Developments of modified magnetic nanoparticle‐supported heteropolyacid photocatalytic performances in methylene blue scavenger

Abstract

In this project, the Keggin‐type polyoxometalate, H5PMoV2O40 (denoted as PMoV), was immobilized on modified NiFe2O4 nanoparticles to produce a magnetically separable catalyst. This catalyst was characterized using X‐ray diffraction (XRD), Fourier‐transform infrared spectroscopy (FT‐IR), field emission scanning electron microscopy (FESEM), cyclic voltammetry (CV), energy‐dispersive X‐ray (EDX), and UV–vis diffuse reflectance spectroscopy (UV‐DRS). The synthesized catalyst demonstrated a high photocatalytic activity in the degradation of methylene blue (denoted as MB) as a pollutant under UV light irradiation. The catalyst could be readily separated from the photocatalytic system using the magnetic field, and the loss of activity was negligible when the catalyst was recovered in five consecutive runs. In addition, optimization was performed using multiresponse optimization and the desirability function approach of the central composite design (CCD). The effects of various factors, such as the catalyst amount, contact time, and pH, on the degradation of MB were investigated. Optimization results for the 20 mg/L MB showed that the maximum degradation efficiency of 95.8% at optimum conditions was: catalyst amount: 22.35 mg, pH = 7.81, and time: 67 min, at ambient pressure and temperature.

Carboxylate Ligand‐supported Agn (n=21 and 24) Alkynyl Clusters Induced by Single/Double Carbonate Ions

“…[89,90] As shown in Figure S12, the FT-IR spectra of compounds 1 and 2 were essentially unchanged before and after the degradation of MB, indicating that compounds 1 and 2 have stability and reusability. [91,92] Therefore, compounds 1 and 2 have potential applications in the field of sewage disposal.…”

Magnetic Nanoparticle Composites: Synergistic Effects and Applications

“…A bond formation between hydroxyl groups on the surface of the magnetic component and metal ions in Keggin-type polyoxometalate took place. [306] Sulfur-doped SnFe 2 O 4 /graphene nanohybrid composites were produced via a facile low temperature solvothermal method by Jia et al Thiourea was used as the S source to prepare S-doped tin ferrite NPs with controlled sulfur concentration through a hydrothermal protocol. These nanocomposites demonstrated a much better activity in the photocatalytic degradation of chlorotetracycline in comparison to their single components.…”

“…A bond formation between hydroxyl groups on the surface of the magnetic component and metal ions in Keggin‐type polyoxometalate took place. [ 306 ]…”