Photocatalytic activity of TiO2, ZnO and Nb2O5 applied to degradation of textile wastewater

Souza, Renata Padilha de; Freitas, Thabata Karoliny Formicoli Souza; Domingues, Fernando Santos; Pezoti, Osvaldo; Ambrosio, Elizângela; Ferrari, Ana Maria; Garcia, Jocilaine

doi:10.1016/j.jphotochem.2016.06.013

Cited by 90 publications

(22 citation statements)

References 42 publications

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“…Furthermore, in some cases, ZnO displays dramatically impressive photo-catalytic activities compared with broadly studied TiO 2 [88,91,[151][152][153][154][155][156][157][158][159][160]. In addition, element doping including both metal and nonmetal (C, N, S) doping could lead to an enhanced photo-catalytic activity; interestingly, most non-metal dopings were reported in photo-catalytic water splitting [161][162][163][164][165][166][167][168].…”

Section: Applications To Photo-catalysismentioning

confidence: 99%

The Applications of Morphology Controlled ZnO in Catalysis

et al. 2016

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Zinc oxide (ZnO), with the unique chemical and physical properties of high chemical stability, broad radiation absorption range, high electrochemical coupling coefficient, and high photo-stability, is an attractive multifunctional material which has promoted great interest in many fields. What is more, its properties can be tuned by controllable synthesized morphologies. Therefore, after the success of the abundant morphology controllable synthesis, both the morphology-dependent ZnO properties and their related applications have been extensively investigated. This review concentrates on the properties of morphology-dependent ZnO and their applications in catalysis, mainly involved reactions on green energy and environmental issues, such as CO 2 hydrogenation to fuels, methanol steam reforming to generate H 2 , bio-diesel production, pollutant photo-degradation, etc. The impressive catalytic properties of ZnO are associated with morphology tuned specific microstructures, defects or abilities of electron transportation, etc. The main morphology-dependent promotion mechanisms are discussed and summarized.

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Section: Applications To Photo-catalysismentioning

confidence: 99%

The Applications of Morphology Controlled ZnO in Catalysis

et al. 2016

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“…Furthermore, the effects of adsorption on both applied catalysts have also been assessed under different pH conditions because HPO is a surface phenomenon. It was previously reported that perfect decolorization and a considerable decrease in chemical oxygen demand (COD) in the dye solution could be achieved using both TiO 2 and ZnO catalysts and optimizing the operating conditions [22]. It was also observed that the toxicity of the treated solution increased during photodegradation after pre-adsorption of dye on both catalysts.…”

Section: Introductionmentioning

confidence: 99%

Eco-Toxicological and Kinetic Evaluation of TiO2 and ZnO Nanophotocatalysts in Degradation of Organic Dye

et al. 2019

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In this study, the photocatalytic degradation of azo dye “Food Black 1” (FB1) was investigated using TiO2 and ZnO nanoparticles under ultraviolet (UV) light. The performances of the two photocatalysts were evaluated in terms of key parameters (e.g., decolorization, dearomatization, mineralization, and detoxification of dye) in relation to variables including pre-adsorption period, pH, and temperature. Under acidic conditions (pH 5), the ZnO catalyst underwent photocorrosion to increase the concentration of zinc ions in the system, thereby increasing the toxic properties of the treated effluent. In contrast, TiO2 efficiently catalyzed the degradation of the dye at pH 5 following the Langmuir–Hinshelwood (L–H) kinetic model. The overall results of this study indicate that the decolorization rate of TiO2 on the target dye was far superior to ZnO (i.e., by 1.5 times) at optimum catalyst loading under UV light.

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“…Textile industry activity requires huge amounts of water, dyes, and chemicals, generating wastewater, solid waste, air emissions, and odors that directly impact the environment (Souza et al, ). In addition, synthetic dyes are responsible for wastewater with intense color and toxicity, acting as a source of pollution and interfering with the natural photosynthetic process.…”

Section: Introductionmentioning

confidence: 99%

Combined photocatalytic and biological process for textile wastewater treatments

Silva

Gonçalves

Araújo

2019

Water Environment Research

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Azo dyes, common in textile wastewater, have high photolytic and chemical stabilities, which make them difficult to be removed using conventional treatments. This study aims to evaluate a combined process using heterogeneous photocatalysis, with ZnO/UV or TiO 2 /UV (0.6 g catalyst L −1 solution/2-hr UV radiation), and a biological process for textile wastewater treatment. After the proposed treatments, the color and organic matter removals from synthetic wastewater (SW) and industrial wastewater (IW) were evaluated. For SW, the coupled photocatalytic (ZnO/UV or TiO 2 /UV)-biological system promoted a high extent of color removal (98%) and total organic carbon (TOC) reduction (>80%). Promising results were obtained with IW using combined photocatalytic (TiO 2 /UV)-biological treatments, reaching 97% and 63% of color and TOC removal, respectively. This process, coupling heterogeneous photocatalysis and a bioprocess, has proved to be a good alternative for the treatment of textile wastewater, not only for color removal but also for dye mineralization purposes. • Practitioner points• A combined process using heterogeneous photocatalysis (ZnO/UV or TiO 2 /UV) and biological process was evaluated for synthetic (SW) and industrial (IW) textile wastewaters treatment. • For SW, coupled process promoted high extent of colour and organic matter removals. • For IW, promising results were obtained with TiO 2 /UV-biological treatment (97% of colour and 63% of organic matter removals).

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Photocatalytic activity of TiO2, ZnO and Nb2O5 applied to degradation of textile wastewater

Cited by 90 publications

References 42 publications

The Applications of Morphology Controlled ZnO in Catalysis

The Applications of Morphology Controlled ZnO in Catalysis

Eco-Toxicological and Kinetic Evaluation of TiO2 and ZnO Nanophotocatalysts in Degradation of Organic Dye

Combined photocatalytic and biological process for textile wastewater treatments

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