Synthesis of La2O3-NiO photocatalyst and kinetics of degradation of dye wastewater under visible light irradiation

2011 ◽  
Author(s):  
Zhiyuan Yang ◽  
Peng Liu ◽  
Pan Ran
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Light Irradiation ◽  
Dye Wastewater ◽  
Kinetics Of Degradation ◽  
Kinetics Of

scholarly journals Adsorption and Photocatalytic Kinetics of Visible-Light Response N-Doped TiO2Nanocatalyst for Indoor Acetaldehyde Removal under Dark and Light Conditions

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Yu-Hao Lin ◽  
Chih-Huang Weng ◽  
Jing-Hua Tzeng ◽  
Yao-Tung Lin
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Light Response ◽  
Reaction Scheme ◽  
Light Irradiation ◽  
Light Conditions ◽  
Volatile Organic ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order ◽  
Kinetics Of

Understanding the removal nature of the indoor volatile organic compounds under realistic environment conditions would give clear guidance for the development of air purification devices. The study investigated the removal of indoor acetaldehyde using visible-light-responsive N-doped TiO2(N-TiO2) photocatalyst under visible-light irradiation (light) and in the absence of light (dark). The adsorption kinetics of acetaldehyde onto N-TiO2followed a pseudo-second-order model. The magnitude of acetaldehyde adsorption is proportional to temperature, and the results were fitted to the Langmuir isotherm model. Moreover, the effect of initial acetaldehyde concentration and visible-light intensity on the photooxidation of acetaldehyde was well described by the Langmuir-Hinshelwood model. Results show that the mesoporous N-TiO2catalyst had a high ability to absorb acetaldehyde in the dark condition, and then acetaldehyde was subsequently photooxidized under visible-light irradiation. The adsorption capacity was found to increase with decreasing temperature. The negative value ofΔG° and the positive value ofΔS° indicate that the adsorption of acetaldehyde onto N-TiO2was a spontaneous process. Finally, a reaction scheme for removal process of indoor acetaldehyde by N-TiO2was proposed.

scholarly journals Degradation of Penicillin G by Visible Light Irradiation-Assisted Biotransformation by Whole Cell paracoccus sp .

2020 ◽  
Author(s):  
Peng Wang ◽  
Chen Shen ◽  
Qinqin Cong ◽  
Jialin Lu ◽  
Xiaochun Wang
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Genomic Analysis ◽  
Light Irradiation ◽  
Penicillin G ◽  
Key Factors ◽  
Whole Cell ◽  
H Nmr ◽  
Kinetics Of ◽  
Catalytic Effects

Abstract Background: The Paracoccus sp. strain (KDSPL-02) isolated from sludge was identified and evaluated for catalytic activity in the degradation of penicillin G. Results: High degradation efficiency and synergistic catalytic effects of the whole cell and visible light without additional catalysts were observed. The key factors influencing the degradation and kinetics of penicillin G were investigated. The results showed the phenylacetic acid, which was produced during penicillin G biodegradation, exhibited stronger inhibiting effects on KDSPL-02. However, this effect was reduced by visible light irradiation without any additional photocatalyst; furthermore, the rate of penicillin G biodegradation was accelerated, reaching a 100% rate in 12 h at a penicillin G concentration of 1.2 g/L. Four key intermediates produced during penicillin G degradation were isolated and identified by LC–MS, 1H NMR, and 13C NMR. Enzymes involved in the PAA pathway were proposed from a genomic analysis of paracoccus sp. KDSPL-02. Conclusions:These results provide a new method for bio-degrading of penicillin or other antibiotic pollutants using photoaccelerating biocatalysts with greater efficiency and more environmentally friendly conditions.

scholarly journals Preparation and Characterization of Tubelike g-C3N4/Ag3PO4 Heterojunction with Enhanced Visible-Light Photocatalytic Activity

Crystals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1373
Author(s):  
Xin Yan ◽  
Yuanyuan Wang ◽  
Bingbing Kang ◽  
Zhuo Li ◽  
Yanhui Niu
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Close Contact ◽  
Light Irradiation ◽  
Precipitation Method ◽  
Dye Wastewater ◽  
Potential Threat ◽  
High Quantum Efficiency ◽  
Photocatalytic Ability

