Enhancing visible-light-activity of Ti-based MOFs based on extending the conjugated degree of organic ligands and photocatalytic degradation process and mechanism in real industrial textile wastewaters

2021 ◽  
Vol 9 (6) ◽  
pp. 106428
Author(s):  
Ximing Guo ◽  
Xueyao Tian ◽  
Xin Xu ◽  
Jinru He
Keyword(s):  
Visible Light ◽  
Photocatalytic Degradation ◽  
Degradation Process ◽  
Organic Ligands ◽  
Light Activity ◽  
Textile Wastewaters

Synthesis of Bi/Bi2O2SiO3/Bi2WO6 Composites with Enhanced Visible Light Activity in Photocatalytic Degradation of Organic Compounds

2020 ◽  
Vol 94 (6) ◽  
pp. 1254-1261
Author(s):  
Zhi Zhang ◽  
Chentao Zou ◽  
Jian Zhou ◽  
Zhiyuan Yang ◽  
Mengjun Liang ◽  
...  
Keyword(s):  
Visible Light ◽  
Photocatalytic Degradation ◽  
Organic Compounds ◽  
Light Activity

scholarly journals Thermally treated zeolitic imidazolate framework-8 (ZIF-8) for visible light photocatalytic degradation of gaseous formaldehyde

2020 ◽  
Vol 11 (26) ◽  
pp. 6670-6681 ◽  
Author(s):  
Tianqi Wang ◽  
Yufei Wang ◽  
Mingzhe Sun ◽  
Aamir Hanif ◽  
Hao Wu ◽  
...  
Keyword(s):  
Visible Light ◽  
Photocatalytic Degradation ◽  
Wide Spectrum ◽  
Organic Ligands ◽  
Zeolitic Imidazolate Framework ◽  
Gaseous Formaldehyde ◽  
Visible Light Photocatalytic ◽  
Thermally Treated

The isocyanate groups (–NCO) derived from –NC– bonds in the organic ligands enables the thermally treated ZIF-8 to act as wide-spectrum photocatalyst.

Synthesis and Characterization of WO3and#183;0.33H2O/Ag2MoO4 Composites as a Visible-Light-Driven Photocatalyst for Rhodamine B and Levofloxacin Degradation

2020 ◽  
Vol 42 (6) ◽  
pp. 827-827
Author(s):  
Yun Xuan Fu Yun Xuan Fu ◽  
Yan Li Yan Li ◽  
Tian Long Chang Tian Long Chang ◽  
Xu Tao Liu Xu Tao Liu ◽  
Xiang Feng Wu Xiang Feng Wu ◽  
...  
Keyword(s):  
Visible Light ◽  
Photocatalytic Degradation ◽  
Rhodamine B ◽  
Organic Dyes ◽  
Degradation Process ◽  
Molar Ratio ◽  
Leading Role ◽  
Visible Light Driven

Visible-light-driven WO3and#183;0.33H2O/Ag2MoO4 composites have been prepared by using an in-situ growth of Ag2MoO4 nanoparticles on the surfaces of WO3and#183;0.33H2O. The photocatalytic activities of the samples were studied by degradation of rhodamine B and levofloxacin dilute solution. The synergistic photocatalytic mechanism was also analyzed. Experimental results reveal that the as-developed hybrids have higher photocatalytic activity than pure samples. When the theoretical molar ratio of WO3and#183;0.33H2O to Na2MoO4and#183;2H2O is 1:0.15, the as-developed hybrids have the highest photocatalytic degradation efficiency of 99.0% for rhodamine B in 45 min and 40.9% for levofloxacin in 120 min. Furthermore, there are chemical bonds between WO3and#183;0.33H2O and Ag2MoO4. In addition, the super oxide radicals play the leading role during the photocatalytic degradation process of the samples. This work will provide reference for treatment of organic dyes and antibiotics pollution in water with using solar energy.

