1 Introduction</h5> Nowadays, increasing global attention of water pollution has become a serious issue facing humanity in the current situation, which promoting increasing demand for clean water environment. Heterogeneous Fenton and related reactions encompass the reactions of hydrogen peroxide with solid iron-based catalysts to form powerful hydroxyl radicals ( OH) to remove organic pollutants. Importantly, the heterogeneous Fenton catalysts have already overcome the critical drawbacks of homogeneous Fenton reaction, i.e., rigorous operating pH range and the formation of iron sludge in the coagulation step, and been widely explored in wastewater treatment [1–3] . Additionally, in order to improve the activity of traditional Fenton catalysts [4,5] , such as α-FeOOH, Fe 2 O 3 , Fe 3 O 4 , transitional metal substitutions (Fe, Cr, Mn, Co, Nb and Ni) can be added as secondary active sites for both improving activation H 2 O 2 and enhancing stability [2,6] . Meanwhile, the structure and the morphology of catalysts can be also modified for enhancing catalytic activity  . Another way is iron immobilization, which immobilized the active components iron-containing substances on carriers [8,9] like activated carbon (AC), mesoporous silica (SBA-15), mesoporous molecular sieves, and so on. Although lot of
Journal of Molecular Catalysis A: Chemical – Elsevier
Published: May 1, 2015
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