scholarly journals Enhanced Performance of Photocatalytic Treatment of Congo Red Wastewater by CNTs-Ag Modified TiO2 Under Visible Light

2021 ◽  
Author(s):  
Yuewei Yang ◽  
Kai Liu ◽  
Fengfei Sun ◽  
Yanyan Liu ◽  
Junfeng Chen
Keyword(s):  
Titanium Dioxide ◽  
Visible Light ◽  
Congo Red ◽  
Organic Dyes ◽  
Removal Rate ◽  
Crystal Plane ◽  
Mechanical Mixing ◽  
Ternary Composite ◽  
Printing And Dyeing Wastewater ◽  
Mixing Method

Abstract In order to improve the treatment efficiency of printing and dyeing wastewater, the carbon nanotubes -silver modified -titanium dioxide (CNTs-Ag-TiO2, CAT) ternary composite was prepared by a mechanical mixing method. It was found that the morphology of the prepared CAT sample was uniformly coated with strips of CNTs, speckled Ag and lumpy TiO2.The (002) crystal plane of CNTs, the (101) crystal plane of TiO2 and the (111) crystal plane of Ag were observed, which possessed functional groups such as Ti-OH and Ti-O-C, indicating that the prepared CAT sample had photocatalytic reaction sites. The visible light utilization of titanium dioxide can be improved. The treatment effect of different proportions of CNTs-Ag-TiO2 on Congo red wastewater was tested, and the results showed that the optimum degradation effect of Congo red wastewater was CNTs: Ag = 10:1, and the treated amount of CNTs/Ag was 15%, and the removal rate of Congo red wastewater could reach 100% within 140min. The excellent removal effect of CAT ternary composite on Congo red wastewater provided a new idea and way for the modification of TiO2 and its composites for the potential of organic dyes degradation.

scholarly journals Adsorption and photo-Fenton catalytic degradation of organic dyes over crystalline LaFeO3-doped porous silica

RSC Advances ◽  
2018 ◽  
Vol 8 (63) ◽  
pp. 36181-36190 ◽  
Author(s):  
Thi To Nga Phan ◽  
Aleksandar N. Nikoloski ◽  
Parisa Arabzadeh Bahri ◽  
Dan Li
Keyword(s):  
Mesoporous Silica ◽  
Visible Light ◽  
Organic Dyes ◽  
Removal Rate ◽  
Porous Silica ◽  
Catalytic Degradation ◽  
High Removal Rate

LFO-doped mesoporous silica yielded high removal rate of dye, due to the dark adsorption and visible light-induced photo-Fenton degradation.

scholarly journals Photocatalytic Degradation of Organic Dyes under Visible Light on N-DopedTiO2Photocatalysts

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Olga Sacco ◽  
Marco Stoller ◽  
Vincenzo Vaiano ◽  
Paolo Ciambelli ◽  
Angelo Chianese ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
Organic Dyes ◽  
Operating Conditions ◽  
Visible Range ◽  
Bandgap Energy ◽  
Titanium Tetraisopropoxide ◽  
Light Emitting ◽  
The Right

This study was focused on the application of white and blue light emitting diodes (LEDs) as sources for the photocatalytic degradation of organic dyes in liquid phase with visible light. The photocatalytic activity of N-doped titanium dioxide, synthesized by direct hydrolysis of titanium tetraisopropoxide with ammonia, was evaluated by means of a batch photoreactor. The bandgap energy of titanium dioxide was moved in the visible range from 3.3 eV to 2.5 eV. The visible light responsive photocatalysts showed remarkably effective activity in decolorization process and in the removal of total organic carbon. Methylene blue was also used as a model dye to study the influence of several parameters such as catalyst weight and initial concentration. The effect of dye on the photocatalytic performance was verified with methyl orange (MO). The results demonstrated that the right selection of operating conditions allows to effectively degrade different dyes with the N-doped TiO2photocatalysts irradiated with visible light emitted by LEDs.

Rhodamines as Photocatalyst in Organic Synthesis

2020 ◽  
Vol 07 ◽  
Author(s):  
Avik K. Bagdi ◽  
Papiya Sikdar
Keyword(s):  
Visible Light ◽  
Organic Synthesis ◽  
Organic Dyes ◽  
Transition Metal Catalysts ◽  
Visible Light Photocatalysis ◽  
Eosin Y ◽  
Organic Transformations ◽  
The Sustainable Development ◽  
Mechanistic Pathway ◽  
Green Model

Abstract:: Organic synthesis under environment friendly conditions has great impact in the sustainable development. In this context, visible light photocatalysis has emerged as a green model as this offers an energy-efficient pathway towards the organic transformation. Different transition-metal catalysts (Ir-, Ru-, Cu- etc) and organic dyes (eosin Y, rose bengal, methylene blue etc) are well-known photocatalysts in organic synthesis. Apart from the well-known organophotoredox catalysts, rhodamines (Rhodamine B and Rhodamine 6G) have been also employed as efficient photocatalysts for different organic transformations. In this review, we will focus on the photocatalysis by rhodamines in organic synthesis. Mechanistic pathway of the methodologies will also be discussed. We believe this review will stimulate the employment of rhodamines in the visible light photocatalysis for efficient organic transformations in the future.

Photodegradation of organic dyes by PAN/SiO2-TiO2-NH2 nanofiber membrane under visible light

2019 ◽  
Vol 224 ◽  
pp. 509-514 ◽  
Author(s):  
Alaa Khalil ◽  
Nada M. Aboamera ◽  
Walaa S. Nasser ◽  
Walaa H. Mahmoud ◽  
Gehad G. Mohamed
Keyword(s):  
Visible Light ◽  
Organic Dyes ◽  
Nanofiber Membrane
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