Degradation of two fluoroquinolone antibiotics photoinduced by Fe(iii)-microalgae suspension in an aqueous solution

2015 ◽  
Vol 14 (4) ◽  
pp. 693-699 ◽  
Author(s):  
Liyun Ge ◽  
Huanhuan Deng
Keyword(s):  
Aqueous Solution ◽  
High Pressure ◽  
Isochrysis Galbana ◽  
Marine Microalgae ◽  
Laboratory Scale ◽  
Mercury Lamp ◽  
Platymonas Subcordiformis ◽  
Ciprofloxacin Hydrochloride ◽  
Fluoroquinolone Antibiotics ◽  
Scale Experiment

Two fluoroquinolone (FQ) antibiotics, enrofloxacin (ENR) and ciprofloxacin hydrochloride (CIP), and two marine microalgae, Platymonas subcordiformis and Isochrysis galbana, were investigated under irradiation with a high-pressure mercury lamp (HPML) in a laboratory-scale experiment.

Photodegradation of Two Antibiotics Involved with Fe (III) and Marine Algae

2012 ◽  
Vol 260-261 ◽  
pp. 1047-1051
Author(s):  
Li Yun Ge ◽  
Yong Gang Huang ◽  
De Xiang Gao ◽  
Huan Huan Deng
Keyword(s):  
High Pressure ◽  
Aqueous Solutions ◽  
Marine Algae ◽  
Degradation Efficiency ◽  
Photochemical Degradation ◽  
Mercury Lamp ◽  
Platymonas Subcordiformis ◽  
Ciprofloxacin Hydrochloride ◽  
Initial Concentration ◽  
Photodegradation Rate

The photochemical degradation of two antibiotics, enrofloxacin and ciprofloxacin hydrochloride, was preliminarily studied under irradiation with a high-pressure mercury lamp (HMPL) in this paper. The influence of initial concentration of antibiotics, Fe (Ⅲ) and platymonas subcordiformis on the degradation efficiency of antibiotics were investigated. The results suggested that in the presence of P. subcordiformis, the degradation efficiency of enrofloxacin and ciprofloxacin hydrochloride were 85.0% and 84.2% in aqueous solutions underwent photodegradation under HMPL irradiation, respectively. Moreover, the lower initial concentration of antibiotics improved photodegradation rate of antibiotics.

Ultraviolet irradiation combined with manganese ore catalyzed ozonation of 4-chlorophenol in aqueous solution

2010 ◽  
Vol 10 (1) ◽  
pp. 97-104 ◽  
Author(s):  
Jie Fu ◽  
Guo Chen ◽  
Ying Yang ◽  
Zhi-Ming Zhang ◽  
Qing-Fu Zeng ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
High Pressure ◽  
Uv Irradiation ◽  
Catalytic Effect ◽  
Ph Value ◽  
Manganese Ore ◽  
Mercury Lamp ◽  
Acid Condition ◽  
Important Species ◽  
Uv Lamp

We have investigated ultraviolet (UV) irradiation combined with manganese ore (MO) catalyzed ozonation of 4-cholorophenol (4-CP) in aqueous solution. The preliminary results showed UV irradiation and MO had a strong synergetic catalytic effect on ozonation. We also studied the effect of UV lamp power, MO dosage, O3 dosage, initial 4-CP concentration, pH value and temperature. The results showed that high pressure mercury lamp (HPML) was more favorable for the degradation of 4-CP than low pressure mercury lamp (LPML). The optimal MO and O3 dosages were 2 g/L and 2 g/h respectively. When the 4-CP concentration was over 15 mg/L, the decrease of degradation efficiency accelerated. The acid condition was favorable for the degradation of 4-CP by UV/MO/O3. The reaction temperature could not be over 50°C. Through the mechanism discussion, we found that Mn2 +  was the most important species to catalyze the ozonation. In addition, UV irradiation could also accelerate the degradation by promoting the production of ∙OH.

A photoelectron microscope study of surfaces

1989 ◽  
Vol 47 ◽  
pp. 10-11
Author(s):  
W. Engel ◽  
M. Kordesch ◽  
A. M. Bradshaw ◽  
E. Zeitler
Keyword(s):  
Electron Microscopy ◽  
High Pressure ◽  
Field Strength ◽  
Uv Light ◽  
Physical Property ◽  
Photon Flux ◽  
Mercury Lamp ◽  
Object Surface ◽  
The Sixties ◽  
Physical Features

Photoelectron microscopy is as old as electron microscopy itself. Electrons liberated from the object surface by photons are utilized to form an image that is a map of the object's emissivity. This physical property is a function of many parameters, some depending on the physical features of the objects and others on the conditions of the instrument rendering the image.The electron-optical situation is tricky, since the lateral resolution increases with the electric field strength at the object's surface. This, in turn, leads to small distances between the electrodes, restricting the photon flux that should be high for the sake of resolution.The electron-optical development came to fruition in the sixties. Figure 1a shows a typical photoelectron image of a polycrystalline tantalum sample irradiated by the UV light of a high-pressure mercury lamp.

Sign in / Sign up

Export Citation Format

Share Document