scholarly journals Application of ultraviolet light assisted titanium dioxide photocatalysis for food safety: A review

2016 ◽  
Vol 38 ◽  
pp. 105-115 ◽  
Author(s):  
Tamanna Ramesh ◽  
Balunkeswar Nayak ◽  
Aria Amirbahman ◽  
Carl P. Tripp ◽  
Sudarsan Mukhopadhyay
Keyword(s):  
Titanium Dioxide ◽  
Food Safety ◽  
Ultraviolet Light ◽  
Titanium Dioxide Photocatalysis

scholarly journals Photolysis and TiO2 Photocatalytic Treatment under UVC/VUV Irradiation for Simultaneous Degradation of Pesticides and Microorganisms

2020 ◽  
Vol 10 (13) ◽  
pp. 4493
Author(s):  
Sung Won Choi ◽  
Hafiz Muhammad Shahbaz ◽  
Jeong Un Kim ◽  
Da-Hyun Kim ◽  
Sohee Yoon ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Aqueous Solutions ◽  
Ultraviolet Light ◽  
E Coli ◽  
Log Reduction ◽  
Titanium Dioxide Photocatalysis ◽  
Combined Use ◽  
Significant Difference ◽  
Fresh Cut ◽  
Simultaneous Degradation

Efficiencies of various treatments for UVC photolysis (ultraviolet light-C at 254 nm), VUV photolysis (vacuum ultraviolet light at 254 nm and 185 nm), UVC-assisted titanium dioxide photocatalysis (UVC-TiO2), and VUV-assisted titanium dioxide photocatalysis (VUV-TiO2) were investigated for the degradation of pesticides including pyraclostrobin, boscalid, fludioxonil, and azoxystrobin and inactivation of microorganisms Escherichia coli K12 as a surrogate for E. coli O157:H7 and Saccharomyces cerevisiae in aqueous solutions and on the surface of fresh cut carrots. The degradation efficiencies of VUV were higher than for UVC on pesticides in aqueous solutions. However, there was no significant difference between degradation efficiencies for UVC and UVC-TiO2 treatments, and between VUV and VUV-TiO2 treatments. UVC, VUV, UVC-TiO2, and VUV-TiO2 showed similar inactivation effects against E. coli K12 and S. cerevisiae in aqueous solutions. The combined use of UVC and VUV treatments (combined UV) and combined use of UVC-TiO2 and VUV-TiO2 treatments (combined UV-TiO2) showed higher efficiencies (72–94% removal) for the removal of residual pesticides on fresh cut carrots than bubble water washing (53–73% removal). However, there was no significant difference in removal efficiency between combined UV and combined UV-TiO2 treatments. For E. coli K12 and S. cerevisiae on fresh cut carrots, the combined UV-TiO2 treatment (1.5 log and 1.6 log reduction, respectively) showed slightly higher inactivation effects than combined UV (1.3 log and 1.2 log reduction, respectively). Photolysis and TiO2 photocatalytic treatments under UV irradiation, including VUV as a light source, showed potential for the simultaneous degradation of pesticides and microorganisms as a non-chemical and residue-free technique for surface disinfection of fresh produce.

scholarly journals In vitro evaluation of visible light-activated titanium dioxide photocatalysis for in-office dental bleaching

2019 ◽  
Vol 38 (1) ◽  
pp. 68-74 ◽  
Author(s):  
Marla CUPPINI ◽  
Vicente Castelo Branco LEITUNE ◽  
Marcela de SOUZA ◽  
Annelise Kopp ALVES ◽  
Susana Maria Werner SAMUEL ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Visible Light ◽  
Dental Bleaching ◽  
Titanium Dioxide Photocatalysis

scholarly journals From micro to macro-contaminants: The impact of low-energy titanium dioxide photocatalysis followed by filtration on the mitigation of drinking water organics

Chemosphere ◽  
2019 ◽  
Vol 217 ◽  
pp. 111-121 ◽  
Author(s):  
Brooke K. Mayer ◽  
Carlan Johnson ◽  
Yu Yang ◽  
Nicole Wellenstein ◽  
Emily Maher ◽  
...  
Keyword(s):  
Drinking Water ◽  
Titanium Dioxide ◽  
Low Energy ◽  
Titanium Dioxide Photocatalysis ◽  
The Impact

Effect of the calcination temperature on the photocatalytic efficiency of acidic sol–gel synthesized TiO2nanoparticles in the degradation of alprazolam

2017 ◽  
Vol 16 (6) ◽  
pp. 935-945 ◽  
Author(s):  
Andreia Romeiro ◽  
Diana Freitas ◽  
M. Emília Azenha ◽  
Moisés Canle ◽  
Hugh D. Burrows
Keyword(s):  
Aqueous Solution ◽  
Titanium Dioxide ◽  
Calcination Temperature ◽  
Sol Gel ◽  
Psychoactive Drug ◽  
Photocatalytic Efficiency ◽  
Titanium Dioxide Photocatalysis

The benzodiazepine psychoactive drug alprazolam is efficiently photodegraded and mineralized in aqueous solution using titanium dioxide photocatalysis.

