One-pot synthesis of metal–organic framework@SiO2 core–shell nanoparticles with enhanced visible-light photoactivity

Abstract

This paper presents a novel strategy to prepare Cu3(BTC)2@SiO2 core-shell nanoparticles in the size range of 200-400 nm using a new one-pot strategy under ultrasonic irradiation at room temperature. In this approach, the silica shell thickness could be finely tuned in the size range of 12-60 nm for various reaction times. Nanocomposite thin films were fabricated on the glass substrates by Sol-Gel spin coating using the products for 1.5 h, 2 h and 2.5 h, respectively, and heat treated using an infrared lamp heating system in air. The photocatalytic degradation of phenol in aqueous solution using Cu2(BTC)3@SiO2 thin films was investigated under visible light irradiation at pH 4. After a 45 min reaction with phenol, the degradation rate was up to 93.1%. Moreover, the thin film photocatalysts could be reused 5 times without appreciable loss of photocatalytic activity for degradation of phenol. The present work clearly shows that the films as photocatalysts showed higher photocatalytic performance.

Enhanced Adsorption of Methylene Blue and Congo Red from Aqueous Solutions by MCM-41/HKUST-1 Composites

“…This indicated that the addition of MCM-41 did not affect the crystal structure formed [22], however the intensity of the composite decreased with the addition of MCM-41. This was possible because the amorphous MCM-41 structure may affect the crystallinity of HKUST-1 [23].…”

“…The absorption band around 727 cm -1 indicated stretching vibration of Cu-O, in which the oxygen atom in ligand BTC was coordinated with Cu [21]. Another typical absorption band from HKUST-1 also appeared in regions 1640, 1447 and 1368 cm -1 which showed the stretching of the C-O group, vibration of the OH group and stretching vibration of the C=O group derived from the carboxylic group [23]. Water molecules bonding in HKUST-1 was found in absorption peak around 3245 cm -1 [9].…”

Metal organic frameworks for adsorption-based separation of fluorocompounds: a review

“…Metal organic frameworks (MOFs) are a novel class of hybrid materials, which are composed of metal units attached together covalently by organic linkers to form architecturally stable structures with permeant porosity. So far, MOFs have shown enormous potential applications in gas storage, 9,10 separation, [11][12][13][14][15][16] catalysis, [17][18][19][20] sensing, 21 drug delivery etc. For gas adsorption and separation, via the interplay of both metal-containing clusters and organic linkers, the pore size of MOFs can be tuned to induce steric effects, while their pore surfaces can be functionalized to enhance their different interactions with gas molecules during equilibrium separation.…”

Microwave assisted synthesis of reduced graphene oxide incorporated MOF-derived ZnO composites for photocatalytic application

“…Metal-organic frameworks (MOFs) with high specific surface areas and tunable porous sizes have attracted considerable attention due to their potential applications in sensors, catalysis, separation, gas storage, electrochemical and photochemical devices [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. Recently, many researches have demonstrated that metal oxides with porous structure (such as TiO 2 and ZnO) can be easily prepared via simple heat treatments of MOFs precursors under a variety of atmospheric gaseous conditions as photocatalysts to enhance the photocatalytic performance [25,26].…”