Catalytic wet air oxidation of phenol over CeO2-TiO2 catalyst in the batch reactor and the packed-bed reactor

Yang, Shaoxia; Zhu, Wanpeng; Wang, Jianbing; Chen, Zhengxiong

doi:10.1016/j.jhazmat.2007.09.084

Cited by 90 publications

(31 citation statements)

References 37 publications

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“…This is due to the decrease of the path length of the photon when entering the reactant solution, with direct consequence on the formation of electron-hole pairs. In other study on the effect of initial reactant concentration [117], the adsorption of phenol intermediates could lead to the irreversible deposition on the surface of Ce-TiO 2 photocatalyst and thus reduce the photodegradation efficiency. Meanwhile, the excessive of reactant concentration could lead to the screening effect that prohibited the penetration of light irradiation [121].…”

Section: Effect Of Initial Reactant Concentrationmentioning

confidence: 99%

An Overview on the Photocatalytic Activity of Nano-Doped-TiO2 in the Degradation of Organic Pollutants

Tan

Wong

Mohamed

2011

ISRN Materials Science

111

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This paper aims to review and summarize the recent works on the photocatalytic degradation of various organic pollutants in the presence of nano-doped-TiO 2 photocatalysts. In this regard, three main aspects are examined: (a) the presence of various dopants (metal dopants, nonmetal dopants, halogen dopants, metalloid dopants, and codopants) in the formation of nano-doped-TiO 2 photocatalysts, (b) the effect of the presence of dopants on the photocatalytic degradation of organic pollutants, and (c) the effects of various operating parameters on the photocatalytic degradation of organic pollutants in the presence of nano-doped-TiO 2 photocatalysts. Reports resulted suggest that the formation of a high percentage of the anatase phase, small crystallite size, and high specific surface area of the nano-doped-TiO 2 photocatalysts depends on the presence of various dopants in the photocatalysts. The majority of the dopants have the potential to improve the photocatalytic efficiency of nano-doped-TiO 2 in the degradation of organic pollutants. The photocatalytic degradation of organic compounds depends on the calcination temperature of the prepared doped TiO 2 , initial reactant concentration, dosage of doped TiO 2 , and dopant doping concentration.

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Section: Effect Of Initial Reactant Concentrationmentioning

confidence: 99%

An Overview on the Photocatalytic Activity of Nano-Doped-TiO2 in the Degradation of Organic Pollutants

Tan

Wong

Mohamed

2011

ISRN Materials Science

111

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“…However, the additional separation step of the homogeneous catalysts has made them less interesting and the development of active heterogeneous catalysts has received more attention in the research area of CWAO. Numerous heterogeneous catalysts such as activated carbon, CeO 2 , TiO 2 , MnO 2 , ZrO 2 and their mixed oxides [12][13][14][15][16][17][18] have been tested in the CWAO of phenol, acetic acid and industrial effluents. Moreover, noble metals (Pt, Ru, Pd) supported on mixed oxides have been found to be the most efficient catalysts in CWAO of different effluents than pure metal oxides [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Cerium Oxide Based Catalysts for Wet Air Oxidation of Bisphenol A

Heponiemi

Azalim

et al. 2015

Top Catal

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Catalytic wet air oxidation of an aqueous solution, bisphenol A (BPA), was carried out at 160°C and at 20 bar of air in a batch reactor. Silver catalysts (2.5 wt%) prepared by wet impregnation and complexation on commercial CeO 2 in addition to Ce 0.85 Zr 0.15 O 2 and Ce 0.2 Zr 0.8 O 2 sol-gel mixed oxides were synthesized and used as catalysts in the reaction. Characterizations of the catalysts were performed by using FESEM, XRD, BET, XPS and ICP-OES techniques. Residual BPA concentration was analyzed by using an UV-Vis technique and organic compound content was measured via the total organic carbon method. Commercial CeO 2 showed a smaller specific surface area and a larger crystallite size than laboratory prepared Ce-Zr mixed oxides. The highest BPA removal (76 %) was achieved after 3 h with CeO 2 , Ce 0.85 Zr 0.15 O 2 and Ag/Ce 0.85 Zr 0.15 O 2 catalysts revealing that the addition of silver had no effect on the catalytic activity of the pure supports. However, the loading of active metal to the supports by complexation decreased the adsorption of the BPA during the heating period and hence the Ag/Ce 0.85 Zr 0.15 O 2 prepared via complexation was the most active catalyst with only 1 % adsorption of BPA. Moreover, the activity of the catalysts was not related to the surface area of the samples. According to the ICP-OES analysis of the terminal water samples, leaching of the silver was occurred during oxidation experiments explaining the behavior of Ag catalysts in the reaction.

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“…Up to know different methods are applied to eliminate phenol combinations from the water environmental like biologic filtration by ultrasound waves, photocatalistic destruction, membranous filtration, enzymatic filtration, and extraction by solvent, chemical oxidation, light oxidation, photochemical destruction and wet oxidation (11)(12)(13)(14)(15)(16)29). Most of these techniques have especial failures like high operative and device costs, needs for additive chemical substrate, high energy consumption, needs to further space and producing mug and toxins (30,31).…”

Section: Introductionmentioning

confidence: 99%

The Evaluation of Removal Efficiency of Phenol from Aqueous Solutions using Moringa Peregrina Tree Shell Ash

Zarei

Bazrafshan²,

Faridi

et al. 2013

Iran J Health Sci

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Background and purpose: Phenol is one of prevalent contaminants found in many industrial wastewaters. The combination with special features, such as high toxicity, carcinogenic properties, vitality gathering ability, low biodegradation potentiality and others, based on the U.S Environmental Protection Agency, classified as a priority pollutant. The purpose of this study was to determine the efficiency of Moringa Peregrina tree shell ash for the removal of phenol from aqueous solutions. Materials and Methods:This study is experimental and pilot scale. To determine the efficiency of Moringa Peregrina tree shell ash for the removal of phenol from aqueous solutions; the examination was carried out in a batch system. To achieve the aim of this study, the effect of each of the parameters affecting the adsorption process, such as initial pH of solution, contact time, adsorbent dose and initial concentration of phenol in solution were studied.Results: The results showed that the highest percentage of phenol removal by the ash occurred at pH 6, initial concentration100 mg.L -1 and adsorbent dose 0.4 g/l in which the 79.96% phenol was removed. For the analysis of the absorption constant, the Freundlich and Langmuir isotherm were used. The results showed that the experimental data fit the Langmuir (R 2 =0.9833) much better than the Freundlich model (R 2 =0.9373). Conclusion:According to the results of this study, it was found that the Moringa Peregrina tree shell ash is not only a low-cost adsorbent but also has a high performance in the removal of phenol from aqueous solutions.

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Catalytic wet air oxidation of phenol over CeO2-TiO2 catalyst in the batch reactor and the packed-bed reactor

Cited by 90 publications

References 37 publications

An Overview on the Photocatalytic Activity of Nano-Doped-TiO2 in the Degradation of Organic Pollutants

An Overview on the Photocatalytic Activity of Nano-Doped-TiO2 in the Degradation of Organic Pollutants

Cerium Oxide Based Catalysts for Wet Air Oxidation of Bisphenol A

The Evaluation of Removal Efficiency of Phenol from Aqueous Solutions using Moringa Peregrina Tree Shell Ash

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