A green-colored Ni-complexed aminoclay (AC) was synthesized and its size and crystalline nature were confirmed by HRTEM images and XRD, respectively. The AC-Ni system was used as a catalyst towards the reduction of environmental pollutants like Cr(VI), fluorescein (Fluor) and nitrophenol (NiP) individually and also their mixture. The catalytic reduction of Cr(VI) was elaborately studied under different experimental conditions. The thermodynamic parameters were determined. The AC-Ni system exhibited lower energy of activation (E a ) value. The apparent rate constant of individual components and their mixture was determined, analyzed and compared with the literature reports. The pollutants present in the mixture exhibited the lower k app value due to the complex formation.

A novel Ni complexed aminoclay (AC) catalyst was prepared by complexation method followed by reduction reaction. Various analytical techniques such as FTIR spectroscopy, UV-visible spectroscopy, DSC, TGA, SEM, HRTEM, EDX, XPS and WCA measurement are used to characterize the synthesized material. The AC-Ni catalyst system exhibited improved thermal stability and fiber-like morphology. The XPS results declared the formation of Ni nanoparticles. Thus, synthesized catalyst was tested towards the Schiff base formation reaction between various bio-medical polymers and aniline under air atmosphere at 85°C for 24 h. The catalytic activity of the catalyst was studied by varying the % weight loading of the AC-Ni system towards the Schiff base formation. The Schiff base formation was quantitatively calculated by the 1 H-NMR spectroscopy. While increasing the % weight loading of the AC-Ni catalyst, the % yield of Schiff base was also increased. The k app and Ti values were determined for the reduction of indole and a-terpineol in the presence of AC-Ni catalyst system. The experimental results were compared with the literature report.

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A metal and metal oxide quantum dot (QD) was synthesized by a simultaneous oxidative reduction method. Aniline was polymerized both in the presence and absence of o-toluidine (OT) as a co-monomer and in the presence of peroxomonosulfate (PMS) as a free radical initiator in N-methyl pyrrolidone (NMP) medium at 0–5∘C for 3[Formula: see text]h under vigorous stirring condition. The metal or metal oxide bulk powder was used as source material for the generation of QD. At the end of the reaction a dark green colored polymer was formed, filtered and dried at 110∘C for overnight. The dried polymer was subjected to HR-TEM analysis. The size and shape of the crystals formed were noted and compared with the literature reports.