Degradation of Phenol in Water by Titanium Dioxide Photocatalysis

2013 ◽  
Vol 29 (03) ◽  
pp. 1055-1060 ◽  
Author(s):  
NOUREDDINE BARKA ◽  
IDRISS BAKAS ◽  
SAMIR QOURZAL ◽  
ALI ASSABBANE AND YHYA AIT-ICHOU
Keyword(s):  
Titanium Dioxide ◽  
Titanium Dioxide Photocatalysis

scholarly journals Contamination of Trichloroethylene in Drinking Water System and Its Degradation

2012 ◽  
Vol 3 ◽  
pp. 13-17 ◽  
Author(s):  
Devi Lal Adhikari ◽  
Chikashi Sato ◽  
Shobha Kanta Lamichhane
Keyword(s):  
Drinking Water ◽  
Titanium Dioxide ◽  
Ultraviolet Light ◽  
Water System ◽  
Ultrasonic Waves ◽  
Produce Water ◽  
Drinking Water Standard ◽  
Drinking Water System ◽  
Flow Through ◽  
System Water

Photolysis and sonolysis of trichloroethylene (TCE) in water was investigated using a cup-horn, flow-through reactor system. Water containing titanium dioxide was deliberately contaminated with TCE. These solutions were irradiated with ultraviolet light (UV) and ultrasonic waves (US). The decrease in the TCE concentration was observed in water under both US and UV treatments. Present findings declare that the use of UV and US decreased the TCE concentration. With the reactor specifications used, the photolysis and sonolysis processes can produce water meeting the drinking water standard (MCLs of 5?g/L) for TCE.The Himalayan PhysicsVol. 3, No. 32012Page : 13-17

scholarly journals TiO2-assisted photodegradation of pharmaceuticals — a review

2012 ◽  
Vol 10 (4) ◽  
pp. 989-1027 ◽  
Author(s):  
Alfred Tong ◽  
Rhiannon Braund ◽  
David Warren ◽  
Barrie Peake
Keyword(s):  
Titanium Dioxide ◽  
Advanced Oxidation Process ◽  
Treatment Time ◽  
Sewage Treatment ◽  
Advanced Oxidation ◽  
Careful Consideration ◽  
Experimental Conditions ◽  
Wastewater Treatment Process ◽  
Titanium Dioxide Photocatalysis ◽  
Degradation Rates

AbstractPharmaceutical compounds have been detected in the environment and potentially arise from the discharge of excreted and improperly disposed medication from sewage treatment facilities. In order to minimize environmental exposure of pharmaceutical residues, a potential technique to remove pharmaceuticals from water is the use of an advanced oxidation process (AOP) involving titanium dioxide (TiO2) photocatalysis. To evaluate the extent UV/TiO2 processes have been studied for pharmaceutical degradation, a literature search using the keywords ‘titanium dioxide’, ‘photocatalysis’, ‘advanced oxidation processes’, ‘pharmaceuticals’ and ‘degradation’ were used in the ISI Web of Knowledge TM, Scopus TM and ScienceDirect TM databases up to and including articles published on 23 November 2011. The degradation rates of pharmaceuticals under UV/TiO2 treatment were dependent on type and amount of TiO2 loading, pharmaceutical concentration, the presence of electron acceptors and pH. Complete mineralization under particular experimental conditions were reported for some pharmaceuticals; however, some experiments reported evolution of toxic intermediates during the photocatalytic process. It is concluded that the UV/TiO2 system is potentially a feasible wastewater treatment process, but careful consideration of the treatment time, the loading and the type of TiO2 (doped vs. undoped) used for a particular pharmaceutical is necessary for a successful application (198 words).

scholarly journals Use of Titanium Dioxide Photocatalysis on the Remediation of Model Textile Wastewaters Containing Azo Dyes

Molecules ◽  
2011 ◽  
Vol 16 (12) ◽  
pp. 10370-10386 ◽  
Author(s):  
Enrico Mendes Saggioro ◽  
Anabela Sousa Oliveira ◽  
Thelma Pavesi ◽  
Cátia Gil Maia ◽  
Luis Filipe Vieira Ferreira ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Azo Dyes ◽  
Titanium Dioxide Photocatalysis ◽  
Textile Wastewaters
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