scholarly journals Photocatalytic Oxidation of Gaseous Benzene under 185 nm UV Irradiation

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Haibao Huang ◽  
Xinguo Ye ◽  
Huiling Huang ◽  
Peng Hu ◽  
Lu Zhang ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Uv Irradiation ◽  
Photocatalytic Oxidation ◽  
Air Pollutant ◽  
Benzene Oxidation ◽  
Human Being ◽  
Benzene Removal ◽  
Uv Lamps ◽  
Gaseous Benzene ◽  
Great Harm

Benzene is a toxic air pollutant and causes great harm to human being. Photocatalytic oxidation (PCO) has been frequently studied for benzene removal, however, its PCO efficiency is still very low and the photocatalysts are easy to be deactivated. To improve the efficiency and stability of PCO, UV lamps with partial 185 nm UV irradiation were used to activate photocatalysts (denoted as 185-PCO). Cobalt modified TiO2(Co-TiO2) was developed to improve the PCO activity and eliminate ozone generated from 185 nm UV irradiation. Results show that benzene removal efficiency of PCO with 254 nm UV irradiation (denoted as 254-PCO) is only 2.1% while it was greatly increased to 51.5% in 185-PCO. 185-PCO exhibited superior capacity for benzene oxidation. In the 185-PCO process, much ozone was left in case of TiO2as photocatalysts while it can be nearly eliminated by 1% Co-TiO2.

Photoelectrochemical Degradation of Procion Red MX-5B in TiO2 Suspension Using Na2SO4 as Electrolyte

2010 ◽  
Vol 26-28 ◽  
pp. 637-640
Author(s):  
Wen Jie Zhang ◽  
Ru Yuan Li ◽  
Jia Wei Bai
Keyword(s):  
Reaction Time ◽  
Removal Efficiency ◽  
Uv Irradiation ◽  
Photocatalytic Oxidation ◽  
Electrolyte Concentration ◽  
Dye Decolorization ◽  
Applied Potential ◽  
Toc Removal ◽  
Prolonged Reaction Time

Photoelectrochemical (PEC) degradation of Procion Red MX-5B was investigated in aqueous Na2SO4 solution. Higher electrolyte concentration resulted in higher current between the electrodes due to increased conductivities of the solutions. UV irradiation could obviously raise the current, and the differences became larger in accordance with the increase of the applied potentials. The pH declined in the first 30 minutes and became constant for the prolonged reaction time during both PEC degradation and photocatalytic oxidation. The applied potential could only slightly improve dye decolorization. Although a potential of 8 V was applied to 0.3 mol/l Na2SO4 solution, TOC removal efficiency of PEC degradation was almost as the same as that of photocatalytic oxidation.

scholarly journals Factors Determining the Removal Efficiency of Procion MX in Waters Using Titanate Nanotubes Catalyzed by UV Irradiation

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Vo Nguyen Xuan Que ◽  
Tran Tien Khoi ◽  
Nguyen Thi Thuy ◽  
Ta Thi Minh Dung ◽  
Dao Thi Thanh Binh ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Uv Irradiation ◽  
Textile Industry ◽  
Photocatalytic Oxidation ◽  
Organic Dyes ◽  
Treatment Method ◽  
Titanate Nanotubes ◽  
Efficient Treatment ◽  
Ph Variation ◽  
Set Up

The treatment of wastewater from the textile industry containing organic dyes faces many challenges since these compounds resist the biodegradation process in conventional treatment units. Among the physicochemical processes, photocatalysis is considered a facile, cheap, and environmental-friendly technology for treating persistent organic pollutants in waters at low concentrations. This study investigated several physicochemical factors determining the photocatalytic activity of titanate nanotubes (TNTs) to remove Procion MX 032 (PMX), an azo dye, in waters. Degradation of PMX by photocatalytic oxidation process at room temperature (30°C) was set up with the UV irradiation in the presence of different types of photocatalyst such as ST-01 (100% anatase), industrial TiO2, TNTs calcined at 120°C and 500°C. Effect of reaction time, catalyst amount, pH, light wavelength and intensity, and oxidants was investigated. Consequently, TNTs calcined at 500°C provided the highest removal efficiency. The photocatalytic oxidation of PMX by TNT calcined at 500°C was affected by pH variation, getting the highest removal at pH of 8, and inhibited with the presence of H2O2 and O2. Particularly, the PMX degradation using titanate nanotubes was optimized under the UV-A intensity of 100 W/m2. The dye was degraded by more than 95% at the TNTs concentration of 75 mg/L and pH 8.0 after 90 min. The results suggest that photocatalysis using TNTs can be a simple but efficient treatment method to remove PMX and potentially be applied for the treatment of wastewaters containing dyes.

