Biaril Bileşiklerinin Sentezi İçin Kitosan-Guar Sakizi Kompoziti İçeren Biyobozunur Mikrokapsüller Üzerine İmmobilize Edilmiş Oldukça Aktif ve Sağlam Paladyum Nanopartiküller

Year 2020, Volume: 8 Issue: 1, 113 - 121, 05.03.2020

Talat Baran

https://doi.org/10.36306/konjes.698694

Cited By: 1

Abstract

Bu çalışmada, kitosan-guar sakızı kompozitinden (CS-GG) oluşan son derece kararlı biyobozunur mikro kapsüller, katalizör desteği olarak hazırlandı. Daha sonra, paladyum partikülleri, herhangi bir toksik indirgeyici madde kullanmadan tasarlanan destek üzerine başarıyla dekore edildi (Pd NP@CS-GG). CS-GG ve Pd NP@CS-GG’lerin yapısal karakterizasyonu farklı analitik tekniklerle yapıldı ve paladyum nanopartiküllerinin boyutunun 23-48 nm aralığında değiştiği tespit edildi. Daha sonra, Pd NP @ CS-GG'nin katalitik aktivitesi, mikrodalga ısıtma kullanılarak çözücüsüz ortam altında çeşitli biaril bileşiklerin üretiminde değerlendirildi. Pd NPs@CS-GG, çeşitli aril halojenürlerin iyi reaksiyon verimleriyle istenilen biaril bileşiklerine dönüştürülmesinde yüksek katalitik performans gösterdi. Ayrıca, Pd NPs@CS-GG'nin, en az yedi kez tekrar kullanımı nedeniyle uzun yaşam süresine sahip bir katalizör olduğu bulundu.

Keywords

Kitosan, Mikro Kapsül, Katalizör, Paladyum Nanopartikül

HIGHLY ACTIVE AND ROBUST PALLADIUM NANOPARTICLES IMMOBILIZED ON BIODEGRADABLE MICROCAPSULES CONTAINING CHITOSAN-GUAR GUM COMPOSITE FOR SYNTHESIS OF BIARYL COMPOUNDS

Abstract

In this study, highly stable biodegradable microcapsules, which are composed of chitosan-guar gum composite (CS-GG), were prepared as catalyst support. Then, palladium nanoparticles were successfully decorated on the designed support without using any toxic reducing agent (Pd NPs@CS-GG). Structural characterizations of CS-GG and Pd NPs@CS-GG were carried out by different analytical techniques and it was detected that the size of palladium nanoparticles changed in the range of 23-48 nm. Then, the catalytic activity of Pd NPs@CS-GG was evaluated in the fabrication of various biaryl compounds under solventless media using microwave heating. Pd NPs@CS-GG showed high catalytic performance in the conversion of various aryl halides to desired biaryl compounds with good reaction yields. Moreover, it was found that Pd NPs@CS-GG was a catalyst having long life time because of its reuse at least seven times.

Keywords

Chitosan, Microcapsule, Catalyst, Palladium Nanoparticle

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