Platinum nanoparticle-assembled porous biogenic silica 3D hybrid structures with outstanding 4-nitrophenol degradation performance

Microwave-assisted preparation of a silver nanoparticles/N-doped carbon dots nanocomposite and its application for catalytic reduction of rhodamine B, methyl red and 4-nitrophenol dyes

“…9b), it indicates the reduction of 4-NP was not proceeded without adding catalyst. 16,18,37 When AgNPs/NCDs nanocomposite was added to 4-NP + NaBH 4 solution the absorption peak considerably decreased within 240 s, meanwhile a new peak found around 297 nm, and the peak intensity gradually increased with time, it corresponds to the 4-aminophenol (4-AP) product (Fig. 9c) 13,15,22 and about 99.95% of 4-NP was reduced to 4-AP.…”

“…8,13,14 Noble metal nanoparticles (silver, gold, palladium, and platinum) have attracted signicant attention as a result of their unique optical and physical features as well as their large surface to volume ratio, which makes them applicable in different elds such as biomedical, electronics, photonics, sensing and catalysis. [15][16][17][18][19][20] Among them, mainly silver nanoparticles (AgNPs) have attracted considerable attention because of their high electrical conductivity, cost-effectiveness and antimicrobial activity as well as showing high catalytic efficacy in various chemical reactions such as alkane and alkene oxidation, reduction of dyes, hydrogenation of 4-NP and as intermediates in pharmaceutical reactions. [21][22][23][24][25] A broad series of methods like chemical, physical, laser ablation, hydrothermal, sol-gel, ultrasonication, microwave irradiation and electrochemical have been developed to obtain AgNPs, and additional signicant efforts have been dedicated to controlling their shape as well as size that can signicantly inuence the features of AgNPs.…”

Application of Polypodiopsida Class in Nanotechnology–Potential towards Development of More Effective Bioactive Solutions

“…Dried stems and branches were acid-digested (concentrated HNO 3 /H 2 SO 4 = 4:1, solid:acid ratio = 1:40, 48 h.), washed to a pH of 5, lyophilized and calcinated (air atmosphere, 650 °C, 5 h, heating rate 10 °C/min) by Sola-Rabada et al [ 116 ] to obtain amorphous, 5-nm biogenic silica, used for enzyme immobilization. Following the same recipe, Bogireddy et al [ 117 ] obtained biogenic amorphous silica from the stems of the giant horsetail, functionalized it with APTES and grown PtNPs on the obtained substrate (using a chemical route). The composite was applied for the catalytic reduction of 4-nitrophenol to 4-aminophenol, obtaining a complete reduction in 90 s. at room temperature [ 117 ].…”

“…Following the same recipe, Bogireddy et al [ 117 ] obtained biogenic amorphous silica from the stems of the giant horsetail, functionalized it with APTES and grown PtNPs on the obtained substrate (using a chemical route). The composite was applied for the catalytic reduction of 4-nitrophenol to 4-aminophenol, obtaining a complete reduction in 90 s. at room temperature [ 117 ].…”

Tree‐Inspired Ultralong Hydroxyapatite Nanowires‐Based Multifunctional Aerogel with Vertically Aligned Channels for Continuous Flow Catalysis, Water Disinfection, and Solar Energy‐Driven Water Purification

“…Alternatively, the catalytic degradation of toxic organic pollutants using nanocatalysts has been proved to be highly efficient in a wide range of environmental conditions. [17] Graphene oxide, [18] covalent organic framework, [19] and biogenic silica [20] can not only immobilize and limit the aggregation of nanocatalysts but also relieve the loss of catalytic activity during the recycling process. Nonetheless, the intermittent filtration or centrifugation is a requisite for the regeneration of the nanocatalysts, and the time-consuming operation leads to reduced treatment efficiency and high economic cost, especially for the treatment of massive wastewater.…”