Heterogeneous photocatalysis: Degradation of dilute solutions of dichloromethane (CH2Cl2), chloroform (CHCl3), and carbon tetrachloride (CCl4) with illuminated TiO2 photocatalyst

Hsiao, Chen-Yung; Lee, Chung-Li; Ollis, David F.

doi:10.1016/0021-9517(83)90208-7

Cited by 255 publications

(54 citation statements)

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“…31 Ollis and coworkers studied the water-phase (313 K) photocatalytic degradation of chloroform over TiO 2 , with CO 2 and HCl as the main products. 32,33 Alvarez and coworkers demonstrated that a microbial-ZVI system provides faster transformation (CF half-life 1 day) than a ZVI-only system (half-life 7 days), yielding DCM as main product. 34 They showed that iron corrosion led to the formation of hydrogen, which was then used by anaerobic bacteria as an electron donor for CF dechlorination.…”

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Chloroform hydrodechlorination behavior of alumina‐supported Pd and PdAu catalysts

et al. 2013

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SignificanceChloroform is a common groundwater contaminant that is very difficult to remove. Chemically converting it into a less toxic form through heterogeneous catalysis is an attractive approach over conventional physical removal methods if it can be done economically. In this study, we explore the efficacy of supported precious metal catalysts for chloroform hydrodechlorination. We find that Pd/Al 2 O 3 is catalytically active for this reaction (6.4 L/g Pd /min) at room temperature, atmospheric pressure, in buffered water, and in the presence of hydrogen gas, and that Pd deposited on commercial Au/ Al 2 O 3 shows activities as high as 22.4 L/g Pd /min, suggestive of some Pd metal located on top of Au domains. The primary reaction product is methane, with selectivity values exceeding 90%. Surface-enhanced Raman spectroscopy shows evidence of chloroform adsorption and dechlorination on the catalyst surface under aqueous conditions. The results highlight the potential of ambient-condition reductive catalysis to remove chloroform from water.

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Chloroform hydrodechlorination behavior of alumina‐supported Pd and PdAu catalysts

et al. 2013

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“…In 1983, Ollis and coworker [8] showed the extent of adsorption of several chlorinated hydrocarbons in terms of the Langmuir adsorption isotherm. In 1985, Matsunaga et al [9] reported the photocatalytic activity of TiO 2 as a microbiocide effective at photokilling Lactobacillus acidophilus, Saccharomyces cerevisiae and Escherichia coli.…”

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confidence: 99%

A review of TiO2 nanoparticles

2011

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Climate change and the consumption of non-renewable resources are considered as the greatest problems facing humankind. Because of this, photocatalysis research has been rapidly expanding. TiO 2 nanoparticles have been extensively investigated for photocatalytic applications including the decomposition of organic compounds and production of H 2 as a fuel using solar energy. This article reviews the structure and electronic properties of TiO 2 , compares TiO 2 with other common semiconductors used for photocatalytic applications and clarifies the advantages of using TiO 2 nanoparticles. TiO 2 is considered close to an ideal semiconductor for photocatalysis but possesses certain limitations such as poor absorption of visible radiation and rapid recombination of photogenerated electron/hole pairs. In this review article, various methods used to enhance the photocatalytic characteristics of TiO 2 including dye sensitization, doping, coupling and capping are discussed. Environmental and energy applications of TiO 2 , including photocatalytic treatment of wastewater, pesticide degradation and water splitting to produce hydrogen have been summarized. Historical backgroundThe growth of industry worldwide has tremendously increased the generation and accumulation of waste byproducts. In general, the production of useful products has been focused on and the generation of waste byproducts has been largely ignored. This has caused severe environmental problems that have become a major concern. Researchers all over the world have been working on various approaches to address this issue. Photoinduced processes have been studied and various applications have been developed. One important technique for removing industrial waste is the use of light energy (electromagnetic radiation) and particles sensitive to this energy to mineralize waste which aids in its removal from solution. Titanium dioxide (TiO 2 ) is considered very close to an ideal semiconductor for photocatalysis because of its high stability, low cost and safety toward both humans and the environment.*Corresponding author (email: shipra.mital@gmail.com)In 1964, Kato et al.[1] published their work on the photocatalytic oxidation of tetralin (1,2,3,4-tetrahydronaphthalene) by a TiO 2 suspension, which was followed by McLintock et al. [2] investigating the photocatalytic oxidation of ethylene and propylene in the presence of oxygen adsorbed on TiO 2 . However, the most important discovery that extensively promoted the field of photocatalysis was the "Honda-Fujishima Effect" first described by Fujishima and Honda in 1972 [3]. This well-known chemical phenomenon involves electrolysis of water, which is related to photocatalysis. Photoirradiation of a TiO 2 (rutile) single crystal electrode immersed in an aqueous electrolyte solution induced the evolution of oxygen from the TiO 2 electrode and the evolution of hydrogen from a platinum counterelectrode when an anodic bias was applied to the TiO 2 working electrode. In 1977, Frank and Bard [4] examined the reduction of ...

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“…Semiconductor photocatalysis using UV irradiated titanium dioxide for the detoxification of hazardous compounds in aqueous phase, is now a mature field of study [1][2][3][4][5][6][7][8]. A number of studies on photocatalysis of wastewater containing organic and inorganic contaminants have been reviewed earlier [9].…”

Section: Introductionmentioning

confidence: 99%

Solar photocatalytic removal of metal ions from industrial wastewater

2008

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This article describes the photocatalytic reduction and deposition of four metal ions Cr(VI), Ni(II), Zn(II), and Cu(II) present in the wastewater from a chrome plating industry using solar energy irradiated TiO 2 . A parabolic trough reactor was used to carry out the reaction. Experiments were carried out to find an optimum dose of hole scavenger used (citric acid). The adsorption and reduction of the metal ions at different pH values was also investigated.It was observed that the solar photocatalytic process was effective in removing most of the metal ions in specific reaction conditions. Alkaline pH was found to be more suitable for removal of nickel and zinc. However, Cr(VI) reduced completely even at catalyst concentrations as low as 0.5 mg/L at pH 2. Maximum reaction was completed in the first 4 h of solar exposure.

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Heterogeneous photocatalysis: Degradation of dilute solutions of dichloromethane (CH2Cl2), chloroform (CHCl3), and carbon tetrachloride (CCl4) with illuminated TiO2 photocatalyst

Cited by 255 publications

References 3 publications

Chloroform hydrodechlorination behavior of alumina‐supported Pd and PdAu catalysts

Chloroform hydrodechlorination behavior of alumina‐supported Pd and PdAu catalysts

A review of TiO2 nanoparticles

Solar photocatalytic removal of metal ions from industrial wastewater

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