Photocatalytic activity under visible light irradiation of cement based materials containing TiO2-xNy nanoparticles

Self-cleaning activity of Portland cement pastes blended with nanoparticles of titanium oxynitride (TiO2−xNy) was studied. Samples with various amounts of TiO2−xNy (1% and 3%) were evaluated under irradiation of UV and visible light, and with two curing ages (65 hour and 28 days). Rhodamine B was the pigment used and its loss of color on the cement pastes was carried out using a Spectrometer UV/Vis measuring the coordinates CIE (Commission Internationale de l’Eclairage) L∗, a∗, b∗. Discoloration of Rhodamine B on the surface of the samples was established as the photocatalytic efficiency coefficient (ε). In addition, samples with TiO2 nanoparticles (1% and 3%) were studied under the same conditions and their performances were compared with TiO2-xNy. The presence of nitrogen in the tetragonal structure of TiO2 was evidenced by X-ray diffraction (XRD), ultraviolet-visible diffuse reflectance spectrophotometry and Carbon, Hydrogen and Nitrogen (CHN) analysis. The band gap for TiO2 and TiO2-xNy was determined by the transformed Kubelka-Munk function ( [F (R∞) hv]1/2). The results have shown a similar behavior for both additions under UV light irradiation, with 3% being the addition with the highest photocatalytic efficiency obtained in the early ages of curing time. TiO2−xNy showed activity under irradiation with visible light, unlike TiO2, which could only be activated under UV light. At the late curing ages, the samples with 3% of TiO2-xNy showed the highest efficiency under irradiation of UV and visible light.

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Investigation of the photocatalytic efficiency of tantalum alkoxy carboxylate-derived Ta2O5 nanoparticles in rhodamine B removal

Beilstein Journal of Nanotechnology ◽

10.3762/bjnano.8.65 ◽

2017 ◽

Vol 8 ◽

pp. 604-613 ◽

Cited By ~ 4

Author(s):

Subia Ambreen ◽

Mohammad Danish ◽

Narendra D Pandey ◽

Ashutosh Pandey

Keyword(s):

Rhodamine B ◽

Uv Light ◽

Sol Gel ◽

Light Irradiation ◽

Photocatalytic Efficiency ◽

Uv Light Irradiation ◽

Sol Gel Synthesis

Ta2O5 nanoparticles have been synthesized from alkoxy carboxylates of tantalum via the sol–gel route. Tantalum alkoxides were reacted with chlorocarboxylic acids in order to lower the susceptibility hydrolysis. When these modified alkoxy carboxylates were used in the sol–gel synthesis, they yielded Ta2O5 nanoparticles of better properties than those of the alkoxide-derived Ta2O5 nanoparticles. These nanoparticles efficiently removed rhodamine B under UV light irradiation.

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Degradation of Paracetamol by Photolysis Using C-N-codoped TiO2

Molekul ◽

10.20884/1.jm.2017.12.2.378 ◽

2017 ◽

Vol 12 (2) ◽

pp. 189

Author(s):

Vanny Yulia Safitri ◽

Adlis Santoni ◽

Diana Vanda Wellia ◽

Khoiriah Khoiriah ◽

Safni Safni

Keyword(s):

Water Pollution ◽

Visible Light ◽

Uv Light ◽

Light Irradiation ◽

Solar Light ◽

Tio2 Catalyst ◽

Codoped Tio2 ◽

Uv Light Irradiation ◽

Optimum Weight ◽

Visible Light Degradation

Paracetamol is generally used as analgesic and antipyretic drugs. Contamination paracetamol in the environment can occur because of waste material disposal from production site and immediate disposal of household that cause water pollution. Paracetamol is degraded by photolysis method under irradiation 10 watt UV-light (λ=365 nm), visible-light (Philips LED 13 watt 1400 lux) and solar-light with and without addition C-N-codoped TiO2catalyst. The solution is analyzed by UV-Vis spectrophotometer at λ 200-400 nm. Optimum weight of C-N-codoped TiO2 catalyst obtained is 20 mg under UV-light photolysis. Paracetamol 4 mg/L is degraded 45.48% after 120 minutes under UV-light irradiation without catalyst, and increases to be 69.31% by using 20 mg catalyst. While degradation percentage of paracetamol is 16.96 % without catalyst, the percentage increases to be 34.29% after using 20 mg catalyst for 120 minutes photolysis under visible-light. Degradation of paracetamol by solar light achieves only 12.27% in absance of catalyst for 120 minutes irradiation, but it increases significantly until 70.39% in presence of 20 mg catalyst.

