A promising Zn-Ti layered double hydroxide/Fe-bearing montmorillonite composite as an efficient photocatalyst for Cr(VI) reduction: Insight into the role of Fe impurity in montmorillonite

Chuaicham, Chitiphon; Xiong, Yihuang; Karthikeyan, S.; Chen, Weinan; Zhang, Li; Ohtani, Bunsho; Dabo, Ismaïla; Sasaki, Keiko

doi:10.1016/j.apsusc.2020.148835

Cited by 36 publications

(23 citation statements)

References 68 publications

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“…Additionally, the TiO 2 phase in the xFe-Mt/(1 − x)Fe-TiO 2 has an Eg of 3.19 eV, with the 1.95 eV energy level of VB and -1.24 eV energy level of CB. The VBT of both the Fe/Mt/TiO 2 and the xFe-Mt/(1 − x)Fe-TiO 2 are lower than the reduction potential of •OH − production [25]. So, the h + and OH − should have little influence on the photocatalytic degradation of phenol.…”

Section: Photocatalytic Mechanismsmentioning

confidence: 96%

“…In addition, the radical scavenger test for the Fe/Mt/TiO 2 also proved that the O 2 − should be the predominant radical during the photocatalytic reaction. The Fe(III) located on the interlayer and surface of the Mt in both composites may generate a new Fermi level [25] and establish heterojunctions with the bulk TiO 2 in the composites to reduce the charge recombination and enhance electron transfer.…”

Section: Photocatalytic Mechanismsmentioning

confidence: 99%

“…In the layered double hydroxide (LDH) (or other clay) containing Fe(III)/Fe(II), a non-negligible promoting effect has been achieved in photocatalytic reactions [22][23][24]. Using density functional theory (DFT) calculation, a middle-gap electron trap state has been generated in the case of iron doping, thus improving the photocatalytic efficiency of the ZnTi-LDH/clay samples [25]. However, these studies did not discuss whether the Fe(III) was in the form of cation, metal oxide, metal hydroxide, or other forms.…”

Section: Introductionmentioning

confidence: 99%

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Fabrication of Adsorbed Fe(III) and Structurally Doped Fe(III) in Montmorillonite/TiO2 Composite for Photocatalytic Degradation of Phenol

et al. 2021

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The Fe(III)-doped montmorillonite (Mt)/TiO2 composites were fabricated by adding Fe(III) during or after the aging of TiO2/Ti(OH)4 sol–gel in Mt, named as xFe-Mt/(1 − x)Fe-TiO2 and Fe/Mt/TiO2, respectively. In the xFe-Mt/(1 − x)Fe-TiO2, Fe(III) cations were expected to be located in the structure of TiO2, in the Mt, and in the interface between them, while Fe(III) ions are physically adsorbed on the surfaces of the composites in the Fe/Mt/TiO2. The narrower energy bandgap (Eg) lower photo-luminescence intensity were observed for the composites compared with TiO2. Better photocatalytic performance for phenol degradation was observed in the Fe/Mt/TiO2. The 94.6% phenol degradation was due to greater charge generation and migration capacity, which was confirmed by photocurrent measurements and electrochemical impedance spectroscopy (EIS). The results of the energy-resolved distribution of electron traps (ERDT) suggested that the Fe/Mt/TiO2 possessed a larger amorphous rutile phase content in direct contact with crystal anatase than that of the xFe-Mt/(1 − x)Fe-TiO2. This component is the fraction that is mainly responsible for the photocatalytic phenol degradation by the composites. As for the xFe-Mt/(1 − x)Fe-TiO2, the active rutile phase was followed by isolated amorphous phases which had larger (Eg) and which did not act as a photocatalyst. Thus, the physically adsorbed Fe(III) enhanced light adsorption and avoided charge recombination, resulting in improved photocatalytic performance. The mechanism of the photocatalytic reaction with the Fe(III)-doped Mt/TiO2 composite was proposed.

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Section: Photocatalytic Mechanismsmentioning

confidence: 96%

Section: Photocatalytic Mechanismsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fabrication of Adsorbed Fe(III) and Structurally Doped Fe(III) in Montmorillonite/TiO2 Composite for Photocatalytic Degradation of Phenol

et al. 2021

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“…However, the photocatalytic activity of Cu-HyS has never been reported and studied. Photocatalysis is a unique approach that is widely used and utilized in a variety of interdisciplinary study areas, including the degradation of a variety of inorganic/organic hazardous pollutants in wastewater, air purification, insecticides, and so on [15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the separation and transfer mechanism of the electron-hole pairs in the composite were further elucidated and proposed. Furthermore, Cu-HyS was applied for elucidating the photocatalytic reduction of hexavalent chromium (Cr(VI)), which is a toxic inorganic pollutant in wastewater [19,[24][25][26][27][28], under light irradiation. Remarkably, Cr(VI) was placed third among the most common harmful environmental contaminants found in wastewater from various industries such as leather tanning, pigment production, and medicine, among others.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Hydrotalcite-like Copper Hydroxyl Salts as a Photocatalyst and Adsorbent for Hexavalent Chromium Removal

et al. 2022

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Cu-HyS-urea and Cu-HyS-NaOH, which are hydrotalcite-like copper hydroxyl salts, were prepared by two different methods, urea hydrolysis and precipitation, respectively. Both synthesis methods provided the successful formation of a copper hydroxyl salt, Cu2(OH)3NO3. From XRD and UV-DRS results, the product from the urea hydrolysis methods (Cu-HyS-urea) displayed higher crystallinity, small bandgap energy (Eg), and high light absorption ability because of some intercalated carbonate anions. For the Cr(VI) removal test, the Cu-HyS-NaOH showed superior adsorption of Cr(VI) than Cu-HyS-urea due to a higher specific surface area, confirmed by BET analysis. However, the Cu-HyS-urea presented higher photocatalytic Cr(VI) reduction under light irradiation than Cu-HyS-NaOH, owing to narrow Eg, less recombination, and a high transfer of the photogenerated charge carriers, proven by the results from photoluminescence, photocurrent density, and electrochemical impedance spectroscopy. Thus, this work provides a new function of the hydrotalcite-like copper hydroxyl salts (Cu-HyS-urea and Cu-HyS-NaOH) that can be utilized not only for adsorption of Cr(VI) but also as photocatalysts for Cr(VI) reduction under light irradiation.

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Solar-light-driven photocatalytic conversion of monosaccharide by oxygen-doped graphitic carbon nitride/artificial steel converter slag composite

Srikhaow

Chuaicham

Shenoy

et al. 2023

Chemical Engineering Journal

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A promising Zn-Ti layered double hydroxide/Fe-bearing montmorillonite composite as an efficient photocatalyst for Cr(VI) reduction: Insight into the role of Fe impurity in montmorillonite

Cited by 36 publications

References 68 publications

Fabrication of Adsorbed Fe(III) and Structurally Doped Fe(III) in Montmorillonite/TiO2 Composite for Photocatalytic Degradation of Phenol

Fabrication of Adsorbed Fe(III) and Structurally Doped Fe(III) in Montmorillonite/TiO2 Composite for Photocatalytic Degradation of Phenol

Fabrication of Hydrotalcite-like Copper Hydroxyl Salts as a Photocatalyst and Adsorbent for Hexavalent Chromium Removal

Solar-light-driven photocatalytic conversion of monosaccharide by oxygen-doped graphitic carbon nitride/artificial steel converter slag composite

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