The application of modified nano-TiO
            <sub>2</sub>
            photocatalyst for wastewater treatment: A review

Mohadesi, Majid; Fard, Mahdi Sanavi; Shokri, Aref

doi:10.1080/03067319.2022.2064751

Cited by 30 publications

(5 citation statements)

References 82 publications

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“…These photoexcited species, denoted as electrons (e CB – ) and holes (h VB + ), play critical roles as initiators of photoredox reactions to degrade organic pollutants (i.e., dyes, phenolic, and any volatile organic compounds) in the air and wastewater media. Exchanging energy between irradiated photons and chemical bonds in order to purify wastewater is an attractive field according to cost-effectiveness, convenient accessibility, and easy employment of photocatalysts. , …”

Section: Mechanism Of Photocatalytic Degradation Of Water-soluble And...mentioning

confidence: 99%

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A Review of Synthesis Methods, Modifications, and Mechanisms of ZnO/TiO₂-Based Photocatalysts for Photodegradation of Contaminants

Ghamarpoor,

Fallah,

Jamshidi

2024

ACS Omega

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The environment being surrounded by accumulated durable waste organic compounds has become a critical crisis for human societies. Generally, organic effluents of industrial plants released into the water source and air are removed by some physical and chemical processes. Utilizing photocatalysts as cost-effective, accessible, thermally/ mechanically stable, nontoxic, reusable, and powerful UV-absorber compounds creates a new gateway toward the removal of dissolved, suspended, and gaseous pollutants even in trace amounts. TiO 2 and ZnO are two prevalent photocatalysts in the field of removing contaminants from wastewater and air. Structural modification of the photocatalysts with metals, nonmetals, metal ions, and other semiconductors reduces the band gap energy and agglomeration and increases the affinity toward organic compounds in the composite structures to expand their usability on an industrial scale. This increases the extent of light absorbance and improves the photocatalytic efficiency. Selecting a suitable synthesis method is necessary to prepare a target photocatalyst with distinct properties such as high specific surface area, numerous surface functional groups, and an appropriate crystalline phase. In this Review, significant parameters for the synthesis and modification of TiO 2 -and ZnO-based photocatalysts are discussed in detail. Several proposed mechanistic routes according to photocatalytic composite structures are provided. Some electrochemical analyses using charge carrier trapping agents and delayed recombination help to plot mechanistic routes according to the direction of photoexcited species (electron−hole pairs) and design more effective photocatalytic processes in terms of cost-effective photocatalysts, saving time and increasing productivity.

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Section: Mechanism Of Photocatalytic Degradation Of Water-soluble And...mentioning

confidence: 99%

“…Exchanging energy between irradiated photons and chemical bonds in order to purify wastewater is an attractive field according to cost-effectiveness, convenient accessibility, and easy employment of photocatalysts. 255,256 5.3. Photogenerated Species Pathway.…”

Section: Photogenerated Speciesmentioning

confidence: 99%

A Review of Synthesis Methods, Modifications, and Mechanisms of ZnO/TiO₂-Based Photocatalysts for Photodegradation of Contaminants

Ghamarpoor,

Fallah,

Jamshidi

2024

ACS Omega

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“…where X is the absolute electronegativity of ZnO (5.94 eV) and TiO2 (5.81 e V) [51,5 the energy of free electrons on the hydrogen scale (ca.…”

Section: Possible Mechanism Of the Photocatalytic Activity Of The Zno...mentioning

confidence: 99%

“…Among AOPs, heterogeneous photocatalysis using semiconductor oxides has proven to be a very effective solution for removing pollutants [1,2]. Both zinc oxide (ZnO) and titanium dioxide (TiO 2 ) are n-type semiconductors widely used as photocatalysts for the removal of several water pollutants [3][4][5][6][7]. However, the practical applications of these two semiconductors are limited by their large band gap (3.37 eV for ZnO [8] and 3.2 eV for TiO 2 [9]), which makes them able to absorb only UV light, and by the rapid recombination of photogenerated holes and electrons [10,11].…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Degradation of Ceftriaxone Using TiO2 Coupled with ZnO Micronized by Supercritical Antisolvent Route

