Dye-modification effects on water splitting activity of GaN:ZnO photocatalyst

Hagiwara, Hidehisa; Nagatomo, Masakiyo; Seto, Chihiro; Ida, Shintaro; Ishihara, Tatsumi

doi:10.1016/j.jphotochem.2013.08.022

Cited by 27 publications

(17 citation statements)

References 42 publications

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“…These high concentrations of dyes in effluents interfere with the penetration of visible light into the water, resulting in a hindrance to photosynthesis and a decrease in gas solubility, since less than 1 mgL −1 of dye is highly visible. Furthermore, synthetic dyes, which include an aromatic ring in their basic structure, are regarded as toxic, carcinogenic, and xenobiotic compounds [ 43 – 46 ]. Also, this type of dyes may convey toxicity to aquatic life and may be mutagenic and carcinogenic and can cause intense damage to human beings, including the reproductive system and dysfunction of the kidneys, brain, liver, and central nervous system [ 34 ].…”

Section: Introductionmentioning

confidence: 99%

Recent Advances in Heterogeneous Photocatalytic Decolorization of Synthetic Dyes

Julkapli

Bagheri

Hamid

2014

The Scientific World Journal

287

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During the process and operation of the dyes, the wastes produced were commonly found to contain organic and inorganic impurities leading to risks in the ecosystem and biodiversity with the resultant impact on the environment. Improper effluent disposal in aqueous ecosystems leads to reduction of sunlight penetration which in turn diminishes photosynthetic activity, resulting in acute toxic effects on the aquatic flora/fauna and dissolved oxygen concentration. Recently, photodegradation of various synthetic dyes has been studied in terms of their absorbance and the reduction of oxygen content by changes in the concentration of the dye. The advantages that make photocatalytic techniques superior to traditional methods are the ability to remove contaminates in the range of ppb, no generation of polycyclic compounds, higher speed, and lower cost. Semiconductor metal oxides, typically TiO2, ZnO, SnO, NiO, Cu2O, Fe3O4, and also CdS have been utilized as photocatalyst for their nontoxic nature, high photosensitivity, wide band gap and high stability. Various process parameters like photocatalyst dose, pH and initial dye concentrations have been varied and highlighted. Research focused on surface modification of semiconductors and mixed oxide semiconductors by doping them with noble metals (Pt, Pd, Au, and Ag) and organic matter (C, N, Cl, and F) showed enhanced dye degradation compared to corresponding native semiconductors. This paper reviews recent advances in heterogeneous photocatalytic decolorization for the removal of synthetic dyes from water and wastewater. Thus, the main core highlighted in this paper is the critical selection of semiconductors for photocatalysis based on the chemical, physical, and selective nature of the poisoning dyes.

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Section: Introductionmentioning

confidence: 99%

Recent Advances in Heterogeneous Photocatalytic Decolorization of Synthetic Dyes

Julkapli

Bagheri

Hamid

2014

The Scientific World Journal

287

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“…In the past decade, various systems capable of Z-scheme water splitting (Figure 1b), such as Pt or Ru/SrTiO 3 :Rh-Fe 3+ /Fe 2+ -WO 3 , BiVO 4 , or Bi 2 MoO 6 [6,7], Pt/TaON-IO 3´/ I´-PtO X /WO 3 or RuO 2 /TaON [8,9], Pt/ZrO 2 /TaON-IO 3´/ I´-Ir/TiO 2 /Ta 3 N 5 or RuO 2 /TaON [10,11], and other systems [12][13][14][15], have been reported. Our research group has also reported Z-scheme water splitting using porphyrin-dye-modified inorganic semiconductors, such as KTa(Zr)O 3 [16][17][18], GaN:ZnO [19] and TaON [20]. In these dye-modified photocatalysts, the dyes used for modification improve the utilization efficiency of visible light and increase the charge separation lifetime owing to the electron transfer between the excited inorganic semiconductors and the dyes, as shown in Figure 1c.…”

