Wyniki wyszukiwania - BazTech

1

Adsorption of ciprofloxacin from aqueous environment by using synthesized nanoceria

Rahdar Abbas, Rahdar Somayeh, Ahmadi Shahin, Fu Jie

Ecological Chemistry and Engineering. S

|

2019

|

Vol. 26, nr 2

299--311

EN

Antibiotics are widely detected emerging contaminants in water environments and possess high potential risks to human health and aquatic life. However, conventional water treatment processes cannot remove them sufficiently. To develop innovative nanoadsorbents for effectively remove antibiotic contaminants from water environment, nanoceria were prepared via in situ precipitation method, and evaluated their adsorption capacity for a model antibiotic, ciprofloxacin (CIP). The properties of the prepared nanoceria were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD) and vibration sample magnetization (VSM). The effect of various operating parameters such as pH, initial CIP concentration, contact time, and adsorbent dosage on adsorptions of CIP were studied in batch experiments. Maximum adsorption capacity of the nanoceria was 49.38 mg/g at the conditions of pH 5, initial CIP concentration of 200 mg/dm3 and adsorbent dosage of 0.2 g/dm3, when 95.43 % of the CIP was removed. For adsorption kinetics, both pseudo-first-order and pseudo-second-order models can well describe the experimental data, indicating that the adsorption process was controlled by both physical diffusion and chemical interaction. For adsorption isotherms, the Freundlich model could fit the experimental data better than the Langmuir and Temkin models, suggesting a multilayer adsorption process. The thermal dynamics study showed the absorption process was spontaneity, exothermic, and irreversible. Finally it was concluded that the nanoceria can be used effectively for CIP removal.

2

Environmental risk assessment of selected pharmaceuticals present in surface waters in relation to animals

Załęska-Radziwiłł M., Łebkowska M., Affek K., Zarzeczna A.

Archives of Environmental Protection

|

2011

|

Vol. 37, no. 3

31-42

EN

This paper addresses the issue of antibacterial drugs, estrogens and cytostatic drugs' presence in surface waters and their influence on animals. The ecotoxicity and the impact of three active compounds: ciprofloxacin, 17α-ethinylestradiol and 5-fluorouracil on protozoa, crustaceans and fish were examined. Acute tests (crustaceans' immobilization test, fish survival test, enzymatic test on Daphnia magna) and chronic tests (growth test on protozoa, reproduction test on crustaceans and juvenile growth test on two species of fish) were performed. Acute toxicity studies revealed diversified species - sensitivity to the tested compounds. Crustaceans Artemia salina were the most resistant to all three pharmaceuticals. Fish also demonstrated low sensitivity to ciprofloxacin and 5-fluorouracil (LC(EC)50-96h > 100 mg/l). In the survival tests, the greatest harm in respect to fish and crustaceans was demonstrated by 17α-ethinylestradiol, and in the enzymatic tests - by ciprofloxacin. In all chronic tests, the toxic effects of drugs were proven. Tested compounds limited reproduction of crustaceans and growth of protozoa and fry. The risk assessment, conducted on the basis of the PEC/PNEC quotient, showed a significant risk in relation to aquatic animals caused by the presence of 17α-ethinylestradiol and 5-fluorouracil in concentrations detected in surface waters.

PL

W pracy podjęto problem obecności leków antybakteryjnych, estrogenów i cytostatyków w wodach powierzchniowych i ich oddziaływania na organizmy zwierzęce. Zbadano ekotoksyczność trzech substancji aktywnych: cyprofloksacyny, 17 α-etynyloestradiolu i 5-fluorouracylu w odniesieniu do pierwotniaków, skorupiaków i ryb. Przeprowadzono testy ostre: immobilizacji ze skorupiakami, przeżywalności z rybami, enzymatyczny z Daphnia magna, oraz chroniczne: wzrostowy z pierwotniakami, reprodukcji ze skorupiakami i wzrostu narybku z dwoma gatunkami ryb. Badania toksyczności ostrej wykazały zróżnicowaną wrażliwość organizmów - najbardziej oporne na działanie wszystkich badanych związków były skorupiaki Artemia salina, małą wrażliwość na działanie cyprofloksacyny i 5-fluorouracylu wykazały również ryby – (LC(EC)50-96h > 100mg/l). Największą szkodliwością w stosunku do ryb i skorupiaków w badaniach przeżywalności charakteryzował się 17 α-etynyloestradiol, a w badaniach enzymatycznych cyprofloksacyna. We wszystkich testach chronicznych stwierdzono działanie toksyczne badanych leków. Związki te ograniczały reprodukcję skorupiaków, wzrost pierwotniaków i narybku. Ocena ryzyka dokonana na podstawie ilorazu PEC/PNEC wykazała duże ryzyko w stosunku do zwierząt wodnych wywołane obecnością 17 α-etynyloestradiolu i 5-fluorouracylu w wykrywanych stężeniach w wodach powierzchniowych.

3

Wiązanie jonowe cyprofloksacyny na różnych typach protez naczyniowych

Osińska-Jaroszuk M., Ginalska G.

Engineering of Biomaterials

|

2008

|

Vol. 11, no. 77-80

23--24