Review of iron-free Fenton-like systems for activating H2O2 in advanced oxidation processes

Catalytic ozonation has recently gained significant attention as an effective process used for the removal of organics from water. Unfortunately, despite increasing research efforts in the field of catalytic ozonation and the introduction of new catalysts, the mechanisms of catalytic processes are still largely unknown. An understanding of the mechanisms of catalytic ozonation is vital in order to introduce this technique in water treatment at an industrial scale. Therefore, the main aim of this paper is to provide a short overview of catalytic processes, their recent advances and to identify major directions taken to understand mechanisms governing catalytic processes utilised in water and wastewater treatment. Catalytic ozonation is considered to belong to Advanced Oxidation Processes. However, the results published by several research groups indicate that not all catalytic processes utilise the power of hydroxyl radicals.

The efficiency and mechanisms of catalytic ozonation

The mechanism of degradation of bisphenol A using the magnetically separable CuFe2O4/peroxymonosulfate heterogeneous oxidation process.

Catalytic ozonation for water and wastewater treatment: Recent advances and perspective.

Fe-based catalysts for heterogeneous catalytic ozonation of emerging contaminants in water and wastewater

The catalytic activity of FeOOH on ozonation of oxalic acid at pH 4.0 and 7.0 conditions was investigated in a semi-continuous experimental mode. The results indicate that FeOOH can effectively promote the generation of hydroxyl radicals ( OH) under acidic and neutral pH conditions, resulting in the enhancement of the degradation efficiency of oxalic acid by ozone. It is deduced that the hydroxyl groups both of in neutral state (Me-OH) and positive charge state (Me-OH2+) can perform as the active sites for ozone decomposition into hydroxyl radicals generation. The ligand exchange of hydroxyl groups by phosphate adsorption deteriorates the catalytic activity of FeOOH on ozonation, but the phosphate is found to desorb from FeOOH during the catalytic ozonation process, resulting in the reactivation of the catalytic activity of FeOOH.

FeOOH catalytic ozonation of oxalic acid and the effect of phosphate binding on its catalytic activity

Heterogeneous catalytic ozonation of ciprofloxacin in water with carbon nanotube supported manganese oxides as catalyst

Mesoporous material (MCM-41) supported manganese oxides (MnOx) as catalyst was introduced into ozonation process. The catalytic activity of MnOx/MCM-41 on ozonation of nitrobenzene (NB) was evaluated. Both of the indirect method, using tert-butanol (TBA) as a scavenger, and the direct electron spin resonance (ESR) determination technology were employed to investigate whether the high reactivity of MnOx/MCM-41 on ozonation is ascribed to the promotion of the generation of hydroxyl radicals. Though the presence of TBA has insignificant effect on MnOx/MCM-41 catalytic ozonation of NB, stronger signal intensity of DMPO-OH adduct was observed in MnOx/MCM-41 catalytic ozonation than that of in ozonation alone system. Furthermore, the catalytic performance of MnOx/MCM-41 on ozone in different water background (tap water, prepared inorganic and organic water) was investigated.

Mesoporous material supported manganese oxides (MnOx/MCM-41) catalytic ozonation of nitrobenzene in water

Synthesis of ZnO coated multi-walled carbon nanotubes and their antibacterial activities

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Li Sheng

Papers

FeOOH catalytic ozonation of oxalic acid and the effect of phosphate binding on its catalytic activity

Heterogeneous catalytic ozonation of ciprofloxacin in water with carbon nanotube supported manganese oxides as catalyst

Mesoporous material supported manganese oxides (MnOx/MCM-41) catalytic ozonation of nitrobenzene in water

Synthesis of ZnO coated multi-walled carbon nanotubes and their antibacterial activities

Adsorption of norfloxacin in aqueous solution by Mg-Al layered double hydroxides with variable metal composition and interlayer anions