Enhanced Photocatalytic Degradation of Organic Pollutants Under Visible Light Using Ag-Modified TiO2 on Activated Carbon Fibers

NANO ◽  
2021 ◽  
pp. 2130009
Author(s):  
Wenrui Zhang ◽  
Yonghui Wang ◽  
Meilu Hao ◽  
Huawei Zhang ◽  
Peng Liang
Keyword(s):  
Activated Carbon ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
Organic Pollutants ◽  
Carbon Fibers ◽  
Electrochemical Impedance ◽  
Transmission Rate ◽  
Organic Pollutant ◽  
Activated Carbon Fibers ◽  
Adsorption Sites

Ag-modified TiO2 on activated carbon fibers (ACF) was synthesized and successfully used for the photocatalytic degradation of organic pollutants in this work. The physical properties of the materials were characterized using various methods such as X-ray diffraction, scanning electron microscope, Brunauer–Emmett–Teller, Fourier transform infrared, UV–Vis, electrochemical impedance spectroscopy and reusability tests. Besides, the effects of reaction parameters on photodegradation such as silver loading, light source, organic pollutant species and initial pollutant concentration were investigated. The results showed that Ag significantly increased the number of surface adsorption sites, improved the electron transmission rate and suppressed the complexation of e− and h[Formula: see text]. Under visible light, 1.5-Ag-TiO2/ACF [Formula: see text] revealed the best catalytic activity and reusability for dye removal and toluene adsorption. Based on the experimental results, a possible photocatalytic mechanism of Ag-TiO2/ACF was proposed. This study will provide a theoretical basis for the application of Ag-TiO2/ACF photocatalyst in the field of organic pollutants treatment.

scholarly journals Magnetic Field-Assisted Photocatalytic Degradation of Organic Pollutants over Bi1−xRxFeO3 (R = Ce, Tb; x = 0.00, 0.05, 0.10 and 0.15) Nanostructures

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4079
Author(s):  
Radhalayam Dhanalakshmi ◽  
Nambi Venkatesan Giridharan ◽  
Juliano C. Denardin
Keyword(s):  
Magnetic Field ◽  
Rare Earth ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
Organic Pollutants ◽  
Visible Light Irradiation ◽  
Organic Pollutant ◽  
Hydrothermal Process ◽  
Phenol Red ◽  
Magnetic Features

Magnetic-field-accelerated photocatalytic degradation of the phenol red (PR) as a model organic pollutant was studied using rare-earth elements modified BiFeO3 (Bi1−xRxFeO3 (R = Ce, Tb; x = 0.0, 0.05, 0.10 and 0.15); BFO: RE) nanostructures. The nanostructures were prepared via the hydrothermal process and their morphological, structural, functional, optical and magnetic features were investigated in detail. The effect of magnetic fields (MFs) on photocatalysis were examined by applying the different MFs under visible light irradiation. The enhanced photodegradation efficiencies were achieved by increasing the MF up to 0.5T and reduced at 0.7T for the compositions x = 0.10 in both Ce and Tb substituted BFO. Further, mineralization efficiencies of PR, reproducibility of MF-assisted photocatalysis, stability and recyclability of BFO: RE nanostructures were also tested.

Effect of two types of adsorption sites of activated carbon fibers on nitrate ion adsorption

2021 ◽  
Vol 289 ◽  
pp. 112484
Author(s):  
Yukiyoshi Tsuchiya ◽  
Yusuke Yamaya ◽  
Yoshimasa Amano ◽  
Motoi Machida
Keyword(s):  
Activated Carbon ◽  
Carbon Fibers ◽  
Ion Adsorption ◽  
Activated Carbon Fibers ◽  
Nitrate Ion ◽  
Adsorption Sites

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.

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