Visible-light photocatalytic reduction of Cr(Ⅵ) using nano-sized delafossite (CuFeO2) synthesized by hydrothermal method

Xu, Qiupeng; Li, Ruizhen; Wang, Chengduan; Yuan, Dong

doi:10.1016/j.jallcom.2017.06.243

Cited by 62 publications

(40 citation statements)

References 41 publications

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“…Because of the presence of formic acid, the hydroxyl radical (•OH), which is produced from the holes and OH − , is able to be captured by formic acid. This will produce reactive •CO2 − , which has a relatively negative redox potential, E 0 (•CO2 − /CO2) = −1.9 V vs. NHE [24,25], compared with the redox potential for Cr(VI), E 0 (HCrO4 − /Cr 3+ ) = 1.35 V vs. NHE [26]. TiO2 + hν → TiO2 (eCB − + hVB + )…”

Section: Reaction Mechanismmentioning

confidence: 99%

Photocatalytic Reduction of Hexavalent Chromium with Nanosized TiO2 in Presence of Formic Acid

et al. 2019

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Nanosized titanium dioxide (TiO2) nanoparticles were used for the photocatalytic reduction of hexavalent chromium in the presence of formic acid. The photoreduction of Cr(VI) in the absence of formic acid was quite slow. When formic acid was added in the chromium solution as the hole scavenger, a rapid photocatalytic reduction of Cr(VI) was observed, owing to the consumption of hole and the acceleration of the oxidation reaction. Furthermore, three commercial TiO2 nanoparticles (AEROXIDE® P25; Ishihara Sangyo ST-01; FUJIFILM Wako Pure Chemical Corp.) were evaluated for the photoactivity of reduction of Cr(VI).

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Section: Reaction Mechanismmentioning

confidence: 99%

Photocatalytic Reduction of Hexavalent Chromium with Nanosized TiO2 in Presence of Formic Acid

et al. 2019

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“…Some photogenerated electrons (e − ) and holes (H + ) migrate to the surface of the catalyst to participate in redox reactions. In this case, the separated electrons could react with Cr 2 O 7 2− to generate Cr(III), while the holes could oxidize water to form O 2 . The possible reactions involved can be described as follows:

true Bi_{2} normalS_{3} + hv \to Bi_{2} normalS_{3} (e_{cb}^{-} + h_{vb}^{+})

true Cr_{2} normalO_{7}^{2 -} + 14 H^{+} + 6 e^{-} \to 2 Cr^{3 +} + 7 H_{2} normalO

true 2 H_{2} normalO + 4 normalh^{+} \to normalO_{2} + 4 H^{+}

…”

Section: Resultsmentioning

confidence: 99%

Hydrothermal Synthesis of Urchin‐like Bi₂S₃ Nanostructures for Superior Visible‐light‐driven Cr(VI) Removal Capacity

et al. 2018

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In this work, large amounts of urchin‐like Bi2S3 nanostructures assembled from radially oriented nanorods were prepared by a simple hydrothermal method. The as‐prepared Bi2S3 nanostructures possess an orthorhombic crystal structure with a high crystallinity. More importantly, the obtained Bi2S3 nanostructures are spherical architectures composed of large quantities of nanorods with highly active sites. This attractive architecture can provide a large active surface area for photocatalysis. The photodegradation of Cr(VI) under visible light irradiation indicated that 95% of Cr(VI) was degradated within 30 min using the as‐prepared Bi2S3 nanoparticle as a photocatalyst. Further investigations revealed that the pH value of the solution has a significant effect on the photocatalytic reduction ability as well. Significantly, the kinetic constant of urchin‐like Bi2S3 nanostructures for Cr(VI) degradation is about 100 times that of Bi2S3 nanoflowers and commercial P25. Furthermore, the photocurrent of urchin‐like Bi2S3 nanostructures is still higher than that of Bi2S3 nanoflowers. We believed that the urchin‐like Bi2S3 nanostructures are promising materials for Cr(VI) photoreduction.

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“…These methods include the application of Cr(VI) reduction via the use of chemical reductants as well as photocatalytic routes. Both the methodologies have advantages and disadvantages in the reduction process . Moreover, our reported bimetallic CuPd alloy NPs showed intriguing catalytic activity in both reduction reactions e. g. reduction of 4‐NP and toxic Cr(VI) compared to the monometallic counterparts .…”

Section: Cu−m (M=pd Ag Pt Au) Nanoparticle Catalystsmentioning

confidence: 90%

Cu‐Based Nanoparticles as Emerging Environmental Catalysts

Deka

Borah

Saikia

et al. 2018

The Chemical Record

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This account provides an overview of current research activities on nanoparticles containing the earth-abundant and inexpensive element copper (Cu) and Cu-based nanoparticles, especially in the field of environmental catalysis. The different synthetic strategies with possible modification of the chemical/ physical properties of these nanoparticles using such strategies and/or conditions to improve catalytic activity are presented. The design and development of support and/or bimetallic systems (e. g., alloys, intermetallic, etc.) are also included. Herein, we report synthetic approaches of Cu and Cu-based nanoparticles (monometallic copper, bimetallic copper and copper (II) oxide nanoparticles/nanostructures) and impregnation of such nanoparticles onto support material (e. g., Co O nanostructure), along with their applications as environmental catalyst for various oxidation and reduction reactions. Finally, this account provides necessary advances and perspectives of Cu-based nanoparticles in the environmental catalysis.

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Visible-light photocatalytic reduction of Cr(Ⅵ) using nano-sized delafossite (CuFeO2) synthesized by hydrothermal method

Cited by 62 publications

References 41 publications

Photocatalytic Reduction of Hexavalent Chromium with Nanosized TiO2 in Presence of Formic Acid

Photocatalytic Reduction of Hexavalent Chromium with Nanosized TiO2 in Presence of Formic Acid

Hydrothermal Synthesis of Urchin‐like Bi₂S₃ Nanostructures for Superior Visible‐light‐driven Cr(VI) Removal Capacity

Cu‐Based Nanoparticles as Emerging Environmental Catalysts

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Visible-light photocatalytic reduction of Cr(Ⅵ) using nano-sized delafossite (CuFeO2) synthesized by hydrothermal method

Cited by 62 publications

References 41 publications

Photocatalytic Reduction of Hexavalent Chromium with Nanosized TiO2 in Presence of Formic Acid

Photocatalytic Reduction of Hexavalent Chromium with Nanosized TiO2 in Presence of Formic Acid

Hydrothermal Synthesis of Urchin‐like Bi2S3 Nanostructures for Superior Visible‐light‐driven Cr(VI) Removal Capacity

Cu‐Based Nanoparticles as Emerging Environmental Catalysts

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Hydrothermal Synthesis of Urchin‐like Bi₂S₃ Nanostructures for Superior Visible‐light‐driven Cr(VI) Removal Capacity