Mild fabrication of silica-silver nanocomposites as active platforms for environmental remediation

Abstract

A new, simple and convenient approach to prepare silver nanoparticles supported on SiO2–PEI composites for the decoloration of organic dyes.

Synthesis of Cu2O@Ag Polyhedral Core–Shell Nanoparticles by a Thermal Decomposition Approach for Catalytic Applications

“…20 min, the physical mixture completed the reduction in 15 min, and PVP‐stabilized silver nanoparticles completed the reduction in 23 min. The observed results are in accordance with previously reported results for the catalytic reduction of methylene blue with Au@polypyrrole/Fe 3 O 4 hollow capsules and silver supported on silica spheres 33,46…”

Versatile hierarchical Cu/Fe3O4 nanocatalysts for efficient degradation of organic dyes prepared by a facile, controllable hydrothermal method

“…[1][2][3] On the one hand, strong colour of dyes and pigments not only results in serious esthetic problems to the contaminated aquatic ecosystem but also leads to ecological problems. [5][6][7][8] More troubling, they can escape from conventional wastewater treatment processes and persist in the environment because of their hydrophilic nature, high stability against light, temperature, water, chemicals and not biodegradable property. [5][6][7][8] More troubling, they can escape from conventional wastewater treatment processes and persist in the environment because of their hydrophilic nature, high stability against light, temperature, water, chemicals and not biodegradable property.…”

“…26,27 In particular, a significant change in reduction potential for metal NPs in comparison to bulk metals, due to the more negative Fermi potential, allows them to act as the ideal catalysts in various electron transfer processes. [29][30][31] For example, Mignani et al 8 supported Ag NPs onto commercial polyethyleneimine-functionalized silica beads as catalyst for the decoloration of MB and other azo dyes in the presence of excess NaBH 4 . [29][30][31] For example, Mignani et al 8 supported Ag NPs onto commercial polyethyleneimine-functionalized silica beads as catalyst for the decoloration of MB and other azo dyes in the presence of excess NaBH 4 .…”

“…4 On the other hand, they are carcinogenic and mutagenic in nature. [5][6][7][8] More troubling, they can escape from conventional wastewater treatment processes and persist in the environment because of their hydrophilic nature, high stability against light, temperature, water, chemicals and not biodegradable property. 9,10 Hence, the effective removal of these type environmental threats is vital of importance.…”

“…28 Taking the practically catalytic application into account, metal NPs are commonly immobilized onto all kinds of supports so as to reduce the higher surface energy as the result of small size and thus avoid the aggregation and decrease of catalytic activity. [29][30][31] For example, Mignani et al 8 supported Ag NPs onto commercial polyethyleneimine-functionalized silica beads as catalyst for the decoloration of MB and other azo dyes in the presence of excess NaBH 4 . Gao et al 32 applying plasma-assisted synthesis method immobilized Ag NPs into 3D mesoporous cellular foams (MCFs) of silica and used for the reduction of 4-NP.…”