Boosting the Adsorption Performance of Thiophenic Sulfur Compounds with a Multimetallic Dual Metal–Organic Framework Composite

Abstract

Adsorptive desulfurization over metal−organic frameworks (MOFs) remains a challenge in maintaining good performance in the presence of water. Herein, multimetallic Fe/ Ni/Cu/Zn-(MIL-88B)-on-(MOF-5) is first achieved through phase-competition-driven growth technology. The adsorption performance of thiophene (Th), benzothiophene (BT), and dibenzothiophene (DBT) in model fuels is systematically investigated at mild temperature and follows the order Fe/Ni/Cu/Zn-(MIL-88B)-on-(MOF-5) > MOF-5 > MIL-88B. Excellent adsorptive activity is mainly ascribed to the associative effects of multimetal active sites, suitable pore sizes and shapes, acid−base interactions, and complexation. Meanwhile, MIL-88B exhibits a "brick-wall" effect and effectively enhances the water stability of Fe/Ni/ Cu/Zn-(MIL-88B)-on-(MOF-5) more than does MOF-5. Fe/Ni/Cu/Zn-(MIL-88B)-on-(MOF-5) exhibits superior stability even after being immersed in water for 5 days, maintaining 77, 77, and 81% of the initial DBT, BT, and Th uptake capacities. After five periods of regeneration, more than 90% of the desulfurization capacity of Fe/Ni/Cu/Zn-(MIL-88B)-on-(MOF-5) was recovered. This work provides a new strategy for the synthesis of desirable MOF-on-MOF, promoting its potential application to adsorption desulfurization.

Enhanced adsorption capacity of tetracycline on porous graphitic biochar with an ultra-large surface area

“…It indicates that intra-particle diffusion is not the controlling factor affecting adsorption in the kinetic process. 48 …”

“…It indicates that intra-particle diffusion is not the controlling factor affecting adsorption in the kinetic process. 48 3.2.2 Adsorption isotherm. Four well-known models, Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich were applied to describe the adsorption isotherm (Fig.…”

Recent trends on MIL-Fe metal–organic frameworks: synthesis approaches, structural insights, and applications in organic pollutant adsorption and photocatalytic degradation

“…251,252 For instance, amine-modified MIL-88B(Fe) strongly adsorbs 163.66 mg g −1 2,4,6-trinitrophenol (TNP) from the water phase, the hydrogen bonding between the NH 2 -MIL-88B and TNP was the major reason for the enhanced adsorption efficiency and structure stability. 253 Recently, Fang and his team 254 developed a multi-metallic structure (Fe/Ni/Cu/Zn-(MIL-88B)-upon-(MOF-5)) through a phase competition-driven growth technique (Fig. 10a).…”

Fe3O4@ZIF-8@SiO2 Core–Shell Nanoparticles for the Removal of Pyrethroid Insecticides from Water

“…Zeolitic imidazolate framework-8 (ZIF-8) is a MOF with a unique pore structure, a superior specific surface area, abundant active sites, and excellent water stability. , The most attractive feature of ZIF-8 is its remarkable dispersibility in water, which can prolong its suspension time and contact area in water . Therefore, ZIF-8 can be combined with Fe 3 O 4 nanoparticles to form composite nanoparticles with good dispersibility and adsorption capacity .…”