Rational design of a polypyrrole-based competent bifunctional magnetic nanocatalyst

Abstract

An efficient method to synthesize a magnetic nanocomposite with dual catalytic activities with a synergetic effect between Ag nanoparticles, polypyrrole and TiO2 is described.

Study on catalytic efficiency of platinum and silver nanoparticles confined in nanosized channels of a 3-D mesostructured silica

“…In the absence of the catalysts, the absorbance peak at 400 nm remains unaltered even after long time of reduction reaction [29]. In contrast, the addition of a suitable amount of the catalyst into the solution inductively decline an immediate decolorization of the 4-nitrophenolate solution and the peak intensity located at 400 nm is successively decreased and another new peak of 4-AP is appeared at 300 nm [74]. Figure 5c and d illustrates the plots of absorbance versus reaction time for the reduction of 4-NP by the meso-KIT-6-Pt and meso-KIT-6-Ag catalysts.…”

“…A short induction period may correlate the coordinative unsaturated surface of Pt and Ag atoms, which promote the chemisorption of 4-nitrophenolate ions. Hence, the mechanism of catalytic conversion is presumed to be a chemisorption of 4-NP and BH − 4 on the surface of the catalyst, thereby activates the distant hydrogen at the first stage, as shown in Scheme 2 [29,74,75]. Prior to chemisorption, NaBH 4 reacts with water to provide surface hydrogen for the reduction reaction.…”

Gas Sensors Based on Conducting Polymers

“…Great efforts have been devoted toward the preparation of CP nanomaterials for the fabrication of miniaturized novel flexible sensor platforms that enable portability and high-density arrays because of using small sample amounts, which offer excellent prospects in sensor nanotechnology for advanced detection systems [21]. Recent studies have demonstrated the synthesis of nanostructured CPs with controlled shape and size, which ranged from lithographic techniques to chemical methods [22][23][24][25][26][27][28][29][30][31][32][33]. Stejskal and coworkers demonstrated synthesizing PANI nanostructures and its derivatives by the chemical oxidative polymerization in water [34][35][36].…”

One-Pot Preparation of Conducting Melamine/Polypyrrole/Magnetite Ferrosponge

“…2 Both the adsorptions of anionic [3][4][5][6][7][8] and cationic dyes 7,[9][10][11] have been reported. They have also been tested as photocatalysts for the dye decomposition [12][13][14] or for the separation of heavy-metal ions [15][16][17] or other pollutants. 18 The composite was applied in photothermal therapy because of its absorption of near-infrared radiation, 19 in microwave absorption.…”

“…Both the adsorptions of anionic − and cationic dyes ,− have been reported. They have also been tested as photocatalysts for the dye decomposition − or for the separation of heavy-metal ions − or other pollutants . The composite was applied in photothermal therapy because of its absorption of near-infrared radiation, microwave absorption, , electromagnetic radiation shielding, − magnetorheology, or in the design of new materials for supercapacitor electrodes. − The list demonstrates that other than electrical properties of conducting polymers often come to the forefront…”