Surfactant-assisted morphological tuning of porous metallic silver sponges: facile synthesis, characterization and catalytic performance

Abstract

Nanoporous sponges have many advantages over bulk catalyst structures in terms of providing regular framework of pores and conformational stability. In this paper, precise tuning of porosity and surface morphology in silver sponges for the catalytic reduction of p-nitro phenol to p-amino phenol was explored. The silver spongy catalysts are reusable and stable. The porous catalysts were characterized before calcination by FTIR and TGA and after calcination by XRD, SEM and BET techniques. Catalytic performance of the silver sponges was confirmed by spectrophotometric technique, and it was concluded that the porosity and adsorption capability of silver sponges were responsible for their outstanding catalytic performance. Graphical AbstractThe calcined silver monoliths displayed a potential catalytic activity against the reduction of 4-nitrophenol which is a serious environmental pollutant to 4-aminophenol which is an important intermediate in the synthesis of various analgesic and antipyretic drugs. Fig. (a)-(e) Time-dependent successive UV-vis spectra showing the reduction of 4-nitrophenol catalyzed by 0.06 mg of different silver monolith catalysts (a) Ag/Triton X-100, (b) Ag/Triton X-100/dextran, (c) Ag/Triton X-100/ TMB, (d) Ag/Triton X-100/Ludox (HF treated). (e)

Solar-assisted photocatalytic reduction of methyl orange azo dye over porous TiO2 nanostructures

“…Weight loss due to physically absorbed water up to 3-15% below 150 1C is observed. [40][41][42][43][44] This was followed by a weight drop of almost 50-55% in the temperature range of 180-410 1C which could be attributed to burning and removal of organic templates and additives like Brij-35 and dextran. 45 Above 410 1C another weight drop of 3-4% is due to the combustion of remaining carbon species and other additives.…”

“Design and Synthesis of 3D‐Ordered Mesoporous Co3O4 Nanostructures for Their Improved Supercapacitance and Photocatalytic Activity”

“…Figure e is the thermogram of as‐synthesized samples. The initial weight loss of 25% below 150 °C attributes to physically absorbed water . Further, weight loss of (25‐30%) from 150 to 350 °C may be due to the decomposition of Co(II) nitrate and surfactant to Co 3 O 4 .…”

Electrochemical determination of an anti-hyperlipidimic drug pitavastatin at electrochemical sensor based on electrochemically pre-treated polymer film modified GCE

“…Silver macroporous monolith was synthesized via a reported sol-gel method (Supplementary material) [30] . This synthesized Ag MP material and MWCNTs (5 mg each) of equal weight were dissolved in 10 mL DMF and sonicated for 30 min to get a homogenized suspension.…”