Synthesis and Charaterization of Silica-Based Aldehyde Chitosan Hybrid Material for Biodiesel Purification

Abstract

This study concerns the development and charaterization of Silica-based aldehyde Chitosan hybrid material as an adsorbent for biodiesel purification. This biocomposite was prepared by sol-gel route and oxidation with periodate, and then characterized. FTIR experiments showed that the hybrid formed presents absorption bands similar to those of Chitosan-Silica, with the exception of the vibrations at 1480 cm−1 and 1570 cm−1 attributed to the symmetrical angular deformation in the N-H plane, and possess large N2 Brunauer–Emmett–Teller (BET) surface areas. Thermogravimetric analysis (TG) and scanning electron microscopy (SEM) was also carried out. Adsorption studies of bioadsorbents involving the analysis of free glycerol, soap, acidity, diglycerides, triglycerides, and fluorescence spectroscopy showed that silica-based aldehyde chitosan has a good affinity for glycerol and a good purification process.

Effects on the Mechanical Properties of Nacre-Like Bio-Hybrid Membranes with Inter-Penetrating Petal Structure Based on Magadiite

“…Like the result of the XRD analysis, the MAG layers in the CS/KH550/MAG hybrid membranes were inserted more completely and deeply than those in the CS/MAG hybrid membranes, and the layered spacing of the CS/KH550/MAG hybrid membranes was much larger compared to the CS/MAG hybrid membranes. From the angle of the microstructure, the interfacial compatibility between the MAG layer and the CS molecular chain was significantly enhanced after adding the KH550 and which was made the CS reaction to insert in the molecular chains [25].…”

“…Second, there was an effect of cementing action from the organic substrate. The organic matrix like the CS bonded closely together with MAG layers through the chemical bonds, hydrogen bonds, or electrostatic forces [25]. When the hybrid membranes were suffering the plastic deformation, on the one hand, a large number of chemical bonds and hydrogen bonds would be destroyed and restructured during the MAG layers sliding out, and the effect of cementing action from the organic substrate would improve the slip resistance, effectively maintaining the “interpenetrating petals” layered structure inside the hybrid membranes, and delaying the fracture time [26].…”

“…Abba [24] integrated CS and Al 2 O 3 sheets to form thin films with nacre-like brick-and-mortar structure using manual shear casting. The enhanced mechanisms of performance of nacre-like structure materials is related to the complex interaction force between the aforementioned “brick-and-mortar” [25]. Huang’s research group [26] researched the hierarchical structure of nacre-like materials and summarized various enhancement mechanisms to design interfacial interactions between different brick-and-mortar materials.…”

Investigation of the Efficiency of Wet Biodiesel Purification

“…Their specific surface area of absorption is 180-200 m 2 / g, and other parametersas in silica gel [13, p. 562-563]. In papers [14] and [15], satisfactory purification of biodiesel by silica gel is noted; in [16] more efficient treatment of biodiesel with silica gel compared with the washing of biodiesel with hot distilled water.…”

Preparation and Enrichment Properties of Magnetic Dodecyl Chitosan/Silica Composite for Emerging Bisphenol Contaminants

“…Compared with the self-cross-linking, more researchers focused on compositing chitosan with other distinctive materials like bentonite [ 19 ], active charcoal [ 20 ], and polymer [ 21 ]. Among various chitosan composites, the compositing of chitosan with silica can improve more efficiently the phy-chemical properties of chitosan-based composites including the mechanical stability, porous structure, specific surface area, as well as high biocompatibility [ 22 , 23 ]. Various silicon alkoxide with active groups can be chosen as the precursors of silica components to modify the characteristic of chitosan/silica composites [ 24 ].…”