Tags

Type your tag names separated by a space and hit enter

Evaluation of solar photocatalysis using TiO2 slurry in the inactivation of Cryptosporidium parvum oocysts in water.
J Photochem Photobiol B. 2016 Oct; 163:92-9.JP

Abstract

Cryptosporidium is a genus of enteric protozoan parasites of medical and veterinary importance, whose oocysts have been reported to occur in different types of water worldwide, offering a great resistant to the water treatment processes. Heterogeneous solar photocatalysis using titanium dioxide (TiO2) slurry was evaluated on inactivation of Cryptosporidium parvum oocysts in water. Suspensions of TiO2 (0, 63, 100 and 200mg/L) in distilled water (DW) or simulated municipal wastewater treatment plant (MWTP) effluent spiked with C. parvum oocysts were exposed to simulated solar radiation. The use of TiO2 slurry at concentrations of 100 and 200mg/L in DW yielded a high level of oocyst inactivation after 5h of exposure (4.16±2.35% and 15.03±4.54%, respectively, vs 99.33±0.58%, initial value), representing a good improvement relative to the results obtained in the samples exposed without TiO2 (51.06±9.35%). However, in the assays carried out using simulated MWTP effluent, addition of the photocatalyst did not offer better results. Examination of the samples under bright field and epifluorescence microscopy revealed the existence of aggregates comprising TiO2 particles and parasitic forms, which size increased as the concentration of catalyst and the exposure time increased, while the intensity of fluorescence of the oocyst walls decreased. After photocatalytic disinfection process, the recovery of TiO2 slurry by sedimentation provided a substantial reduction in the parasitic load in treated water samples (57.81±1.10% and 82.10±2.64% for 200mg/L of TiO2 in DW and in simulated MWTP effluent, respectively). Although further studies are need to optimize TiO2 photocatalytic disinfection against Cryptosporidium, the results obtained in the present study show the effectiveness of solar photocatalysis using TiO2 slurry in the inactivation of C. parvum oocysts in distilled water.

Authors+Show Affiliations

Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Santiago de Compostela, Campus Vida, 15782 Santiago de Compostela, A Coruña, Spain.Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Santiago de Compostela, Campus Vida, 15782 Santiago de Compostela, A Coruña, Spain.Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Santiago de Compostela, Campus Vida, 15782 Santiago de Compostela, A Coruña, Spain. Electronic address: hipolito.gomez@usc.es.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

27543761

Citation

Abeledo-Lameiro, María Jesús, et al. "Evaluation of Solar Photocatalysis Using TiO2 Slurry in the Inactivation of Cryptosporidium Parvum Oocysts in Water." Journal of Photochemistry and Photobiology. B, Biology, vol. 163, 2016, pp. 92-9.
Abeledo-Lameiro MJ, Ares-Mazás E, Gómez-Couso H. Evaluation of solar photocatalysis using TiO2 slurry in the inactivation of Cryptosporidium parvum oocysts in water. J Photochem Photobiol B. 2016;163:92-9.
Abeledo-Lameiro, M. J., Ares-Mazás, E., & Gómez-Couso, H. (2016). Evaluation of solar photocatalysis using TiO2 slurry in the inactivation of Cryptosporidium parvum oocysts in water. Journal of Photochemistry and Photobiology. B, Biology, 163, 92-9. https://doi.org/10.1016/j.jphotobiol.2016.08.016
Abeledo-Lameiro MJ, Ares-Mazás E, Gómez-Couso H. Evaluation of Solar Photocatalysis Using TiO2 Slurry in the Inactivation of Cryptosporidium Parvum Oocysts in Water. J Photochem Photobiol B. 2016;163:92-9. PubMed PMID: 27543761.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Evaluation of solar photocatalysis using TiO2 slurry in the inactivation of Cryptosporidium parvum oocysts in water. AU - Abeledo-Lameiro,María Jesús, AU - Ares-Mazás,Elvira, AU - Gómez-Couso,Hipólito, Y1 - 2016/08/12/ PY - 2016/04/14/received PY - 2016/08/10/accepted PY - 2016/8/21/entrez PY - 2016/8/21/pubmed PY - 2017/3/10/medline KW - Cryptosporidium parvum KW - Inactivation KW - Retention KW - Solar radiation KW - Titanium dioxide KW - Water SP - 92 EP - 9 JF - Journal of photochemistry and photobiology. B, Biology JO - J Photochem Photobiol B VL - 163 N2 - Cryptosporidium is a genus of enteric protozoan parasites of medical and veterinary importance, whose oocysts have been reported to occur in different types of water worldwide, offering a great resistant to the water treatment processes. Heterogeneous solar photocatalysis using titanium dioxide (TiO2) slurry was evaluated on inactivation of Cryptosporidium parvum oocysts in water. Suspensions of TiO2 (0, 63, 100 and 200mg/L) in distilled water (DW) or simulated municipal wastewater treatment plant (MWTP) effluent spiked with C. parvum oocysts were exposed to simulated solar radiation. The use of TiO2 slurry at concentrations of 100 and 200mg/L in DW yielded a high level of oocyst inactivation after 5h of exposure (4.16±2.35% and 15.03±4.54%, respectively, vs 99.33±0.58%, initial value), representing a good improvement relative to the results obtained in the samples exposed without TiO2 (51.06±9.35%). However, in the assays carried out using simulated MWTP effluent, addition of the photocatalyst did not offer better results. Examination of the samples under bright field and epifluorescence microscopy revealed the existence of aggregates comprising TiO2 particles and parasitic forms, which size increased as the concentration of catalyst and the exposure time increased, while the intensity of fluorescence of the oocyst walls decreased. After photocatalytic disinfection process, the recovery of TiO2 slurry by sedimentation provided a substantial reduction in the parasitic load in treated water samples (57.81±1.10% and 82.10±2.64% for 200mg/L of TiO2 in DW and in simulated MWTP effluent, respectively). Although further studies are need to optimize TiO2 photocatalytic disinfection against Cryptosporidium, the results obtained in the present study show the effectiveness of solar photocatalysis using TiO2 slurry in the inactivation of C. parvum oocysts in distilled water. SN - 1873-2682 UR - https://www.unboundmedicine.com/medline/citation/27543761/Evaluation_of_solar_photocatalysis_using_TiO2_slurry_in_the_inactivation_of_Cryptosporidium_parvum_oocysts_in_water_ DB - PRIME DP - Unbound Medicine ER -