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Construction of ZnxCd1−xS/CeO2 composites for enhanced photocatalytic activity and stability by chemical precipitation method

Modern Physics Letters B ◽

10.1142/s0217984921503334 ◽

2021 ◽

pp. 2150334

Author(s):

Yi-Feng Chai ◽

Zhong-Hua Zhu ◽

Ming-Wei Liu ◽

Jing Zeng ◽

Gui-Fang Huang ◽

...

Keyword(s):

Photocatalytic Activity ◽

Methyl Orange ◽

Visible Light ◽

Visible Light Irradiation ◽

Uv Light ◽

Chemical Precipitation ◽

Charge Carriers ◽

Light Irradiation ◽

Precipitation Method ◽

Uv Light Irradiation

Development photoinduced photocatalysts is a significant approach to improve photocatalytic activity and stability. Herein, we successfully prepared Zn[Formula: see text]Cd[Formula: see text]S/CeO2 composites by a facile method. It is found that the Zn[Formula: see text]Cd[Formula: see text]S/CeO2 composites show significant enhancement in photocatalytic activity for methyl orange (MO) degradation under visible and UV light irradiation. The degradation efficiency reaches up to 3.7 times higher than that of pure CeO2 under visible light irradiation. Moreover, the Zn[Formula: see text]Cd[Formula: see text]S/CeO2 samples have almost no loss of photocatalytic activity after five recycles, indicating good photocatalytic stability of the samples. The attractive photocatalytic activity of the Zn[Formula: see text]Cd[Formula: see text]S/CeO2 samples could be attributed to the robust charge carriers transfer and separation.

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Preparation and Photocatalytic Activity of TiO2/Fine Char for Removal of Rhodamine B

Journal of Nanomaterials ◽

10.1155/2015/538275 ◽

2015 ◽

Vol 2015 ◽

pp. 1-5 ◽

Cited By ~ 2

Author(s):

Mingjie Ma ◽

Weijie Guo ◽

Zhengpeng Yang ◽

Shanxiu Huang ◽

Guanyu Wang

Keyword(s):

Photocatalytic Activity ◽

Photocatalytic Degradation ◽

Rhodamine B ◽

Uv Light ◽

Sol Gel ◽

Tetrabutyl Titanate ◽

Light Illumination ◽

X Ray Diffraction ◽

X Ray ◽

Uv Light Irradiation

TiO2/fine char (FC) photocatalyst was prepared via sol-gel method with tetrabutyl titanate as the precursor and FC as the carrier. The structural property of TiO2/FC photocatalyst was investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM), and the photocatalytic activity of TiO2/FC was evaluated by photocatalytic degradation of rhodamine B (RhB) aqueous solution under UV light irradiation. The results showed that TiO2was successfully coated on the surface of FC, and the TiO2/FC photocatalyst had better photocatalytic efficiency and stability for degradation of RhB under UV light illumination as compared to that of the pure TiO2and FC. The study provided a novel way for the application of FC to the photocatalytic degradation of organic wastes.

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Enhanced photocatalytic performance of Bi2O3/H-ZSM-5 composite for rhodamine B degradation under UV light irradiation

Applied Surface Science ◽

10.1016/j.apsusc.2013.10.139 ◽

2014 ◽

Vol 289 ◽

pp. 224-229 ◽

Cited By ~ 25

Author(s):

Qizhao Wang ◽

Juan Hui ◽

Li Yang ◽

Haohao Huang ◽

Yuxia Cai ◽

...

Keyword(s):

Rhodamine B ◽

Photocatalytic Performance ◽

Uv Light ◽

Light Irradiation ◽

Uv Light Irradiation

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Rhodamine B Photocatalytic Degradation using CuO Particles under UV Light Irradiation for Applications in Industrial and Medical Fields

Evergreen ◽

10.5109/4055233 ◽

2020 ◽

Vol 7 (2) ◽

pp. 280-284

Author(s):

Nur Izzah Iwanina Zamri ◽

Siti Lailatul Noramalina Zulmajdi ◽

Eny Kusrini ◽

Karina Ayuningtyas ◽

Hartini M. Yasin ◽

...

Keyword(s):

Photocatalytic Degradation ◽

Rhodamine B ◽

Uv Light ◽

Light Irradiation ◽

Uv Light Irradiation

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Phase Transformation, Photocatalytic and Photoluminescent Properties of BiPO4 Catalysts Prepared by Solid-State Reaction: Degradation of Rhodamine B

Minerals ◽

10.3390/min11091007 ◽

2021 ◽

Vol 11 (9) ◽

pp. 1007

Author(s):

Abdessalam Bouddouch ◽

Elhassan Amaterz ◽

Bahcine Bakiz ◽

Aziz Taoufyq ◽

Frédéric Guinneton ◽

...

