Covalent Triazine Framework Modified BiOBr Nanoflake with Enhanced Photocatalytic Activity for Antibiotic Removal

Abstract

The development of photocatalysts based on covalent organic frameworks (COFs) is intriguing research due to their structural flexibility and tremendous catalytic sites. Herein we demonstrate a facile strategy to prepare composite materials of combined COFs and inorganic semiconductors with enhanced photocatalytic performances. A new composite photocatalyst (BiOBr/CTF-3D) integrated three-dimensional (3D) covalent triazine framework (CTF-3D) with two-dimensional BiOBr nanoflake was prepared via a simple coprecipitation method. The structural characterizations demonstrated that the amorphous CTF-3D was well modified on the surfaces of BiOBr. The photocatalytic activity of the BiOBr/CTF-3D composite was evaluated by the degradation of colorless antibiotic agents, tetracycline hydrochloride (TC) and ciprofloxacin (CIP), under visible light irradiation. When the mass percent of CTF-3D was 2%, the BiOBr/CTF-3D composite displayed the highest photocatalytic activity. The enhancement of photocatalytic performance was mainly derived from the enlarged optical adsorption range, the efficiently separated photogenerated electron−hole pairs, and the accelerated adsorption and transfer of antibiotic molecules, in the synergistically facilitating photocatalytic process. In addition, a possible photocatalytic mechanism for degrading TC by BiOBr/ CTF-3D-2% was tentatively proposed. This work opens up a new strategy to improve the photocatalytic activity of traditional inorganic photocatalysts by modification with COFs materials for solving the pollution of living ecosystems.

Graphene-Analogue Boron Nitride Modified Bismuth Oxyiodide with Increased Visible-Light Photocatalytic Performance

“…From the figure, it can be seen that the photocurrent value of the BiOI and 3 wt% BN‐BiOI material is about 0.06 and 0.10 µA, respectively, and the photocurrent intensity of the samples have no significant changes with the illumination time. This results manifest that the BN‐BiOI catalyst has a lower electron–hole recombination rate, faster electron transfer rate, enhanced photocurrent value, and photocatalytic activity . These results further confirms the composites own better activity in the photocatalytic degradation of MO.…”

The synthesis of a BiOClxBr1−x nanostructure photocatalyst with high surface area for the enhanced visible-light photocatalytic reduction of Cr(vi)

“…19 To further improve the photocatalytic efficiency, BiOBr has been coupled with other semiconductors either to extend the light absorption range or to increase the separation efficiency of the photoinduced carriers. Some BiOBr-based composites have been reported including BiOBr/g-C 3 N 4 , 26,27 BiOBr/CeO 2 , 28 Bi 2 MoO 6 /BiOBr, 29 Bi 2 WO 6 /BiOBr, 30 CdS/ BiOBr, 31 BiOBr/BiOI, 32 and BiOCl/Bi 2 S 3 . 33 Recently, BiOBr was coupled with low cost, chemically stable BiOCl and improved photocatalytic performances were achieved.…”

Mechanism to Enhance Visible-light-driven Photocatalysis of Flower-like Composite of AgI Nanoparticle/BiOI Nanosheet

“…Obviously, the photocatalytic process of the organic pollutants MO and CBB adheres to the apparent pseudo-first-order kinetics 27 . The kinetic photocatalytic degradation of all the two dyes was studied by using the follow equation 5:…”