The removal of the toxic Hg(II) salts from water by photocatalysis

Khalil, Laila B.; Rophael, M.W.; Mourad, W.E.

doi:10.1016/s0926-3373(01)00285-5

Cited by 91 publications

(42 citation statements)

References 44 publications

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“…Due to the absence of dissolved oxygen in sample solution a higher reduction rate of mercury can be achieved. The results are in agreement with that reported in literature 37,44,45 and it must be emphasized that all experiments were conducted in nitrogen-saturated samples.…”

Section: Resultssupporting

confidence: 92%

“…The pH of the sample solutions was adjusted with NaOH, after the addition of the catalyst. In literature for comparison, catalyzed photo-reduction of mercury has been reported at pH 4 37,44 and the degradation of wastewaters (dyes) in the presence of TiO 2 with the additional effect of ultrasound, as low as 1-3. 47 The results obtained are consistent with those obtained by Wang et al 44 The surface properties of the TiO 2 semiconductor are strongly affected by solution pH which changes the potential of conduction band electrons.…”

Section: Optimization Of the Catalyzed Photo-reduction Systemsmentioning

confidence: 99%

“…36 Presently, photo-reduction with catalysts usually assists treatment of drinking water and industrial wastewater by the distribution of organic pollutants. Khalil et al 37 used a UV/TiO 2 system to remove Hg(II) salts from water and found that the photo-reduction efficiency was enhanced by the addition of methanol, which served as an H + scavenger. For a similar purpose in addition to TiO 2 , the following semiconductor materials are commonly used under visible or UV radiation: Ag-TiO 2 , ZnO, CdS or WO 3 .…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of the catalyzed photo-cold vapour generation for determination of mercury by AAS

Matusiewicz¹,

Stanisz²

2012

J. Braz. Chem. Soc.

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Nanopartículas de Ag suportadas em TiO 2 (Ag-TiO 2 ) foram usadas como catalisador na geração de vapor frio induzida por radiação UV com ácido fórmico, acoplado à absorção atômica para determinação do mercúrio total em amostras analíticas. A atividade redutora de Ag-TiO 2 foi comparada com dois catalisadores semicondutores: TiO 2 não modificado e ZnO. O efeito do tipo de catalisador, sua concentração na amostra analisada, pH da amostra, concentração do ácido fórmico e tempo de irradiação ultravioleta foi investigado. Na presença de ácido fórmico, Ag-TiO 2 foi o mais eficiente na redução de mercúrio. Nas condições experimentais otimizadas, a recuperação de mercúrio em quatro materiais de referência contendo 0,20-1,99 µg g -1 Hg foi de 95-99% dos valores certificados. O desvio padrão relativo para amostras foi igual ou melhor do que 11%. A análise de materiais de referência certificados (correspondentes a amostras ambientais e biológicas) mostrou a potencialidade do método Ag-TiO 2 -UV-CVGAAS na determinação de mercúrio em amostras analíticas no nível de ultra-traço.Nano-Ag particles loaded on TiO 2 (Ag-TiO 2 ) were used as catalyst for the UV-induced cold vapour generation with formic acid coupled to atomic absorption for determination of total mercury in analytical samples. The reducing activity of Ag-TiO 2 was compared with two semiconductor catalysts: unmodified TiO 2 and ZnO. The effect of catalyst type, its concentration in the analyzed sample, sample pH, formic acid concentration and ultraviolet irradiation time have been investigated. In the presence of formic acid, most effective in the reduction of mercury was Ag-TiO 2 . Under the optimized experimental conditions recovery of mercury in four reference materials containing 0.20-1.99 µg g -1 Hg was 95-99% of certificate values. The relative standard deviation for samples was equal to or better than 11%. Certified reference materials (corresponding to biological and environmental samples) analysis using the Ag-TiO 2 -UV-CVGAAS method revealed that it is promising for mercury determination in analytical samples at ultratrace level.

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Section: Resultssupporting

confidence: 92%

Section: Optimization Of the Catalyzed Photo-reduction Systemsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evaluation of the catalyzed photo-cold vapour generation for determination of mercury by AAS

Matusiewicz¹,

Stanisz²

2012

J. Braz. Chem. Soc.

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“…The adsorption and photocatalytic reduction techniques by TiO 2 materials appear to be most promising because of their high efficiency and simplicity of operation. More importantly, Hg(II) can be removed from the solution by photocatalytic reduction with TiO 2 to elemental mercury which can be safely recovered [3]. Some literatures have illustrated the adsorption and photocatalytic reduction of Hg(II) and Cr(VI) by the TiO 2 powders and the effect of only solution pH has been covered [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Removal of aqueous toxic Hg(II) by synthesized TiO2 nanoparticles and TiO2/montmorillonite

Dou

Dupont

Pan

et al. 2011

Chemical Engineering Journal

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Abstract:The adsorption and photocatalytic reduction of toxic Hg(II) in aqueous solutions at different temperatures were investigated with synthesized TiO 2 nanoparticles and TiO 2 /montmorillonite. The latter were tested by TGA, BET, TEM and XRD methods. The 9.1nm diameter TiO 2 nanoparticles had a specific surface area exceeding 200 m 2 g -1 . High purity anatase TiO 2 nanoparticles were produced at 500 C.

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“…Catalytic applications of titanium dioxide have been studied for decades regarding the elimination of environmental pollutants and, more recently, for photocatalytic processes concerning the degradation of pollutants in air, water and soil [3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of TiO2 nano powder by the sol-gel method and its use as a photocatalyst

Karami

2010

JICS

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In this work the titanium dioxide powder was prepared by the optimized and simple Sol-Gel method and then characterized. The gelling pH was set to values of 3 (TiO 2 -A), 7 (TiO 2 -N) and 9 (TiO 2 -B) to observe the effect on the properties of the material. In these three cases nanoparticulated materials were obtained with particle sizes between 10nm and 20nm. The larger surface areas were obtained at pH 3, which is several times larger than the others. Furthermore, with the gelling condition pH 3, it was possible to synthesize pure anatase phase titania. Some preliminary results on the test of the photocatalytic activity of the synthesized materials in the reduction of nitric oxide are presented. Based on these results the nanoparticle TiO2, which was prepared in acidic pH 3 with the pure anatase phase and the lowest particle size has the highest reactivity for the photocatalytic reduction of nitric oxide.

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The removal of the toxic Hg(II) salts from water by photocatalysis

Cited by 91 publications

References 44 publications

Evaluation of the catalyzed photo-cold vapour generation for determination of mercury by AAS

Evaluation of the catalyzed photo-cold vapour generation for determination of mercury by AAS

Removal of aqueous toxic Hg(II) by synthesized TiO2 nanoparticles and TiO2/montmorillonite

Synthesis of TiO2 nano powder by the sol-gel method and its use as a photocatalyst

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