Mechanistic and Experimental Study of the Formation of MoS₂/HKUST-1 Core–Shell Composites on MoS₂ Quantum Dots with an Enhanced CO₂ Adsorption Capacity

Abstract

In this study, a new "one-pot" synthesis method was developed for the fabrication of HKUST-1 on MoS 2 quantum dots (QDs) to form a core−shell structure. It is proved that the HKUST-1 self-assembles on MoS 2 QDs to form a core−shell structure, which exhibits a high surface area of 1638.9 m 2 /g and enhances CO 2 uptake to 4.64 mmol/g as compared with HKUST-1 alone. The density functional theory (DFT) calculations revealed that the growth of HKUST-1 on MoS 2 QDs starts from the adsorption of Cu 2+ cations on the MoS 2 (001), followed by the Cu 2+ cations bonding with trimesic acid (TMA) anions. In addition, the interactions between a CO 2 molecule and the (MoS 2 + SBU) (secondary building unit = SBU) unit were studied using DFT calculations to show the mechanism of CO 2 adsorption on the MoS 2 /HKUST-1 core−shell composite. It is found that the MoS 2 QDs induce stronger electrostatic forces on CO 2 than HKUST-1 alone, which subsequently contributes to enhancing the adsorption of CO 2 on the MoS 2 /HKUST-1 core−shell composite.

Development of 2D MOF-Based Microrobots under Annealing Treatment and Their Biomedical Application

“…Compared with other traditional porous materials (silicon-supported salts, zeolites, metal oxides, covalent organic framework (COF), etc. ), the most notable features of MOFs are their tunable surface area, pore size, and metal center . These characteristics are directly related to the drug adsorption and release performance and resonate with the microrobot design in this workthat is, to tune and optimize the crystalline structures of the MOFs for drug adsorption, where uniform micropore structures can provide microenvironments for drug loading.…”

“…), the most notable features of MOFs are their tunable surface area, pore size, and metal center. 18 These characteristics are directly related to the drug adsorption and release performance and resonate with the microrobot design in this workthat is, to tune and optimize the crystalline structures of the MOFs for drug adsorption, where uniform micropore structures can provide microenvironments for drug loading. Furthermore, similar microrobots have been demonstrated for biomedical applications, 19,20 which provides the basis for microrobot concept in this work.…”

Recent Advances in Two-Dimensional MoS2 Nanosheets for Environmental Application

“…Various gaseous pollutants (e.g., NO 2 , NH 3 , SO 2 , CO 2 and CO) have caused more and more concerns, because of the severe damage to the ecoenvironment and human health. ,, The overuse of fossil fuels accelerated the air pollution of the environment. For instance, the combustion and burning of classical fuels is a major cause of global warming and air pollution. , The efficient techniques for the elimination and capture of these toxic gases from the aqueous environment using 2D MoS 2 has been attracting increased attention for the capture of these toxic gases. − Although most gases (e.g., NO, NO 2 , SO 2 ) are poorly adsorbed on the surface of monolayer MoS 2 , because of its charge acceptors (except the charge donor of NH 3 ), the vacancy sites of sulfur in S–Mo–S can significantly increase the sorption strength of all gas molecules in both 2H and 1T phases . Although the defective 1T MoS 2 monolayers cannot be doped, because of high dissociation barriers of the adsorbed gas and electron beam irradiation, 2H MoS 2 monolayers with an S vacancy can be doped using nonmetallic atoms (e.g., C, N, and O) at room temperature .…”

Impact of structure, doping and defect-engineering in 2D materials on CO2 capture and conversion

“…Recently, 2D materials such as graphene (or reduced graphene oxide (rGO)), [67][68][69][70][71][72] molybdenum disulphide (MoS 2 ), [73][74][75][76] h-BN, [77][78][79][80][81] MXenes, 33,82 2D MOFs & COFs, 8,21,83,84 g-C 3 N 4 , 85 phosphorenes, nanoclays, etc. (Fig.…”