Section: Introductionmentioning

confidence: 99%

Effect of Porphyrin Molecular Structure on Water Splitting Activity of a KTaO3 Photocatalyst

Hagiwara

Higashi

Watanabe³

et al. 2016

Catalysts

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Photocatalytic water splitting is one of the ideal methods for solving the global energy crisis and its associated environmental problems. In this study, the effect of altering the molecular structure of porphyrins was investigated to improve the water splitting activity of Zr-doped KTaO 3 (KTa(Zr)O 3 ) modified with porphyrin dyes. UV-vis spectra indicated that porphyrins with long alkoxy chains tended to form well-developed H-aggregates on the KTa(Zr)O 3 surface. The photocatalytic activity of Pt-loaded KTa(Zr)O 3 was improved by using porphyrins with longer alkoxy chains because of the improvement in the charge migration between porphyrin dye molecules. While the charge transfer between the inorganic semiconductor and porphyrin dye interface is important, it was found that the formation of H-aggregation was more effective in improving the water splitting activity of the porphyrin-modified photocatalysts.

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“…Moreover, the substitutions of four meso-or eight β-positions of porphyrin can finely tune the physicochemical and electrochemical properties, and thus easily constructs oriented electron transfer pathway in a dye-sensitized system [20][21][22][23]. In addition, certain porphyrin derivatives were used as electron acceptor to construct artificial photosynthetic photocatalysts [24][25][26][27][28]. For example, a ternary TCPP/rGO/ Bi2WO6 Z-scheme heterojunction exhibited visible-light-driven activity due to the effective charge separation by using Bi2WO6 and TCPP as the hole-rich and electron-rich reservoir [27], respectively.…”

Section: Introductionmentioning

confidence: 99%

Z-scheme photocatalyst based on porphyrin derivative decorated few-layer BiVO4 nanosheets for efficient visible-light-driven overall water splitting

Wang

Guo

et al. 2020

Nano Res.

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It is highly desirable to simulate natural photosynthesis by using sunlight to drive the overall water splitting without using external bias and sacrificial agent. Herein, few-layer monoclinic BiVO 4 nanosheets (BVNS) with a thickness of ~4.3 nm, exposed (010) facets and abundant oxygen vacancies are fabricated using graphene oxide dots as templating reagent. After decorating with asymmetric chromium porphyrin derivative bearing one benzoic acid and three phenyls as meso-position substituents (chromium-5-(4-carboxyphenyl)-10,15,20-triphenylporphrin, CrmTPP) and PtO x cocatalyst, the obtained two-dimensional (2D) hybrid nanocomposite (BVNS/CrmTPP/Pt) with an optimal component ratio delivers a robust overall water splitting performance with a relatively high apparent quantum yield (8.67%) at 400 nm monochromatic light. The ultrathin structure and widely distributed oxygen vacancies on the exposed (010) facets of BVNS not only endow strong and intimate contact with the decorated CrmTPP molecules to promote a two-step excitation Z-scheme charge transfer mechanism for preserving the high redox ability of the photogenerated charge carriers, but also alleviate their recombination, and thus causing the robust overall water splitting performance of the 2D hybrid nanocomposites. The present results provide a novel strategy to construct highly efficient artificial photosynthetic system for overall water splitting.

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Dye-modification effects on water splitting activity of GaN:ZnO photocatalyst

Cited by 27 publications

References 42 publications

Recent Advances in Heterogeneous Photocatalytic Decolorization of Synthetic Dyes

Recent Advances in Heterogeneous Photocatalytic Decolorization of Synthetic Dyes

Effect of Porphyrin Molecular Structure on Water Splitting Activity of a KTaO3 Photocatalyst

Z-scheme photocatalyst based on porphyrin derivative decorated few-layer BiVO4 nanosheets for efficient visible-light-driven overall water splitting

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