Covalent organic frameworks (COFs) exhibit visible-light activity for the degradation of organic pollutants. However, the recombination rates of their photoinduced electron− hole pairs are relatively high, limiting their practical application. In this work, we fabricated a 1,3,5-triformylphloroglucinol (Tp) and p-phenylenediamine (Pa-1) (TpPa-1) COF-based heterojunction through coupling the TpPa-1 COF with a ZnAgInS nanosphere via a facile oil bath heating method. The results show that the prepared heterojunction exhibits outstanding catalytic activity for the degradation of high concentrations the antibiotic tetracycline (TC) and the dye rhodamine B (RhB), which is driven by simulated sunlight. Its degradation rates for RhB and TC were 30× and 18× higher than that of the pure TpPa-1 COF, respectively. The greatly enhanced photocatalytic performances can be ascribed to the formed heterojunction with good band-gap match, which promotes the migration and separation of light-induced electrons and holes and increases both light absorbance and the specific surface area. This study introduces an effective and feasible strategy for improving the photocatalytic performances of COFs via subtly integrating TpPa-1 COFs with a ZnAgInS nanosphere into an organic−inorganic hybrid. The results of the photocatalytic experiments indicate that the fabricated hybrid has a potential application in the highly efficient removal of organic pollutants.
As a promising catalyst, MoS2 has been widely
studied
owing to its high chemical reactivity, excellent electrical carrier
mobility, good optical properties, and narrow band gap. However, the
high recombination rate of photoinduced charge carriers limits its
practical application in photocatalysis. In this study, MoS2 was coupled with PANI to fabricate an S-scheme heterojunction MoS2/PANI. The synthesized products were characterized systematically,
and their photocatalytic properties were evaluated by photocatalytic
degradation of norfloxacin (NOR) and rhodamine B (RhB). The obtained
results indicated that the fabricated MoS2/PANI inorganic–organic
heterojunction displayed tremendously enhanced photocatalytic activity.
The degradation efficiencies for 60 mg L–1 of NOR
and RhB are 86 and 100% under the simulated sunlight irradiation for
1 h with 10 mg of catalyst, which are 13 and 47 times higher than
those of pure MoS2, respectively. Interestingly, it is
superior to the previously reported related materials. The remarkably
enhanced photocatalytic activity of MoS2 is assigned to
the high charge conductivity feature of PANI and the formed S-scheme
heterojunction that result in a steric separation of holes and electrons
and conserve the initial powerful redox ability of the parent catalysts.
This study provides a facile method to greatly improve the photocatalytic
activity of MoS2 and facilitates its application for highly
efficient removal of organic pollutants, such as antibiotic drugs
and organic dyes, utilizing solar energy.
Norfloxacin (NOR) and tetracycline (TC), two widely used
antibiotic drugs released to the aquatic environment, induce harm
to ecosystems. In this study, an effective method was developed successfully
to remove NOR and TC by photocatalysis with a novel heterojunction
NC/NH2-MIL-53(Fe), which was fabricated by combining a
metal–organic framework (MOF) material (NH2-MIL-53(Fe))
and N-doped carbon (NC) nanoparticles via a facile solvent thermal
method. The prepared product exhibits outstanding photocatalytic efficiencies
toward degradation of NOR and TC that are 15 and 6 times higher than
those of pure NH2-MIL-53(Fe), respectively. Moreover, it
is higher than those of the related materials reported previously.
The greatly enhanced photocatalytic performance is assigned to the
fabricated heterojunction with well-matched energy band gaps, where
the NC acts as an efficient electron transfer/reservoir material to
effectively promote the migration and transfer and restrain the recombination
of charge carriers. In addition, the formed heterojunction increases
specific surface area and light absorbance. The photocatalytic activity
enhanced mechanism, degradation products, and pathway were investigated.
The present study offers a novel strategy to significantly improve
the photocatalytic performances of MOFs for highly efficient photocatalytic
removal of antibiotic drugs in wastewater.
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