Highly efficient degradation of organic dyes by palladium nanoparticles decorated on 2D magnetic reduced graphene oxide nanosheets

Abstract

The application of nanohybrids in water treatment by the catalytic degradation of various pollutants has attracted much attention from researchers. Here, the Pd/Fe3O4-PEI-RGO nanohybrids (1d) with high shape selectivity and high specific surface area have been synthesized by the dispersion of Pd NPs and Fe3O4 NPs on PEI modified graphene oxide sheets. These nanohybrids show superior catalytic activity toward methylene blue with a high degradation efficiency above 99% in the presence of NaBH4 in aqueous solution, which is attributed to the effects of the Pd NPs supported on reduced graphene oxide nanosheets. Meanwhile, the 1d catalyst can be easily separated from the reaction mixture by applying an external magnetic field. The catalyst was recycled nine times without showing any significant loss in its activity. Such features enable this catalyst for promising application in catalysis, environment, and new energy fields.

Green synthesis of Terminalia arjuna-conjugated palladium nanoparticles (TA-PdNPs) and its catalytic applications

“…For these reduction reactions the calculated rate constants were 0.141 min −1 and 0.139 min −1 (Fig. S8c and S8d), respectively, which are consistent with previous reports [50]. The catalytic turn over number (TON) and the turn over frequency (TOF) for the degradation of methylene blue were calculated to be 133 and 14.8 min −1 , respectively.…”

Polyaniline Supported Palladium Catalyzed Reductive Degradation of Dyes Under Mild Condition

“…Simultaneously due to π -π stacking interactions of MB/MO and πconjugation of PANI support, the local concentration of MB/MO near PANI supported Pd (0) nanoparticles as well as the proximity of MB/MO and active catalyst increases. Due to electron relay effect, BH 4 supplies high electron density to polyaniline which in turn increases the electron density around palladium nanoparticles and facilitates the electron transfer to MB/MO and help to degrade the same via reduction [21] (Scheme 3). To establish the exact pathway of hydride or electron transfer, further investigation is required.…”

“…Heterogeneous catalysts are always preferable over homogeneous catalysis for its ease of recovery, recyclability of the precious catalysts, longer service life, and all these attributes leads to a more economical and environmentally friendly process. Intrigue by these facts, recently, considerable efforts are seen in the development of an efficient heterogeneous palladium-based catalyst for degradation of various organic dyes due to the high catalytic activity of palladium [19][20][21][22] as efficient reusability and recyclability of these catalysts can offset the cost of the expensive palladium.…”

Enhancement of azo dyes removal efficiency by using LDH/Tris/Pd catalyst: Kinetic studies

“…Today, various industries including paper, pharmaceuticals, textile, plastic and food industries use azo dyes widely . Through wastewater evacuation, azo dyes could enter surface water which causes environmental pollution and violent health hazards.…”