Intensification of light green SF yellowish (LGSFY) photodegradion in water by iodate ions: Iodine radicals implication in the degradation process and impacts of water matrix components

2019 ◽  
Vol 652 ◽  
pp. 1219-1227 ◽  
Author(s):  
Amal Haddad ◽  
Slimane Merouani ◽  
Chiraz Hannachi ◽  
Oualid Hamdaoui ◽  
Béchir Hamrouni
Keyword(s):  
Degradation Process ◽  
Water Matrix ◽  
Matrix Components ◽  
Light Green ◽  
Iodate Ions

Degradation of cyanobacterial hepatotoxins in batch experiments

2001 ◽  
Vol 43 (12) ◽  
pp. 229-232 ◽  
Author(s):  
M. J. Miller ◽  
H. J. Fallowfield
Keyword(s):  
Textural Properties ◽  
Clay Content ◽  
Cost Effective ◽  
Complete Removal ◽  
Degradation Process ◽  
Organic Carbon Content ◽  
Bank Filtration ◽  
Batch Experiments ◽  
Water Matrix ◽  
Toxin Removal

Bank filtration offers a cost effective and low maintenance technique for the removal of cyanobacterial hepatotoxins from drinking water. For bank filtration to be effective, the toxins must be degraded. The broad aim of this research was to determine whether the hepatotoxins, nodularin and microcystin-LR, could be completely removed from the soil/water matrix of three soils by microbial degradation. The results indicated that complete toxin removal was possible within 10-16 d in 2/3 soils that were incubated in the dark at 20°C. The soils with the highest organic carbon content (2.9%) and the highest clay content (16.1%) were the most effective at removing the toxins in batch experiments. However, the sandy soil (98.5% sand) was incapable of degrading either toxin. The half-lives of toxin losses due to adsorption, desorption and degradation were calculated and for all soils. The degradation process had the highest half-life for both toxins. This suggested that degradation was likely to be the rate-limiting step of complete toxin removal. It was concluded that when a bank filtration site was being chosen, the degradation potential and the textural properties of the riverbank soil would be important when considering complete removal of cyanobacterial hepatotoxins.

Degradation of the antibiotic oxacillin in water by anodic oxidation with Ti/IrO 2 anodes: Evaluation of degradation routes, organic by-products and effects of water matrix components

2015 ◽  
Vol 279 ◽  
pp. 103-114 ◽  
Author(s):  
Ana L. Giraldo ◽  
Edgar D. Erazo-Erazo ◽  
Oscar A. Flórez-Acosta ◽  
Efraim A. Serna-Galvis ◽  
Ricardo A. Torres-Palma
Keyword(s):  
Anodic Oxidation ◽  
Water Matrix ◽  
Matrix Components ◽  
By Products

scholarly journals Photocatalytic Degradation of Azithromycin by Nanostructured TiO2 Film: Kinetics, Degradation Products, and Toxicity

Materials ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 873 ◽  
Author(s):  
Mirta Čizmić ◽  
Davor Ljubas ◽  
Marko Rožman ◽  
Danijela Ašperger ◽  
Lidija Ćurković ◽  
...  
Keyword(s):  
Photocatalytic Degradation ◽  
Tio2 Film ◽  
Degradation Products ◽  
Sol Gel ◽  
Real Life ◽  
Degradation Process ◽  
Nanostructured Tio2 ◽  
Water Matrix ◽  
Degradation Rates ◽  
Uv C

In this paper, nanostructured TiO2 film was prepared by the by sol-gel process and dip-coating technique with titanium tetraisopropoxide as a precursor. After heat treatment at 550 °C, the deposited film was characterized by means of micro-Raman spectroscopy and atomic force microscopy (AFM). It was found that the TiO2 film consisted of only the TiO2 anatase phase and showed a granular microstructure. Photocatalytic degradation of azithromycin by using sol-gel nanostructured TiO2 film was studied to define the most effective degradation process for potential use in wastewater treatment. Different factors were evaluated during photocatalysis, such as pH (3, 7, and 10), water matrix (ultrapure water and synthetic municipal waste water effluent), influence of another pharmaceutically active compound (sulfamethoxazole, one of the most often detected pharmaceutic compounds in waste waters), and radiation sources (low pressure ultraviolet (UV) mercury lamps with a UV-A and UV-C range; a light-emitting diode (LED) lamp with a radiation peak at 365 nm). The most effective degradation process was achieved with the UV-C irradiation source in matrices at pH 10. The water matrix had little effect on the photocatalytic degradation rates of azithromycin. The presence of sulfamethoxazole in the water matrix decreased the degradation rate of azithromycin, however, only in matrices with a pH level adjusted to 10. During the experiments, five azithromycin degradation products were identified and none of them showed toxic properties, suggesting effective removal of azithromycin. LED 365 nm as the irradiation source was not as effective as the UV-C lamp. Nevertheless, considering the cost, energy efficiency, and environmental aspects of the irradiation source, the LED lamp could be a “real-life” alternative.

