Application of visible light on copper-doped titanium dioxide catalyzing degradation of chlorophenols

Lin, Justin Chun Te; Sopajaree, Khajornsak; Jitjanesuwan, Thidarat; Lu, Ming‐Chun

doi:10.1016/j.seppur.2017.09.027

Cited by 55 publications

(17 citation statements)

References 62 publications

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“…However, by increasing the concentration of the photocatalyst to a value of 1000 mg L − ¹ of ZnO-Ag (1.3%), the extent of decolorization was inferior to that of the maximum: 60% OII removal. This phenomenon was observed by other authors for different photocatalysts [27,28] and is probably due to the effects of the NP aggregation and the reduction of the available surface area for photon absorption. A similar trend, but with slower reaction kinetics, was observed in samples containing ZnO NPs.…”

Section: Influence Of Photocatalyst Concentration On Oii Removalsupporting

confidence: 69%

Enhanced Photocatalytic Activity of Semiconductor Nanocomposites Doped with Ag Nanoclusters Under UV and Visible Light

et al. 2019

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Emerging contaminants (ECs) represent a wide range of compounds, whose complete elimination from wastewaters by conventional methods is not always guaranteed, posing human and environmental risks. Advanced oxidation processes (AOPs), based on the generation of highly oxidizing species, lead to the degradation of these ECs. In this context, TiO2 and ZnO are the most widely used inorganic photocatalysts, mainly due to their low cost and wide availability. The addition of small amounts of nanoclusters may imply enhanced light absorption and an attenuation effect on the recombination rate of electron/hole pairs, resulting in improved photocatalytic activity. In this work, we propose the use of silver nanoclusters deposited on ZnO nanoparticles (ZnO–Ag), with a view to evaluating their catalytic activity under both ultraviolet A (UVA) and visible light, in order to reduce energetic requirements in prospective applications on a larger scale. The catalysts were produced and then characterized by scanning electron microscopy (SEM), X-ray diffractometry (XRD) and inductively coupled plasma-optical emission spectrometry (ICP-OES). As proof of concept of the capacity of photocatalysts doped with nanoclusters, experiments were carried out to remove the azo dye Orange II (OII). The results demonstrated the high photocatalytic efficiency achieved thanks to the incorporation of nanoclusters, especially evident in the experiments performed under white light.

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Section: Influence Of Photocatalyst Concentration On Oii Removalsupporting

confidence: 69%

Enhanced Photocatalytic Activity of Semiconductor Nanocomposites Doped with Ag Nanoclusters Under UV and Visible Light

et al. 2019

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“…The semiconductor photocatalyst, TiO 2 with external dimension in nanosize, has a wide range of applications in the field of cosmetic materials (Syngouna et al 2017) and decontamination or mineralization of compounds in water to harmless inorganic anions (Szczepanik et al 2017). Thus, TiO 2 nanoparticles (T-NPs) have received much attention among researchers due to their extensive characteristics (Nasirian and Mehrvar 2016;Dariania et al 2016;Lin et al 2018). It is popularly known that TiO 2 powders in anatase phase have powerful catalytic activities due to their large surface area, surface chemistry, and redox properties.…”

Section: Introductionmentioning

confidence: 99%

Application of TiO2 and ZnO nanoparticles immobilized on clay in wastewater treatment: a review

et al. 2020

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Increase in industrial and anthropogenic activities leads to a decline in water quality. This necessitates the need for the removal of contaminants from industrial and domestic wastewater. Clay minerals are naturally abundant and non-toxic materials that found to be useful for remediation of emerging contaminants from wastewater. This review paper presents an insight into clay, the simplest material (in solgel techniques) for the synthesis of TiO 2 and ZnO, mechanisms of their reactions, analytical techniques used for characterizations, and their nanocomposites for wastewater treatment. Nanomaterials, such as nanoclay, titanium, and zinc oxide, have offered the opportunities of sequestering variety of pollutants in wastewater. TiO 2 and ZnO anchored on clay have been found to be good promising sequesters and have been explored for wastewater remediation via nanotechnology. This water treatment method includes adsorption/absorption, photocatalysis, and microbial disinfection. These nanocomposites provide more active surface sites and reduce the agglomeration of the nanoparticles, but leaching has been their shortcomings. To overcome this, the filtration technique may become significant for the removal and avoidance of fouling of wastewater. This can be achieved through the fabrication of nano-based filters using the nanocomposites.

