Catalytic reduction of 4‐nitrophenol using synthesized and characterized CoS@MorphcdtH/CoS@4‐MPipzcdtH nanoparticles

Abstract

CoS@MorphcdtH NPs and CoS@4-MPipzcdtH NPs were synthesized by precipitation method involving three mechanisms: inclusion, occlusion, and adsorption. The synthesized NPs were characterized with the help of UV-Vis spectroscopy, FESEM-EDAX, powder x-ray diffraction, TEM, ESIMS, TG/DSC analysis. The morphology of the CoS@MorphcdtH NPs and CoS@4-MPipzcdtH NPs were hexagonal and rectangular, and the particles were in the range 7-12 nm. UV-visible spectral measurements showed surface plasmon resonance at 320 nm-340 nm with band gap of 3.65 eV-3.86 eV. The catalytically active CoSNPs called were investigated for the reduction of 4-nitrophenol (4-NP) via hydrogenation using sodium borohydride (NaBH 4 ) as a reducing agent. Both the CoS NPs successfully reduced 4-NP to 4-aminophenol (4-AP) in a short time, catalytic performances are almost unchanged for the first five cycles. Herein, we report the preparation and characterizations of efficient active CoS NPs consisting carbodithioic acid framework as a support/capping material, along with catalytic property.

Recyclable Ag-Au bimetallic nanoparticles supported on acid functionalized multi walled carbon nanotubes for effective catalytic applications

“…The UV-vis absorption spectra were recorded for the aqueous reaction mixture at a fixed time interval and the reduction of 4-NP was monitored. The catalytic reaction kinetics was studied using the time-dependent adsorption spectra [28,29].…”