Visible Light Photocatalytic Degradation of Methylene Blue over N-Doped TiO2

2014 ◽  
Vol 609-610 ◽  
pp. 141-146 ◽  
Author(s):  
Yu Long Hu ◽  
Li Qing Zhou ◽  
Hong Fang Liu ◽  
Xing Peng Guo
Keyword(s):  
Methylene Blue ◽  
Nitrogen Atom ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
Functional Group ◽  
Degradation Process ◽  
Degradation Pathway ◽  
Methyl Group ◽  
Intermediate Products ◽  
Visible Light Photocatalytic

The visible light photocatalytic degradation of methylene blue (MB) over N-doped TiO2 (N-TiO2) was investigated. The intermediate products of MB in the photocatalytic degradation process were analyzed by HPLC-MS technique. The results show that the cleavages of CS+=C and CN=C functional group in the central aromatic ring and the cleavage of N-C bond between the methyl group and nitrogen atom all can occur in the visible light photocatalytic degradation process over N-TiO2, but MB is difficult to be mineralized completely to the inorganic products. A detailed degradation pathway of MB has been proposed on the basis of a careful identification of intermediate products.

Photodegradation of Microcystine-LR Uising BiOBr under UV and Visible Light Irradiation

2014 ◽  
Vol 488-489 ◽  
pp. 248-251 ◽  
Author(s):  
Yan Fen Fang ◽  
Xin Yu Li ◽  
Man Ke Jia ◽  
Ying Ping Huang
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Layered Structure ◽  
Energy Gap ◽  
Degradation Process ◽  
Light Irradiation ◽  
Reaction Intermediates ◽  
Light Activity ◽  
Degradation Time

BiOBr photocatalyst was prepared by cetyl pyridine bromide (CPB). The characterization of BiOBr was measured by DRS UV-Vis, XRD, BET, TEM/HRTEM, XPS and IR. The energy gap of BiOBr was merely 2.62eV which can absorb visible light (λ473nm), BiOBr was identified to the tetragonal phase exhibits significantly enhanced structural properties and the ration of the amount of Bi and Br on the surface of BiOBr is 1. The BET of BiOBr was 12.03 m2/g and was layered structure. Compared with traditional catalyst TiO2(P25), the prepared BiOBr has good visible light activity and can degradated Microcystine-LR(MC-LR) under UV and Visible light irradation. The degradation time of MC-LR between UV and vis-light irradiation is respectively 60min and 150min under the same condition. It was indicated that the oxidizing rate of O2- in UV system is obviously higher than that of·OH in the vis-light system by ESR experiments, which is also proved in the differences of reaction intermediates in the degradation process under the two lamps.

scholarly journals Aqueous synthesis of Nb-modified SnO2 quantum dots for efficient photocatalytic degradation of polyethylene for in situ agricultural waste treatment

2021 ◽  
Vol 10 (1) ◽  
pp. 499-506
Author(s):  
Jia Shao ◽  
Kai Deng ◽  
Le Chen ◽  
Chaomeng Guo ◽  
Congshan Zhao ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
Waste Treatment ◽  
Low Cost ◽  
Agricultural Waste ◽  
Degradation Process ◽  
Active Species ◽  
Aqueous Synthesis

Abstract Low density polyethylene is widely used in agricultural production. It is of low cost and able to significantly improve the quality of fruits. However, its decomposition under natural circumstances needs more than one hundred of years. If not removed in time, it is hazardous to the ecological environment and crops. Up to now, the removal techniques of polyethylene films are polluted, expensive, and difficult to employ. A novel method is proposed for in situ removal of polyethylene by an effective and environmental friendly technique with low cost. The Nb-modified SnO2 quantum dots are prepared for the efficient photocatalytic degradation of polyethylene under visible light. The green synthesis of the photocatalyst includes the procedures of hydrolysis, oxidation, and hydrothermal treatment in aqueous solution. The Nb-modified SnO2 has a band gap of 2.95 eV, which enhances its absorption of visible light. A degradation efficiency of 29% is obtained within 6 h under visible irradiation. The hydroxyl radicals (•OH) are main active species in the degradation process. The prepared Nb-SnO2 quantum dots demonstrate a promising application in the photocatalytic degradation of polyethylene, contributing a novel strategy for the in situ treatment of agricultural wastes.

scholarly journals Photocatalytic degradation of neonicotinoid insecticides using sulfate-doped Ag3PO4 with enhanced visible light activity

