Application of Photocatalytic Reduction Method with TiO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; for Gold Recovery

Wahyuni, Endang Tri

doi:10.11648/j.ajac.20150306.15

Cited by 6 publications

(11 citation statements)

References 25 publications

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“…Photodeposition for gold recovery can also be obtained through reduction under UV light in the presence of TiO 2 photocatalyst [17]. In this step, the gold is dissolved in the aqueous solution formed as Au 3+ ions and then to be reduced as shown by reaction (12):…”

Section: Photoreduction Methods Over Tio 2 For Metal Recovery and Dopimentioning

confidence: 99%

“…The platinum salt is dissolved to form an ion of PtCl 4 4+ and/or Pt 2+ ions, and the reactions of the photoreduction are represented by Eqs. (17) and 18[52]:…”

Section: Photoreduction Methods Over Tio 2 For Metal Recovery and Dopimentioning

confidence: 99%

“…This is a reduction path. The use of the electrons from TiO 2 for some reducible metal ions such as Ag(I) [5][6][7][8][9][10][11][12][13], Au(III) [13][14][15][16][17], Cr(VI) [18][19][20][21][22][23], Cu (II) [24][25][26], Hg(II) [27,28], and U(VI) [29,30] has also been developed.…”

Section: Introductionmentioning

confidence: 99%

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Photoreduction Processes over TiO2 Photocatalyst

Wahyuni¹,

Aprilita²

2019

Photocatalysts - Applications and Attributes

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This chapter presents the study of TiO 2 photocatalyst for the photoreduction of several reducible chemicals. The photocatalytic reduction of several toxic metal ions, including Ag (I), Cu(II), Cr(VI), Hg(II), and U(VI) in the presence of TiO 2 , in order to decrease their toxicity, is described. Photodeposition of the noble metals, such as Ag(I), Au(III), Pt(IV), and Pd(II) for doping purposes by photocatalytic reduction over TiO 2 , is also addressed. Conversion of the greenhouse gas of CO 2 into useful hydrocarbons and methanol by photocatalytic reduction using TiO 2 photocatalyst is highlighted. Several operating parameters in photoreduction processes that are photocatalyst dose, time of the irradiation, pH of the solution, and the initial concentration of the substrates (the reducible chemicals) are also reviewed.

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Section: Photoreduction Methods Over Tio 2 For Metal Recovery and Dopimentioning

confidence: 99%

“…The platinum salt is dissolved to form an ion of PtCl 4 4+ and/or Pt 2+ ions, and the reactions of the photoreduction are represented by Eqs. (17) and 18[52]:…”

Section: Photoreduction Methods Over Tio 2 For Metal Recovery and Dopimentioning

confidence: 99%

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Photoreduction Processes over TiO2 Photocatalyst

Wahyuni¹,

Aprilita²

2019

Photocatalysts - Applications and Attributes

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“…In the present study, a mesoporous Pd-TiO 2 photocatalyst active under visible light is considered. A key preparation step, photoreducing the Pd-TiO 2 using near-UV light is implemented to enhance its photocatalyst activity [33]. It is shown, that the near-UV light photoreduced mesoporous Pd-TiO 2 displays a 2.51 eV energy band gap.…”

Section: Introductionmentioning

confidence: 99%

“…The near-UV light photoreduced Pd-TiO 2 photocatalyst is evaluated in a Photo-CREC Water-II Reactor (PCW-II Reactor) under visible light [34]. Ethanol is employed as an organic scavenger to help with electron-hole separation [33]. The promoted mesoporous Pd-TiO 2 energy band gap reduction enhances light absorption in the visible region [35].…”

Section: Introductionmentioning

confidence: 99%

Photoreduction of a Pd-Doped Mesoporous TiO2 Photocatalyst for Hydrogen Production under Visible Light

2020

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Photoreduction with visible light can enhance the photocatalytic activity of TiO2 for the production of hydrogen. In this article, we present a strategy to photoreduce a palladium-doped TiO2 photocatalyst by using near-UV light prior to its utilization. A sol-gel methodology was employed to prepare the photocatalysts with different metal loadings (0.25–5.00 wt% Pd). The structural and morphological characteristics of the synthesized Pd-TiO2 were analyzed by using X-ray Diffraction (XRD), BET Surface Area (SBET), TemperatureProgrammed Reduction (TPR), Chemisorption and X-ray Photoelectron Spectroscopy (XPS). Hydrogen was produced by water splitting under visible light irradiation using ethanol as an organic scavenger. Experiments were developed in the Photo-CREC Water-II (PCW-II) Reactor designed at the CREC-UWO (Chemical Reactor Engineering Centre). It was shown that the mesoporous 0.25 wt% Pd-TiO2 with 2.5 1eV band gap exhibits, under visible light, the best hydrogen production performance, with a 1.58% Quantum Yield being achieved.

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Photocatalytic Recovery of Gold from a Non-Cyanide Gold Plating Solution as Au Nanoparticle-Decorated Semiconductors

et al. 2022

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In this work, a photocatalytic process was carried out to recover gold (Au) from the simulated non-cyanide plating bath solution. Effects of semiconductor types (TiO 2 , WO 3 , Nb 2 O 3 , CeO 2 , and Bi 2 O 3 ), initial pH of the solution (3−10), and type of complexing agents (Na 2 S 2 O 3 and Na 2 SO 3 ) and their concentrations (1−4 mM each) on Au recovery were explored. Among all employed semiconductors, TiO 2 exhibited the highest photocatalytic activity to recover Au from the simulated spent plating bath solution both in the absence and presence of complexing agents, in which Au was completely recovered within 15 min at a pH of 6.5. The presence of complexing agents remarkably affected the size of deposited Au on the TiO 2 surface, the localized surface plasmon effect (LSPR) behavior, and the valence band (VB) edge position of the obtained Au/TiO 2 , without a significant change in the textural properties or the band gap energy. The photocatalytic activity of the obtained Au/TiO 2 tested via two photocatalytic processes depended on the common reduction mechanism rather than the textural or optical properties. As a result, the Au/TiO 2 NPs obtained from the proposed recovery process are recommended for use as a photocatalyst for the reactions occurring at the conduction band rather than at the valence band. Notably, they exhibited good stability after the fifth photocatalytic cycle for Au recovery from the actual cyanide plating bath solution.

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Application of Photocatalytic Reduction Method with TiO<sub>2</sub> for Gold Recovery

Cited by 6 publications

References 25 publications

Photoreduction Processes over TiO2 Photocatalyst

Photoreduction Processes over TiO2 Photocatalyst

Photoreduction of a Pd-Doped Mesoporous TiO2 Photocatalyst for Hydrogen Production under Visible Light

Photocatalytic Recovery of Gold from a Non-Cyanide Gold Plating Solution as Au Nanoparticle-Decorated Semiconductors

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