Evaluation of Fe 3 O 4 -MnO 2 @RGO magnetic nanocomposite as an effective persulfate activator and metal adsorbent in aqueous solution

A reduced graphene oxide (RGO) supported Fe O -MnO nanocomposite (Fe O -MnO @RGO) was successfully prepared for catalytic degradation of oxytetracycline (20 mg/L) by potassium persulfate (PS) and adsorption removal of mixture of Pb , Cu , and Cd ions (each 0.2 mM) in the synchronous scenario. The re...

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Published inEnvironmental science and pollution research international Vol. 30; no. 17; p. 51125
Main Authors Lu, Mang, Wu, Xue-Jiao, Wan, Chu-Xing, Gong, Qiu-Ping, Li, Jia-Xin, Liao, Shuang-Shuang, Wang, Yu-An, Yuan, Shu-Hao
Format Journal Article
LanguageEnglish
Published Germany 01.04.2023
Subjects
Cadmium
Lead
Magnetic Phenomena
Manganese Compounds
Nanocomposites
Oxides
Oxytetracycline
Water
Oxytetracycline
Reusability
Adsorption
Mineralization
Persulfate
Reduced graphene oxide (RGO)
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Summary:A reduced graphene oxide (RGO) supported Fe O -MnO nanocomposite (Fe O -MnO @RGO) was successfully prepared for catalytic degradation of oxytetracycline (20 mg/L) by potassium persulfate (PS) and adsorption removal of mixture of Pb , Cu , and Cd ions (each 0.2 mM) in the synchronous scenario. The removal efficiencies of oxytetracycline, Pb , Cu , and Cd ions were observed as high as 100%, 99.9%, 99.8%, and 99.8%, respectively, under the conditions of [PS]  = 4 mM, pH  = 7.0, Fe O -MnO @RGO dosage = 0.8 g/L, reaction time = 90 min. The ternary composite exhibited higher oxytetracycline degradation/mineralization efficiency, greater metal adsorption capacity (Cd 104.1 mg/g, Pb 206.8 mg/g, Cu 70.2 mg/g), and better PS utilization (62.6%) than its unary and binary counterparts including RGO, Fe O , Fe O @RGO, and Fe O -MnO . More importantly, the ternary composite had good magnetic recoverability and excellent reusability. Notably, Fe, Mn, and RGO could play a synergistic role in the improvement of pollutant removal. Quenching results indicate that surface bounded SO was the major contributor to oxytetracycline decomposition, and the -OH groups on the composite surface shouldered a significant role in PS activation. The results indicate that the magnetic Fe O -MnO @RGO nanocomposite has a good potential for removing organic-metal co-contaminants in waterbody.
ISSN:1614-7499