Water pollution caused by dye wastewater is a potential threat to human health. Using photocatalysis technology to deal with dye wastewater has the advantages of strong purification and no secondary pollution, so it is greatly significant to look for new visible-light photocatalysts with high photocatalytic ability for dye wastewater degradation. Semiconductor photocatalyst silver phosphate (Ag3PO4) has high quantum efficiency and photocatalytic degradation activity. However, Ag3PO4 is prone to photoelectron corrosion and becomes unstable during photocatalysis, which severely limits its application in this field. In this study, a tubelike g-C3N4/Ag3PO4 heterojunction was constructed by the chemical precipitation method. An Ag3PO4 nanoparticle was loaded onto the surface of the tubelike g-C3N4, forming close contact. The photocatalytic activity of the photocatalyst was evaluated by the degradation of RhB under visible-light irradiation. The tubelike g-C3N4/Ag3PO4-5% heterojunction exhibited optimal photocatalytic performance. In an optimal process, the degradation rate of the RhB is 90% under visible-light irradiation for 40 min. The recycling experiment showed that there was no apparent decrease in the activity of tubelike g-C3N4/Ag3PO4-5% heterojunction after five consecutive runs. A possible Z-type mechanism is proposed to explain the high activity and stability of the heterojunction.

scholarly journals Degradation of Penicillin G by Visible Light Irradiation-assisted Biotransformation by Whole Cell Paracoccus Sp.

2021 ◽  
Author(s):  
Peng Wang ◽  
Chen Shen ◽  
Qinqin Cong ◽  
Jihua Liu ◽  
Xiaochun Wang
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Genomic Analysis ◽  
Light Irradiation ◽  
Penicillin G ◽  
Key Factors ◽  
Whole Cell ◽  
H Nmr ◽  
Kinetics Of ◽  
Catalytic Effects

Abstract Background: The Paracoccus sp. strain (KDSPL-02) isolated from sludge was identified and evaluated for catalytic activity in the degradation of penicillin G. Results: High degradation efficiency and synergistic catalytic effects of the whole cell and visible light without additional catalysts were observed. The key factors influencing the degradation and kinetics of penicillin G were investigated. The results showed the phenylacetic acid, which was produced during penicillin G biodegradation, exhibited stronger inhibiting effects on KDSPL-02. However, this effect was reduced by visible light irradiation without any additional photocatalyst; furthermore, the rate of penicillin G biodegradation was accelerated, reaching a 100% rate in 12 h at a penicillin G concentration of 1.2 g/L. Four key intermediates produced during penicillin G degradation were isolated and identified by LC–MS, 1H NMR, and 13C NMR. Enzymes involved in the PAA pathway were proposed from a genomic analysis of paracoccus sp. KDSPL-02. Conclusions:These results provide a new method for bio-degrading of penicillin or other antibiotic pollutants using photoaccelerating biocatalysts with greater efficiency and more environmentally friendly conditions.

Kinetics of Humic Acids Photodegradation in Aqueous Solution Using TiO2/ ZnO/Co Composite Photocatalyst

2019 ◽  
Vol 962 ◽  
pp. 117-121
Author(s):  
Muhammad Ali Zulfikar ◽  
Dira Irnameria ◽  
Muhamad Nasir
Keyword(s):  
Aqueous Solution ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Degradation Rate ◽  
Light Irradiation ◽  
Organic Substances ◽  
Composite Photocatalyst ◽  
Taste And Odor ◽  
Uv Visible ◽  
Kinetics Of

Humic acid (HA) is a major component of natural organic substances and affects water quality, such as color, taste and odor. Therefore, removal of HA from surface water or wastewater is very important. In this paper, the photodegradation kinetics of these compounds using TiO2/ZnO/Co composite photocatalyst under visible light irradiation was investigated. The progress of photocatalytic degradation of the HA has been observed by measuring the absorbance in UV-Visible spectrophotometer. The results reveal that the TiO2/ZnO/Co composite photocatalyst exhibits much better photocatalytic activity than those of pure TiO2 and TiO2/ZnO on photodegradation of HA under visible light irradiation, with degradation rate constants were found 0.0163, 0.0079 and 0.0032 (min-1), respectively.

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