scholarly journals Photocatalytic disinfection of water polluted by Pseudomonas Aeruginosa

2013 ◽  
Vol 9 (2) ◽  
pp. 132-136
Keyword(s):  
Cell Wall ◽  
Ascorbic Acid ◽  
Removal Efficiency ◽  
Uv Irradiation ◽  
Photocatalytic Oxidation ◽  
Irradiation Time ◽  
Cell Mass ◽  
Treatment Method ◽  
Inhibitory Effect ◽  
Intact Cells

Photocatalysis by titanium dioxide (TiO2) is a water treatment method. Pseudomonas aeruginosa is a microorganism resistant to chlorine and UV-C irradiation. TiO2 photocatalytic technology can destroy bacteria, which are resistant to oxidative destruction of cell membrane caused by sole UV irradiation. This study aims to investigate the total mineralization of the bacterium (P. aeruginosa) to the extent of death and cell-mass destruction using TiO2 photocatalytic oxidation process. In this work the effects of parameters such as amount of TiO2, irradiation time, initial concentration of bacterium, presence of ascorbic acid and effect of cell wall on removal of P. aeruginosa were studied. The data, which were obtained in this study, showed that the optimum concentration of TiO2 was 325 ppm. Also at the initial concentration of TiO2 equal to 325 ppm and initial microorganism MPN / 100 ml equal to 300 and after 75 min UV irradiation time, P. aeruginosa removal efficiency was 94.3 %. Removal efficiency of P. aeruginosa in the absence of TiO2 or UV irradiation was very low. Decreasing the concentration of microorganisms increased its removal efficiency. Removal efficiency of spheroplast cells was more than intact cells of P. aeruginosa, which shows the important role of cell wall on cell resistance against chemical agents. Ascorbic acid had inhibitory effect on this process.

Photocatalytic oxidation of aquatic humic substances using TiO2/UV in a rotating photoreactor

2006 ◽  
Vol 6 (2) ◽  
pp. 93-99
Author(s):  
I. Han ◽  
J.W. Shin ◽  
H.C. Kim
Keyword(s):  
Humic Substances ◽  
Uv Irradiation ◽  
Photocatalytic Oxidation ◽  
Tio2 Photocatalysts ◽  
Photocatalytic Reactor ◽  
Han River ◽  
Humic Materials ◽  
Air Blowing ◽  
Ft Ir ◽  
Uv Lamps

Applicability of a rotating reactor for photocatalytic oxidation of humic substances extracted from the Han River in Seoul, Korea (Han-HS) was investigated. Because air blowing for complete dispersion of TiO2 photocatalysts could inhibit ultraviolet (UV)-irradiation between UV lamps and photocatalysts by air bubbles, a rotating photocatalytic reactor with four baffles was used for better UV-irradiation in this study. Han-HS was extracted and treated with UV-irradiation. Because Han-HS is different from other commercial humic materials (e.g. Aldrich Humic acid and International Humic Substance Society NOM), structural spectroscopic analyses were conducted by FT-IR and 13C-NMR. Immobilized TiO2 coated on hollow beads was used to separate and recover the photocatalyst. During two hours of UV-irradiation, absorbance at 254 nm (UV254) and total organic carbon (TOC) content were monitored. Photocatalytic oxidation efficiencies of different wavelengths of UV lamps (254 nm and 352 nm) were also compared and raw and pre-chlorinated waters of the Han River were used to evaluate the applicability for water treatment.

