Adsorption and heterogeneous Fenton catalytic performance for magnetic Fe 3 O 4 /reduced graphene oxide aerogel
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Adsorption and heterogeneous Fenton catalytic performance for magnetic Fe3O4/reduced graphene oxide aerogel Fengling Zhang1 1 2
, Xiangxin Xue1,*, Xiaowei Huang2, and He Yang1
School of Metallurgy, Northeastern University, Shenyang 110819, China National Engineering Research Center for Rare Earth Materials, General Research Institute for Nonferrous Metals and Grirem Advanced Materials Co., Ltd., Beijing 100088, China
Received: 5 June 2020
ABSTRACT
Accepted: 23 August 2020
Heterogeneous Fenton system has been widely used in water treatment because of its effective degradability in a wide range of pH. A two-step hydrothermal method for the synthesis of Fe3O4/reduced graphene oxide (RGO) aerogel was designed as an efficient and recyclable heterogeneous Fenton catalyst for degradation of methylene blue (MB). Firstly, the Fe3O4 colloidal solution was synthesized by hydrothermal progress. Secondly, graphene oxide hydrogels were formed by the self-assembling and reduced to graphene during the hydrothermal reaction. Meanwhile, zero-dimensional Fe3O4 nanoparticles were anchored onto the graphene oxide through the colloidal coagulation effect. The obtained samples were characterized by XRD, SEM, TEM, BET, Zeta, XPS, Raman, TG, and VSM. Adsorption isotherm and kinetics of MB onto Fe3O4/ RGO composites revealed that the maximum adsorption capacity was 163.83 mg/g, and the adsorption process confirmed to the pseudo-second-order model. The determinants of heterogeneous Fenton system including oxidant concentration, initial pH, and reaction mechanism were investigated. The studies indicated that MB degradation efficiencies increased with the initial pH increasing (pH 3–10), showing a complete degradation in alkaline condition within 60 min. It is due to that catalytic reaction mainly occurs on the solid– liquid interface, as pH values increase, the electrostatic attraction between the cationic MB molecules and the surface of Fe3O4/RGO increases, the enhancement of adsorptivity is helpful to improve catalytic activity. The catalyst can be easily recovered by an applied magnetic field and exhibited excellent stability after five degradation cycles.
Published online: 31 August 2020
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
Handling Editor: Dale Huber.
Address correspondence to E-mail: [email protected]
https://doi.org/10.1007/s10853-020-05159-4
15696 Introduction The harmful effect of various organic pollutants in water on people’s life is a pressing matter of great concern and hot topic in modern scientific researches. Advanced oxidation process (AOPs) is a promising alternative strategy for wastewater treatment, especially for persistent and refractory organic pollutants. AOPs can generate strong oxidative hydroxyl radicals in the reaction process, which can non-selective attack all types of organic compounds to mineralize, leading to completely decompose contaminants into non-toxic products [1–3]. One of the most in-depth studied AOPs is Fenton system, which has unique advantages includ
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