In Situ Constructed Magnetic Core‐Shell Hydrogen‐Bonded Organic Framework‐on‐Metal–Organic Framework Structure: an Efficient Catalyst for Peroxymonosulfate Activation

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 21, 2024

Abstract Zeolite imidazole‐based framework (ZIF‐67), a notable class of metal–organic frameworks (MOFs), shows promise in activating peroxymonosulfate (PMS) for pollutant degradation due to its uniformly distributed cobalt ions. However, nanoparticle form and the elution ions during use cause challenges recycling risk secondary pollution. In this study, magnetic core‐shell hydrogen‐bonded organic (HOF) on MOF (HOF‐on‐Fe 3 O 4 /ZIF‐67) is successfully prepared. The porous HOF shell not only protects active sites mitigates ion leaching but also reduces mass transfer limitations, ensuring sustained catalytic performance. Fe core enhances electron between ions, boosts efficiency, facilitates easy separation recycling. This structure effectively activates PMS, achieving 100% removal Rhodamine B, model wastewater dye, within 10 min (Rh B = 50 mg L −1 , HFZ 150 PMS 1.5 m pH 7, room temperature). Furthermore, under protection shell, minimized negligible value (0.14 ) after 5 cycles use. research provides fresh perspectives into development composite materials with improved performance recyclability treatment.

Language: Английский

---

MOF‐Derived Ni/ZIF‐8/ZnO Arrays on Carbon Fiber Cloth for Efficient Adsorption‐Catalytic Oxidation

Small, Journal Year: 2023, Volume and Issue: 19(50)

Published: Aug. 25, 2023

Abstract The catalytic oxidation of toxic organic pollutants in water requires enhanced efficiency for commercial applications. A ZnO nanorod array grown on a carbon fiber cloth (CFC) serves as the zinc source to ensure that Ni/ZIF‐8/ZnO nanoreactor is constructed. Ni/ZIF‐8/ZnO/CFC efficiently activates peroxymonosulfate (PMS) bisphenol (BPA) degradation owing its high density active sites, adsorbability, and dispersibility structure, which concentrates adsorptive sites within confined space. Experimental theoretical calculations clearly show introduction Ni beneficial improving adsorption BPA activation PMS. synergistic mechanism adsorption–PMS also investigated, pathway examined. Moreover, filter unit constructed using achieve continuous zero discharge BPA, convenient nanocatalyst recycling. This study aims develop new strategy removal emerging from system with strong capabilities.

Language: Английский

---

Synthesis, Characterization, and Photocatalytic Performance of ZnFe2O4-g-C3N4 Composites for Tetracycline Removal from Contaminated Water

Journal of Nanotechnology, Journal Year: 2024, Volume and Issue: 2024, P. 1 - 15

Published: March 18, 2024

The presence of emerging contaminants in wastewater like tetracycline poses a significant challenge water reuse worldwide. implementation p-n heterojunction and dye-sensitized techniques the enhancement graphite carbon nitride provides promising alternative for visible light-driven degradation present wastewater. study investigated plain composites degrading using natural sunlight parabolic trough reactor. synthesized four ZnFe2O4-g-C3N4 at 5, 15, 25 wt% loading ferrite by direct annealing melamine, followed thermal ultrasonic exfoliation bulk situ precipitation with zinc ferrites to yield composite photocatalyst. photocatalysts were characterized X-ray diffraction (XRD) analyses which confirmed that all spinel phases ZnFe2O4 well bonded g-C3N4 nanosheets form composite. crystallite sizes calculated Debye–Scherrer equation indicating crystal between 4.63 8.61 nm confirming nanostructures. scanning electron microscope-energy dispersive spectroscopy (SEM-EDX) tests verified spherical globules attached mesoporous layers absence contaminant phases. UV-Vis analysis 25% ZF-GCN revealed band gap reduction from 2.67 eV 2.03 eV. PL intensity decreased excitation 266 550 was evidence suppressed charge recombination. A resulted best photocatalytic performance 93.64% total organic (TOC) removal 51.89%. sensitization Eosin Y further improved its 94.62% TOC 68.29%. Therefore, dye is an efficient way improving activity multicomponent photocatalyst pollutants.

Language: Английский

---

Sulfur-doped zinc oxide nanoparticles for enhanced degradation of 2,4-DCP under natural sunlight

Journal of Nanoparticle Research, Journal Year: 2025, Volume and Issue: 27(2)

Published: Feb. 1, 2025

Language: Английский

---

Visible-light-induced self-propelled nanobots against nanoplastics

Water Research, Journal Year: 2023, Volume and Issue: 244, P. 120543 - 120543

Published: Aug. 29, 2023

The accumulation of plastic debris in aquatic organisms has raised serious concerns about the potential health implications their incorporation into food chain. However, conventional water remediation techniques are incapable effectively removing nanoplastics (NPs) smaller than 200 nm, which can have harmful effect on animal and human health. Herein, we demonstrate "on-the-fly" capture NPs through enlargement (approximately 4,100 times) using self-propelled nanobots composed a metal-organic framework. Under visible-light irradiation, iron hexacyanoferrate (FeHCF) nanobot exhibits fuel-free motion by electrostatically adsorbing NPs. This strategy contribute to reducing pollution environment, is significant environmental challenge. Light-induced intervalence charge transfer FeHCF lattice induces bipolarity surface, leading binding negatively charged local electron density then triggers self-propulsion, thereby inducing agglomeration FeHCF@NP complexes stabilize metastable state. maximum removal capacity 3,060 mg∙g-1 rate constant 0.69 min-1, higher those recorded for materials reported literature.

Language: Английский

---