UV light irradiation combined with nitrate for degradation of bisphenol A: kinetics, transformation pathways, and acute toxicity assessment

2022 ◽  
Author(s):  
Zhiquan Li ◽  
Congwei Luo ◽  
Fengxun Tan ◽  
Daoji Wu ◽  
Xuedong Zhai ◽  
...  
Keyword(s):  
Acute Toxicity ◽  
Bisphenol A ◽  
Human Health ◽  
Endocrine Disruptor ◽  
Uv Light ◽  
Low Pressure ◽  
Toxicity Assessment ◽  
Light Irradiation ◽  
Uv Light Irradiation ◽  
Uv Lamp

As an endocrine disruptor, bisphenol A (BPA) is a severe threat to human health. In this study, nitrate (NO3-) photolysis with a low-pressure UV lamp (LP-UV) was employed to degrade...

Rapid Oxidation of Silicon Using UV-Light Irradiation in Low-Pressure, Highly Concentrated Ozone Gas below 300 °C

2007 ◽  
Vol 46 (5A) ◽  
pp. 2835-2839 ◽  
Author(s):  
Tetsuya Nishiguchi ◽  
Shigeru Saitoh ◽  
Naoto Kameda ◽  
Yoshiki Morikawa ◽  
Mitsuru Kekura ◽  
...  
Keyword(s):  
Uv Light ◽  
Low Pressure ◽  
Light Irradiation ◽  
Uv Light Irradiation

scholarly journals Catalytic Degradation of Textile Wastewater Effluent by Peroxide Oxidation Assisted by UV Light Irradiation

Catalysts ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 509 ◽  
Author(s):  
Sarto Sarto ◽  
Paesal Paesal ◽  
Irine Bellina Tanyong ◽  
William Teja Laksmana ◽  
Agus Prasetya ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Oxide Catalyst ◽  
Uv Light ◽  
Oxygen Demand ◽  
Catalytic Degradation ◽  
Wastewater Effluent ◽  
Light Irradiation ◽  
Iron Oxide Catalyst ◽  
Uv Light Irradiation ◽  
Uv Lamp

Textile industries produce a complex wastewater which is difficult to be treated. In this work, a catalytic degradation of wastewater effluent composed of sulphur black coloring agent discharged by industry was studied. UV lamp power, peroxide concentration, pH, and iron oxide catalyst were varied to determine the best conditions for oxidative treatment. Kinetic parameters were evaluated based on the reaction model proposed. In the absence of iron oxide catalyst, chemical oxygen demand (COD) and biological oxygen demand (BOD) degradation of up to 80% and 75%, respectively, were observed as resulting from using an H2O2 concentration of 0.61 moles/L, UV lamp power of 30 watts, and pH of 6. When using an iron oxide catalyst combined with UV light irradiation, the degradation rate could be increased significantly, while similar final COD and BOD degradation percentages resulted. It is found that the reaction rate order was shifted from first order to second order when using an H2O2/UV/Fe2O3 system. The results could be an alternative for treating textile industry wastewater, and the parameters obtained can be used for equipment scale-up.

scholarly journals UV Light Combined with Nitrate Remove Bisphenol A: Kinetics, Transformation Pathways, and Acute Toxicity Assessment

2021 ◽  
Author(s):  
Zhiquan Li ◽  
Congwei Luo ◽  
Fengxun Tan ◽  
Daoji Wu ◽  
Shishun Wang ◽  
...  
Keyword(s):  
Acute Toxicity ◽  
Bisphenol A ◽  
Ph Value ◽  
Uv Light ◽  
Degradation Products ◽  
Nitrate Concentration ◽  
Inner Filter Effect ◽  
Toxicity Assessment ◽  
Filter Effect ◽  
Transformation Pathways

Abstract As a powerful endocrine disruptor, bisphenol A (BPA) is a serious threat to human health. In this study, low-pressure UV lamp (LP-UV) photolysis nitrate was used to degrade BPA in different aqueous solutions. Results showed that BPA could be decomposed efficiently in the UV/nitrate process. ·OH played a significant role in the UV/nitrate process, and the steady-state concentration of ·OH ([·OH]ss) was calculated to be 5.26×10-15 M under control conditions. Moreover, the contributions of UV irradiation (4.1%), ·OH (52.7%), and reactive nitrogen species (43.2%) were obtained. The observed rate constant of BPA degradation (kobs) increased with nitrate concentration since more activity species were generated in high nitrate concentration. BPA degradation rate significantly accelerated as the pH value rose, it was ascribed to the increase of the molar absorption coefficient and the portion of ionic BPA. However, kobs declined with increasing BPA concentration result from the inner filter effect and the competition of more generated intermediate products. The increasing decomposition of BPA with the addition of HCO3-/CO32- (0~10 mM), which could be explained as HCO3-/CO32- scavenged ·OH resulting in the accumulation of ·NO2. The effect of Cl- (0~20 mM) can be ignored, which suggested reactive chlorine radicals degraded BPA effectively. The kobs reduced acutely when NOM (0~5mg-C/L) existed in the solution, this could be ascribed to the dual role of NOM inner filter effect and reactive radicals scavenging effect. Further, several degradation products were detected and possible transformation pathways were put forward. Remarkably, the acute toxicity of BPA was slightly enhanced then decayed in the UV/nitrate process.

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

scholarly journals Hydrolysis of Protein modified with UV Light Irradiation by Proteases

1960 ◽  
Vol 34 (2) ◽  
pp. 142-145
Author(s):  
Mitsuo KOSHIKA ◽  
Yataro OBATA
Keyword(s):  
Uv Light ◽  
Light Irradiation ◽  
Uv Light Irradiation ◽  
Hydrolysis Of

Amino acid-templated zinc phosphites: low-dimensional structures, fluorescence, and nonlinear optical properties

2021 ◽  
Author(s):  
Yumei Mao ◽  
Xuehua Dong ◽  
Yuandan Deng ◽  
Jing Li ◽  
Ling Huang ◽  
...  
Keyword(s):  
Optical Properties ◽  
Amino Acid ◽  
Nonlinear Optical ◽  
Uv Light ◽  
Nonlinear Optical Properties ◽  
Light Irradiation ◽  
Blue Fluorescence ◽  
Structure Directing Agent ◽  
Uv Light Irradiation ◽  
Low Dimensional

Two new zinc phosphites were prepared using the amino acid alanine as structure-directing agent. They have tubular and ladder-like structures exhibiting blue fluorescence upon UV light irradiation. Notably, the tubular...

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