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“…The synergetic effect observed between Nb2O5 and ecbscavenger H2O2 can be explained by the enhanced generation of • OH from Reaction (2) due to the significant reduction of the recombination rate of Reaction (3) [26,36]. This effect results in a consequent increase in the availability of reactive oxygen species on the Nb2O5 photocatalyst surface, and then the increased oxidation capabilities of the system degrading the azo dye molecule [17,23].…”

Section: Photocatalytic Activity On Azo Dye Decolorizationmentioning

confidence: 99%

“…This effect results in a consequent increase in the availability of reactive oxygen species on the Nb2O5 photocatalyst surface, and then the increased oxidation capabilities of the system degrading the azo dye molecule [17,23]. The synergetic effect observed between Nb 2 O 5 and e cb − scavenger H 2 O 2 can be explained by the enhanced generation of OH from Reaction (2) due to the significant reduction of the recombination rate of Reaction (3) [26,36]. This effect results in a consequent increase in the availability of reactive oxygen species on the Nb 2 O 5 photocatalyst surface, and then the increased oxidation capabilities of the system degrading the azo dye molecule [17,23].…”

Section: Photocatalytic Activity On Azo Dye Decolorizationmentioning

confidence: 99%

“…These improved performances can be explained due to the increasing number of active sites resulting from the higher total specific surface of Nb 2 O 5 available, thereby accelerating the photocatalytic generation of oxidants in solution by Reactions (1) and (2). The effective reduction of photocatalytic efficiency at excessively high catalyst dosages is commonly reported in the literature, and is attributed to the detrimental effects on light transport in solution caused by: (i) the increase of the solution opacity, which diminishes the radiation penetration and consequently the photogeneration of vacancies [9,40]; (ii) the aggregation of suspended catalyst particles diminishing the specific area [27,36]; and (iii) light scattering effects that also reduce the UV light penetration [22,42]. In addition, the surface available for adsorption processes is also increased, favoring the mechanisms of organic degradation.…”

Section: Evaluation Of Optimal Dosage Of Nb 2 O 5 To Ensure Maximum Pmentioning

confidence: 99%

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Niobium Oxide Catalysts as Emerging Material for Textile Wastewater Reuse: Photocatalytic Decolorization of Azo Dyes

et al. 2019

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Niobium-based metal oxides are emerging semiconductor materials with barely explored properties for photocatalytic wastewater remediation. Brazil possesses the greatest reserves of niobium worldwide, being a natural resource that is barely exploited. Environmental applications of solar active niobium photocatalysts can provide opportunities in the developing areas of Northeast Brazil, which receives over 22 MJ m2 of natural sunlight irradiation annually. The application of photocatalytic treatment could incentivize water reuse practices in small and mid-sized textile businesses in the region. This work reports the facile synthesis of Nb2O5 catalysts and explores their performance for the treatment of colored azo dye effluents. The high photoactivity of this alternative photocatalyst makes it possible to quickly obtain complete decolorization, in less than 40 min of treatment. The optimal operational conditions are defined as 1.0 g L−1 Nb2O5 loading in slurry, 0.2 M of H2O2, pH 5.0 to treat up to 15 mg L−1 of methyl orange solution. To evaluate reutilization without photocatalytic activity loss, the Nb2O5 was recovered after the experience and reused, showing the same decolorization rate after several cycles. Therefore, Nb2O5 appears to be a promising photocatalytic material with potential applicability in wastewater treatment due to its innocuous character and high stability.

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Application of visible light on copper-doped titanium dioxide catalyzing degradation of chlorophenols

Cited by 55 publications

References 62 publications

Enhanced Photocatalytic Activity of Semiconductor Nanocomposites Doped with Ag Nanoclusters Under UV and Visible Light

Enhanced Photocatalytic Activity of Semiconductor Nanocomposites Doped with Ag Nanoclusters Under UV and Visible Light

Application of TiO2 and ZnO nanoparticles immobilized on clay in wastewater treatment: a review

Niobium Oxide Catalysts as Emerging Material for Textile Wastewater Reuse: Photocatalytic Decolorization of Azo Dyes

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