A simple and environmentally friendly method of preparing sulfide photocatalyst

Wu, Chien-Hsing; Cho, Hui Fang; Chang, Wen Sheng; Lee, Tai Chou

doi:10.1016/j.ces.2009.01.052

Cited by 26 publications

(5 citation statements)

References 40 publications

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“…The added amount of Ag and In doped in ZnS lattice was calculated to be 5 at%, but the actual amount was only 2.96 at% based on the EDS results as shown in Figure 3, panel a. The pattern of as-prepared (AgIn) x Zn 2(1−x) S 2 nanorod was well agreed with that of previous work by Wu et al 45 The (AgIn) x Zn 2(1−x) S 2 sphalerite had a face centered cubic structure with a = 5.41 Å. After coating with Ag 2 S nano particles, the additional peaks of Ag 2 S appeared in the (AgIn) x Zn 2(1−x) S 2 /Ag 2 S nanocomposite patterns.…”

Section: Resultssupporting

confidence: 88%

“…Preparation of (AgIn) x Zn 2(1−x) S 2 Nanorods. On the basis of the literature report 45 to fabricate a high photocatalytic activity of (AgIn) x Zn 2(1−x) S 2 solid solution, the molar ratio of AgNO 3 , InCl 3 , and Zn(CH 3 COO) 2 •2H 2 O precursors was set to 1:1:10. In our typical preparation, to prepare about 150 mg of (AgIn) x Zn 2(1−x) S 2 powder, 21.31 mg of AgNO 3 , 27.76 mg of InCl 3 , and 275 mg of Zn(CH 3 COO) 2 dihydrate were first dissolved in 40 mL of oleylamine.…”

Section: Methodsmentioning

confidence: 99%

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Facile Synthesis of n-type (AgIn)_xZn_2(1–x)S₂/p-type Ag₂S Nanocomposite for Visible Light Photocatalytic Reduction To Detoxify Hexavalent Chromium

Abdullah

Kuo

2015

ACS Appl. Mater. Interfaces

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n-type (AgIn)(x)Zn(2(1-x))S2/p-type Ag2S nanocomposites with 10%, 20%, and 30% Ag2S loading were successfully synthesized via the simple solvothermal and sol gel methods. The as-prepared nanocomposites were characterized, and their visible light photocatalytic reductions were tested for detoxification of hexavalent chromium (Cr(VI)). The results showed only 20 mg of the as-prepared nanocomposites could reduce 100 mL of 20 ppm potassium dichromate by almost 100% in less than 90 min without adding any hole scavenger agents and pH adjustment (pH = 7). The good photocatalytic reduction was related to the narrower bandgap of (AgIn)(x)Zn(2(1-x))S2 solid solution because of the hybridized orbitals of Ag, In, Zn, and S and low recombination rate of photogenerated electron and hole pairs due to the effectiveness of p-type Ag2S and n-type (AgIn)(x)Zn(2(1-x))S2 nanoheterojunctions. This work not only gives a contribution to the creation of visible light photocatalysis for wide-bandgap semiconductors, but also extends our technological viewpoints in designing highly efficient metal sulfide photocatalyst. To the best of our knowledge, this work is the first finding of a high photocatalytic reduction of hexavalent chromium under visible light illumination by simultaneously using both concepts of p-n nanoheterojunction and solid solution in our photocatalyst design. In this present work, these concepts were used to replace the use of hole scavenger agents, which were commonly used by many other works to retard the recombination rate of photoinduced electron and hole pairs for photodegradation of hexavalent chromium.

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Section: Resultssupporting

confidence: 88%

Section: Methodsmentioning

confidence: 99%

Facile Synthesis of n-type (AgIn)_xZn_2(1–x)S₂/p-type Ag₂S Nanocomposite for Visible Light Photocatalytic Reduction To Detoxify Hexavalent Chromium

Abdullah

Kuo

2015

ACS Appl. Mater. Interfaces

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“…The temperature was maintained at 25 °C during the reaction, and hydrogen gas was collected for at least 5 h using a water displacement method. 29 The evolved gas was analyzed using a Shimadzu GC-14 gas chromatograph. Apparent quantum yields were determined using a compact monochromator (Sciencetech 9030) for the wavelength-dependent photocatalytic activity.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

“…The intensity was set at 100 mW/cm 2 and monitored by an optical meter (Newport 1918-R). The temperature was maintained at 25 °C during the reaction, and hydrogen gas was collected for at least 5 h using a water displacement method . The evolved gas was analyzed using a Shimadzu GC-14 gas chromatograph.…”

