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Removal of Orange II using an adsorbent-supported zero-valent iron as a heterogeneous Fenton-like catalyst

Orange II was difficult to degrade and it was selected as a target pollutant in the present study. In this paper, a granular porous adsorbent (GPA) containing zero-valent iron (ZVI) (GPA-ZVI) was produced and applied as a Fenton-like oxidation catalyst to degrade Orange II. Firstly, GPA-ZVI was prepared with coke as the reducing agent, Enteromorpha prolifera as the pore-forming agent, iron ore tailings as a source of ZVI, fly ash as the skeletal material and bentonite as the binder. ZVI was produced through the reduction of iron ore tailings powder by coke at a high temperature under a reducing atmosphere and embedded in the granular porous-based adsorbent. Secondly, the structure and composition of the GPA-ZVI were analyzed by Brunauer–Emmett–Teller method, X-ray diffraction, energy dispersive spectroscopy, Fourier transform infrared spectrometry and scanning electron microscopy. Thirdly, batch experiments were performed to study the influence of some parameters such as GPA-ZVI dosage, H2O2 concentration, pH, and temperature on Orange II removal. The removal efficiency of Orange II using a combined GPA-ZVI and Fenton oxidation process (GPA-ZVI/H2O2) was 91.24% while the removal efficiency of Orange II by H2O2, GPA-ZVI and Fe/H2O2 was only 1.48%, 18.94%, and 58.43%, respectively. The degradation kinetics fitted to the pseudo-first-order kinetic model. Removal mechanisms of Orange II using GPA-ZVI/H2O2 including the adsorption and oxidation were proposed. In a word, GPA-ZVI/H2O2 was highly effective in degrading Orange II.