Abstract
Magnetite nanoparticles (Fe3O4-NPs)/orange peel (MOP) composite was prepared via one-step in-situ co-precipitation method as magnetic heterogeneous Fenton-like catalyst. The properties of MOP were characterized by scanning electron microscopy, transmission electron microscopes, Brunauer-Emmett-Teller, X-ray diffraction, Fourier-transform infrared, thermogravimetric analysis and X-ray photoelectron spectroscopy technologies. Its Fenton-like catalytic responses towards removal of methyl orange (MO) were investigated, in which the effects of initial dye concentration, pH, temperature and hydrogen peroxide dosage were studied. The MO degradation ratio up to 98.0% was obtained within 20 min in optimized conditions. The catalyst showed excellent catalytic stability exhibiting nearly 90% degradation ratio in the 10th cycle within 20 min, whereas pure Fe3O4-NPs showed only 62.5% in this stage. Due to the stabilization of complexing orange peel hydroxyl to iron oxide in the composite and its magnetic separation property, MOP composite exhibits excellent Fenton-like catalytic performance, which offers great prospects for low-cost and high-efficiency organic dye wastewater treatment.
Highlights
Industrial water pollution is a serious threat to ecological environment and human health at present (Wang & Yang 2016; Naushad et al 2019b; Alqadami et al 2020; Khan et al 2020)
Compared with orange peel (OP), Magnetite nanoparticles (Fe3O4-NPs)/orange peel (MOP) possesses distinct surface morphology with more roughness according to the SEM image illustrated in Figure 1(d), which is attributed to Fe3O4-NPs on its surface
The Barrett–Joyner–Halenda results indicate that both MOP and MP have the characteristics of mesoporous materials with the most probable pore diameter calculated from the desorption branch being 8.44 nm (Figure A.4d) and 3.02 nm (Figure A.4e), respectively
Summary
Industrial water pollution is a serious threat to ecological environment and human health at present (Wang & Yang 2016; Naushad et al 2019b; Alqadami et al 2020; Khan et al 2020). Among them, advanced oxidation processes, including UV–visible photolysis oxidation, catalytic wet air oxidation, ozone oxidation, electrochemical oxidation and Fenton oxidation, are considered to be a promising approach for the removal of refractory and toxic organic dyes (Chan et al 2011; Tijani et al 2014; Deng & Zhao 2015; Cheng et al 2016; Ahsan et al 2021). The classic homogeneous Fenton process has several disadvantages like a narrow pH range and the production of a large amount of iron sludge. To overcome these limitations, both noniron transition metal-based and iron-based catalysts for heterogeneous Fenton-like system have been investigated (Ahsan et al 2020b, 2020c). Iron-based heterogeneous Fenton-like catalyst is abundant in nature and can potentially be used for large-scale industrial dyeing wastewater treatment
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