Study of the influence of water matrix components on admicellar sorbents

2007 ◽  
Vol 388 (8) ◽  
pp. 1823-1830 ◽  
Author(s):  
Amalia García-Prieto ◽  
Loreto Lunar ◽  
Soledad Rubio ◽  
Dolores Pérez-Bendito
Keyword(s):  
Water Matrix ◽  
Influence Of Water ◽  
Matrix Components

Odontoblast Function Seen as the Response of Dentinal Tissue to Dental Caries

2001 ◽  
Vol 15 (1) ◽  
pp. 68-71 ◽  
Author(s):  
Markku Larmas
Keyword(s):  
Degradation Products ◽  
Organic Matrix ◽  
Degradation Process ◽  
Caries Lesion ◽  
Cellular Event ◽  
Phosphate Ions ◽  
Extracellular Compartment ◽  
Inorganic Composition ◽  
Matrix Components ◽  
Carious Process

Microbes are responsible for the initiation and maintaining of carious processes. They have an efficient machinery for dissolving crystalline hydroxyapatite. When initiating carious processes, microbial acid formation determines the rate of the process in enamel. When the process reaches dentin, the micro-environment changes. Dentinal fluid in dentin tubules is the liquid where dissolving products of apatites are destroyed. Inorganic composition of dentinal fluid, however, is not altered much during the carious process, indicating that a functional secretory domain is working to pump the dissolved calcium and phosphate ions out of the fluid. Activation of odontoblast alkaline phosphatase and dentin latent collagenases is the known cellular event during the carious process in dentin. Because the caries lesion is by definition undermining, this suggests that, in this degradation process, the extracellular compartment, crystalline hydroxyapatite is dissolved by microbial acids, and a mixture of proteinases degrades the organic matrix. The degradation products of collagen and other matrix components in dentinal fluid must be transported either through the caries lesion in the enamel to saliva or through the odontoblast to the pulp (active transport). This facilitates further processing of the degradation products intracellularly during the passage through the cell.

Techniques For The Preparation of Tissue Samples Containing Injectable Polymer Microcapsules

1985 ◽  
Vol 43 ◽  
pp. 710-711
Author(s):  
G.E. Visscher ◽  
R. L. Robison ◽  
G. J. Argentieri
Keyword(s):  
Drug Delivery ◽  
Drug Delivery Systems ◽  
Gastrocnemius Muscle ◽  
Degradation Process ◽  
Delivery Systems ◽  
Tissue Reaction ◽  
Electron Microscopic ◽  
Tissue Samples ◽  
Injectable Polymer ◽  
Microscopic Techniques

The use of various bioerodable polymers as drug delivery systems has gained considerable interest in recent years. Among some of the shapes used as delivery systems are films, rods and microcapsules. The work presented here will deal with the techniques we have utilized for the analysis of the tissue reaction to and actual biodegradation of injectable microcapsules. This work has utilized light microscopic (LM), transmission (TEM) and scanning (SEM) electron microscopic techniques. The design of our studies has utilized methodology that would; 1. best characterize the actual degradation process without artifacts introduced by fixation procedures and 2. allow for reproducible results.In our studies, the gastrocnemius muscle of the rat was chosen as the injection site. Prior to the injection of microcapsules the skin above the sites was shaved and tattooed for later recognition and recovery. 1.0 cc syringes were loaded with the desired quantity of microcapsules and the vehicle (0.5% hydroxypropylmethycellulose) drawn up. The syringes were agitated to suspend the microcapsules in the injection vehicle.

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