Chitosan-starch biopolymer modified kaolin supported Pd nanoparticles for the oxidative esterification of aryl aldehydes


Veisi H., Ebrahimi Z., Karmakar B., Joshani Z., Öztürk T.

INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES, vol.191, pp.465-473, 2021 (Journal Indexed in SCI) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 191
  • Publication Date: 2021
  • Doi Number: 10.1016/j.ijbiomac.2021.09.106
  • Title of Journal : INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
  • Page Numbers: pp.465-473
  • Keywords: Biopolymer, Pd nanoparticles, Esterification of aldehydes, IRON-OXIDE NANOPARTICLES, CATALYTIC-REDUCTION, GREEN SYNTHESIS, RECYCLABLE NANOCATALYST, HETEROGENEOUS CATALYST, SILVER NANOPARTICLES, EFFICIENT CATALYST, ALCOHOLS, EXTRACT, 4-NITROPHENOL

Abstract

A mild and efficient green protocol has been disclosed for selective oxidative esterification of various aldehydes over a novel Pd fabricated chitosan-starch polyplex encapsulated Kaolin (Kaolin@CS-starch-Pd) as a heterogeneous and reusable biocompatible nanocatalyst. Molecular oxygen was used as an oxidizing agent to generate water as the sole by-product. A wide variety of aldehydes was converted to their methyl esters in high yields. The process involved gentle reaction conditions to avoid any type of pre-activation. Structural features of the catalyst were determined through FT-IR, FE-SEM, TEM, EDX, elemental mapping, XRD and ICP-OES analyses. The material was found to be stable enough toward Pd leaching. Durability of Kaolin@CS-starch-Pd was further justified by retaining its catalytic activity through successful reusability for several times.