Photochemical Decomposition of Environmentally Persistent Perfluorooctanoic Acid in Water

2006 ◽  
Vol 1 (3) ◽  
Author(s):  
Zhang Chaojie ◽  
Zhou Qi ◽  
Chen Ling ◽  
Yuan Yuan ◽  
Zhang Qian
Keyword(s):  
Ph Value ◽  
Uv Light ◽  
Bond Cleavage ◽  
Perfluorooctanoic Acid ◽  
Effective Technique ◽  
Photo Degradation ◽  
Factors Affecting ◽  
Uv Light Irradiation ◽  
Photochemical Decomposition ◽  
Zero Order Reaction

The photo-degradation of perfluorooctanoic acid (PFOA) in aqueous solution was preliminarily studied in this paper in order to develop an effective technique against the pollution of PFOA. Reaction kinetics and factors affecting the degradation were investigated. The results showed that PFOA could be degraded effectively into fluorine ion through UV light irradiation, which was the first example of C-F bond cleavage in PFOA induced by UV light; Ferric ion could promote the photo-degradation efficiency of PFOA in aqueous solutions at pH value 4.0, while adding TiO2 could not increase this photochemical reaction under our experimental condition; The dynamics analysis showed that photodecomposition of PFOA followed a pseudo-zero order reaction. The study indicated that photochemical decomposition was a highly promising technology for the removal of PFOA from wastewater.

Photochemical decomposition of perfluorooctanoic acid in aqueous periodate with VUV and UV light irradiation

2010 ◽  
Vol 179 (1-3) ◽  
pp. 1143-1146 ◽  
Author(s):  
M.H. Cao ◽  
B.B. Wang ◽  
H.S. Yu ◽  
L.L. Wang ◽  
S.H. Yuan ◽  
...  
Keyword(s):  
Uv Light ◽  
Perfluorooctanoic Acid ◽  
Light Irradiation ◽  
Uv Light Irradiation ◽  
Photochemical Decomposition

scholarly journals Excellent UV-Light Triggered Photocatalytic Performance of ZnO.SiO2 Nanocomposite for Water Pollutant Compound Methyl Orange Dye

Nanomaterials ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 2548
Author(s):  
Sunil Rohilla ◽  
Ankita Gupta ◽  
Vibhor Kumar ◽  
Suman Kumari ◽  
Michal Petru ◽  
...  
Keyword(s):  
Methyl Orange ◽  
Ph Value ◽  
Uv Light ◽  
Irradiation Time ◽  
Diffraction Method ◽  
Hexagonal Structure ◽  
Precipitation Method ◽  
Photo Degradation ◽  
Systematic Analysis ◽  
Degradation Ability

The photocatalytic activity of eco-friendly zinc oxide doped silica nanocomposites, synthesized via a co-precipitation method followed by heat-treatment at 300, 600, and 900 °C is investigated. The samples have been characterized by employing X-ray diffraction method, and further analyzed using the Rietveld Refinement method. The samples show a space group P63mc with hexagonal structure. The prepared composites are tested for their photocatalytic activities for the degradation of methyl orange-based water pollutants under ultra-violet (UV) irradiation using a 125 W mercury lamp. A systematic analysis of parameters such as the irradiation time, pH value, annealing temperatures, and the concentration of sodium hydroxide impacting the degradation of the methyl orange (MO) is carried out using UV-visible spectroscopy. The ZnO.SiO2 nanocomposite annealed at 300 °C at a pH value of seven shows a maximum photo-degradation ability (~98.1%) towards methyl orange, while the photo-degradation ability of ZnO.SiO2 nanocomposites decreases with annealing temperature (i.e., for 600 and 900 °C) due to the aspect ratio. Moreover, it is seen that with increment in the concentration of the NaOH (i.e., from 1 to 3 g), the photo-degradation of the dye component is enhanced from 20.9 to 53.8%, whereas a reverse trend of degradation ability is observed for higher concentrations.

Photocatalytic alkene reduction by a B12–TiO2 hybrid catalyst coupled with C–F bond cleavage for gem-difluoroolefin synthesis

2017 ◽  
Vol 53 (68) ◽  
pp. 9478-9481 ◽  
Author(s):  
Hui Tian ◽  
Hisashi Shimakoshi ◽  
Kenji Imamura ◽  
Yoshihito Shiota ◽  
Kazunari Yoshizawa ◽  
...  
Keyword(s):  
Uv Light ◽  
Bond Cleavage ◽  
Light Irradiation ◽  
Hybrid Catalyst ◽  
Uv Light Irradiation

B12–TiO2 hybrid catalyzed CC bond reduction coupled with C–F bond cleavage under UV light irradiation is reported.

