Magnetically separable, barium hexaferrite (BaFe 12 O 19 ) nanoplatelets were synthesized at various temperatures by cost-effective, molten salt technique and its photocatalytic activity was compared with commercially available TiO 2 . BaFe 12 O 19 nanostructures were characterized by using UV−vis-DRS, FE-SEM, XRD, BET, and Raman and further, subjected to photocatalytic degradation of an organic pollutant, hexahydro-1,3,5trinitro-1,3,5 triazine (RDX) under UV and visible light. The reaction parameters, degradation kinetics, and mechanism were thoroughly studied, and optimum reaction conditions were evaluated. The degradation products were analyzed by HPLC, LCMS, and TOC. The BaFe 12 O 19 -800 °C nanoplatelets (0.6 g•L −1 ) with UV−vis lamp irradiation were efficient and economical to degrade 40 mg•L −1 of RDX below the discharge limits (<0.035 mg• L −1 ) in 300 min whereas TiO 2 showed 4 mg•L −1 of unreacted RDX at similar conditions. Kinetic rate of BaFe 12 O 19 and TiO 2 were observed to be 0.017 and 0.003 min −1 , respectively. Magnetic separation of BaFe 12 O 19 for recovery and recycling is also reported.
The 4-chloro-2-amino phenol (4C2AP) bearing wastewater is produced while manufacturing dyes and pharmaceutical ingredients. Ni-and Cu-based cost-effective catalysts were developed, typically characterized, and subjected to hydrodechlorination (HDC) of 4C2AP. The role of reducing agents, concentration, pH of wastewater, presence of salt, reaction temperature, catalyst reuse, and the kinetics was investigated. A selective makeover of 2-amino phenol (2AP) was analyzed by HPLC, LCMS, and NMR. A complete HDC of 4C2AP with remarkable selectivity (98%) toward 2AP was achieved using a Ni 0 catalyst and NaBH 4 at room temperature. It is observed that the alkaline condition, the presence of salt, and a high reaction temperature favor the HDC process. A maximum of 1 g L −1 of the Ni 0 loading is found to be sufficient to dechlorinate the pollutant. It can be concluded that the catalytic HDC is a technically viable and inexpensive process for the conversion of 4C2AP into a valuable product, 2AP.
Ammonium ionic liquids are being extensively used in several applications and hence, their effluent treatment is a significant cause of concern. Various Ag-doped SnO2 nanoparticles (2, 3 and 5% Ag-SnO2)...
Designing tungsten (W) containing mesoporous photocatalysts has involved excessive usage of rare W salts. The present study depicts the role of ionic mesoporous organosilica (IMOS) constituting polyethylene glycol (PEG)-linked bis-imidazolium...
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