Fabrication of visible-light responsive TiO2@C photocatalyst with an ultra-thin carbon layer to efficiently degrade organic pollutants

2020 ◽  
Vol 532 ◽  
pp. 147482 ◽  
Author(s):  
Xin Gao ◽  
Peng-Gang Ren ◽  
Jin Wang ◽  
Fang Ren ◽  
Zhong Dai ◽  
...  
Keyword(s):  
Visible Light ◽  
Organic Pollutants ◽  
Carbon Layer ◽  
Thin Carbon

Thin carbon layer coated Ti3+-TiO2nanocrystallites for visible-light driven photocatalysis

Nanoscale ◽  
2015 ◽  
Vol 7 (11) ◽  
pp. 5035-5045 ◽  
Author(s):  
Baojiang Jiang ◽  
Yunqi Tang ◽  
Yang Qu ◽  
Jian-Qiang Wang ◽  
Ying Xie ◽  
...  
Keyword(s):  
Visible Light ◽  
Carbon Layer ◽  
Thin Carbon ◽  
Visible Light Driven

Problems with oxygen analysis in the system MgO-Al2O3-SiO2 with the electron microprobe

1992 ◽  
Vol 50 (2) ◽  
pp. 1624-1625
Author(s):  
Michel Fialin ◽  
Guy Rémond
Keyword(s):  
Transition Metal ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
Electrostatic Charge ◽  
Carbon Layer ◽  
Sample Holder ◽  
Rock Matrix ◽  
Electrical Discharges ◽  
Thin Carbon ◽  
Beam Instabilities

Oxygen-bearing minerals are generally strong insulators (e.g. silicates), or if not (e.g. transition metal oxides), they are included within a rock matrix which electrically isolates them from the sample holder contacts. In this respect, a thin carbon layer (150 Å in our laboratory) is evaporated on the sections in order to restore the conductivity. For silicates, overestimated oxygen concentrations are usually noted when transition metal oxides are used as standards. These trends corroborate the results of Bastin and Heijligers on MgO, Al2O3 and SiO2. According to our experiments, these errors are independent of the accelerating voltage used (fig.l).Owing to the low density of preexisting defects within the Al2O3 single-crystal, no significant charge buildup occurs under irradiation at low accelerating voltage (< 10keV). As a consequence, neither beam instabilities, due to electrical discharges within the excited volume, nor losses of energy for beam electrons before striking the sample, due to the presence of the electrostatic charge-induced potential, are noted : measurements from both coated and uncoated samples give comparable results which demonstrates that the carbon coating is not the cause of the observed errors.

Electrospun-based TiO2 nanofibers for organic pollutant photodegradation: a comprehensive review

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Khee Chung Hui ◽  
Hazwani Suhaimi ◽  
Nonni Soraya Sambudi
Keyword(s):  
Visible Light ◽  
Organic Pollutants ◽  
Organic Pollutant ◽  
Hollow Fibers ◽  
Promising Alternative ◽  
Tio2 Nanofibers ◽  
As Doping ◽  
Secondary Pollutants ◽  
Photocatalytic Reactors ◽  
Light Area

Abstract Titanium dioxide (TiO2) is commonly used as a photocatalyst in the removal of organic pollutants. However, weaknesses of TiO2 such as fast charge recombination and low visible light usage limit its industrial application. Furthermore, photocatalysts that are lost during the treatment of pollutants create the problem of secondary pollutants. Electrospun-based TiO2 fiber is a promising alternative to immobilize TiO2 and to improve its performance in photodegradation. Some strategies have been employed in fabricating the photocatalytic fibers by producing hollow fibers, porous fibers, composite TiO2 with magnetic materials, graphene oxide, as well as doping TiO2 with metal. The modification of TiO2 can improve the absorption of TiO2 to the visible light area, act as an electron acceptor, provide large surface area, and promote the phase transformation of TiO2. The improvement of TiO2 properties can enhance carrier transfer rate which reduces the recombination and promotes the generation of radicals that potentially degrade organic pollutants. The recyclability of fibers, calcination effect, photocatalytic reactors used, operation parameters involved in photodegradation as well as the commercialization potential of TiO2 fibers are also discussed in this review.

In-situ synthesis of a hybrid Fe (Co)/MXene/ZSM-5 catalyst for phenol abatement

2021 ◽  
Author(s):  
Changquan Zhang ◽  
Chaolin Li ◽  
Gang Chen ◽  
Fei Ji ◽  
Yiyong Shen ◽  
...  
Keyword(s):  
Visible Light ◽  
Organic Pollutants ◽  
In Situ Synthesis ◽  
Sulfate Radical

Sulfate radical based photocatalysis is recognized as an effective approach for the photodegradation of organic pollutants in wastewater. To overcome the defects of weak visible light absorptivity and low catalytic...

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