Improved carbon dioxide storage over clay-supported perhydroxylated glucodendrimer

Abstract

Low-cost biosourced hybrid microporous adsorbents with improved affinity towards carbon dioxyde (CO2) were prepared through the incorporation of various amounts of glucosylated dendrimer into bentonite- and montmorillonite-rich composite materials. Characterization by nitrogen adsorption–desorption isotherms, surface specific and pore size analyses (BET and BJH), thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD) revealed changes in the interlayer spacing and textural structure of the materials. Thermal programmed desorption measurements (TPD) showed significant improvements of the retention capacity of CO2 (CRC) and water (WRC). This was explained in terms of enhancement of both surface basicity and hydrophilic character due to the incorporation of terminal polyhydroxyl groups. The CRC was found to vary according to the previous saturation time with CO2 and the carrier gas throughput. CO2 was totally released upon temperature not exceeding 80 °C or even at room temperature upon strong carrier gas stream, thus providing evidence that CO2 capture involves almost exclusively physical interaction with the OH groups of the dendrimer. This result opens promising prospects for the reversible capture of carbon dioxide with easy release without thermal regeneration, more particularly when extending this concept to biosourced dendrimers.

Synthesis of exopolysaccharide-based organo-montmorillonite with improved affinity towards carbon dioxide and hydrophilic character

“…The intensity increase in the stretching vibration band of the free OH groups around 3604 cm −1 provides clear evidence of the incorporation of increasing number of OH groups in the clay structure [34]. The shift of this band towards 3654 cm −1 indicates that at least a part of the OH groups of EPS are involved in interactions with the inorganic support and water molecules [35]. The bands observed at 1220 and 1042 cm −1 were attributed to the asymmetric stretching of the siloxy group.…”

Applicability of Clay/Organic Clay to Environmental Pollutants: Green Way—An Overview

“…Nousir et al [141] modified bentonite and montmorillonite clay with perhydroxylated glucodendrimenr for CO 2 adsorption and CRC data revealed that CO 2 adsorption involves physical adsorption with the OH of the dendrimer. In the same year, Shah et al [27] conducted a study of the adsorption of CO 2 and NH 3 gas regarding cationic clay and anionic clay.…”

Insights into the metal retention role in the antibacterial behavior of montmorillonite and cellulose tissue-supported copper and silver nanoparticles

“…The basic strength accounts for CO 2 retention strength, and is proportional to the CO 2 desorption temperature. 30,[32][33][34][35][36][37][38][39][40][41][42][43][44][45][46] For this purpose, 45-50 mg of each material sample was prone to previous saturation with dry and O 2 -free CO 2 and then to a 5 C min À1 heating rate from 20 C to a given temperature threshold under 5 mL min À1 nitrogen stream. This temperature threshold was evaluated as the stability range through TGA by means of a TA Instruments TGA (Q500)/discovery MS equipment.…”