Mancuso,

Mottola,

Sacco

et al. 2023

Nanomaterials

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Heterogeneous photocatalysis is a promising technique for removing pollutants from water. In this work, supercritical antisolvent (SAS)-micronized ZnO (ZnOSAS) is coupled with commercial anatase TiO2 (PC50) to study the photocatalytic degradation of ceftriaxone under UV and visible light. Diffuse ultraviolet–visible reflectance (UV−vis DRS) measurement revealed that the presence of ZnO leads to a slight absorption in the visible region. Wide-angle X-ray diffraction (WAXD) analysis showed the presence of both ZnO wurtzite and TiO2 anatase crystalline phases in the composite. Photocatalytic tests proved that the activity of the ZnOSAS/PC50 composite is higher than that of commercial ZnO, SAS-micronized ZnO, and PC50, allowing complete ceftriaxone degradation under UV light after only 2 min of irradiation time. In contrast, about 90% of ceftriaxone degradation is achieved after 180 min of visible-light irradiation. The photocatalytic results for an experiment carried out in the presence of probe scavenger molecules for reactive oxygen species show that hydroxyl radicals and positive holes are both reactive species involved in the ceftriaxone photocatalytic degradation mechanism. Finally, reuse cycles of the ZnOsas/PC50 composite are performed, demonstrating the stability and recyclability of the photocatalyst.

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“…In particular, hydroxyl radicals and other radicals originating from them are of great interest due to their high antimicrobial nature, which also finds utilization in degrading organic materials. These two applications combined can make TiO 2 a promising catalyst for water remediation. − …”

Section: Introductionmentioning

confidence: 99%

Fibrous TiO₂ Alternatives for Semiconductor-Based Catalysts for Photocatalytic Water Remediation Involving Organic Contaminants

et al. 2023

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Water decontamination remains a challenge in several developed and developing countries. Affordable and efficient approaches are needed urgently. In this scenario, heterogeneous photocatalysts appear as one of the most promising alternatives. This justifies the extensive attention that semiconductors, such as TiO 2 , have gained over the last decades. Several studies have evaluated their efficiency for environmental applications; however, most of these tests rely on the use of powder materials that have minimal to no applicability for large-scale applications. In this work, we investigated three fibrous TiO 2 photocatalysts, TiO 2 nanofibers (TNF), TiO 2 on glass wool (TGW), and TiO 2 in glass fiber filters (TGF). All materials have macroscopic structures that can be easily separated from solutions or that can work as fixed beds under flow conditions. We evaluated and compared their ability to bleach a surrogate dye molecule, crocin, under batch and flow conditions. Using black light (UVA/visible), our catalysts were able to bleach a minimum of 80% of the dye in batch experiments. Under continuous flow experiments, all catalysts could decrease dye absorption under shorter irradiation times: TGF, TNF, and TGW could, respectively, bleach 15, 18, and 43% of the dye with irradiation times as short as 35 s. Catalyst comparison was based on the selection of physical and chemical criteria relevant for application on water remediation. Their relative performance was ranked and applied in a radar plot. The features evaluated here had two distinct groups, chemical performance, which related to the dye degradation, and mechanical properties, which described their applicability in different systems. This comparative analysis gives insights into the selection of the right flow-compatible photocatalyst for water remediation.

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The application of modified nano-TiO ₂ photocatalyst for wastewater treatment: A review

Cited by 30 publications

References 82 publications

A Review of Synthesis Methods, Modifications, and Mechanisms of ZnO/TiO₂-Based Photocatalysts for Photodegradation of Contaminants

A Review of Synthesis Methods, Modifications, and Mechanisms of ZnO/TiO₂-Based Photocatalysts for Photodegradation of Contaminants

Photocatalytic Degradation of Ceftriaxone Using TiO2 Coupled with ZnO Micronized by Supercritical Antisolvent Route

Fibrous TiO₂ Alternatives for Semiconductor-Based Catalysts for Photocatalytic Water Remediation Involving Organic Contaminants

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The application of modified nano-TiO 2 photocatalyst for wastewater treatment: A review

Cited by 30 publications

References 82 publications

A Review of Synthesis Methods, Modifications, and Mechanisms of ZnO/TiO2-Based Photocatalysts for Photodegradation of Contaminants

A Review of Synthesis Methods, Modifications, and Mechanisms of ZnO/TiO2-Based Photocatalysts for Photodegradation of Contaminants

Photocatalytic Degradation of Ceftriaxone Using TiO2 Coupled with ZnO Micronized by Supercritical Antisolvent Route

Fibrous TiO2 Alternatives for Semiconductor-Based Catalysts for Photocatalytic Water Remediation Involving Organic Contaminants

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Product

Resources

About

The application of modified nano-TiO ₂ photocatalyst for wastewater treatment: A review

A Review of Synthesis Methods, Modifications, and Mechanisms of ZnO/TiO₂-Based Photocatalysts for Photodegradation of Contaminants

A Review of Synthesis Methods, Modifications, and Mechanisms of ZnO/TiO₂-Based Photocatalysts for Photodegradation of Contaminants

Fibrous TiO₂ Alternatives for Semiconductor-Based Catalysts for Photocatalytic Water Remediation Involving Organic Contaminants