Photo-electrochemical degradation of some chlorinated organic compounds on n-TiO2 electrode

Ohsaka, Takashi; Shinozaki, Kazuyuki; Tsuruta, Kazuhisa; Hirano, Katsuhiko

doi:10.1016/j.chemosphere.2008.07.016

Cited by 26 publications

(9 citation statements)

References 7 publications

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“…As shown in Figure 2, upon UV irradiation, TiO 2 will generate reactive oxygen species (ROS) which can completely degrade contaminants in very short reaction time. Besides, TiO 2 NPs show little selectivity and thus are suitable for the degradation of all kinds of contaminants, such as chlorinated organic compounds [54], polycyclic aromatic hydrocarbons [55], dyes [56], phenols [57], pesticides [58], arsenic [59], cyanide [60], Figure 2: Schematic presentation of the mechanism of TiO 2 photocatalytic process. Reprinted from [59] with permission.…”

Section: Metal Oxides Nanoparticlesmentioning

confidence: 99%

An Overview of Nanomaterials for Water and Wastewater Treatment

Lu¹,

Wang²,

Stoller³

et al. 2016

Advances in Materials Science and Engineering

251

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Due to the exceptional characteristics which resulted from nanoscale size, such as improved catalysis and adsorption properties as well as high reactivity, nanomaterials have been the subject of active research and development worldwide in recent years. Numerous studies have shown that nanomaterials can effectively remove various pollutants in water and thus have been successfully applied in water and wastewater treatment. In this paper, the most extensively studied nanomaterials, zero-valent metal nanoparticles (Ag, Fe, and Zn), metal oxide nanoparticles (TiO2, ZnO, and iron oxides), carbon nanotubes (CNTs), and nanocomposites are discussed and highlighted in detail. Besides, future aspects of nanomaterials in water and wastewater treatment are discussed.

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Section: Metal Oxides Nanoparticlesmentioning

confidence: 99%

An Overview of Nanomaterials for Water and Wastewater Treatment

Lu¹,

Wang²,

Stoller³

et al. 2016

Advances in Materials Science and Engineering

251

View full text Add to dashboard Cite

show abstract

“…Nondestructive methods such as adsorption and extraction (Corsi and Card 1991) are less effective because the methods transfer pollutants from one phase to another. Therefore, destructive methods, such as aerobic/anaerobic degradation (Stucki et al 1992;Perez-de-Mora et al 2014), chemical oxidation (Reddy et al 2007), photochemical oxidation (Mohseni 2005;Ohsaka et al 2008), and chemical reduction (Harendra and Vipulanandan 2011), are more desirable. Although chemical methods are effective in degrading COC, expertise intensive chemicals such as H 2 O 2 (Curtler et al 1994), O 3 (Torun et al 2011), and zero-valent iron (Janda et al 2004;Fu et al 2014) are often consumed.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Degradation of Chloroform Using Ti/IrO2 Anode and Cu/Zn Cathode

et al. 2016

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Electrochemical method is a promising technology for biorefractory organic wastewater treatment. In this study, commercial available electrode materials, Ti=IrO 2 and Cu/Zn, were used as anode and cathode, respectively, to treat CHCl 3-contaminated water. The performance was investigated through cyclic voltammetry and paired electrolysis in an undivided cell. The voltammetric data revealed that the Cu/Zn cathode exhibited good electrocatalytic activity toward CHCl 3 reduction. By contrast, no direct oxidation of CHCl 3 was observed at the Ti=IrO 2 anode. The reduction of CHCl 3 at the Cu/Zn cathode took place through a three-step consecutive hydrodechlorination mechanism. During the paired electrolysis with current density of 15 mA=cm 2 , the chemical oxygen demand (COD) of CHCl 3 solution was decreased from 194 to 74 mg=L within 300 min with an energy consumption of 28.6 kWh • L −1. A mild acidic environment (pH 4.6) was shown to be more favorable to CHCl 3 abatement. Decreasing the anode/cathode surface area ratio also had significant impact on CHCl 3 reduction, and the optimal ratio was 2.0. The results demonstrated that Cu/Zn cathode is a potential candidate for chlorinated organic compound removal.

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“…The maximum concentration level of CT is set at 5 and 2 µg/L in safe drinking water act [1] and standards for drinking water quality (GB 5749-2006), respectively. Many kinds of methods were applied to removing CT from water or wastewater, such as reductive dechlorination [2], biodegradation [3], oxidation [4], ultrasonic destruction [5], photoelectrochemical degradation [6], and adsorption [7]. Adsorption is one of the most effective and widely used techniques because of its relatively simple design, easy operation and simple regeneration.…”

Section: Introductionmentioning

confidence: 99%

Adsorption characteristics of carbon tetrachloride from aqueous solution onto polyacrylonitrile-based activated carbon fiber

Liu

Guan

2010

J. Cent. South Univ. Technol.

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The isotherm, mechanism and kinetics of carbon tetrachloride (CT) adsorption by polyacrylonitrile-based activated carbon fiber (PAN-ACF) were investigated in batch reactors and a continuous flow reactor, and the regeneration of PAN-ACF was also studied. Freundlich and Dubinin-Radushkevich (D-R) adsorption equations can well describe the adsorption isotherm. CT is mainly adsorbed on the exterior surface of PAN-ACF with low boundary layer effect and rate-controlling step of intra-particle diffusion. The adsorption dynamics in the batch reactor well fits with the pseudo-first-order model, and the breakthrough curves in the continuous flow reactor can be well described by the Yoon-Nelson model. The ACF can be recycled through thermal regeneration, whereas the adsorption capacity decreases from 7.87 to 4.98 mg/g after the fourth regeneration. 78%−94% of CT can be removed from the wastewater of a fluorine chemical plant on a pilot scale, which confirms the efficacy of ACF under industrial conditions. The results indicate that PAN-ACF is applicable to CT removal from wastewater.

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Photo-electrochemical degradation of some chlorinated organic compounds on n-TiO2 electrode

Cited by 26 publications

References 7 publications

An Overview of Nanomaterials for Water and Wastewater Treatment

An Overview of Nanomaterials for Water and Wastewater Treatment

Electrochemical Degradation of Chloroform Using Ti/IrO2 Anode and Cu/Zn Cathode

Adsorption characteristics of carbon tetrachloride from aqueous solution onto polyacrylonitrile-based activated carbon fiber

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