2020 ◽  
Vol 402 ◽  
pp. 126183 ◽  
Author(s):  
Youn-Jun Lee ◽  
Jin-Kyu Kang ◽  
Seong-Jik Park ◽  
Chang-Gu Lee ◽  
Joon-Kwan Moon ◽  
...  
Keyword(s):  
Visible Light ◽  
Photocatalytic Degradation ◽  
Neonicotinoid Insecticides ◽  
Light Activity

scholarly journals DFT study of binding and electron transfer from colorless aromatic pollutants to a TiO2 nanocluster: Application to photocatalytic degradation under visible light irradiation

2014 ◽  
Vol 5 ◽  
pp. 1016-1030 ◽  
Author(s):  
Corneliu I Oprea ◽  
Petre Panait ◽  
Mihai A Gîrţu
Keyword(s):  
Visible Light ◽  
Photocatalytic Degradation ◽  
Visible Light Irradiation ◽  
Density Functional ◽  
Energy Levels ◽  
Degradation Process ◽  
Light Irradiation ◽  
Functional Theory ◽  
Water Cleaning ◽  
Effective Water

We report results of density functional theory (DFT) calculations on some colorless aromatic systems adsorbed on a TiO2 nanocluster, in order to explain experimental results regarding the photocatalytic degradation of these pollutants under visible light irradiation. Based on our modeling, we are able to clarify why transparent pollutants can degrade under visible light in the presence of a catalyst that absorbs only in the UV, to explain experimental data regarding differences in the efficiency of the degradation process, and to state the key requirements for effective water-cleaning. For that purpose, we analyze the absorption spectrum of the free and adsorbed molecules, the binding configurations, the matching of the energy levels with the oxide catalyst and the likelihood of the charge-transfer to the substrate. The comparison between several colorless aniline and phenolic systems allows a correlation between the chemical structure and the degradation rate of these pollutants.

Performance of Bi20TiO32 for Photocatalytic Degradation of Organic Pollutants in Water

2011 ◽  
Vol 233-235 ◽  
pp. 724-727
Author(s):  
Xu Hui Sun ◽  
Guo Hua Zhang ◽  
Lin Sun ◽  
Jun Ma
Keyword(s):  
Waste Water ◽  
Methyl Orange ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
Surface Charge ◽  
Organic Pollutants ◽  
Light Wavelength ◽  
Photocatalytic Process ◽  
Optimum Ph ◽  
Light Activity

The factors that influence the performance of Bi20TiO32were discussed, and the removal of TOC in the analogue waste water was also examined. The shorter the light wavelength or the more the intensity, the more efficient the photocatalytic process. Different substance has different optimum pH for being photodegraded by photocatalyst Bi20TiO32, which may be related with its surface charge. Aeration have little benefit for decomposing the organics. Some organics like methyl orange and phenol can be photodegraded by Bi20TiO32completely. Bi20TiO32has visible-light activity for the degradation of organics.

scholarly journals Use of Visible Light Modulation Techniques in Urea Photocatalytic Degradation

Water ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 1642
Author(s):  
Vaiano ◽  
Sacco ◽  
Capua ◽  
Femia ◽  
Sannino
Keyword(s):  
Visible Light ◽  
Photocatalytic Degradation ◽  
Pulse Width Modulation ◽  
Irradiation Time ◽  
Energy Resource ◽  
Degradation Process ◽  
Light Modulation ◽  
Visible Light Photocatalyst ◽  
Photocatalytic System ◽  
Modulation Techniques

The aim of this work was to analyze the effect of visible LED dimming duty-cycle modulation techniques in a photocatalytic system for urea degradation using a visible light photocatalyst immobilized on macroscopic supports. For this reason, the effect of different LED dimming techniques was investigated and compared in terms of urea degradation together with ammonia and nitrate production during the irradiation time. The experimental results evidenced that using a visible LED dimming modulation with variable-peak variable-duty pulse-width modulation (PWM) allows to improve the photocatalytic degradation process, with respect to classical LED dimming with fixed-peak fixed-duty PWM, and influences the product’s distribution of ammonia and nitrate in water. Therefore, the proof of concept herein proposed could be considered as preliminary potential results to be used in water recycling applications with a particular emphasis in recovery of urea photodegradation byproducts, such as ammonia, from wastewater that could be used as potential resources and an energy resource.

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