حذف اكسايشي فنول و 4-نيتروفنول در حضور كاتاليست¬هاي پلي-اكسومتالات نوع كگين استخلاف شده با عناصر واسطه

Oxidative removal of phenol an‎d 4-nitrophenol in the presence of transition metal substituted Keggin-type polyoxometalates catalysts

شيمي معدني

Polyoxometalates (POMs) are important anionic cluster compounds that have attracted significant attention due to their unique properties, such as acidity an‎d catalytic activity. Among various types of POMs, Keggin-type polyoxometalates (TBA)X[PW11MO39[. n H2O are particularly notable for their stability an‎d versatility. Phenol an‎d 4-nitrophenol are hazardous pollutants that pose serious risks to human health, making their removal highly important. In this study, several tetrabutylammonium salts of transition metal-substituted polyoxometalates were synthesized an‎d characterized, an‎d their catalytic activity in the degradation of phenol an‎d 4-nitrophenol using hydrogen peroxide as a green oxidant under ambient conditions was investigated. Following optimization of reaction parameters, including the type an‎d amount of catalyst, oxidant concentration, an‎d pH, it was found that the chromium-substituted polyoxometalate exhibited the highest catalytic efficiency, achieving maximum removal within 150 minutes. The ease of preparation, stability, reusability, reproducibility, an‎d the use of hydrogen peroxide, along with the suitable reaction time, were identified as key advantages of these substituted polyoxometalates in this study.

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