Synthesis and Characterization of an SWCNT@HKUST-1 Composite: Enhancing the CO₂ Adsorption Properties of HKUST-1

Abstract

Synthesis of a new HKUST-1 composite based on single-walled carbon nanotubes (SWCNTs) was successfully achieved (SWCNT@HKUST-1). SWCNTs were used as templates to grow rod-like HKUST-1 crystals over the surface of the nanotubes. N 2 adsorption properties showed an increment on the surface area and pore volume for the SWCNT@HKUST-1 composite. Furthermore, the CO 2 capture increased, from 7.92 to 8.75 mmol g –1 at 196 K up to 100 kPa, for the SWCNT@HKUST-1 composite. This enhancement was directly associated with the increase of the surface area of the composite. Additionally, an increase in the CO 2 heat of adsorption was estimated, from 30 to 39.1 kJ mol –1 for the SWCNT@HKUST-1 composite. In situ Raman experiments corroborated the favored CO 2 adsorption for the composite and provided an insight into the augmented hydrophobicity of the SWCNT@HKUST-1. Ethanol adsorption isotherms corroborated an increase in the hydrophobicity of the material upon the incorporation of carbon nanotubes.

A Cu(ii)-MOF based on a propargyl carbamate-functionalized isophthalate ligand

“…The signals located at 1605 and 1004 cm À1 are associated with the benzene ring n(C]C) stretching modes, whereas the peaks at 807 and 745 cm À1 are ascribed to out-of-plane d(C-H) and d(C]C) ring bending vibrations, respectively. 32,33 In the lowfrequencies region (600-200 cm À1 range), [Cu(1,3-YBDC)]$ xH 2 O exhibits, in agreement with previous studies, two peaks at 495 and 276 cm À1 , respectively assigned to the vibrational stretching modes of equatorial and axial Cu-O bonds. 34,35 The elemental analysis of the synthesized sample is in good agreement with the theoretical chemical composition, showing a Cu/N molar ratio of ca.…”

Synthesis of Mesoporous MWCNT/HKUST-1 Composite for Wastewater Treatment

“…These properties have made MOFs an outstanding material for gas storage, the capture of CO 2 , and wastewater treatment [4,5]. Among these MOFs, the Hong Kong University of Science and Technology (HKUST)-1 MOF has been widely studied for energy-related applications [6]. Recently, the HKUST-1 MOF has also received significant attention in wastewater treatment due to its distinct properties [7].…”

Statistically Optimum HKUST-1 Synthesized by Room Temperature Coordination Modulation Method for the Adsorption of Crystal Violet Dye

“…it will differ in physical and chemical characteristics. As evidence, HKUST-1 has various morphologies due to different synthesis conditions, such as octahedrons [14], cubes [13], cuboctahedrons [40], hexagonal polyhedrons [23], rod-like shapes [21], irregular-layered sheets [43], agglomerates [11], or even monoliths [12]. This uncertain morphology can be overcome by the coordination modulation method using additional modulators or chemicals to maintain crystal growth of HKUST-1, such as acetic acid [44,45], nitric acid [46,47], sodium bicarbonate [13,48], sodium acetate, sodium formate, and triethylamine [49].…”