scholarly journals Modified TiO2 for photocatalytic removal of organic pollutants in water

2021 ◽  
Vol 899 (1) ◽  
pp. 012068
Author(s):  
S Mergenbayeva ◽  
A Ashir ◽  
B Yergali ◽  
G Ulykbanova ◽  
S Poulopoulos
Keyword(s):  
Uv Light ◽  
Treatment Method ◽  
Treatment Temperature ◽  
Composite Catalysts ◽  
Uv Light Irradiation ◽  
Three Phase ◽  
Photocatalytic Removal ◽  
Size Growth ◽  
One Step ◽  
Effect Of Treatment

Abstract In this work, TiO2/Ti2O3 composite catalysts were prepared by simple one-step thermal treatment method at various temperatures. The morphology and structure of as-prepared samples have been examined by XRD, TGA and SEM. The XRD characterization results revealed three-phase mixture in sample treated at 550°C, while at 650°C phase transformation from TiO2 anatase to TiO2 rutile and particle size growth was observed. Moreover, the effect of treatment temperature on the photocatalytic degradation of caffeine was evaluated under UV light irradiation. Results indicated that TiO2/Ti2O3-550 exhibited higher catalytic activity than others achieving complete caffeine removal in 60 min.

PHOTOCATALYTIC REMOVAL OF PHENOL OVER MESOPOROUS ZnO/TiO2 COMPOSITES

2018 ◽  
Vol 80 (2) ◽  
Author(s):  
Klinsmann Cheong Lee Khang ◽  
Mohd Hayrie Mohd Hatta ◽  
Siew Ling Lee ◽  
Leny Yuliati
Keyword(s):  
Pore Size ◽  
Uv Light ◽  
Average Pore Size ◽  
Anatase Tio2 ◽  
Light Irradiation ◽  
Molar Ratio ◽  
Average Pore ◽  
Uv Light Irradiation ◽  
Photocatalytic Removal ◽  
Mesoporous Zno

A series of mesoporous ZnO/TiO2 composites were successfully synthesized using cetyltrimethylammonium bromide surfactant. The composites of different Zn:Ti molar ratios (0.5:1, 0.75:1, and 1:1) were prepared by impregnating ZnO onto mesoporous TiO2. XRD results verified co-existence of both anatase TiO2 and hexagonal wurtzite ZnO in the ZnO/TiO2 composites. Based on the Tauc plots, all the composites showed almost the same band gap energy of approximately 3.21 eV. The fourier transform infrared spectroscopy results successful covering of ZnO on the surface of the TiO2 as the hydrophilicity property of TiO2 decreased remarkably with the loading of ZnO in the composites. N2 adsorption-desorption isotherms of the samples exhibited type-IV isotherm with a hysteresis loop. The Barrett-Joyner-Halenda pore size distribution revealed that the average pore size of the composites was around 3.6 nm, indicating the formation of mesopores dominantly in the samples. The photocatalytic removal of phenol over the samples under UV light irradiation after 3 h decreased in the order: ZnO/TiO2 composites > anatase TiO2 (with surfactant) > anatase TiO2 (without surfactant) > ZnO. The composite with Zn:Ti molar ratio of 0.75:1 has achieved the highest photocatalytic activity of 36.5% in the removal of phenol under UV light irradiation for 3 h.

scholarly journals Preparation of highly active zinc oxide for photocatalytic removal of phenol: Direct calcination versus co-precipitation method

2015 ◽  
Vol 11 (3) ◽  
Author(s):  
Faisal Hussin ◽  
Hendrik O. Lintang ◽  
Lee Siew Ling ◽  
Leny Yuliati
Keyword(s):  
Zinc Oxide ◽  
Uv Light ◽  
Light Irradiation ◽  
Precipitation Method ◽  
Highly Active ◽  
Uv Light Irradiation ◽  
Photocatalytic Removal ◽  
Volmer Plot ◽  
Xrd Patterns ◽  
Co Precipitation

Photocatalytic removal of phenol under UV light irradiation was studied on zinc oxide (ZnO) photocatalysts, which were prepared via direct calcination (DC), and co-precipitation (CP) methods. The XRD patterns revealed that all of the prepared ZnO samples showed wurtzite structure, in which the ZnO-CP showed higher intensity of the diffraction peaks than the ZnO-DC sample. Optical and fluorescence properties of the prepared ZnO samples were similar to each other as confirmed by DR UV-Vis and fluorescence spectroscopy, respectively. The Stern-Volmer plot was investigated to study the interactions between the emission sites and the phenol. It was obtained that the emission sites of the ZnO-CP gave better interactions towards phenol molecules as compared to the ZnO-DC. After 6 hours reaction under UV light irradiation, the ZnO-CP sample showed two times higher photocatalytic activity for removal of phenol (10%) than that of the ZnO-DC (5%). It was suggested that the high activity observed on the ZnO-CP sample would be due to high crystallinity and good interactions with phenol. These results clearly suggested that the co-precipitation method was a good approach to prepare the highly active ZnO for the photocatalytic removal of phenol.

