Recent Progress in Chitosan-Containing Composite Materials for Sustainable Approaches to Adsorption and Catalysis

Abstract

In recent years, composite materials including organic–inorganic systems have drawn special attention due to their enhanced properties such as adsorbents and heterogeneous catalysts. At the same time, large-scale production of environmentally benign functionalized biopolymers, such as chitosan (CS), allows for constantly developing new materials, since CS reveals remarkable properties as a stabilizing agent for metal-containing compounds and enzymes and as an adsorbent of organic molecules. This review is focused on CS-based materials and on the composite systems including CS–oxide and CS–metal composites in particular for application as adsorbents and supports for catalytically active metal nanoparticles and enzymes.

Magnetic Nanoparticle Support with an Ultra-Thin Chitosan Layer Preserves the Catalytic Activity of the Immobilized Glucose Oxidase

“…Magnetically recoverable biocatalysts, i.e., enzymes immobilized on magnetic supports, receive considerable attention due to the important advantages of such catalysts compared to native enzymes or enzymes immobilized on nonmagnetic supports (see recent reviews [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 ]). Like all immobilized enzymes, they allow for higher stability during catalytic reactions and broader temperature and pH stability ranges [ 15 , 16 , 17 , 18 , 19 ].…”

“…Unlike silica-NH 2 treatment, coating magnetic NPs with functional polymers (i.e., polymers containing functional groups) can provide a much higher functional group density in one step via polymer deposition on the NP surface. Among functional polymers, significant attention has been paid to chitosan (CS)—a natural polymer obtained from chitin (biomass) [ 8 , 35 , 36 , 37 , 38 , 39 ]. It was reported that the CS coating of maghemite NPs can be carried out by different methods.…”

Supramolecular Pd@methioine-EDTA-chitosan nanocomposite: an effective and recyclable bio-based and eco-friendly catalyst for the green Heck cross-coupling reaction under mild conditions

“…[75][76][77][78][79][80][81][82][83][84][85][86][87][88] Chitosan now plays a vital role in different elds, including medicine, drug delivery, food packaging, cosmetics, water treatment, membranes, fuel cells, hydrogels, adhesives, and surface conditioners. [89][90][91][92][93][94][95][96][97] Indeed, the NH 2 groups with high chelating ability as well as the proper geometry of neighboring OH groups in the chitosan scaffold along with its insolubility in the majority of organic solvents and water make it the best candidate for using in the preparation of robust supramolecular heterogeneous catalysts by both academia and the chemical industry, especially in the pharmaceutical sector. Therefore, pristine chitosan and its modied structures have received considerable attention in various catalytic systems for different organic transformations.…”