Comprehensive Kinetics of the Photocatalytic Degradation of Emerging Pollutants in a LED-Assisted Photoreactor. S-Metolachlor as Case Study

Rancaño, Laura; Rivero, Marı́a J.; Mueses, Miguel Ángel; Ortiz, Inmaculada

doi:10.3390/catal11010048

Cited by 7 publications

(3 citation statements)

References 42 publications

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“…This review focuses on the overall strategies that improve photocatalysis selectivity and encompasses a wide variety of photocatalysts and their modifications, as well as the vital related processes of industrial significance, such as the reduction and oxidation of organics and inorganics and transformation of CO 2 . After optimizing various procedures, the ultimate challenge of this field involves the use of natural sunlight to remediate real wastewater [281][282][283][284].…”

Section: Applicationsmentioning

confidence: 99%

Preparation and Photocatalytic Activities of TiO2-Based Composite Catalysts

Yang

Chen

et al. 2022

Catalysts

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While modern industry has contributed to the prosperity of an increasingly urbanized society, it has also led to serious pollution problems, with discharged wastewater and exhaust gases causing significant environmental harm. Titanium dioxide (TiO2), which is an excellent photocatalyst, has received extensive attention because it is inexpensive and able to photocatalytically degrade pollutants in an environmentally friendly manner. TiO2 has many advantages, including high chemical stability, low toxicity, low operating costs, and environmental friendliness. TiO2 is an N-order semiconductor material with a bandgap of 3.2 eV. Only when the wavelength of ultraviolet light is less than or equal to 387.5 nm can the valence band electrons obtain the energy of the photons and pass through the conduction band and form photoelectrons, while the valence band, correspondingly, forms photogenerated holes, and light in other areas will not be generated. The most common methods used to improve the photocatalytic efficiency of TiO2 involve increasing its photoresponse range and reducing photogenerated-carrier coupling. The morphology, size, and structure of a heterojunction can be altered through element doping, leading to improved photocatalytic efficiency. Mainstream methods for preparing TiO2 are reviewed in this paper, with several excellent preparation schemes for improving the photocatalytic efficiency of TiO2 introduced. TiO2 is mainly prepared using sol-gel, solvothermal, hydrothermal, anodic oxidation, microwave-assisted, CVD and PVD methods, and TiO2 nanoparticles with excellent photocatalytic properties can also be prepared. Ti-containing materials are widely used to purify harmful gases, as well as contaminants from building materials, coatings, and daily necessities. Therefore, the preparation and applications of titanium materials have become globally popular research topics.

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Section: Applicationsmentioning

confidence: 99%

Preparation and Photocatalytic Activities of TiO2-Based Composite Catalysts

Yang

Chen

et al. 2022

Catalysts

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“…The rutile phase was found to not exist as an overlayer on the surface of the anatase particle, but it exists separately from the anatase particles [30]. The application of P25 as a photocatalyst for the photocatalytic degradation of alachlor [28,30] and metolachlor [36,39] has previously been reported. On the other hand, AV-01 is anatase titanium dioxide, used especially in paints, but also applicable for the pigmentation of rubber mixtures or direct injection into paper pulp.…”

Section: Discussionmentioning

confidence: 93%

“…The degradation of alachlor in aqueous solutions using different heterogeneous photocatalytic systems is relatively well-described in the literature [28][29][30][31][32][33][34][35]. On the other hand, less attention is paid to metolachlor and acetochlor, and their photocatalytic degradation has rarely been investigated [36][37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Removal of Chloroacetanilide Herbicides from Water Using Heterogeneous Photocatalysis with TiO2/UV-A

et al. 2022

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Chloroacetanilide herbicides are widely used in the agricultural sector throughout the world. Because of their poor biodegradability, high water solubility, and long persistence, chloroacetanilide herbicides have a high potential to contaminate water, and conventional water treatment processes do not ensure sufficient removal. Therefore, heterogeneous photocatalysis using TiO2/UV-A was investigated for the degradation of alachlor, acetochlor, and metolachlor from water. Two commercially available TiO2 (P25 and AV-01) were used as photocatalysts. Different experimental setups were also tested. In addition, the toxicity of single herbicides and mixtures of their photocatalytic degradation products to the freshwater alga Chlorella kessleri was investigated via a growth inhibition test. The maximum removal efficiency for alachlor, acetochlor, and metolachlor was 97.5%, 93.1%, and 98.2%, respectively. No significant differences in the removal efficiency of chloroacetanilide herbicides were observed for the photocatalysts used. Although the concentrations of all herbicides during photocatalysis decreased, the toxicity of the resulting mixtures of degradation products increased or remained the same, indicating the formation of toxic degradation products.

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