Photocatalytic reduction of selenite and selenate using TiO2 photocatalyst

Nguyen, Vi Nu Hoai; Beydoun, Donia; Amal, Rose

doi:10.1016/j.jphotochem.2004.09.015

Cited by 66 publications

(25 citation statements)

References 30 publications

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“…But reduction by potassium or sodium borohydride has some disadvantages such as unstable reagent and interference of transitional metal ions. In the past years, photo-induced reduction or CVG was reported as a technique for remediation of heavy metal contamination [16][17][18][19]. This chemical vapour generation, in presence of organic acid under UV irradiation, was also coupled with atomic spectrometry for the analysis of selenium, mercury and other metal or non-metal element [20,21], which proved that the green, simple and selective UV-CVG is a useful new alternative to the conventional KBH 4 system.…”

Section: Introductionmentioning

confidence: 97%

Simple interface of high-performance liquid chromatography–atomic fluorescence spectrometry hyphenated system for speciation of mercury based on photo-induced chemical vapour generation with formic acid in mobile phase as reaction reagent

Yin

Liu

et al. 2008

Journal of Chromatography A

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Photo-induced chemical vapour generation (CVG) with formic acid in mobile phase as reaction reagent was developed as interface to online couple HPLC with atomic fluorescence spectrometry for the separation and determination of inorganic mercury, methylmercury (MeHg), ethylmercury (EtHg) and phenylmercury (PhHg). In the developed procedure, formic acid in mobile phase was used to decompose organomercuries and reduce Hg 2+ to mercury cold vapour under UV irradiation. Therefore, no post-column reagent was used and the flow injection system in traditional procedure is omitted. A number of operating parameters including pH of mobile phase, concentration of formate, flow rate of mobile phase, length of PTFE reaction coil, flow rate of carrier gas and Na 2 S 2 O 3 in sample matrix were optimized. The limits of detection at the optimized conditions were 0.085, 0.033, 0.029 and 0.038 g L −1 for inorganic mercury, MeHg, EtHg and PhHg, respectively. The developed method was validated by determination of certified reference material DORM-2 and was further applied in analyses of seafood samples from Yantai port, China. The UV-CVG with formic acid simplifies the instrumentation and reduces the analytical cost significantly.

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Section: Introductionmentioning

confidence: 97%

Simple interface of high-performance liquid chromatography–atomic fluorescence spectrometry hyphenated system for speciation of mercury based on photo-induced chemical vapour generation with formic acid in mobile phase as reaction reagent

Yin

Liu

et al. 2008

Journal of Chromatography A

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“…For some years UV irradiation has been used to reduce metal ions to their lower oxidation states or zero-valence states. [13][14][15][16] This chemical vapour generation (CVG), in the presence of organic acid under UV irradiation, has also been coupled with atomic spectrometry for the analysis of selenium and mercury. 17,18 Compared with the traditional KBH 4 system, the UV CVG technique is green, simple and selective.…”

Section: Introductionmentioning

confidence: 99%

Photo-induced chemical vapour generation with formic acid: novel interface for high performance liquid chromatography-atomic fluorescence spectrometry hyphenated system and application in speciation of mercury

Yin

Liu

et al. 2007

J. Anal. At. Spectrom.

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Based on a novel photo-induced chemical vapour generation (CVG) with formic acid instead of the conventional K 2 S 2 O 8 /KBH 4 system, an on-line coupled HPLC and atomic fluorescence spectrometry procedure was developed for the speciation of inorganic mercury, methylmercury (MeHg), ethylmercury (EtHg) and phenylmecury (PhHg). Under UV irradiation, the decomposition of organic mercury species and the reduction of Hg 2+ could be completed in one step with this proposed photo-induced CVG system. The novel CVG system used formic acid only, which simplified the flow system and avoided the possibility of contamination originating from additional chemicals. A number of operating parameters including organic acid species, concentration of formic acid, pH, flow rate of formic acid and flow rate of carrier gas were optimized, and comparable method sensitivities with the conventional K 2 S 2 O 8 /KBH 4 system were obtained. The limits of detection at the optimized conditions were 0.81, 0.20 and 0.87 mg L À1 forMeHg, EtHg and PhHg, respectively. The developed method was validated by determination of certified reference material DORM-2 and was further applied in determination of seafood samples. The new CVG system is simple, environmentally benign, and inexpensive for the speciation analysis of mercury. It is expected to have similar applications in other analytical atomic spectrometric techniques as well as speciation of other organic metal compounds.

