Pakistan Journal of Biological Sciences1028-88801812-5735Asian Network for Scientific Information10.3923/pjbs.2015.27.312 Photocatalysis]]>HassarangseeSiriporn UthaibutraJamnong NomuraNakao WhangchaiKanda 12015181Ethion, an insecticide, is widely used with fruit and vegetable
crops. This research studied the reduction and oxidative degradation of standard
ethion by TiO2 photocatalysis. A standard ethion solution (1 mg L-1)
was treated with different concentrations of TiO2 powder (5, 10,
20, 40 and 60 mg mL-1) for 0, 15, 30, 45 and 60 min. The amount of
ethion residue was detected by gas chromatography with flame photometric detection
(GC-FPD) and the concentration of anions produced as major degradation products
was determined by Ion Chromatography (IC). The TiO2 photocatalysis
efficiently reduced ethion concentrations, with the highest degradation rate
occurring within the first 15 min of reaction. The reaction produced sulphate
and phosphate anions. The TiO2 photocatalysis reduced 1 mg L-1
ethion to 0.18 mg L-1 when treated with 60 mg mL-1
TiO2 powder for 60 min. The lethal concentration (LC50)
of standard ethion was also estimated and compared to the treated ethion. All
treatments, especially 60 mg mL-1 TiO2 powder, markedly
detoxified ethion, as tested with brine shrimp (Artemia salina L.), with
an LC50 value of 765.8 mg mL-1, compared to the control
of 1.01 mg mL-1.]]>Calza, P., C. Medana, M. Pazzi, C. Baiocchi and E. Pelizzetti,2004536369Carp, O., C.L. Huisman and A. Reller,20043233177Desouky, M.M.A., H. Abdel-Gawad and B. Hegazi,2013Procambarus clarkii.]]>524252Extonet,19961996Florencio, M.H., E. Pires, A.L. Castro, M.R. Nunes, C. Borges and F.M. Costa,200455345355Fujishima, A., T.N. Rao and D.A. Tryk,20001121Hashimoto, K., H. Irie and A. Fujishima,20052 photocatalysis: A historical overview and future prospects.]]>4482698285Herrmann, J.M. and C. Guillard,20003417422Herrmann, J.M., C. Guillard, M. Arguello, A. Aguera, A. Tejedor, L. Piedra and A. Fernandez-Alba,199954353367Jian, C.,19971997Konstantinou, I.K. and T.A. Albanis,20021310117Konstantinou, I.K. and T.A. Albanis,20042 suspensions using artificial and solar light: A review.]]>2004pp: 299304Lomoră, M., C. Draghici and Al. Enesca,201145158Gupta, S.M. and M. Tripathi,20112 nanoparticles.]]>5616391657Mountacer, H., S.M. Nemmaoui, S. Rafqah, G. Voyard and M. Sarakha,20132 photocatalysis of the organophosphorus fenamiphos: Insight into the degradation mechanism.]]>2013Philippopoulos, C.J. and M.D. Nikolaki,20102010pp: 89-107pp: 89-107Rahman, M.A. and M. Muneer,2005181161172Rajeswari, R. and S. Kanmani,20092 photocatalysis.]]>6810631067Ravelli, D., D. Dondi, M. Fagnoni and A. Albini,201099442442Shayeghi, M., M. Dehghani, M. Alimohammadi and K. Goodini,201264553Tariq, M.A., M. Faisal, M. Muneer and D. Bahnemann,2007265231236Tsuda, T., M. Kojima, H. Harada, A. Nakajima and S. Aoki,199735939949Stasinakis, A.S.,200810376385