Degradation of Emerging Contaminants Using Fe-Doped TiO2 Under UV and Visible Radiation

2019 ◽  
pp. 263-285 ◽  
Author(s):  
Irwing M. Ramírez-Sánchez ◽  
Oscar D. Máynez-Navarro ◽  
Erick R. Bandala
Keyword(s):  
Emerging Contaminants ◽  
Visible Radiation ◽  
Doped Tio2

scholarly journals Light-Induced Advanced Oxidation Processes as PFAS Remediation Methods: A Review

2021 ◽  
Vol 11 (18) ◽  
pp. 8458
Author(s):  
Domenico Leonello ◽  
Murilo Alexandre Fendrich ◽  
Francesco Parrino ◽  
Nainesh Patel ◽  
Michele Orlandi ◽  
...  
Keyword(s):  
Large Scale ◽  
Advanced Oxidation Processes ◽  
Emerging Contaminants ◽  
New Technologies ◽  
Advanced Oxidation ◽  
Research Activity ◽  
Visible Radiation ◽  
Oxidation Processes ◽  
Uv Visible ◽  
Contamination Problem

PFAS substances, which have been under investigation in recent years, are certainly some of the most critical emerging contaminants. Their presence in drinking water, correlated with diseases, is consistently being confirmed by scientific studies in the academic and health sectors. With the aim of developing new technologies to mitigate the water contamination problem, research activity based on advanced oxidation processes for PFAS dealkylation and subsequent mineralization is active. While UV radiation could be directly employed for decontamination, there are nevertheless considerable problems regarding its use, even from a large-scale perspective. In contrast, the use of cheap, robust, and green photocatalytic materials active under near UV-visible radiation shows interesting prospects. In this paper we take stock of the health problems related to PFAS, and then provide an update on strategies based on the use of photocatalysts and the latest findings regarding reaction mechanisms. Finally, we detail some brief considerations in relation to the economic aspects of possible solutions.

scholarly journals Characterization of Photoactive Fe-TiO2 Lime Coatings for Building Protection: The Role of Iron Content

Materials ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 1847 ◽  
Author(s):  
Chrysi Kapridaki ◽  
Nikolaos Xynidis ◽  
Eleftheria Vazgiouraki ◽  
Nikolaos Kallithrakas-Kontos ◽  
Pagona Maravelaki-Kalaitzaki
Keyword(s):  
Tio2 Nanoparticles ◽  
Photoelectron Spectroscopy ◽  
Sol Gel ◽  
Nitrogen Adsorption ◽  
Visible Radiation ◽  
Edge Structure ◽  
Doped Tio2 ◽  
X Ray ◽  
Vis Spectroscopy

Iron-doped TiO2 nanoparticles, ranging in Fe concentrations from 0.05 up to 1.00% w/w, were synthesized through a simple sol-gel method. Fourier-transform infrared spectroscopy (FTIR), X-ray powder diffraction (XRD), Ultraviolet-Visible (UV-Vis) spectroscopy, nitrogen adsorption−desorption isotherms, X-ray photoelectron spectroscopy (XPS), and X-ray absorption near-edge structure spectroscopy (XANES) were used to characterize the synthesized nanoparticles. The characterization of the Fe-doped TiO2 nanoparticles revealed the predominant presence of anatase crystalline form, as well as the incorporation of the Fe3+ ions into the crystal lattice of TiO2. The photocatalytic assessment of the Fe-doped TiO2 nanoparticles indicated that the low iron doping titania (0.05 and 0.10% w/w) have a positive effect on the photocatalytic degradation of Methyl Orange under visible radiation. Moreover, FTIR monitoring of calcium hydroxide pastes enriched with low Fe-doped TiO2 revealed enhancement of carbonation at both early and later stages. Improved photocatalytic performance and increased lime carbonation, observed in lime coatings with low Fe-doped TiO2 admixtures, established them as invaluable contributors to the protection of the built environment.

Near-field scanning optical microscopy

1986 ◽  
Vol 44 ◽  
pp. 642-643
Author(s):  
E. Betzig ◽  
A. Harootunian ◽  
M. Isaacson ◽  
A. Lewis
Keyword(s):  
Near Field ◽  
Optical Microscope ◽  
Visible Radiation ◽  
Field Methods ◽  
Optical Elements ◽  
Optical Region ◽  
Order Of Magnitude ◽  
Nondestructive Imaging ◽  
Scanning Optical Microscopy ◽  
Near Field Scanning

In general, conventional methods of optical imaging are limited in spatial resolution by either the wavelength of the radiation used or by the aberrations of the optical elements. This is true whether one uses a scanning probe or a fixed beam method. The reason for the wavelength limit of resolution is due to the far field methods of producing or detecting the radiation. If one resorts to restricting our probes to the near field optical region, then the possibility exists of obtaining spatial resolutions more than an order of magnitude smaller than the optical wavelength of the radiation used. In this paper, we will describe the principles underlying such "near field" imaging and present some preliminary results from a near field scanning optical microscope (NS0M) that uses visible radiation and is capable of resolutions comparable to an SEM. The advantage of such a technique is the possibility of completely nondestructive imaging in air at spatial resolutions of about 50nm.

Ferromagnetism Induced by Defects in Cr-doped TiO2 Nanopowders

2013 ◽  
Vol 28 (10) ◽  
pp. 1098-1102 ◽  
Author(s):  
Qian ZHAO ◽  
Ping WU
Keyword(s):  
Doped Tio2 ◽  
Tio2 Nanopowders

Pharmaceutically Active Compounds Degradation Using Doped TiO2 Functionalized Zeolite Photocatalyst

2018 ◽  
Vol 69 (1) ◽  
pp. 34-37 ◽  
Author(s):  
Monica Ihos ◽  
Corneliu Bogatu ◽  
Carmen Lazau ◽  
Florica Manea ◽  
Rodica Pode
Keyword(s):  
Organic Carbon ◽  
Active Compound ◽  
Uv Spectra ◽  
Pharmaceutically Active Compounds ◽  
Mineralization Process ◽  
Active Compounds ◽  
Spectra Analysis ◽  
Doped Tio2 ◽  
Toc Removal ◽  
Pharmaceutically Active Compound

The aim of this study was the investigation of photocatalytic degradation of pharmaceutically active compounds using doped TiO2 functionalized zeolite photocatalyst. Diclofenac (DCF), a non-steroidal anti-inflammatory drug, that represents a biorefractory micropollutant, was chosen as model of pharmaceutically active compound. The photocatalyst was Z-TiO2-Ag. The concentration of DCF in the working solutions was 10 mg/L,50 mg/L,100 mg/L and 200 mg/L and of photocatalyst 1 g/L in any experiments. The process was monitored by recording the UV spectra of the treated solutions and total organic carbon (TOC) determination. The UV spectra analysis and TOC removal proved that along the advanced degradation of DCF also a mineralization process occurred. The carried out research provided useful information envisaging the treatment of pharmaceutical effluents by photocatalysis.

Paramagnetic and Photocatalytic Properties of C-S co-Doped TiO2 Nanocatalysts

2018 ◽  
Vol 10 (6) ◽  
pp. 06039-1-06039-4 ◽  
Author(s):  
M. V. Bondarenko ◽  
◽  
T. A. Khalyavka ◽  
A. K. Melnyk ◽  
S. V. Camyshan ◽  
...  
Keyword(s):  
Photocatalytic Properties ◽  
Doped Tio2 ◽  
Co Doped
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