Synchronous role of coupled adsorption and photocatalytic oxidation on ordered mesoporous anatase TiO2–SiO2 nanocomposites generating excellent degradation activity of RhB dye

Dong, Weiyang; Lee, Chul Wee; Lu, Xinchun; Sun, Yaojun; Hua, Weiming; Zhuang, Guoshun; Zhang, Shicheng; Chen, Jianmin; Hou, Huiqi; Zhao, Dongyuan

doi:10.1016/j.apcatb.2009.12.025

Cited by 156 publications

(48 citation statements)

References 46 publications

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“…Over the past decade, many semiconductors have been extensively tested as effective photocatalysts including TiO 2 [4], ZnO [5], ZnWO 4 [6], SiO 2 [7], and CuO [8]. However, most of them are only active under UV irradiation, which limits their further applications.…”

Section: Introductionmentioning

confidence: 99%

Ag3PO4 quantum dots sensitized AgVO3 nanowires: A novel Ag3PO4/AgVO3 nanojunction with enhanced visible-light photocatalytic activity

Lin

Guo

Shi

et al. 2015

Catalysis Communications

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Section: Introductionmentioning

confidence: 99%

Ag3PO4 quantum dots sensitized AgVO3 nanowires: A novel Ag3PO4/AgVO3 nanojunction with enhanced visible-light photocatalytic activity

Lin

Guo

Shi

et al. 2015

Catalysis Communications

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“…8, inset) which is characteristic of pure PEDOT and confirms its amorphous nature 40 . That peak appears for samples with higher concentration of polymer in composite, PEDOT/ZnO (1-3) and (1)(2)(3)(4)(5). The XRD results show that the increase in the polymer ratio in composite significantly affects the surface of ZnO photocatalyst.…”

Section: Xrd Analysismentioning

confidence: 72%

“…Morphology of pure PEDOT polymers differ among themselves as it is observed that polymers form the aggregated particles. The size of primary particles seems to be larger for PEDOT (1)(2)(3)(4)(5) (Fig. 6c) than that of the other two samples PEDOT (1-2) (Fig.…”

Section: Sem Analysismentioning

confidence: 96%

“…Azo dyes are considered non-degradable, and common degradation processes such as physicochemical treatment, oxidative techniques and other are not able to completely remove dyes from the contaminated wastewaters 3 . Heterogeneous photocatalytic oxidation process is promising for removal of synthetic dyes during wastewater treatment [4][5][6] . Heterogeneous photocatalysis includes a large variety of reactions: mild or total oxidations, dehydrogenation, hydrogen transfer, metal deposition, water detoxification, gaseous pollutant removal, etc.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of PEDOT/ZnO Photocatalyst: Validation of Photocatalytic Activity by Degradation of Azo RR45 Dye Under Solar and UV-A Irradiation

Katančić

Šuka

Vrbat

et al. 2018

Chem.Biochem.Eng.Q.

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To study the photocatalytic efficiency of wastewater treatment processes, the nanocomposites of conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT) and ZnO nanoparticles were prepared by in-situ synthesis. ZnO is an excellent photocatalyst under UV light, but due to high band gap, photons of visible light have insufficient energy to excite electrons from valence to conductive band, which limits its activity under visible light and therefore practical usage is limited. The PEDOT conductive polymer was used to increase the photocatalytic activity of ZnO since conductive polymers are known as efficient electron donor and good electron transporters upon visible-light excitation. Polymerization of pure PEDOT and PEDOT/ZnO nanocomposites was carried out at varying monomer:oxidant ratio (1:2; 1:3; 1:5) with the ammonium persulfate (APS) used as the oxidant. Samples were characterized by FTIR spectroscopy, XRD analysis, SEM microscopy, UV-Vis spectroscopy and TG analysis. Photocatalytic activity was assessed through removal of C.I. Reactive Red 45 (RR45) azo dye under simulated Solar and UV-A irradiation. Photocatalysis was monitored by measuring discoloration of RR45 using UV/Vis spectroscopy. The results indicate that very low concentration of PEDOT conductive polymer in PEDOT/ZnO nanocomposite can significantly contribute to the efficiency of the photocatalytic process during wastewater treatment.

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“…Also, the highly crystalline mesoporous structure in R-TiO 2 /SiO 2 and WH-TiO 2 /SiO 2 catalysts, which also originated from the natural hierarchical structures of the plant templates, endowed them larger specific surface areas, and more adsorption and active sites, which are conducive to quickening mass transport and improving the efficiency of electron-hole separation [26]. Besides, the increasing band gaps in TiO 2 /SiO 2 samples as a result of the structure and introduction of Si could reduce electron-hole recombination, and help to capture more photoinduced holes during the photocatalytic process [26,27]. Therefore, in this work, the photocatalytic activity of R-TiO 2 /SiO 2 and WH-TiO 2 /SiO 2 samples was higher than that of P25 TiO 2 and TiO 2 -p. In the case of D-TiO 2 /SiO 2 samples, although it possesses high specific surface area and band gaps, the negligible Si content appears to dampen the effect on its photocatalytic activity.…”

Section: Samplesmentioning

confidence: 99%

Biotemplated Mesoporous TiO2/SiO2 Composite Derived from Aquatic Plant Leaves for Efficient Dye Degradation

Yan

Guo

et al. 2017

Catalysts

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Abstract:The biotemplating technique is an environmental-protective high-efficiency new technology by which the resulting TiO 2 may simultaneously attain the duplication of structure and self-doping elements from biotemplate materials, which is highly desirable for photocatalytic applications. In this paper, aquatic plant leaves-including reed, water hyacinth, and duckweed-were used as both templates and silicon precursors to successfully synthesize biomorphic TiO 2 /SiO 2 composite with mesoporous structures. X-ray diffraction, scanning electron microscopy, transmission electron microscopy, N 2 adsorption-desorption, and UV-visible diffuse reflectance spectra were applied to characterize the microstructures of the samples. The results show that all TiO 2 /SiO 2 composites are mainly composed of an anatase phase with mesoporous structure and possess high specific surface area. Compared with commercial Degussa P25 TiO 2 , all TiO 2 /SiO 2 samples display intensive light-harvesting efficiency, particularly in the visible light range. The activities were evaluated by using gentian violet as a target for photocatalytic degradation experiments under simulated solar irradiation. The TiO 2 /SiO 2 samples templated by reed and water hyacinth leaves exhibit high activity, while the TiO 2 /SiO 2 samples obtained from duckweed are inferior to P25 in the degradation of gentian violet. A synergistic effect of SiO 2 incorporation and structural construction through biotemplating is proposed to be beneficial to photocatalytic activity.

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Synchronous role of coupled adsorption and photocatalytic oxidation on ordered mesoporous anatase TiO2–SiO2 nanocomposites generating excellent degradation activity of RhB dye

Cited by 156 publications

References 46 publications

Ag3PO4 quantum dots sensitized AgVO3 nanowires: A novel Ag3PO4/AgVO3 nanojunction with enhanced visible-light photocatalytic activity

Ag3PO4 quantum dots sensitized AgVO3 nanowires: A novel Ag3PO4/AgVO3 nanojunction with enhanced visible-light photocatalytic activity

Synthesis of PEDOT/ZnO Photocatalyst: Validation of Photocatalytic Activity by Degradation of Azo RR45 Dye Under Solar and UV-A Irradiation

Biotemplated Mesoporous TiO2/SiO2 Composite Derived from Aquatic Plant Leaves for Efficient Dye Degradation

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