DDT REMOVAL BY NANO ZERO VALENT IRON: INFLUENCE OF pH ON REMOVAL MECHANISM

Yıl 2017, Sayı: 1, 339 - 346, 09.11.2017

Kubra Altuntas Eyup Debik

Öz

Persistent organic compounds are resistant to
biological degradation and can be transported long distances by releasing into
the atmosphere and can be found in the atmosphere for a long time. DDT is one
of the persistent organic compounds which is prohibited by Stockholm
Convention. Against the prohibition in many countries, DDT, which is still in
limited use in undeveloped countries, has a very low carcinogenic concentration
(0,23 μg/L). It is stated in the literature that nanomaterials have been used
effectively in the last decades for the removal of environmental pollutants. In
this study, the mechanism of removal by nano zero valent iron was investigated
by researching the pH effect at low DDT concentration. pH and ORP changes after
treatment were investigated. Almost total DDT was removed within 5 minutes and
pH effect on removal mechanism has found to be negligible. The ORP values
decreased rapidly during the first minutes of the study. In addition, the
effluent Fe²⁺ concentrations were also investigated and these
results showed that oxidation was effective in the removal mechanism.

Anahtar Kelimeler

DDT, nZVI, removal mechanism, ORP

Kaynakça

• EPA (2017). Regional Screening Levels (RSLs) - Generic Tables (June 2017). In. Gupta V. K. and Ali I. (2008). Removal of endosulfan and methoxychlor from water on carbon slurry. Environmental Science & Technology 42(3), 766-70. Humbert H., Gallard H., Suty H. and Croue J. P. (2008). Natural organic matter (NOM) and pesticides removal using a combination of ion exchange resin and powdered activated carbon (PAC). Water Res 42(6-7), 1635-43. James Pontolillo and Eganhouse R. P. (2001). The Search for Reliable Aqueous Solubility (Sw) and Octanol-Water Partition Coefficient (Kow) Data for Hydrophobic Organic Compounds: DDT and DDE as a Case Study. U.S. Geological Survey Water-Resources Investigations Report 01-4201. Kouzayha A., Rahman Rabaa A., Al Iskandarani M., Beh D., Budzinski H. and Jaber F. (2012). Multiresidue Method for Determination of 67 Pesticides in Water Samples Using Solid-Phase Extraction with Centrifugation and Gas Chromatography-Mass Spectrometry. American Journal of Analytical Chemistry 03(03), 257-65. Lafi W. K. and Al-Qodah Z. (2006). Combined advanced oxidation and biological treatment processes for the removal of pesticides from aqueous solutions. J Hazard Mater 137(1), 489-97. Li F. B., Li X. M., Zhou S. G., Zhuang L., Cao F., Huang D. Y., Xu W., Liu T. X. and Feng C. H. (2010). Enhanced reductive dechlorination of DDT in an anaerobic system of dissimilatory iron-reducing bacteria and iron oxide. Environ Pollut 158(5), 1733-40. Lin C. and Lin K. S. (2007). Photocatalytic oxidation of toxic organohalides with TiO2/UV: The effects of humic substances and organic mixtures. Chemosphere 66(10), 1872-7. Muff J., Andersen C. D., Erichsen R. and Soegaard E. G. (2009). Electrochemical treatment of drainage water from toxic dump of pesticides and degradation products. Electrochimica Acta 54(7), 2062-8. Ormad M. P., Miguel N., Claver A., Matesanz J. M. and Ovelleiro J. L. (2008). Pesticides removal in the process of drinking water production. Chemosphere 71(1), 97-106. Samet Y., Agengui L. and Abdelhédi R. (2010). Electrochemical degradation of chlorpyrifos pesticide in aqueous solutions by anodic oxidation at boron-doped diamond electrodes. Chemical Engineering Journal 161(1-2), 167-72. Sanches S., Barreto Crespo M. T. and Pereira V. J. (2010). Drinking water treatment of priority pesticides using low pressure UV photolysis and advanced oxidation processes. Water Res 44(6), 1809-18. Sarkar B., Venkateshwarlu N., Nageswara Rao R., Bhattacharjee C. and Kale V. (2007). Potable water production from pesticide contaminated surface water—A membrane based approach. Desalination 204(1-3), 368-73. Sayles G. D., You G. R., Wang M. X. and Kupferle M. J. (1997). DDT, DDD, and DDE dechlorination by zero-valent iron. Environmental Science & Technology 31(12), 3448-54. Wu C., Tu J. W., Liu W. Z., Zhang J., Chu S. Q., Lu G. N., Lin Z. and Dang Z. (2017). The double influence mechanism of pH on arsenic removal by nano zero valent iron: electrostatic interactions and the corrosion of Fe-0. Environmental Science-Nano 4(7), 1544-52. Yahiaoui O., Aizel L., Lounici H., Drouiche N., Goosen M. F. A., Pauss A. and Mameri N. (2011). Evaluating removal of metribuzin pesticide from contaminated groundwater using an electrochemical reactor combined with ultraviolet oxidation. Desalination 270(1-3), 84-9. Zhang Y. L., Chen W., Dai C. M., Zhou C. L. and Zhou X. F. (2015). Structural Evolution of Nanoscale Zero-Valent Iron (nZVI) in Anoxic Co2+ Solution: Interactional Performance and Mechanism. Scientific Reports 5.