Research progress of TiO<sub>2</sub> photocatalytic reduction of oxyanion pollutants in water: a mini review

Su, Kai; Li, Linxiao; Deng, Shaoqi; Gao, Zihan; Qin, Qirui; Yang, Jingyu; Zhang, Shengli; Chen, Junmin

doi:10.1080/17518253.2021.2018050

Cited by 11 publications

(3 citation statements)

References 56 publications

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“…Late cork cells have a reduced prism height, nearly 10 µm, and the cell wall thickness almost doubles. The number of cells per cm 3 fluctuates from 4 to 7 × 10 7 for early cork and late cork from 10 to 20 × 10 7 [90]. Another important characteristic is the non-uniform undulations of the cell walls, which vary from cell to cell, as well as the roughness of their surface [93].…”

Section: Scanning Electron Microscopymentioning

confidence: 99%

“…The rapid development of industrialization and population growth have strongly contributed to the shortage of available clean water, thus increasing the demand for reliable and accessible solutions that enable water purification [1]. The uncontrolled discharge of toxic contaminants into the environment, which include organic pollutants, heavy metals, inorganic compounds, and other complex compounds, has significantly contributed to water contamination [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

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Floating TiO2-Cork Nano-Photocatalysts for Water Purification Using Sunlight

et al. 2022

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In the present study, titanium dioxide (TiO2) nano-photocatalysts were synthesized through microwave irradiation. In a typical microwave synthesis, TiO2 nanomaterials were simultaneously produced in powder form and also directly covering cork substrates. The TiO2 nanopowder was analyzed by X-ray diffraction (XRD), Raman spectroscopy and transmission electron microscopy (TEM), revealing that the solvothermal microwave synthesis resulted only in the TiO2 anatase phase. From Fourier-transform infrared spectroscopy (FTIR), cork’s organic species, along with bands of TiO2, were detected. UV–VIS absorption spectrum revealed an absorption extension to the visible region, since a brown powdered TiO2 product was obtained. Very fine nanoparticles were observed displaying a nearly spherical shape that agglomerates in larger particles. These larger particles fully covered the surface of the honeycomb cork cells, originating TiO2 functionalized cork platforms. The TiO2 functionalized substrates were further tested as floating photocatalysts and their photocatalytic activity was assessed from rhodamine B degradation under solar simulating light and natural sunlight. Reusability tests were also performed under natural sunlight. The strategy applied in this research work allowed the production of green and low-cost cork platforms based on TiO2 photoactive materials with the ability to purify polluted water under natural sunlight.

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Section: Scanning Electron Microscopymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Floating TiO2-Cork Nano-Photocatalysts for Water Purification Using Sunlight

et al. 2022

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“…As a green technology, photocatalysis has attracted extensive attention because it can effectively eliminate toxic organic substances, bacteria, and pollutants in water [1]. Oxide semiconductor photocatalysts, such as TiO 2 , ZnO, Fe 2 O 3 , WO 3 , and SnO 2 , can produce electron-hole pairs by absorbing appropriate photon energy [20][21][22][23][24]. The holes and electrons participate in the oxidation process to remove organic contaminants.…”

Section: Introductionmentioning

confidence: 99%

Tio₂ coating on alumina membranes for continuous separation of dyes

2023

Surface Engineering

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Ceramic membranes characterised by corrosion resistance, high-temperature applicability, and reusability are especially suitable for wastewater treatment. In this research, Titania dioxide (TiO 2 ) was fabricated on surfaces of alumina (Al 2 O 3 ) membranes by hydrothermal reaction and factors that influenced their morphologies were investigated. SEM images showed needle-like TiO 2 crystals filling up the pores on the membrane surfaces. We investigated the photocatalytic activity and continuous separation performance of the TiO 2 coating alumina membranes using Congo red dye as a model organic pollutant. The results showed that the dye removal ratio remained at about 98% in a 120 h continuous filtration test. Furthermore, we proposed an easy and low-cost membrane regeneration method based on the photocatalytic degradation of TiO 2 crystals. The regenerated membrane still showed excellent continuous filtration ability, indicating the good potential application in the treatment of dye effluents.

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Efficiency enhancement and chrono-photoelectron generation in dye-sensitized solar cells based on spin-coated TiO2 nanoparticle multilayer photoanodes and a ternary iodide gel polymer electrolyte

Bandara,

Gunathilake,

Nishshanke

et al. 2023

J Mater Sci: Mater Electron

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The effect of the thickness of a multilayer TiO2 photoanode on the performance of a dye-sensitized solar cell (DSC) made with a polyethylene oxide-based gel polymer electrolyte containing ternary iodides and performance enhancer 4-tert-butylpyridine is studied. Multilayer photoanodes consisting of up to seven layers of TiO2 nano-particles (13 nm and 21 nm) are prepared by spin coating of successive layers. XRD results confirm the predominant presence of the anatase phase of TiO2 in the multilayer structure after sintering. The SEM images reveal the formation of a single TiO2 film upon sintering due to merging of individually deposited layers. The photocurrent density (JSC) and the efficiency increase with the number of TiO2 layers exhibiting the maximum efficiency and JSC of 5.5% and 12.5 mA cm−2, respectively, for the 5-layered electrode of total thickness 4.0 µm with a 9.66 × 10–8 mol cm−2 surface dye concentration. The present study introduces a method of determining the rate of effective photoelectron generation and the average time gap between two successive photon absorptions where the respective results are 1.34 molecule−1 s−1 and 0.74 s for the most efficient cell studied in this work.

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Research progress of TiO₂ photocatalytic reduction of oxyanion pollutants in water: a mini review

Cited by 11 publications

References 56 publications

Floating TiO2-Cork Nano-Photocatalysts for Water Purification Using Sunlight

Floating TiO2-Cork Nano-Photocatalysts for Water Purification Using Sunlight

Tio₂ coating on alumina membranes for continuous separation of dyes

Efficiency enhancement and chrono-photoelectron generation in dye-sensitized solar cells based on spin-coated TiO2 nanoparticle multilayer photoanodes and a ternary iodide gel polymer electrolyte

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Research progress of TiO2 photocatalytic reduction of oxyanion pollutants in water: a mini review

Cited by 11 publications

References 56 publications

Floating TiO2-Cork Nano-Photocatalysts for Water Purification Using Sunlight

Floating TiO2-Cork Nano-Photocatalysts for Water Purification Using Sunlight

Tio2 coating on alumina membranes for continuous separation of dyes

Efficiency enhancement and chrono-photoelectron generation in dye-sensitized solar cells based on spin-coated TiO2 nanoparticle multilayer photoanodes and a ternary iodide gel polymer electrolyte

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Product

Resources

About

Research progress of TiO₂ photocatalytic reduction of oxyanion pollutants in water: a mini review

Tio₂ coating on alumina membranes for continuous separation of dyes