Reduction and removal of mercury from water using arginine-modified TiO2

Skubal, Laura R.; Meshkov, N.K.

doi:10.1016/s1010-6030(02)00045-x

Cited by 74 publications

(27 citation statements)

References 17 publications

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“…This may be due to the co-production of the metallic or colloidal state of these transition metal ions, and subsequently these metallic forms can catalytically decompose THB. In addition, those hydride-forming elements may also cause gas-phase interference in the Mechanism for photo-CVG reaction Many reports have discussed the possible mechanisms of photocatalytic reduction of mercury in the UV/TiO 2 system [27][28][29][30][31], and these are briefly summarized here. After absorption of sufficient energetic light (λ<387 nm) by TiO 2 , an electron is promoted to the higher energy conduction band (cb), leaving a positively charged hole in the valence band (vb).…”

Section: Interference Of Transition Metalsmentioning

confidence: 99%

Photo-induced cold vapor generation with low molecular weight alcohol, aldehyde, or carboxylic acid for atomic fluorescence spectrometric determination of mercury

et al. 2007

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With UV irradiation, Hg 2+ in aqueous solution can be converted into Hg 0 cold vapor by low molecular weight alcohols, aldehydes, or carboxylic acids, e.g., methanol, formaldehyde, acetaldehyde, glycol, 1,2-propanediol, glycerol, acetic acid, oxalic acid, or malonic acid. It was found that the presence of nano-TiO 2 more or less improved the efficiency of the photo-induced chemical/cold vapor generation (photo-CVG) with most of the organic reductants. The nano-TiO 2 -enhanced photo-CVG systems can be coupled to various analytical atomic spectrometric techniques for the determination of ultratrace mercury. In this work, we evaluated the application of this method to the atomic fluorescence spectrometric (AFS) determination of mercury in cold vapor mode. Under the optimized experimental conditions, the instrumental limits of detection (based on three times the standard deviation of 11 measurements of a blank solution) were around 0.02-0.04 μg L −1 , with linear dynamic ranges up to 15 μg L −1 .The interference of transition metals and the mechanism of the photo-CVG are briefly discussed. Real sample analysis using the photo-CVG-AFS method revealed that it was promising for water and geological analysis of ultralow levels of mercury.

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Section: Interference Of Transition Metalsmentioning

confidence: 99%

Photo-induced cold vapor generation with low molecular weight alcohol, aldehyde, or carboxylic acid for atomic fluorescence spectrometric determination of mercury

et al. 2007

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“…Titanium dioxide is a semiconductor photocatalyst for organic compounds degradation [11][12][13][14][15][16][17][18][19] . When TiO 2 absorbs light having energy ≥ 3,2 eV (band gap energy [13][14], electrons and holes are formed in the conduction and valence band respectively (ecb and h + vb ) 11 -16 .…”

Section: Principle Of the Methodsmentioning

confidence: 99%

Studies on Simulated Ageing of Paper by Photochemical Degradation

2005

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The study of the ageing of two paper types was performed on monitoring it during a simulated process by means of the measure of the photocatalytic degradation of the paper cellulose. Such evaluation was possible due to the combined responses of a photosensor based on titanium dioxide in suspension, of an enzymatic biosensor based on superoxide dismutase (SOD), of a specific conductivity sensor and of an enzymatic biosensor based on glucose oxidase.

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“…[16][17][18] It has been reported that UV irradiation can be used to reduce some heavy metal ions to their metal or lower oxidation state intermediates in many samples, but most often with TiO2 or ZnO as a catalyst. [19][20][21][22][23] On the other hand, some metals in their organic states can also be converted to the inorganic state in aqueous solution with or without oxidation reagent, i.e., Hg 2+ , with UV irradiation, and then such metals can be determined by liquid chromatography and/or atomic spectrometry. [24][25][26][27] But these techniques all need a separation or extra pretreatment procedure.…”

Section: Introductionmentioning

confidence: 99%