Synthesis and CO₂ Adsorption Properties of Molecularly Imprinted Adsorbents

Abstract

A series of molecularly imprinted adsorbents of CO(2) were developed by molecular self-assembly procedures, using ethanedioic acid, acrylamide, and ethylene glycol dimethacrylate as template, functional monomer, and cross-linker, respectively. Textural properties of these adsorbents were characterized by N(2) adsorption experiment, thermo-gravimetric analysis, and Fourier transform infrared spectroscopy. CO(2) adsorption capacities of adsorbents were investigated by thermo-gravimetric balance under 15% CO(2)/85% Ar atmosphere. Adsorption selectivity of CO(2) was studied by fixed-bed adsorption/desorption experiments. All the adsorbents displayed good thermal stability at 200 °C. Among them, MIP1b, with the higher amine content, exhibited the largest CO(2) capacity, which maintained steady after 50 adsorption-desorption cycles. Although MIP3 showed the highest specific surface, the CO(2) capacity was lower than that of MIP1b. CO(2) adsorption mechanism of molecularly imprinted adsorbents was determined to be physical sorption according to the adsorption enthalpies integrated from the DSC heatflow profiles. The calculated separation factors of CO(2) under 15% CO(2)/85% N(2) atmosphere were above 100 for all adsorbents.

Production of molecularly imprinted polymer particles with amide-decorated cavities for CO 2 capture using membrane emulsification/suspension polymerisation

“…Compared to MIP particles synthesised by bulk polymerisation that follow a type II adsorption isotherm with an average pore size of 10-24 nm [23], the pore size distribution of the sample in Fig. 8 was considerably narrower with a smaller average pore size.…”

“…However, they 21 display a low selectivity for CO 2 over N 2 due to the physisorption mechanism of CO 2 capture 22 [2]. One of the main drawbacks of highly porous materials such as activated carbon and 23 MOFs is their low density, which can limit their application in fluidised bed systems [15,16]. 24 Physical impregnation or covalent tethering of amines inside mesopores is an effective way 25 of increasing both CO 2 capture capacity and selectivity of porous CO 2 adsorbents [17,18].…”

“…28 Polymer-based materials, such as hyper cross-linked polymers (HCPs), porous aromatic 29 frameworks (PAFs), and covalent organic polymers (COPs) are new classes of CO 2 30 adsorbents characterised by a high CO 2 selectivity and capture capacity, high hydrothermal 31 stability and ease of surface modification [20][21][22]. Acrylamide-based molecularly imprinted 32 polymer (MIP) particles for CO 2 capture with a separation factor of up to 340 at a CO 2 partial 33 pressure of 15 kPa have been fabricated using bulk polymerisation [23]. MIPs contain 34 inherently functionalised nanocavities, which are complementary in shape to the target 35 molecule, and can act as active sites for capturing the target molecules (Fig.…”

“…1). Unlike amine 36 impregnation or tethering, which often leads to reduction in the total pore volume and 37 specific surface area of the particles [24], molecular imprinting increases porosity of the 38 particles, leading to a higher rate of diffusion of CO 2 to active sites [23,25]. 39 However, bulk polymerisation is not suitable for large-scale production, because the resulting 40 bulk polymer must be crushed, ground, and sieved to obtain particles of optimum size, which 41 is time-consuming, laborious, and expensive, as only 30-40% of the particles can be 42 recovered.…”

Biomedical Waste Management of Mercury using Advanced Polymeric Materials: Application of MIP - Sieve Sensor

“…For Gases, more surface area is required. Large catalytic converter style filters can be made to maximize contact between the gas molecules and the filter itself [6].…”