Preparation of BiVO₄/MIL‐125(Ti) composite with enhanced visible‐light photocatalytic activity for dye degradation

Abstract

Because of their desired features, including very specific surface areas and designable framework architecture together with their possibility to be functionalized, Metal Framework (MOF) is a promising platform for supporting varied materials in respect of catalytic applications in water treatment. In this work, a novel visible-light-responsive photocatalyst that comprised BiVO 4 together with MIL-125(Ti), was synthesized by a two-step hydrothermal approach. The characterization of as-obtained samples as performed by X-ray diffraction, scanning electron microscopy, high resolution transmission electron microscopy, Fourier transform infrared spectroscope, X-ray photoelectron spectroscopy and ultraviolet-visible diffuse reflection spectra. Rhodamine B was selected being a target for the evaluation of the photocatalytic function of as-developed photocatalyst. The photocatalytic reaction parameters, for example, the content of BiVO 4 as well as initial concentration of Rhodamine B was researched. The composite photocatalyst possessing Bi:Ti molar ratio of 3:2 brought to light the fact that the greatest photocatalytic activity had the ability to degrade 92% of Rhodamine B in 180 min. In addition to that, the BiVO 4 /MIL-125(Ti) composite could keep its photocatalytic activity during the recycling test. The phenomenon of disintegration of the photogenerated charges in the BiVO 4 /MIL-125(Ti) composite was brought to discussion as well.

Visible-light-driven CQDs@MIL-125(Ti) nanocomposite photocatalyst with enhanced photocatalytic activity for the degradation of tetracycline

“…In the FT-IR spectrum of the CQDs, it is found that the strong absorption in the range of 3200-3400 cm À1 corresponds to the stretching vibration of -OH, which proves that the surface of the CQDs contains -OH. 23 Characteristic peaks for C-O, -COOH and -OH are observed at the same wavelength in CT-10, and the FT-IR spectroscopic results prove that the CQDs have been successfully anchored to MIL-125(Ti).…”

“…However, MIL-125(Ti) exhibits low absorption efficiency in visible light, quick reorganization of photogenerated electron-hole pairs, and disappointing photocatalytic ability, which connes its application to photocatalysis. 22 For the purpose of enhancing the photocatalytic performance of MIL-125(Ti), various MIL-125(Ti) composite photocatalysts have been prepared, such as BiVO 4 /MIL-125(Ti), 23 CdS/MIL-125(Ti), 24 MIL-125(Ti)/Ag/g-C 3 N 4 , 25 In 2 S 3 @MIL-125(Ti), 26 Ag/rGO/MIL-125(Ti), 22 Ag@MIL-125(Ti) 27 and so on. However, there is still a need to discover more appropriate semiconductor materials for the preparation of MIL-125(Ti) heterojunctions.…”

“…Thus, the introduction of carbon quantum dots into MOFs not only increases the absorption of visible light but also adds new active sites to the MOF materials. 23 Herein, CQDs@MIL-125(Ti) photocatalysts were synthesized using a facile one-pot solvothermal procedure by varying the mass percentage of CQD. The prepared materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Xray photoelectron spectroscopy (XPS), Fourier-transform infrared (FT-IR) spectroscopy, Raman spectroscopy and nitrogen adsorption-desorption measurements.…”

Synthesis of a semi-conductor-like MOF with black phosphorous as a composite for visible light-driven photocatalysis

“…The teraphthalic acid ligand makes MIL-125(Ti) Raman active and this evidenced by the bands indexed at 1618, 1455, 1181 and 1138 cm À1 which relate to the in-plane vibrational modes of the aromatic rings, whereas bands centered 865 and 641 cm À1 represent the vibrational modes of the C-H and C]C bonds of the aromatic rings. 10,21,25 The variation for the Raman peaks further affirmed the successful synthesis of MIL-125(Ti). The Raman bands indexed at 363, 444 and 462 cm À1 corresponding to A 1 g , B 2g and A 2 g Raman modes of FLBP as shown in Fig.…”

The proton conductivities of two silver‐thiophene‐2‐carboxylate coordination polymer and the relationship between the dimensionality and properity

“…Nowadays, coordination polymers (CPs) and metal–organic frameworks (MOFs) have demonstrated their superiority in gas storage/separation, luminescence, electronic conduction, catalysis, and other fields of application stemming from the high surface areas and designable structures with specific host‐guest chemistry. As a relatively new type of conducting materials, CPs/MOFs have potential applications acting as proton‐conducting materials from the high ordered structures, modular building blocks and a wide design latitude of frameworks by choosing various metal ions and bridging ligands …”