TiO2 nanotube photocatalytic oxidation for water treatment

2009 ◽  
Vol 9 (1) ◽  
pp. 45-49 ◽  
Author(s):  
Xiwang Zhang ◽  
Jia Hong Pan ◽  
Weijiong Fu ◽  
Alan Jiahong Du ◽  
Darren D Sun
Keyword(s):  
Tio2 Nanotubes ◽  
Membrane Filtration ◽  
Photocatalytic Oxidation ◽  
Catalyst Deactivation ◽  
Batch Reactor ◽  
Heterogeneous Photocatalysis ◽  
Excellent Performance ◽  
One Dimensional ◽  
Current Water ◽  
Commercial Tio2

Heterogeneous photocatalysis is a promising technology in addressing the incapability of current water technology. In this present paper, we proposed the fabrication of one-dimensional TiO2 nanotubes through hydrothermal method. Various techniques were used to characterize the nanotubes, i.e. FESEM, HRTEM, XRD and BET. Subsequently, the evaluation of photocatalytic oxidative (PCO) properties of TiO2 nanotubes are compared with the commercial TiO2 P25 (i.e. TiO2 powder) in PCO batch reactor. The TiO2 nanotubes show excellent performance with complete photodegradation of humic acid (HA) in comparison with the 97.7% removal efficiency of P25. The TiO2 nanotubes are also tested in membrane filtration for verification of catalyst separation and recovery. The TiO2 nanotubes were totally separated and recovered with membrane filtration. Lastly, its stability is tested in repeated reuse experiments. No catalyst deactivation is observed after five consecutive PCO experiments of newly added HA. Therefore, our novel nanostructured photoctalyst is an advancement in photocatalytic technology that has significant impact for current water technology.

Removal of color substances using photocatalytic oxidation for membrane filtration processes

2001 ◽  
Vol 43 (10) ◽  
pp. 319-325 ◽  
Author(s):  
J. H. Tay ◽  
D. Chen ◽  
D. D. Sun
Keyword(s):  
Hydrogen Peroxide ◽  
Membrane Filtration ◽  
Photocatalytic Oxidation ◽  
Removal Rate ◽  
Membrane Surface ◽  
Rejection Rate ◽  
Solution Treated ◽  
Low Concentrations ◽  
Photo Catalytic Oxidation ◽  
Positive Effect

This study aims to remove the color substances, which normally cause difficulties in membrane filtration processes due to fouling using heterogeneous UV/TiO2/H2O2 reactor. It is confirmed that the technique used in this study was effective to remove TOC at 38% and color400 at 89% within 150-min irradiation. The experiment results showed that low concentrations of hydrogen peroxide dosage (less than 0.016 M) to UV/TiO2 system accelerated the TOC and Color400 removal rate from 9% to 38% and 40% to 89% respectively, while over-dosage made this positive effect decline. The humic acid solution treated by photo catalytic oxidation in UV/TiO2/H2O2 reactor did not change the zeta potential on membrane surface and membrane rejection rate.

scholarly journals Treatment of Polyaniline Wastewater by Coupling of Photoelectro-Fenton and Heterogeneous Photocatalysis with Black TiO2 Nanotubes

ACS Omega ◽  
2019 ◽  
Vol 4 (6) ◽  
pp. 9664-9672 ◽  
Author(s):  
Bin Ou ◽  
Jixiao Wang ◽  
Ying Wu ◽  
Song Zhao ◽  
Zhi Wang
Keyword(s):  
Tio2 Nanotubes ◽  
Heterogeneous Photocatalysis ◽  
Black Tio2

scholarly journals Degradation of Direct Blue 1 through Heterogeneous Photocatalysis with TiO2 Irradiated with E-Beam

