Abstract
Metal–organic frameworks (MOFs) (Hong Kong University of Science and Technology (HKUST)-1) have been widely studied using the hydrothermal method. Recently, efforts have also been geared toward the incorporation of multiwalled carbon nanotubes (MWCNTs) into the HKUST-1 MOF to advance its applications for gas storage as well as pollutant removal in wastewater. However, a significant reduction in the MWCNT/HKUST-1 composite surface area has limited its applications. We therefore synthesized HKUST-1 and HKUST-1 impregnated with acid-treated multiwalled carbon nanotubes (FMWCNTs). A large surface area of 1131.2 m2g−1 was obtained after acid treatment of the as-received MWCNTs. HKUST-1 was found to have an average particle diameter of 6.5 to 8 µm with a BET surface area of 1176.66 m2g−1. The FMWCNT/HKUST-1 composites had a BET surface area of 1108.85 m2/g. The addition of FMWCNTs was found to increase the parent MOF pore volume from 0.76 to 1.93 cm3g−1. A BJH desorption cumulative pore size of 6.97 nm was obtained in a composite sample. The maximum adsorption capacity of the composites was found to be greater than 100 mg/g at 298 K. The results obtained indicate that FMWCNT/HKUST-1 nanocomposites are a potential adsorbent for methylene blue (MB) removal in dye synthetic water.
Highlights
Metal–organic frameworks (MOFs) have been found to be more versatile than any other class of porous material in applications
Micrograph of the functionalized multiwalled carbon nanotubes (MWCNTs) (FMWCNTs) used to synthesis the MOF–CNT composites in this work
In this work,6, 8, and we examined the effect of pH on methylene blue (MB) adsorption in FMWCNT/Hong Kong University of Science and Technology (HKUST)-1 at pH 2, 4, In order
Summary
Metal–organic frameworks (MOFs) have been found to be more versatile than any other class of porous material in applications This is due to their unique features, such as large surface areas with tunable porosities, open metal sites, and the ability to incorporate specific functionalities and active species without altering the frame topology [1,2,3]. These properties have made MOFs an outstanding material for gas storage, the capture of CO2 , and wastewater treatment [4,5]. We investigated the influence of the synthesis process on the crystal structure, surface area, pore volume, and pore size of the MWCNT/HKUST-1 composite, with potential applications in wastewater
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