Preparation of TiO2/ZnO composite catalysts and their photocatalytic activity for degradation of pentachlorophenol

2017 ◽  
Vol 14 (4) ◽  
pp. 279-283 ◽  
Author(s):  
Juan Xie ◽  
Yongjing Hao ◽  
Meixia Li ◽  
Yiwei Lian ◽  
Li Bian
Keyword(s):  
Photocatalytic Activity ◽  
Uv Light ◽  
Organic Pollutant ◽  
Ultra Violet ◽  
X Ray Diffraction ◽  
Content Type ◽  
Composite Catalysts ◽  
Uv Light Irradiation ◽  
Excellent Photocatalytic Activity ◽  
Good Catalytic Activity

Purpose This paper aims to report a novel preparation method of titanium dioxide (TiO2)/zinc oxide (ZnO) composites with different mole ratios of TiO2:ZnO and their photocatalytic activity. Design/methodology/approach TiO2/ZnO composites are prepared by a facile route. X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM) and ultra-violet–visible diffuse reflectance spectra (UV-vis DRS) are used to characterize the products. Photocatalytic activity of the samples is evaluated by degradation of persistent organic pollutant pentachlorophenol under ultra-violet (UV) irradiation. Findings It is found that all the as-prepared TiO2/ZnO composites not only have good catalytic activity under UV light irradiation, but also have excellent circulation stability. The optimal mole ratio of TiO2:ZnO is 0.75:1. Originality/value This report presents a simple and rapid method for the preparation of TiO2/ZnO composites with excellent photocatalytic activity. Experimental results could provide useful reference for the treatment of chlorophenols in the future.

scholarly journals Novel TiO2/GO/CuFe2O4 nanocomposite: a magnetic, reusable and visible-light-driven photocatalyst for efficient photocatalytic removal of chlorinated pesticides from wastewater

RSC Advances ◽  
2020 ◽  
Vol 10 (57) ◽  
pp. 34806-34814 ◽  
Author(s):  
A. M. Ismael ◽  
A. N. El-Shazly ◽  
S. E. Gaber ◽  
M. M. Rashad ◽  
A. H. Kamel ◽  
...  
Keyword(s):  
Visible Light ◽  
Photocatalytic Degradation ◽  
Ball Milling ◽  
Uv Light ◽  
Low Cost ◽  
Light Irradiation ◽  
Chlorinated Pesticides ◽  
Uv Light Irradiation ◽  
Photocatalytic Removal ◽  
Visible Light Driven

A TiO2/GO/CuFe2O4 heterostructure photocatalyst is fabricated by a simple and low cost ball milling pathway for enhancing the photocatalytic degradation of chlorinated pesticides under UV light irradiation.

scholarly journals Electrospun Poly(methyl methacrylate)/TiO2 Composites for Photocatalytic Water Treatment

Polymers ◽  
2021 ◽  
Vol 13 (22) ◽  
pp. 3923
Author(s):  
Olya Stoilova ◽  
Nevena Manolova ◽  
Iliya Rashkov
Keyword(s):  
Water Treatment ◽  
Methyl Methacrylate ◽  
Uv Light ◽  
Organic Pollutant ◽  
Photocatalytic Efficiency ◽  
Flow Rates ◽  
Poly Methyl Methacrylate ◽  
Uv Light Irradiation ◽  
One Step ◽  
The One

Electrospinning was successfully used for the one-step fabrication of poly(methyl methacrylate) (PMMA) fibers loaded with an inorganic photocatalyst—titanium oxide (TiO2). By tuning the PMMA/TiO2 ratio and the electrospinning conditions (applied voltage, needle tip-to-collector distance, and flow rates), PMMA/TiO2 composites with selected organic/inorganic ratios, tailored designs, and targeted properties were obtained. The morphology of the electrospun composites was affected by the amount of TiO2 incorporated into the PMMA fibers. In addition, the inorganic photocatalyst had an impact on the wettability, thermal stability, and optical properties of the electrospun composites. In particular, the surface wettability of the composites was strongly influenced by UV light irradiation and from hydrophobic became superhydrophilic. Moreover, PMMA/TiO2 composites had enhanced tensile strength in comparison with those of bare PMMA mats. The electrospun PMMA/TiO2 composites showed excellent photocatalytic efficiency against the model organic pollutant—methylene blue—which is very promising for the future development of membranes that are highly efficacious for photocatalytic water treatment.

Synthesis, crystal structure, luminescence, and photocatalytic properties of a 2D Cu(II) metal-organic frameworks based on 3,5-di(1H-benzimidazol-1-yl)pyridine and 4,4′-oxybis(benzoate) ligands

2020 ◽  
Vol 75 (8) ◽  
pp. 727-732
Author(s):  
Chen Zhang ◽  
Jian-Qing Tao
Keyword(s):  
Crystal Structure ◽  
Thermal Analysis ◽  
Uv Light ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
X Ray Diffraction ◽  
X Ray ◽  
Uv Light Irradiation ◽  
Photocatalytic Activities ◽  
Metal Organic

AbstractA new Cu(II) metal-organic framework, [Cu(L)(OBA)·H2O]n (1) [H2OBA = 4,4′-oxybis(benzoic acid), L = 3,5-di(1H-benzimidazol-1-yl)pyridine] was hydrothermally synthesized and characterized through IR spectroscopy, elemental and thermal analysis and single-crystal X-ray diffraction. Complex 1 is a four-connected uni-nodal 2D net with a (44·62) topology which shows an emission centered at λ ∼393 nm upon excitation at λ = 245 nm. Moreover, complex 1 possesses high photocatalytic activities for the decomposition of Rhodamine B (RhB) under UV light irradiation.

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