AC and AC-MNP was evaluated and indicated that the surface charge of AC and AC-MNP is predominantly cationic. Experimental AC-MNP sorption capacity (SCexp) for aconitic and citric acids were 52.44 mg/g and 36.88 mg/g, respectively, and these analytes were determined by high performance liquid chromatography (HPLC). Nanomodified activated carbon (AC-MNP) cartridges were prepared to be used as SPE and compared with commercially available C18. The retention capacity of AC-MNP was 75% higher than that of C18, resulting, respectively, in 29.31 mg/g and 30.06 mg/g AC-MNP for aconitic, and 7.81 mg/g and 8.44 mg/g C18 for citric acids. Among the isotherms models used, Freundlich and Langmuir were better adjusted to aconitic and citric acid, respectively. The AC-MNP sorbent seems to be an efficient low-cost alternative to the commercially C18 cartridges most commonly used for sample pretreatment prior to organic acid determination in complex samples analysis by HPLC. (AU)

• FAPESP's process: 16/06271-4 - Development of adsorbents from yeast biomass residue from industrial fermentation processes to remove emerging contaminants from water and effluents
• Grantee: Geórgia Christina Labuto Araújo
• Support Opportunities: Regular Research Grants