Treatment of isoproturon with advanced oxidation proceses

Abstract

Isoproturon is an organic chemical component and is used to control weeds in agricultural activities. Residues of isoproturone in the soil can create toxic effects for living organisms, mix with underground and surface waters and create pollution. Therefore, isoproturon can pose a significant environmental problem. Hydroxyl radicals (OH●), which provide oxidative decomposition of organic substances, are produced by advanced oxidation processes (IOP). The aim of this study is to examine the removal of isoproturone by advanced oxidation processes such as UV/H2O2, UV/H2O2/Fe+2, UV/H2O2/NTA, UV/H2O2/Fe+2/NTA. Experiments were designed using the Box-Behnken statistical design method. By keeping the oxidant (H2O2) concentration constant in the design, the effect of catalyst (Fe+2), chelator (NTA) concentrations and reaction time changes on Isoproturon removal efficiency was investigated. Working range for independent variables; Fe+2 concentration was determined as 0-5 mg/L, NTA (nitrilotriasetik asit) concentration was 0-3 mg/L, reaction time was determined as 5-30 minutes. The purification of isoproturone with advanced oxidation processes was achieved with an efficiency of approximately 60%, and it was observed that it did not turn into a toxic by-product as a result of the analysis. As optimum conditions; reaction time was determined as 5 minutes, Fe+2 concentration was 4 mg/L, NTA concentration was 1.5 mg/L. In this case, the optimum value of the Fe+2/NTA ratio was found to be between 2-2.5.

Keywords

• Box-Behnken
• Isoproturon
• Homojen Photo-Fenton Process
• NTA

Isoproturonun İleri Oksidasyon Prosesleri (UV/H2O2, Fe+2, NTA) ile Arıtımı

Abstract

İsoproturon organik yapılı kimyasal bir bileşen olup tarım faaliyetlerinde yabancı otları kontrol etmek amaçlı kullanılmaktadır. İsoproturonun toprakta oluşan kalıntıları, canlı organizmalar için toksik etki yaratabilme, yeraltı ve yerüstü sularına karışarak kirlilik oluşturabilmektedir. Bu nedenle isoproturon çevreye önemli bir sorun teşkil edebilmektedir. Organik maddelerin oksidatif olarak parçalanmasını sağlayan hidroksil radikalleri (OH●), ileri oksidasyon prosesleri (İOP) tarafından üretilmektedir. Bu çalışmanın amacı isoproturonun ileri oksidasyon prosesleri olan UV/H2O2, UV/H2O2/Fe+2, UV/H2O2/NTA, UV/H2O2/Fe+2/NTA yöntemleriyle giderimini incelemektir. Deneyler Box-Behnken istatistiksel tasarım yöntemi kullanılarak tasarlanmıştır. Tasarımda oksidant (H2O2) konsantrasyonu sabit tutularak, katalizör (Fe+2), şelatlayacı (NTA) konsantrasyonları ve reaksiyon süresi değişiminin, İsoproturon giderim verimine olan etkisi incelenmiştir. Bağımsız değişkenler için çalışma aralığı; Fe+2 konsantrasyonu 0-5 mg/L, NTA (nitrilotriasetik asit) konsantrasyonu 0-3 mg/L, reaksiyon süresi 5-30 dakika olarak belirlenmiştir. İleri oksidasyon prosesleri ile isoproturonun arıtımı yaklaşık %60 verimle gerçekleşmiş olup analizler sonucunda toksik bir yan ürüne dönüşmediği gözlemlenmiştir. Optimum koşullar olarak; reaksiyon süresi 5 dakika, Fe+2 konsantrasyonu 4 mg/L, NTA konsantrasyonu 1,5 mg/L olarak belirlenmiştir. Bu durumda Fe+2/NTA oranın optimum 2-2.5 arasında olduğu saptanmıştır.

Keywords

• Box-Behnken
• İsoproturon
• Homojen Foto-Fenton Prosesi
• NTA

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