A near-infrared fluorescent probe targeting mitochondria for sulfite detection and its application in food and biology

2021 ◽  
Author(s):  
Jianbin Chao ◽  
Zhuo Wang ◽  
Yongbin Zhang ◽  
Fangjun Huo ◽  
Caixia Yin
Keyword(s):  
Cardiovascular Diseases ◽  
Sulfur Dioxide ◽  
Human Health ◽  
Fluorescent Probe ◽  
Respiratory Diseases ◽  
Near Infrared ◽  
Air Pollutant ◽  
Great Harm

Abstract: Sulfur dioxide (SO2) is the main air pollutant in the environment, causing great harm to human health. Abnormal SO2 levels are usually associated with some respiratory diseases, cardiovascular diseases,...

A combined multistage corona discharge and catalytic system for gaseous benzene removal

2007 ◽  
Vol 263 (1-2) ◽  
pp. 128-136 ◽  
Author(s):  
Sumaeth Chavadej ◽  
Witan Kiatubolpaiboon ◽  
Pramoch Rangsunvigit ◽  
Thammanoon Sreethawong
Keyword(s):  
Corona Discharge ◽  
Catalytic System ◽  
Benzene Removal ◽  
Gaseous Benzene

Synthesis and Characterization of TiO2/YFeO3 and Its Photocatalytic Oxidation of Gaseous Benzene

2008 ◽  
Vol 24 (10) ◽  
pp. 1761-1766 ◽  
Author(s):  
W WANG ◽  
S LI ◽  
Y WEN ◽  
M GONG ◽  
L ZHANG ◽  
...  
Keyword(s):  
Photocatalytic Oxidation ◽  
Synthesis And Characterization ◽  
Gaseous Benzene

Benzene Removal in Laboratory Scale Model Wetland under Different Electron Acceptor Conditions Treating Sulfate-Rich Wastewater

2014 ◽  
Vol 955-959 ◽  
pp. 2083-2086 ◽  
Author(s):  
Zhong Bing Chen ◽  
Uwe Kappelmeyer ◽  
Peter Kuschk
Keyword(s):  
Sulfate Reduction ◽  
Removal Efficiency ◽  
Constructed Wetlands ◽  
Electron Acceptor ◽  
Scale Model ◽  
Treatment Performance ◽  
Sulfide Toxicity ◽  
Benzene Concentration ◽  
Benzene Removal ◽  
High Sulfate

Constructed wetlands (CWs) are shown to be suitable for the treatment of water contaminated with benzene. However, due to the high sulfate concentration (around 850 mg/L) in influent, sulfate reduction will be stimulated in CWs. Subsequently, the toxicity of sulfide will be a catastrophe to the plants, and the treatment performance of CWs will be impaired. In this study, nitrite and nitrate were used as competitor with sulfate for electron acceptor to prevent the sulfate reduction. With the inflow benzene concentration ranged from 21.6-103 μg, and the accumulation of sulfide reached up to 39%, the removal efficiency of benzene decreased from 86% to 27%. However, with the addition of nitrite and nitrate, the sulfide accumulation was inhibited successfully, and the benzene removal efficiency recovered to 85%. In conclusion, both nitrite and nitrate can be an option for preventing sulfate reduction and sulfide toxicity in CWs treating sulfate-rich wastewater.

scholarly journals Evaluation of Malathion Pesticide Removal Efficiency by g-C3N4/ Fe3O4/Ag Nanocomposites from Aqueous Solutions in the Presence of UV Irradiation

2020 ◽  
Vol 7 (3) ◽  
pp. 261-279
Author(s):  
Ali Esrafili ◽  
Soudabeh Ghodsi ◽  
Roshanak Rezaei Kalantary ◽  
Mitra Gholami ◽  
◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Removal Efficiency ◽  
Uv Irradiation ◽  
Pesticide Removal

Photocatalytic Oxidation of Gaseous Benzene under VUV Irradiation over TiO 2 /Zeolites Catalysts

2017 ◽  
Vol 281 ◽  
pp. 649-655 ◽  
Author(s):  
Haibao Huang ◽  
Gaoyuan Liu ◽  
Yujie Zhan ◽  
Ying Xu ◽  
Haoxian Lu ◽  
...  
Keyword(s):  
Photocatalytic Oxidation ◽  
Gaseous Benzene
Sign in / Sign up

Export Citation Format

Share Document