Composition, morphology, structure and photocatalytic performances of photocatalysts prepared from titanium potassium oxalate

E, Lei; Hu, Chaoyang; Hu, Kangkai; Zhao, Wei; Cui, Jing; Xiong, Qiumin; Guo, Zhengang; Liu, Zhifeng

doi:10.1016/j.solidstatesciences.2018.12.002

Cited by 11 publications

(4 citation statements)

References 28 publications

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“…The type of transformation determines the value of the exponent n, where values of 2 and 1/2 correspond to direct and indirect bandgap transformations, respectively [ 38 ]. Rutile and anatase/rutile mixed crystal were judged as having direct gap conversion, whereas pure anatase showed indirect band gap conversion [ 39 , 40 , 41 ]. A tangent line intersects the x -axis along the climbing part of the curve in Figure 5 b.…”

Section: Resultsmentioning

confidence: 99%

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Controllable Phase Transformation and Enhanced Photocatalytic Performance of Nano-TiO2 by Using Oxalic Acid

et al. 2022

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Degradation of organic pollutants, especially organic dyes and antibiotics, by semiconductor photocatalysts is an efficient strategy for wastewater treatment. TiO2 nanomaterials are considered to be promising photocatalysts due to their high chemical stability, high efficiency and availability. Anatase TiO2 generally has superior photocatalytic activity to the rutile phase. However, the anatase phase can be irreversibly transformed to rutile phase when calcined at an elevated temperature. Methods to improve the stability of anatase are especially important for the TiO2 gas sensors working at high temperatures. The addition of strong acids can effectively suppress this transformation process. However, these strong acids are relatively expensive, corrosive and environmentally unfriendly. Herein, oxalic acid (OA) as a natural acid was used to control the hydrolysis process of tetrabutyl titanate (TBOT), leading to controllable crystalline phase transformation and reduced crystalline size of TiO2 on the nanoscale. What is more, the photocatalytic degradation performances were enhanced continuously when the molar ratio of OA to TBOT increased. The degradation reaction rate constants of CT650-R25 were about 10 times that of CT650-R0. The mechanism study shows that the enhanced photocatalytic activity can be attributed to the improved dispersibility, increased specific surface area and reduced recombination rates of photo-induced charge carriers and decreased energy bands as the concentration of OA increased. Thus, this work provides a simple, mild and effective method for controlling the crystalline forms of nano-TiO2 with enhanced photocatalytic performance towards waste water treatment.

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Section: Resultsmentioning

confidence: 99%

“…The results show that the increased [OA] resulted in superior photocatalytic performance. This can be attributed to the reduction in the recombination process of the photo-induced charge carriers [ 39 , 48 ]. For further industrial applications, the stability of CT650-R25 was studied by performing four cycles of experiments.…”

Section: Resultsmentioning

confidence: 99%

Controllable Phase Transformation and Enhanced Photocatalytic Performance of Nano-TiO2 by Using Oxalic Acid

et al. 2022

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“…The structural similarity means that an incoherent interphase boundary can be formed between the structures of Ti 2 O 3 (H 2 O) 2 (C 2 O 4 )⋅H 2 O and TiO 2 . Recently, our research shows that Ti 2 O 3 (H 2 O) 2 (C 2 O 4 )⋅H 2 O has high photocatalytic activity under UV‐light irradiation . Theoretically, the heterojunction prepared by TiO 2 and Ti 2 O 3 (H 2 O) 2 (C 2 O 4 )⋅H 2 O may be a promising photocatalyst or photoelectrode.…”

Section: Figurementioning

confidence: 97%

Direct Z‐Scheme Janus‐Shaped Heterojunction of TiO₂‐Ti₂O₃(H₂O)₂(C₂O₄)⋅H₂O: A Novel Photocatalyst or Photoanode

Zhao

et al. 2020

ChemistrySelect

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“…Cu 2 S/WO 3 showed a dense morphology containing particles with various shape and sizes combined in a relatively compact assembly. The Cu 2 S development was done on small and uniformly distributed SnO 2 , allowing the formation of a closely connected network with large cavities that can be used as photoactive sites during the acetaldehyde decomposition [44,45]. The metal oxides had a higher Brunauer-Emmett-Teller (BET) surface area (36.8 m 2 /g for WO 3 and 44.2 m 2 /g for SnO 2 ) compared with the copper sulfide (21.4 m 2 /g) component.…”

Section: Composition and Morphologymentioning

confidence: 99%

Photocatalytic Activity of Cu2S/WO3 and Cu2S/SnO2 Heterostructures for Indoor Air Treatment

Eneşca

Isac

2021

Materials

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Volatile organic compounds (VOCs) are commonly found in indoor spaces (e.g., homes or offices) and are often related to various illnesses, some of them with carcinogenic potential. The origins of VOC release in the indoor environment are in office products, building materials, electronics, cleaning products, furniture, and maintenance products. VOC removal can be done based on two types of technologies: adsorption in specific materials and decomposition via oxidative processes. The present article reports the development and photocatalytic activity of two heterostructures (Cu2S/WO3 and Cu2S/SnO2) used for indoor air decontamination. The acetaldehyde removal rate is discussed in correlation with the S-scheme mechanisms established between the heterostructure components but also comparatively with the bare catalysts’ activity. Acetaldehyde was considered as a VOC reference because it was found by the International Agency for Research on Cancer to be one of the most frequent air toxins with potential carcinogenic effects. The samples contained monoclinic WO3, tetragonal SnO2, and orthorhombic Cu2S crystalline structures. The Cu2S crystallite size in the heterostructure varied from 75.9 to 82.4 Å, depending on the metal oxide substrate. The highest photocatalytic efficiency (75.7%) corresponded to Cu2S/SnO2, with a constant rate of 0.106 s−1 (which was three times faster than WO3 or SnO2 and seven and a half times faster than Cu2S).

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Composition, morphology, structure and photocatalytic performances of photocatalysts prepared from titanium potassium oxalate

Cited by 11 publications

References 28 publications

Controllable Phase Transformation and Enhanced Photocatalytic Performance of Nano-TiO2 by Using Oxalic Acid

Controllable Phase Transformation and Enhanced Photocatalytic Performance of Nano-TiO2 by Using Oxalic Acid

Direct Z‐Scheme Janus‐Shaped Heterojunction of TiO₂‐Ti₂O₃(H₂O)₂(C₂O₄)⋅H₂O: A Novel Photocatalyst or Photoanode

Photocatalytic Activity of Cu2S/WO3 and Cu2S/SnO2 Heterostructures for Indoor Air Treatment

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Composition, morphology, structure and photocatalytic performances of photocatalysts prepared from titanium potassium oxalate

Cited by 11 publications

References 28 publications

Controllable Phase Transformation and Enhanced Photocatalytic Performance of Nano-TiO2 by Using Oxalic Acid

Controllable Phase Transformation and Enhanced Photocatalytic Performance of Nano-TiO2 by Using Oxalic Acid

Direct Z‐Scheme Janus‐Shaped Heterojunction of TiO2‐Ti2O3(H2O)2(C2O4)⋅H2O: A Novel Photocatalyst or Photoanode

Photocatalytic Activity of Cu2S/WO3 and Cu2S/SnO2 Heterostructures for Indoor Air Treatment

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Direct Z‐Scheme Janus‐Shaped Heterojunction of TiO₂‐Ti₂O₃(H₂O)₂(C₂O₄)⋅H₂O: A Novel Photocatalyst or Photoanode