Photocatalytic decomposition on nano-TiO2: Destruction of chloroaromatic compounds

Lu, Shengyong; Wu, Di; Wang, Qiulin; Yan, Jun; Buekens, Alfons; Cen, Kefa

doi:10.1016/j.chemosphere.2010.12.034

Cited by 128 publications

(62 citation statements)

References 63 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Fe/Ni bimetallic nanoparticles have also been effective toward the remediation of other organohalides including pentachlorophenol [141] , monochlorobenzene [142] , brominated diphenyl ethers [102] , TCE [11] , carbon tetrachloride [143] , chloroform [143] , and brominated methanes [94] .…”

Section: Iron/nickel Bimetallic Nanoparticlesmentioning

confidence: 99%

Nanoscale materials for organohalide degradation via reduction pathways

Bolandi

Nick

Obare

2012

Nanotechnology Reviews

View full text Add to dashboard Cite

The unique chemical and physical properties of nanoscale materials have led to important roles in several scientifi c and technological fi elds. Environmental chemistry processes have benefi ted from the enhanced reactivity of nanoscale particles relative to their bulk counterparts with contaminants. Here, we describe recent advances in the synthesis and characterization of metallic and bimetallic nanoparticles that have been effective toward degrading toxic organohalide contaminants. We then review the degradation mechanisms involved in the reactions of nanoscale particles with organohalides via reduction pathways. We also discuss an emerging area -the degradation of organohalides via multi-electron transfer pathways.

show abstract

Section: Iron/nickel Bimetallic Nanoparticlesmentioning

confidence: 99%

Nanoscale materials for organohalide degradation via reduction pathways

Bolandi

Nick

Obare

2012

Nanotechnology Reviews

View full text Add to dashboard Cite

show abstract

“…Photocatalysis decomposes air pollutants such as acetaldehyde (Asahi et al, 2001;Huang et al, 2009;Li et al, 2012) and refractory dioxins (Lu et al, 2011;Daikoku, 2015;Vallejo et al, 2015). Although incomplete photocatalysis of VOCs may possibly generate intermediate compounds, photocatalytic oxidation can be applied to clean indoor air polluted with VOCs (Zhao and Yang, 2003;Hodgson et al, 2007;Mo et al, 2009;Tseng et al, 2010;Huang et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Improved Photocatalytic Air Cleaner with Decomposition of Aldehyde and Aerosol-Associated Influenza Virus Infectivity in Indoor Air

Shiraki

Yamada

Yoshida

et al. 2017

Aerosol Air Qual. Res.

View full text Add to dashboard Cite

Air pollution caused by fine particulate matter (PM 2.5 ), volatile organic compounds, and bioaerosols is a major environmental risk to health. We developed a photocatalytic air cleaner for reducing the pollution levels of indoor air; we improved the photocatalytic system by using UV-LED for the removal of acetaldehyde and PM 2.5 and by reducing the weight and size of the system. The efficiency of photocatalysis depends on the surface area and materials. Therefore, we prepared a nanosized titanium dioxide (TiO 2 )-coated aluminum plate irradiated by UV-LED lamps (wavelength: 375 nm) as a photocatalytic air cleaner. Passing air continuously through a TiO 2 -coated aluminum plate (5 × 10 × 1 cm) under black light for 200 min decomposed 90% of 5 ppm acetaldehyde (12.4 µmol h -1 ) and generated two carbon dioxide molecules (25.43 µmol h -1 ) at a molar ratio of 1:2, indicating complete decomposition of acetaldehyde with high efficiency. This photocatalytic air cleaner was applied to the decomposition of acetaldehyde and inactivation and removal of aerosolassociated influenza virus. Acetaldehyde (20 ppm) in a 1-m 3 cubic space was eliminated in 60 min at a half-life of 8 min. The aerosol-associated infectivity and the RNA genome of influenza virus A/PR/8/1934 (H1N1) produced by a nebulizer in a 779-L cubic space were eliminated within 7 min; however, they were detectable for up to 28 minutes when the functional photocatalytic air cleaner was not used. The presence of intermediate breakdown products of influenza virus indicated that the virus was broken down by photocatalysis. Thus, the photocatalytic air cleaner efficiently decomposed and eliminated organic chemicals, acetaldehyde, and aerosol-associated influenza virus infectivity and viral RNA, indicating that it can clean and detoxify the indoor air in a closed space for maintaining a safer environment.

show abstract

“…The use of TiO 2 nanoparticles has some limitations which are caused by the wide band gap between the valence and conduction bands (Eg > 3.2 eV, λ < 388 nm), that can only absorb UV light [2], so a modification of TiO 2 structure is necessary. One of the modifications is doping other atoms and ions (such as sulfur and nitrogen) to the titanium structure [3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…This method has been developed to degrade organic and inorganic pollutants into nontoxic species (e.g. CO 2 , H 2 O, etc. ).…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic degradation of crystal violet by thiourea-doped TiO2 thin film fixed bed photoreactors under visible irradiation: Optimisation using central composite designs and kinetics studies by multivariate curve resolution

Khalilian¹,

Semnani²,

Nekoeinia³

2018

Bull. Chem. Soc. Eth.

View full text Add to dashboard Cite

ABSTRACT. In this study, optimisation of the photocatalytic behaviour of crystal violet (CV) by thiourea (Tu)-codoped TiO2 thin film in fixed bed photoreactor was investigated by central composite designs (CCDs). The effective variables were pH, the concentration of CV dye, flow rate and reaction time. The results of the CCD model showed a good agreement with experimental results, with R 2 = 0.9680 (p < 0.0001) and maximum degradation efficiency was obtained at the optimum conditions: dye concentration 8.5 mg/L, pH 9, flow rate 6 mL/min and reaction time 80 min. Subsequently, three absorbing chemical compounds presented in the degradation reaction were obtained by using singular value decomposition (SVD) method and evolving factor analysis (EFA). Then a multivariate curve resolution with alternating least squares (MCR-ALS) was performed to achieve the concentration and spectral profiles for each component. Finally, a hard modelling method was applied to determine the kinetic constants of distinct reactions occurred in the photocatalytic degradation process. The reaction rate constants were calculated for the first and second steps as k1 = 0.08327 (SD = ±0.0015) /min and k2 = 0.045 (SD = ±0.0006)/min, respectively.

show abstract

Photocatalytic decomposition on nano-TiO2: Destruction of chloroaromatic compounds

Cited by 128 publications

References 63 publications

Nanoscale materials for organohalide degradation via reduction pathways

Nanoscale materials for organohalide degradation via reduction pathways

Improved Photocatalytic Air Cleaner with Decomposition of Aldehyde and Aerosol-Associated Influenza Virus Infectivity in Indoor Air

Photocatalytic degradation of crystal violet by thiourea-doped TiO2 thin film fixed bed photoreactors under visible irradiation: Optimisation using central composite designs and kinetics studies by multivariate curve resolution

Contact Info

Product

Resources

About