Kinetic and thermodynamic study of the adsorption of calcium onto sugar beet pulp

2016 ◽  
pp. 565-570
Author(s):  
Huang Qin ◽  
Zhu Si-ming ◽  
Zeng Di ◽  
Yu Shu-juan
Keyword(s):  
Sugar Beet ◽  
Adsorption Equilibrium ◽  
Ph Value ◽  
Hard Water ◽  
Sugar Beet Pulp ◽  
Order Kinetic ◽  
Factors Affecting ◽  
Isotherm Equation ◽  
Equilibrium Data ◽  
Beet Pulp

Sugar beet pulp (SBP) was used as low value adsorbent for the removal of calcium from hard water. Batch experiments were conducted to determine the factors affecting adsorption of the process such as pH value and Ca concentration. The adsorption equilibrium of Ca2+ by the SBP is reached after 100min and a pseudo second-order kinetic model can describe the adsorption process. The initial concentrations of Ca varied from 927 to 1127mgCa2+/L. A dose of 30g/L sugar beet pulp was sufficient for the optimum removal of calcium. The overall uptake of Ca ions by sugar beet pulp has its maximum at pH=8. The adsorption equilibrium data fitted well with the Langmuir adsorption isotherm equation.

Synthesis, crystal structure, luminescence, and photocatalytic properties of a 2D Cu(II) metal-organic frameworks based on 3,5-di(1H-benzimidazol-1-yl)pyridine and 4,4′-oxybis(benzoate) ligands

2020 ◽  
Vol 75 (8) ◽  
pp. 727-732
Author(s):  
Chen Zhang ◽  
Jian-Qing Tao
Keyword(s):  
Crystal Structure ◽  
Thermal Analysis ◽  
Uv Light ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
X Ray Diffraction ◽  
X Ray ◽  
Uv Light Irradiation ◽  
Photocatalytic Activities ◽  
Metal Organic

AbstractA new Cu(II) metal-organic framework, [Cu(L)(OBA)·H2O]n (1) [H2OBA = 4,4′-oxybis(benzoic acid), L = 3,5-di(1H-benzimidazol-1-yl)pyridine] was hydrothermally synthesized and characterized through IR spectroscopy, elemental and thermal analysis and single-crystal X-ray diffraction. Complex 1 is a four-connected uni-nodal 2D net with a (44·62) topology which shows an emission centered at λ ∼393 nm upon excitation at λ = 245 nm. Moreover, complex 1 possesses high photocatalytic activities for the decomposition of Rhodamine B (RhB) under UV light irradiation.

scholarly journals TiO2-Powdered Activated Carbon (TiO2/PAC) for Removal and Photocatalytic Properties of 2-Methylisoborneol (2-MIB) in Water

Water ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 1622
Author(s):  
Xiao-Pin Guo ◽  
Peng Zang ◽  
Yong-Mei Li ◽  
Dong-Su Bi
Keyword(s):  
Activated Carbon ◽  
Natural Organic Matter ◽  
Uv Light ◽  
Sol Gel ◽  
Light Irradiation ◽  
Nano Tio2 ◽  
Uv Light Irradiation ◽  
Adsorption Capacities ◽  
Taste And Odor ◽  
Composite Photocatalysts

2-methylisoborneol (2-MIB) is a common taste and odor compound caused by off-flavor secondary metabolites, which represents one of the greatest challenges for drinking water utilities worldwide. A TiO2-coated activated carbon (TiO2/PAC) has been synthesized using the sol-gel method. A new TiO2/PAC photocatalyst has been successfully employed in photodegradation of 2-MIB under UV light irradiation. In addition, the combined results of XRD, SEM-EDX, FTIR and UV-Vis suggested that the nano-TiO2 had been successfully loaded on the surface of PAC. Experimental results of 2-MIB removal indicated that the adsorption capacities of PAC for 2-MIB were higher than that of TiO2/PAC. However, in the natural organic matter (NOM) bearing water, the removal efficiency of 2-MIB by TiO2/PAC and PAC were 97.8% and 65.4%, respectively, under UV light irradiation. Moreover, it was shown that the presence of NOMs had a distinct effect on the removal of MIB by TiO2/PAC and PAC. In addition, a simplified equivalent background compound (SEBC) model could not only be used to describe the competitive adsorption of MIB and NOM, but also represent the photocatalytic process. In comparison to other related studies, there are a few novel composite photocatalysts that could efficiently and rapidly remove MIB by the combination of adsorption and photocatalysis.

Photocatalytic performance of Cu-doped titania thin films under UV light irradiation

2021 ◽  
Vol 553 ◽  
pp. 149535
Author(s):  
Elisa Moretti ◽  
Elti Cattaruzza ◽  
Cristina Flora ◽  
Aldo Talon ◽  
Eugenio Casini ◽  
...  
Keyword(s):  
Thin Films ◽  
Photocatalytic Performance ◽  
Uv Light ◽  
Light Irradiation ◽  
Uv Light Irradiation ◽  
Doped Titania
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