Processes ◽  
2020 ◽  
Vol 8 (9) ◽  
pp. 1181
Author(s):  
Elvia Gallegos ◽  
Florinella Muñoz Bisesti ◽  
Katherine Vaca-Escobar ◽  
Cristian Santacruz ◽  
Lenys Fernández ◽  
...  
Keyword(s):  
Rate Constant ◽  
Textile Industry ◽  
Adsorption Process ◽  
Batch Reactor ◽  
Degradation Process ◽  
Heterogeneous Photocatalysis ◽  
Photodegradation Rate ◽  
Direct Blue ◽  
Degradation Rate Constant ◽  
Different Doses

Most dyes used in the textile industry are chemically stable and poorly biodegradable, therefore, they are persistent in the environment and difficult to degrade by conventional methods. An alternative treatment for this kind of substance is heterogeneous photocatalysis using TiO2, so, in this work, it is proposed to degrade Direct Blue 1 (DB1) using microparticulate TiO2 irradiated with e-beam at three different doses: 5, 10 and 20 kGy (J/kg). The DB1 degradation was implemented in a batch reactor (DB1 initial concentration = 50 mg L−1, pH 2.5, TiO2 concentration = 200 mg L−1). We have demonstrated that the photocatalytic power of TiO2, when irradiated with e-beam (5, 10, 20 kGy), varies slightly, with minor effects on photodegradation performance. However, the dose of 10 kGy showed a slightly better result, according to the DB1 photodegradation rate constant. Adsorption process was not affected by irradiation; its isotherm was fitted to Freundlich’s mathematical model. The DB1 photodegradation rate constants, after one hour of treatment, were: 0.0661 and 0.0742 min−1 for irradiated (10 kGy) and nonirradiated TiO2, respectively. The degradation rate constant has an increase of 12.3% for irradiated TiO2. Finally, there was no evidence of mineralization in the degradation process after 60 min of treatment. According to the results, the irradiation of microparticulate TiO2 with e-beam (10 kGy) slightly improves the photodegradation rate constant of DB1.

Mechanism investigation on the enhanced photocatalytic oxidation of nonylphenol on hydrophobic TiO2 nanotubes

2020 ◽  
Vol 382 ◽  
pp. 121017 ◽  
Author(s):  
Chunjing Tang ◽  
Xuerong Huang ◽  
Haoying Wang ◽  
Huijie Shi ◽  
Guohua Zhao
Keyword(s):  
Tio2 Nanotubes ◽  
Photocatalytic Oxidation

scholarly journals Photocatalytic Oxidation of VOCs in Gas Phase Using Capillary Microreactors with Commercial TiO2 (P25) Fillings

Materials ◽  
2018 ◽  
Vol 11 (7) ◽  
pp. 1149 ◽  
Author(s):  
Javier Fernández-Catalá ◽  
Ángel Berenguer-Murcia ◽  
Diego Cazorla-Amorós
Keyword(s):  
Gas Phase ◽  
Photocatalytic Oxidation ◽  
Commercial Tio2

Monodisperse Ag–AgBr nanocrystals anchored on one-dimensional TiO2 nanotubes with efficient plasmon-assisted photocatalytic performance

RSC Advances ◽  
2016 ◽  
Vol 6 (73) ◽  
pp. 68653-68662 ◽  
Author(s):  
Chao Xue ◽  
Xiaoqing Yan ◽  
Shujiang Ding ◽  
Guidong Yang
Keyword(s):  
Organic Pollutants ◽  
Tio2 Nanotubes ◽  
High Performance ◽  
Photocatalytic Performance ◽  
One Dimensional ◽  
Very High

A novel ternary Ag–AgBr/TiO2 plasmonic nanotube heterojunction photocatalyst was fabricated, showing a very high-performance for decomposition of organic pollutants.

Enhancement of membrane filtration ability by pretreatment of secondary effluent using a new photocatalytic oxidation system

2009 ◽  
Vol 6 (1-3) ◽  
pp. 184-189
Author(s):  
Ren-Yang Horng ◽  
Chih-Pin Huang ◽  
Min-Chao Chang ◽  
Hsin Shao ◽  
Mathias Ernst ◽  
...  
Keyword(s):  
Membrane Filtration ◽  
Photocatalytic Oxidation ◽  
Secondary Effluent ◽  
Oxidation System
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