Effective mitigation of single-component and mixed textile dyes from aqueous media using recyclable graphene-based nanocomposite

Tran, Thuan Van and Vo, Dai-Viet N. and Nguyen, Duyen Thi Cam and Ching, Yern Chee and Nguyen, Ngoc Tung and Nguyen, Quang Trung (2022) Effective mitigation of single-component and mixed textile dyes from aqueous media using recyclable graphene-based nanocomposite. Environmental Science and Pollution Research, 29 (21). pp. 32120-32141. ISSN 0944-1344, DOI https://doi.org/10.1007/s11356-022-18570-y.

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The present study reported the synthesis and utilization of a graphene-based hybrid nanocomposite (MnFe2O4/G) to mitigate several synthetic dyes, including methylene blue, malachite green, crystal violet, and Rhodamine B. This adsorbent was structurally analyzed by several physicochemical techniques such as X-ray diffraction, Fourier-transform infrared spectroscopy, scanning electron microscopy, Raman spectroscopy, N-2 adsorption-desorption isotherm measurement, point of zero charge, and Boehm titrations. BET surface area of MnFe2O4/G was measured at 382.98 m(2)/g, which was substantially higher than that of MnFe2O4. MnFe2O4/G possessed diverse surface chemistry properties with the presence of many functional groups such as carboxylic acid, phenolic, lactone, and basic groups. MnFe2O4/G was used to remove synthetic dyes in the aqueous media. The effect of many factors, e.g., concentration (5-50 mg/L), pH (4-10), dose (5-20 mg), and temperature (25-45 degrees C) on adsorption performance of MnFe2O4/G was conducted. Kinetic, isotherm, intraparticle, and thermodynamic models were adopted for investigating adsorption phenomenon of dyes on MnFe2O4/G. The maximum adsorption capacity of dyes over MnFe2O4/G was found as Rhodamine B (67.8 mg/g) < crystal violet (81.3 mg/g) < methylene blue (137.7 mg/g) < malachite green (394.5 mg/g). Some tests were performed to remove mixed dyes, and mixed dyes in the presence of antibiotics with total efficiencies of 65.8-87.9% after 120 min. Moreover, the major role of pi-pi stacking interaction was clarified to gain insight into the adsorption mechanism. MnFe2O4/G could recycle up to 4 cycles, which may be beneficial for further practical water treatment.

Item Type: Article
Funders: National Foundation for Science & Technology Development (NAFOSTED) (Grant No: 104.06-2017.45)
Uncontrolled Keywords: Graphene; Magnetic nanocomposites; Textile dye; Water treatment; Adsorption
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
T Technology > TP Chemical technology
Divisions: Faculty of Engineering > Department of Chemical Engineering
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 25 Oct 2023 02:20
Last Modified: 25 Oct 2023 02:20
URI: http://eprints.um.edu.my/id/eprint/41768

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