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WO3 in suit embed into MIL-101 for enhancement charge carrier separation of photocatalyst.

ABSTRACT: Compositing nanoparticles photo-catalyst with enormous surface areas metal-organic framework (MOF) will greatly improve photocatalytic performances. Herein, WO3 nanoparticles are partly embedded into pores of MIL-101 or only supported on the outside of representative MIL-101, which were defined as embedded structure WO3@MIL-101@WO3 and coating structure WO3&MIL-101 respectively. Different pH, concentration and loading percentage were researched. XRD, TEM and BET were carried to analyze the composites. Compared with the pristine WO3, all WO3 loaded MOF nanocomposites exhibited remarkable enhancing for the efficiency of photocatalytic degradation methylene blue under visible light. Their activity of the same loading percentage WO3 in embedded structure and coating structure have increased for 9 and 3 times respectively compared with pure WO3. The WO3@MIL-101@WO3 has 3 times higher efficiency than WO3&MIL-101, because the shorter electron-transport distance can make a contribution to electron-hole separation. The further mechanism involved has been investigated by radical quantify experiment, XPS and photoluminescence spectroscopy.

SUBMITTER: Wang L

PROVIDER: S-EPMC6425017 | biostudies-literature | 2019 Mar

REPOSITORIES: biostudies-literature

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WO3 in suit embed into MIL-101 for enhancement charge carrier separation of photocatalyst.

Wang Linjuan L Zan Ling L

Scientific reports 20190319 1

Compositing nanoparticles photo-catalyst with enormous surface areas metal-organic framework (MOF) will greatly improve photocatalytic performances. Herein, WO3 nanoparticles are partly embedded into pores of MIL-101 or only supported on the outside of representative MIL-101, which were defined as embedded structure WO3@MIL-101@WO3 and coating structure WO3&MIL-101 respectively. Different pH, concentration and loading percentage were researched. XRD, T ...[more]

PMID: 30890746

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Project description:In this study, hybrids of nanoporous MIL-101(Cr) and MIL-53(Al) were synthesized using a hydrothermal method for various time periods, ranging from 8 to 40 h. The prepared materials were characterized by powder X-ray diffraction (PXRD) and elemental analysis, and their specific surface areas were measured by N2 sorption at 77 K using the Brunauer-Emmett-Teller (BET) method. To investigate the practical application of these materials, the pure carbon dioxide and methane adsorption capacities of the samples were determined using the volumetric method. The Langmuir model was used to fit the CO2 and CH4 isotherms. Extended Langmuir (EL) equations and the ideal adsorbed solution theory (IAST) models were used to obtain the CO2/CH4 selectivity. The sample with the highest BET specific surface area was selected as a candidate for further investigations. The thermal stability of the selected sample was investigated by thermogravimetric analysis (TGA). Scanning electron microscopy (SEM) was used to characterize the sample morphology. XRD results showed that the sample synthesized over the shortest time corresponded to MIL-101(Cr), while the sample synthesized over the longest time was in agreement with MIL-53(Al). Samples synthesized for time periods between these two limits were assumed to be composites of both MIL-53(Al) and MIL-101(Cr). TGA results indicated that the hybrid materials were thermally stable at temperatures about 100 °C higher than for pure MIL-101(Cr). The BET specific surface area (1746 m2 g-1) and CO2 adsorption capacity (16 mmol g-1) of the selected hybrid sample were about 50% and 35% higher, respectively, compared with those of pure MIL-53(Al), but 30% and 20% lower, respectively, compared with those of pure MIL-101(Cr). Binary adsorption modeling showed the high selectivity of the MIL-101(Cr) and MIL-53(Al) hybrid material for CO2 with a minimum separation factor of about 60 at 298 K. This value was much higher than those reported previously and those observed in this work for the original MIL-101(Cr) or MIL-53(Al). These results demonstrated that the hybrid of MIL-101(Cr) and MIL-53(Al) was a promising material for selective CO2 capture from natural and biogas.

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WO3 in suit embed into MIL-101 for enhancement charge carrier separation of photocatalyst.

Publications

WO<sub>3</sub> in suit embed into MIL-101 for enhancement charge carrier separation of photocatalyst.

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