Facile preparation of reduced graphene oxide for removing tetracycline from water: Kinetics and thermodynamics studies

• Published in: Separation science and technology Vol. 57; no. 12; pp. 1872 - 1883
• Main Authors: Tran, Dinh-Trinh, Ha, Thi-My-Trinh, Nguyen, Thi-An-Hang, Dang, Viet-Cuong, Dao, Van-Duong
• Format: Journal Article
• Language: English
• Published: Abingdon Taylor & Francis 13.08.2022; Taylor & Francis Ltd
• Subjects: Adsorption; Chemisorption; Graphene; influencing parameters; Isotherms; Kinetics; Oxidation; regeneration; Sodium hydroxide; Tetracycline; Thermodynamics; Uptake
• ISSN: 0149-6395; 1520-5754
• DOI: 10.1080/01496395.2021.2013891

In this study, reduced graphene oxide (rGO) was successfully produced from graphite precursor by chemical oxidation and exfoliation processes that were followed by a reduction process under mild conditions. SEM/EDX, XRD, FT-IR, BET, pH pzc were conducted to characterize the as-synthesized materials. Impacts of different factors such as contact time, temperature, pH of the solution, adsorbent load, and tetracycline (TC) concentration on TC removal efficiency were examined. Furthermore, the adsorption kinetics, thermodynamics, and isotherms were also investigated. As the result, the adsorption process of TC onto rGO was spontaneous, endothermic, and governed by both physisorption and chemisorption. The maximum uptake calculated from the Langmuir isotherm model was 58.03 mg/g. rGO material could be regenerated by using methanol and diluted NaOH solutions. The findings in this work provided complete data on the TC adsorption process onto rGO and the process of the recovery and reuse of rGO.