Kinetics of the photoassisted catalytic oxidation of Pb(II) in TiO2 suspensions

Torres, Joan Ramón; Cervera-March, S.

doi:10.1016/0009-2509(92)85134-w

Cited by 27 publications

(22 citation statements)

References 10 publications

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“…We use the reduction of Ag ϩ by photogenerated electrons 16,17 and the oxidation of Pb 2ϩ by photogenerated holes 18,19 to create insoluble products that mark the locations of the reactions described below:…”

Section: Methodsmentioning

confidence: 99%

Structure Se nsitivity of Photochemical Oxidation and Reduction Reactions on SrTiO₃ Surfaces

Giocondi

Rohrer

2003

Journal of the American Ceramic Society

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The photochemical reduction of Ag+ and oxidation of Pb2+ from aqueous solution by SrTiO3 leave insoluble reaction products (silver and PbO2, respectively) on the surface. Microscopic analysis has been used to relate the rates of these two reactions to the structure and orientation of SrTiO3 surfaces. The nonpolar (100) surface is the most reactive for silver reduction and the composition of the termination layer does not influence this reaction. On the polar (111) surface, the reduction and oxidation reactions occur on terraces with different terminations and opposite charges; this leads to a nonuniform distribution of reaction products. The polar (110) surface is the least reactive, and the majority of the reaction products are observed at steps along <100> directions where the more reactive {100} surfaces are exposed. The distribution of oxidation products found on (110) terraces is also influenced by the composition and charge of the surface termination. The results show that the photochemical reactivity of SrTiO3 is anisotropic and that, on polar surfaces, dipolar fields arising from charged surface domains influence the transport of photogenerated charge carriers and promote spatially selective oxidation and reduction reactions.

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Section: Methodsmentioning

confidence: 99%

Structure Se nsitivity of Photochemical Oxidation and Reduction Reactions on SrTiO₃ Surfaces

Giocondi

Rohrer

2003

Journal of the American Ceramic Society

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“…Metode penurunan konsentrasi yang juga mampu menghilangkan sifat racun ion Pb(II) adalah fotokatalitik oksidasi untuk ion Pb(II) [13,14,15] dan fotokatalitik reduksi untuk ion Cu(II) [15,16,17,18] oleh adanya fotokatalis Ti02 dan sinar UV. Dalam proses fotokatalisis, yang dilakukan dengan cara menyinari larutan yang tersuspensi oleh Ti02 dengan sinar UV, Ti02 dapat melepaskan elektron dengan membentuk radikal OH [13, 14,15,16,17,18]. Elektron tersebut mampu menginduksi reaksi reduksi [15,16,17,18] dan radikal OH dapat bertindak sebagai oksidator kuat [13,14,15].…”

Section: Pendahuluanunclassified

A Study on Photo-Fenton Method for Simulatenous and Synergic Decreasing Concentration of Pb(II) and Cu(II) in the Solution

et al. 2019

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To prevent an environmental pollution by hazardous heavy metals, in the present study, a simulatenous decrease of the concentration of Pb((II) and Cu(II) in the solution by photo-Fenton method has been systematically studied. Photo-Fenton process proceeded in a close reactor by batch technique. The process was conducted by exposure solutions containing Pb(II) and Cu(II) ions, and Fenton’s reagent (Fe2+ and H2O2) under UV-A lamp. In this study, the initial concentations of Pb(II) and Cu(II), and the exposure time were optimized. The synergyc effect that may be appeared on the decrease of Pb(II) and Cu(II) ion concentrations simultaneously through photo-Fenton process was also addressed. The concentrations of Pb(II) and Cu(II) in the solution were determined by AAS. The research results exhibited that photo-Fenton process could decrease Pb(II) and Cu(II) concentrations, and the maximum decreases, 46.12 % dan 16.86% for Pb(II) and for Cu(II) respecticely, were found by applying both initial concentration of Pb(II) and Cu(II) as much 35 mg/L, and 60 min of the time. The concentration decreases of Pb (II) and Cu(II) were results of oxidation by OH and by electron to form PbO2 and Cu particles respectively as probed by EDX data. Furthermore, photo-Fenton process toward a solution containing Pb(II) and Cu(II) ions allowed oxidation of Pb(II) and reduction of Cu(II) simultaneously and showed a synergic effect. Such effect was demonstrated by the fact that the presence of Cu(II) ion in the photo-Fenton process of Pb(II) solution could improve the Pb(II) oxidation and the highest improvement of Pb(II) oxidation (81.06%) was shown by 35 mg/L of the Cu(II) concentration. Similarly, the presence of Pb(II) in the photo-Fenton process of Cu(II) solution could enhance the reduction of Cu(II), and the highest effect on the Cu(II) reduction enhancement was exhibited by 35 mg/L of the Pb(II) concentration.

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“…Consequently, lead pollution is mainly anthropogenic, coming from industrial effluents. In our previous reviews [7,10] we cited a number of early papers [75,78,[165][166][167][168][169][170][171][172][173][174][175][176][177][178][179][180], but information continues to be rather scant. Polyvinyl chloride (PVC) pipes now in use also contain lead compounds that can be leached resulting in high lead concentrations in drinking water.…”

Section: Leadmentioning

confidence: 99%

New Advances in Heterogeneous Photocatalysis for Treatment of Toxic Metals and Arsenic

Litter

Quici

2014

Nanomaterials for Environmental Protection

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Kinetics of the photoassisted catalytic oxidation of Pb(II) in TiO2 suspensions

Cited by 27 publications

References 10 publications

Structure Se nsitivity of Photochemical Oxidation and Reduction Reactions on SrTiO₃ Surfaces

Structure Se nsitivity of Photochemical Oxidation and Reduction Reactions on SrTiO₃ Surfaces

A Study on Photo-Fenton Method for Simulatenous and Synergic Decreasing Concentration of Pb(II) and Cu(II) in the Solution

New Advances in Heterogeneous Photocatalysis for Treatment of Toxic Metals and Arsenic

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Kinetics of the photoassisted catalytic oxidation of Pb(II) in TiO2 suspensions

Cited by 27 publications

References 10 publications

Structure Se nsitivity of Photochemical Oxidation and Reduction Reactions on SrTiO3 Surfaces

Structure Se nsitivity of Photochemical Oxidation and Reduction Reactions on SrTiO3 Surfaces

A Study on Photo-Fenton Method for Simulatenous and Synergic Decreasing Concentration of Pb(II) and Cu(II) in the Solution

New Advances in Heterogeneous Photocatalysis for Treatment of Toxic Metals and Arsenic

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Structure Se nsitivity of Photochemical Oxidation and Reduction Reactions on SrTiO₃ Surfaces

Structure Se nsitivity of Photochemical Oxidation and Reduction Reactions on SrTiO₃ Surfaces