Facile modification of TiO2 nanoparticles with H2O2 + NH4F for enhanced visible light photodegradation of rhodamine B and methylene blue

Yu, Zhehan; Zhang, Lihua; Watanabe, Seiichi

doi:10.1016/j.mtcomm.2022.104213

Cited by 6 publications

(3 citation statements)

References 59 publications

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“…The presence of H 2 O 2 slowed down the rate of the reaction and decreased the DE for both catalysts at 42% and 33%, respectively. These results are in line with those previously obtained by us for nitrogen-doped zirconia thin film on Si(100) substrate [5] but in contradiction with the literature data on other photocatalysts [38,39]. A possible explanation was given above in the XPS data analysis.…”

Section: Photocatalytic Activitysupporting

confidence: 85%

Photocatalytic Activity of N-Doped ZrO2 Thin Films Determined by Direct and Indirect Irradiation

Mita,

Cornei,

Frenti

et al. 2023

Materials

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In this paper, we investigate the decomposition of a toxic organic compound, Rhodamine B, by the photocatalytic activities of undoped and nitrogen-doped ZrO2 thin films, deposited using the HiPIMS technique. The investigation was performed in the presence and in the absence of H2O2, for two types of experimental arrangements: the irradiation of the films, followed by dipping them in the Rhodamine B solutions, and the irradiation of the films dipped in the solution. The two situations were named “direct irradiation” and “indirect irradiation”, respectively. Methods like XRD, AFM, XPS, DRS, water/film surface contact angle, and spectrophotometry were used to obtain information on the films’ structure, surface morphology, elemental composition of the films surface, optical band gap, hydrophilicity, and photocatalytic activity, respectively. All these properties were described and correlated. By N-doping ZrO2, the films become absorbent in the visible domain, so that the solar light could be efficiently used; the films’ hydrophilic properties improve, which is an important fact in self-cleaning applications; and the films’ photocatalytic activity for the decomposition of Rhodamine B becomes better. The addition of hydrogen peroxide acted as an inhibitor for all systems and not as an accelerator of the photocatalytic reactions as expected.

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Section: Photocatalytic Activitysupporting

confidence: 85%

Photocatalytic Activity of N-Doped ZrO2 Thin Films Determined by Direct and Indirect Irradiation

Mita,

Cornei,

Frenti

et al. 2023

Materials

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“…Moreover, activating photocatalysts with H 2 O 2 can offer advantages such as prolonging the lifespan of the formed charge carriers and facilitating the generation of hydroxyl radicals. These radicals are highly active potential oxidizing agents, playing an important role in the degradation of contaminants [ 39 , 41 , 42 ]. In addition, H 2 O 2 can be considered an economically viable and relatively environmentally safe compound [ 39 ].…”

Section: Introductionmentioning

confidence: 99%

Advanced Photodegradation of Azo Dye Methyl Orange Using H2O2-Activated Fe3O4@SiO2@ZnO Composite under UV Treatment

Makota,

Dutková,

Briančin

et al. 2024

Molecules

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The Fe3O4@SiO2@ZnO composite was synthesized via the simultaneous deposition of SiO2 and ZnO onto pre-prepared Fe3O4 nanoparticles. Physicochemical methods (TEM, EDXS, XRD, SEM, FTIR, PL, zeta potential measurements, and low-temperature nitrogen adsorption/desorption) revealed that the simultaneous deposition onto magnetite surfaces, up to 18 nm in size, results in the formation of an amorphous shell composed of a mixture of zinc and silicon oxides. This composite underwent modification to form Fe3O4@SiO2@ZnO*, achieved by activation with H2O2. The modified composite retained its structural integrity, but its surface groups underwent significant changes, exhibiting pronounced catalytic activity in the photodegradation of methyl orange under UV irradiation. It was capable of degrading 96% of this azo dye in 240 min, compared to the initial Fe3O4@SiO2@ZnO composite, which could remove only 11% under identical conditions. Fe3O4@SiO2@ZnO* demonstrated robust stability after three cycles of use in dye photodegradation. Furthermore, Fe3O4@SiO2@ZnO* exhibited decreased PL intensity, indicating an enhanced efficiency in electron-hole pair separation and a reduced recombination rate in the modified composite. The activation process diminishes the electron-hole (e−)/(h+) recombination and generates the potent oxidizing species, hydroxyl radicals (OH˙), on the photocatalyst surface, thereby playing a crucial role in the enhanced photodegradation efficiency of methyl orange with Fe3O4@SiO2@ZnO*.

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“…While individual metal oxides possess good catalytic degradation abilities under specific conditions, their applications are limited under other conditions [27]. To overcome this limitation, modification approaches have been explored [28], and heterojunctions have emerged as an effective strategy to expand the application range of specific metal oxides [29]. The submerged photosynthesis of crystallites (SPSC) method, first proposed by Jeem et al [30], offers a novel route for the fabrication of metal oxide materials using UV light in aqueous solution (e.g., water, H2O2 solution).…”

Section: Introductionmentioning

confidence: 99%

Submerged Photosynthesis of TiO2-CuO Hetero-nanoparticles for the Solar Photo-electrolysis of Multiple Environmental Hazardous Substances

Zhu

Zhang

et al. 2023

Preprint

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Environmental challenges have become a matter of great concern, requiring immediate attention. Agricultural pollution, such as ammonia discharge, and industrial pollution, including the abuse of organic dyes, present significant dilemmas for humanity. In response to these challenges, we propose an approach by synthesizing TiO2-CuO hetero-nanoparticles capable of degrading multiple hazardous environmental substances. Submerged photosynthesis of crystallites (SPSC) can synthesize or assist in the synthesis of metal oxides due to its simplicity and environmentally friendly nature. TiO2-CuO hetero-nanoparticles with varying Cu-Ti molar ratios were prepared, characterized, and evaluated for performance. The dispersion of CuO within TiO2 was found to be relatively uniform. Increasing the amount of added Cu resulted in an increase in CuO content until reaching the upper limit. Despite minor variations, all hetero-nanoparticle samples exhibited excellent solar light absorption performance. The simultaneous utilization of solar light illumination and electrochemical techniques synergistically enhanced the degradation process of these hazardous substances. The hetero-nanoparticle with a Cu-Ti molar ratio of 0.17 demonstrated the optimal photo-electrochemical degradation performance, exhibiting a 150% increase in degradation efficiency under solar light illumination compared to dark condition. Furthermore, it exhibited superior efficiency in the electrochemical degradation of RhB under solar light, degrading 32% more than solar light alone, and 2% more than electrochemistry alone. The mechanisms behind the fabrication and degradation processes were also discussed, elucidating the underlying principles driving the observed performance. In conclusion, our research highlights the potential of TiO2-CuO hetero-nanoparticles for solar light-assisted degradation of NH3 and RhB, showcasing their environmental applications.

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Facile modification of TiO2 nanoparticles with H2O2 + NH4F for enhanced visible light photodegradation of rhodamine B and methylene blue

Cited by 6 publications

References 59 publications

Photocatalytic Activity of N-Doped ZrO2 Thin Films Determined by Direct and Indirect Irradiation

Photocatalytic Activity of N-Doped ZrO2 Thin Films Determined by Direct and Indirect Irradiation

Advanced Photodegradation of Azo Dye Methyl Orange Using H2O2-Activated Fe3O4@SiO2@ZnO Composite under UV Treatment

Submerged Photosynthesis of TiO2-CuO Hetero-nanoparticles for the Solar Photo-electrolysis of Multiple Environmental Hazardous Substances

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