Section: Experimental Sectionmentioning

confidence: 99%

Plasmonically Enhanced Photocatalytic Hydrogen Production from Water: The Critical Role of Tunable Surface Plasmon Resonance from Gold–Silver Nanoshells

Liu

et al. 2016

ACS Appl. Mater. Interfaces

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Gold-silver nanoshells (GS-NSs) having a tunable surface plasmon resonance (SPR) were employed to facilitate charge separation of photoexcited carriers in the photocalytic production of hydrogen from water. Zinc indium sulfide (ZnIn2S4; ZIS), a visible-light-active photocatalyst, where the band gap varies with the [Zn]/[In] ratio, was used as a model ZIS system (E(g) = 2.25 eV) to investigate the mechanisms of plasmonic enhancement associated with the nanoshells. Three types of GS-NS cores with intense absorptions centered roughly at 500, 700, and 900 nm were used as seeds for preparing GS-NS@ZIS core-shell structures via a microwave-assisted hydrothermal reaction, yielding core-shell particles with composite diameters of ∼200 nm. Notably, an interlayer of dielectric silica (SiO2) between the GS-NSs and the ZIS photocatalyst provided another parameter to enhance the production of hydrogen and to distinguish the charge-transfer mechanisms. In particular, the direct transfer of hot electrons from the GS-NSs to the ZIS photocatalyst was blocked by this layer. Of the 10 particle samples examined in this study, the greatest hydrogen gas evolution rate was observed for GS-NSs having a SiO2 interlayer thickness of ∼17 nm and an SPR absorption centered at ∼700 nm, yielding a rate 2.6 times higher than that of the ZIS without GS-NSs. The apparent quantum efficiencies for these core-shell particles were recorded and compared to the absorption spectra. Analyses of the charge-transfer mechanisms were evaluated and are discussed based on the experimental findings.

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“…Many reports have focused on the synthesis of metal chalcogenide nanoparticles and their assembled structures [2][3][4][5]. Among many metal chalcogenide nanoparticles, silver sulfide nanoparticle has attracted considerable attention because of its being potential prospective optoelectronic and thermoelectric materials, such as photoanodes, photoconductors, IR detectors and superionic conductors [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Controllable synthesis of floatable nanocrystalline Ag2S and Ag by a silane coupling agent-modified solvothermal method

Fan

Jing

et al. 2012

Materials Research Bulletin

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A simple and environmentally friendly method of preparing sulfide photocatalyst

Cited by 26 publications

References 40 publications

Facile Synthesis of n-type (AgIn)_xZn_2(1–x)S₂/p-type Ag₂S Nanocomposite for Visible Light Photocatalytic Reduction To Detoxify Hexavalent Chromium

Facile Synthesis of n-type (AgIn)_xZn_2(1–x)S₂/p-type Ag₂S Nanocomposite for Visible Light Photocatalytic Reduction To Detoxify Hexavalent Chromium

Plasmonically Enhanced Photocatalytic Hydrogen Production from Water: The Critical Role of Tunable Surface Plasmon Resonance from Gold–Silver Nanoshells

Controllable synthesis of floatable nanocrystalline Ag2S and Ag by a silane coupling agent-modified solvothermal method

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A simple and environmentally friendly method of preparing sulfide photocatalyst

Cited by 26 publications

References 40 publications

Facile Synthesis of n-type (AgIn)xZn2(1–x)S2/p-type Ag2S Nanocomposite for Visible Light Photocatalytic Reduction To Detoxify Hexavalent Chromium

Facile Synthesis of n-type (AgIn)xZn2(1–x)S2/p-type Ag2S Nanocomposite for Visible Light Photocatalytic Reduction To Detoxify Hexavalent Chromium

Plasmonically Enhanced Photocatalytic Hydrogen Production from Water: The Critical Role of Tunable Surface Plasmon Resonance from Gold–Silver Nanoshells

Controllable synthesis of floatable nanocrystalline Ag2S and Ag by a silane coupling agent-modified solvothermal method

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Facile Synthesis of n-type (AgIn)_xZn_2(1–x)S₂/p-type Ag₂S Nanocomposite for Visible Light Photocatalytic Reduction To Detoxify Hexavalent Chromium

Facile Synthesis of n-type (AgIn)_xZn_2(1–x)S₂/p-type Ag₂S Nanocomposite for Visible Light Photocatalytic Reduction To Detoxify Hexavalent Chromium