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“…Since the reduction potential of the TiO 2 conduction band electron is about −0.2 eV in acidic condition, 23 it has enough energy to reduce selenite to selenium atom. The standard reduction potentials of selenium cations are shown in the following equation 24 although these redox potentials can be altered once they have been adsorbed on TiO 2 nanoparticles.…”

Section: Resultsmentioning

confidence: 99%

“…24 About 4.7 to 4.8 μg/mL of selenate was determined when 5.0 μg/mL of selenate was mixed with the synthesized nanoparticles and irradiated for 3 h. In addition, no signal change of selenium at the collected nanoparticles was observed except for the dark adsorption. For organic selenide, no signal increase of the adsorbed selenium on the nanoparticles was observed, indicating the absence of any dark adsorption or photoreaction.…”

Section: +mentioning

confidence: 95%

Separation of Selenite from Inorganic Selenium Ions using TiO₂Magnetic Nanoparticles

Kim¹,

Lim²

2013

Bulletin of the Korean Chemical Society

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A simple and quick separation technique for selenite in natural water was developed using TiO 2 @SiO 2 /Fe 3 O 4 nanoparticles. For the synthesis of nanoparticles, a polymer-assisted sol-gel method using hydroxypropyl cellulose (HPC) was developed to control particle dispersion in the synthetic procedure. In addition, titanium butoxide (TBT) precursor, instead of the typical titanium tetra isopropoxide, was used for the formation of the TiO 2 shell. The synthesized nanoparticles were used to separate selenite (Se 4+) in the presence of Se 6+ or selenium anions for the photocatalytic reduction to Se 0 atom on the TiO 2 shell, followed by magnetic separation using Fe 3 O 4 nanoparticles. The reduction efficiency of the photocatalytic reaction was 81.4% at a UV power of 6W for 3 h with a dark adsorption of 17.5% to the nanoparticles, as determined by inductively coupled plasma-mass spectrometry (ICP-MS). The developed separation method can be used for the speciation and preconcentration of selenium cations in environmental and biological analysis.

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Photocatalytic reduction of selenite and selenate using TiO2 photocatalyst

Cited by 66 publications

References 30 publications

Simple interface of high-performance liquid chromatography–atomic fluorescence spectrometry hyphenated system for speciation of mercury based on photo-induced chemical vapour generation with formic acid in mobile phase as reaction reagent

Simple interface of high-performance liquid chromatography–atomic fluorescence spectrometry hyphenated system for speciation of mercury based on photo-induced chemical vapour generation with formic acid in mobile phase as reaction reagent

Photo-induced chemical vapour generation with formic acid: novel interface for high performance liquid chromatography-atomic fluorescence spectrometry hyphenated system and application in speciation of mercury

Separation of Selenite from Inorganic Selenium Ions using TiO₂Magnetic Nanoparticles

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Photocatalytic reduction of selenite and selenate using TiO2 photocatalyst

Cited by 66 publications

References 30 publications

Simple interface of high-performance liquid chromatography–atomic fluorescence spectrometry hyphenated system for speciation of mercury based on photo-induced chemical vapour generation with formic acid in mobile phase as reaction reagent

Simple interface of high-performance liquid chromatography–atomic fluorescence spectrometry hyphenated system for speciation of mercury based on photo-induced chemical vapour generation with formic acid in mobile phase as reaction reagent

Photo-induced chemical vapour generation with formic acid: novel interface for high performance liquid chromatography-atomic fluorescence spectrometry hyphenated system and application in speciation of mercury

Separation of Selenite from Inorganic Selenium Ions using TiO2Magnetic Nanoparticles

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Separation of Selenite from Inorganic Selenium Ions using TiO₂Magnetic Nanoparticles