Hybrid nanomaterials have been produced using a combination of core−shell synthesis, 3D printing, and plasma grafting. Metal oxides, that is, ZnO and TiO 2 , as well as iron-based metal organic frameworks (Fe-MOF) nanoparticles were grafted permanently onto the surface of 3D-printed fractal substrates via cold plasma discharge (CPD). The aim is to produce supported photocatalysts for the degradation of organic pollutants in water. Herein, different plasma grafting strategies are developed, namely direct (using core−shell prefunctionalization) and indirect grafting. Noticeably, the latter, using poly(vinylphosphonic acid) as an intermediate layer for self-assembly grafting, potentially opens the way for the functionalization of any polymeric surface by inorganic nanocompounds. This study mainly aims at giving insight into the plasma immobilization process, but also demonstrating the potential it offers in the domain of supported catalysis. The activity of the different hybrid materials has been assessed by monitoring the photodegradation of Rhodamine B dye (ZnO and TiO 2 ) and the removal of Ciprofloxacin antibiotic (Fe-MOF). Also, the reusability of the hybrid photocatalysts has been demonstrated. Independently, it was found that modifying the surface of the metal oxide nanoparticles with organic coupling agentsaiming at their plasma-grafting immobilization on polymer supportsallowed enhancing their photodegradation efficiency up to 20%. Finally, a resin fractal support has been printed by liquid crystal diode-based SLA (stereolithography) and later surface-functionalized by Fe-MOF nanoparticles. This provides evidence to the possibility of using laser-based 3D printing technologies to produce supports with high surface area for the immobilization of catalysts by plasma grafting.
The presence of the antibiotics in the wastewater has posed a huge risk to aquatic life and human health. It is a great significance to develop an effective technology to treat the antibiotics-containing wastewater. In this study, a series of g-C3N4/NH2-MIL-88B(Fe) composite photocatalysts are synthesized through a simple one-step method. The structure and optical properties of prepared photocatalysts are detected by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), UV–Vis absorption spectra (UV–Vis DRS), photoluminescence (PL) spectroscopy and transient photocurrent techniques, respectively. FESEM and TEM show that MOF is uniformly dispersed in petaloid g-C3N4. The uniform dispersion of Fe-MOFs in the heterojunction composites increases the specific surface area ([Formula: see text] of g-C3N4, which results in a great adsorption property for the nanocomposite. The capture experiment shows that [Formula: see text]O[Formula: see text] and h[Formula: see text] are the main active substances in ciprofloxacin (CIP) degradation. These prepared composite photocatalysts exhibit excellent CIP photodegradation activity under visibly light irradiation with an apparent rate constant of 0.0127[Formula: see text]min[Formula: see text] (3.74 times as the rate of single component). The remarkable catalytic performance can be ascribed to the fact that the g-C3N4/NH2-MIL-88B(Fe) heterojunction inhibits the recombination of photoinduced electron–hole pairs and improved the visible light absorption.
Facing the increasingly serious problem of environmental pollution and energy crisis, a novel NH2-MIL-53(Fe)/AgSCN (NMFA) composite photocatalyst was successfully prepared through a one-step chemical precipitation method in the present work....
The novel heterostructure photocatalyst includes photoreduction of Ag0 loaded MIL-53(Fe)/Ag3PO4 (MFAAx) composites were designed and successfully synthesized via hydrothermal with deposition and photoreduction method. Then the physicochemical and optical properties...
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