Enhanced ozonation of dichloroacetic acid in aqueous solution using nanometer ZnO powders

Xu, Zuhua; Chen, Zhonglin; Zhao, Shuqing; Wang, He; Yang, Lei

doi:10.1016/s1001-0742(09)60284-9

Cited by 57 publications

(22 citation statements)

References 32 publications

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“…Solution pH has been found another crucial operation parameter strongly affecting ozone stability, catalyst surface property and ozone decomposition mechanism. (Lage, 2010;Xing et al, 2014;Zhai et al, 2010) It was also a variable during the catalytic ozonation process. Fig.…”

Section: Catalytic Ozonation Performancementioning

confidence: 99%

Promoting catalytic ozonation of phenol over graphene through nitrogenation and Co 3 O 4 compositing

Bao

Hui

Duh

2016

Journal of Environmental Sciences

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Catalytic ozonation is progressively becoming an attractive technique for quick water purification but efficient and stable catalysts remains still elusive. Here we solvothermally synthesized highly-dispersed Co3O4 nanocrystals over microscale nitrogen-doping graphene (NG) nanosheets and tested it as a synthetic catalyst in the ozonation of phenol in acid aqueous solutions. Transmission electron microscopy, Powder X-ray diffraction, Fourier transform infrared spectra and X-ray photoelectron spectroscopy were used to determine its morphology, crystallinity, elemental

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Section: Catalytic Ozonation Performancementioning

confidence: 99%

Promoting catalytic ozonation of phenol over graphene through nitrogenation and Co 3 O 4 compositing

Bao

Hui

Duh

2016

Journal of Environmental Sciences

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“…Quantum-chemical calculation is also used to explain the decomposition of ozone molecule and radical generation on the surfaces in the literature. Zhai et al (2010) used ZnO as a catalyst in the ozonation process to investigate dichloroacetic acid degradation. They showed that there is a significant increase in the organics removal level during the catalytic ozonation and verified the results using DFT.…”

Section: Resultsmentioning

confidence: 99%

Experimental study of humic acid degradation and theoretical modelling of catalytic ozonation

Türkay

İnan

Димогло

2014

Environ Sci Pollut Res

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The efficiency of TiO2 as a catalyst in the ozonation of humic acid (HA) was evaluated in a comprehensive manner. Ozonation, catalytic ozonation and adsorption experiments were conducted using both synthetic HA solution and natural water. HA degradation was evaluated in terms of DOC, VIS400 and UV254. It was shown that the addition of catalyst positively affects the mechanism of ozonation. An increase in HA degradation was observed for all these parameters. The impact of catalyst dose and initial pH value of HA on the efficacy of catalytic ozonation was investigated. The highest removal efficiencies were achieved with the dose of 1 g l(-1) of TiO2 (Degussa P-25) and in the acidic pH region. The catalytic ozonation process was efficient also on natural water component although not at the same level as it was on synthetic water. The adsorptive feature of P-25 was considered to have a clear evidence of the catalytic ozonation mechanism. The mechanism of catalysis on the surface of metal oxides was elucidated with the help of quantum-chemical calculations. In the framework of Density Function Theory (DFT), the O3 decomposition was calculated in the catalytic and non-catalytic processes. Donor-acceptor properties of the frontier (highest occupied and lowest unoccupied molecular orbitals, HOMO/LUMO) orbitals are discussed. Electron density distribution and reaction mechanism of superoxide particles formation, which participate in the process of HA ozonation are analyzed.

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“…Figure 3 shows that pH decreases slightly within the first 20 min, and then increases later on. Generated acids led to a decrease in pH during the first 20 min; however, the increase in pH after 20 min was attributed to the fact that acids further decomposed into H 2 O and CO 2 (Zhai et al 2010). Figure 4 (a) shows that at the dosage of below 3 g L −1 , the removal efficiency of COD could be obviously improved by the catalysts.…”

Section: Influence Of Initial Ph On Degradation Of Refinery Wastewatementioning

confidence: 99%

Heterogeneous Catalytic Ozonation of Refinery Wastewater over Alumina-Supported Mn and Cu Oxides Catalyst

Deng

Qiu

Chen

et al. 2015

Ozone: Science & Engineering

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An economical method was proposed to develop an efficient alumina-supported manganese (Mn) and copper (Cu) oxides (Mn-Cu-O/Al 2 O 3 ) catalyst with a high surface area, 184.06 cm 2 g −1 . The catalyst was utilized for degradation refinery wastewater by heterogeneous catalytic ozonation. The effects of various operating variables including pH, ozone and catalyst dosages, and temperature were systematically investigated in detail to obtain the optimized conditions for accelerated degradation of refinery wastewater. The optimum values were as follows: ozone dose 50.0 mg L −1 , catalyst dose 3.0 g L −1 , initial pH = 6.8, T = 17 • C. Refinery wastewater samples were analyzed by chemical oxygen demand (COD) and the results indicated that kinetics of COD followed a pseudo-first-order degradation. Moreover, hydroxyl radical mechanism rather than absorption was proposed, indicating that the surface hydroxyl groups were the active sites that played a significant role in catalytic ozonation.

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Enhanced ozonation of dichloroacetic acid in aqueous solution using nanometer ZnO powders

Cited by 57 publications

References 32 publications

Promoting catalytic ozonation of phenol over graphene through nitrogenation and Co 3 O 4 compositing

Promoting catalytic ozonation of phenol over graphene through nitrogenation and Co 3 O 4 compositing

Experimental study of humic acid degradation and theoretical modelling of catalytic ozonation

Heterogeneous Catalytic Ozonation of Refinery Wastewater over Alumina-Supported Mn and Cu Oxides Catalyst

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