Keyword(s):

Solid State ◽

Rhodamine B ◽

Solid State Reaction ◽

Uv Light ◽

Morphological Changes ◽

Degradation Mechanism ◽

Light Irradiation ◽

Temperature Phase ◽

X Ray ◽

Uv Light Irradiation

Polycrystalline bismuth phosphate BiPO4 was synthesized by solid-state reaction at different temperatures varying from 500 to 900 °C. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDS) and Raman spectroscopy. The low-temperature phase of BiPO4 has monoclinic structure with a space group P21/n, and was transformed into the monoclinic phase P21/m with a slight distortion of monoclinic lattice when it was heated above 500 °C. The effect of the transformation on the structure, morphology and photocatalytic properties was examined. The photocatalytic activity of each sample, in presence of Rhodamine B (RhB) in aqueous solution, was carried out and analyzed under UV light irradiation. Photoexperiments showed that the material prepared at 500 °C is the best catalyst with degradation efficiency of the order of 96% after 12 min of reaction time under UV light irradiation. This high photocatalytic efficiency could be due to their structural and morphological changes. The photocatalytic degradation mechanism of RhB in the presence of the best photocatalyst BiP-500 °C is proposed. The stability of the catalyst was also examined by carrying out four successive tests of the degradation in the presence of BiP-500 °C. Total organic carbon (TOC) was used to further estimate the rate of mineralization in the presence of BiP-500 °C (83% TOC removal). Photoluminescence experiments performed under UV-laser light irradiation revealed emissions in the green-orange range, with optimal intensities for the mix systems observed at 550 °C.

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Photocatalytic Degradation of Carbaryl over Novel MWNT-TiO2 Nanocomposite under Visible Light Irradiation

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.233-235.476 ◽

2011 ◽

Vol 233-235 ◽

pp. 476-480

Author(s):

Ke Dai ◽

Hai Bo Chen ◽

Xu Li ◽

Hao Chen ◽

Qiao Yun Huang

Keyword(s):

Visible Light ◽

Visible Light Irradiation ◽

Ring Opening ◽

Uv Light ◽

Light Irradiation ◽

Photodegradation Efficiency ◽

Uv Light Irradiation ◽

Ring Opening Reaction ◽

Visible Light Driven ◽

Direct Growth

The MWNT-TiO2nanocomposite was synthesized via direct growth of TiO2nanoparticles on the surface of the functionalized MWNTs by the hydrothermal treatment and utilized as the photocatalyst in the carbaryl degradation under both visible light and UV light irradiation. Visible-light-driven activity and enhanced UV-light-driven activity are both achieved as the composite MWNTs with TiO2can efficiently enhance the light absorption and charge separation and then photocatalytic activity. The photodegradation efficiency of carbaryl was examined by HPLC and IC techniques, which demonstrates that carbaryl can be readily degraded under visible light irradiation. Based on the obtained experimental results, assisted with the computer simulation of carbaryl molecule on PM3 level, it is presumed that the degradation of carbaryl starts with the break of N21-C23 and C19-N21 bonds and ends in the generation of naphthalen-1-ol before the ring-opening reaction.

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Structure and Properties Evolution of Nanostructed AgBr/TiO2 Visible Light Photocatalyst in Cyclic Running

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.668.338 ◽

2013 ◽

Vol 668 ◽

pp. 338-342 ◽

Cited By ~ 1

Author(s):

Le Wei Qin ◽

Ke Feng He ◽

Wan Ping Chen

Keyword(s):

Visible Light ◽

Visible Light Irradiation ◽

Light Irradiation ◽

Precipitation Method ◽

Limiting Factor ◽

Photocatalytic Efficiency ◽

X Ray Diffraction ◽

Visible Light Photocatalyst ◽

X Ray ◽

Crystalline Growth

Nanostructured AgBr/TiO2 visible light photocatalyst was prepared through deposition-precipitation method with AgNO3, KBr and Ti(OBu )4 as the precursors. Though the photocatalyst showed a relatively high photocatalytic efficiency for degradation of methyl orange in water under visible light irradiation in the first cycle, its efficiency was obviously decreased in the subsequent cycles. X-ray diffraction indicated that there existed a dramatic crystalline growth of AgBr in the AgBr /TiO2 nanocomposite after visible light irradiation, which must increase the recombination rate of photo-generated electrons and holes and be responsible for the observed decrease in photocatalytic efficiency. Photo-induced crystalline growth of AgBr may be a limiting factor for the lifetime of AgBr/TiO2 visible light photocatalyst and more attention should be paid to it.

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