Nanoparticles Synthesized from Lichen Extract

(De Gruyter) – Nanoparticles synthesis is carried out with two general approaches; top-down (pyrolysis, lithography, etc.) and bottom-up (chemical vapor deposition, sol-gel technique, electrodeposition, chemical reduction, etc.) methods. The chemical reduction method is widely preferred for synthesis of metal NPs. Chemical reduction of metal salts and stabilization of particles may be realized by chemicals that are harmful to the environment and human health as they contain chemicals such as sodium borohydride (NaBH4), N,N-dimethylformamide and trisodium citrate. Alternative chemicals that are benign for human health and the environment may come from plants.

The authors show a green chemistry approach for the synthesis of Ag, Au and Ag-Au bimetallic nanoparticles using lichen extract from the species Cetraria islandica (L.) Ach. The lichen extract acts both as a reducing and stabilizing agent. Nanoparticles had a small mean diameter and narrow particle size distribution.

The synthesized nanostructures exhibited excellent catalytic activities towards reduction of nitrophenols (4-nitrophenol; 4-NP) to aminophenols (4-aminophenol; 4-AP) with sodium borohydride (NaBH4). It was determined that bimetallic NPs exhibit more effective catalytic activity than monometallic Ag and Au nanostructures.

The authors demonstrate that nanoparticles synthesized by C. islandica (L.) Ach. have great potential for catalytic applications.


Edited for Content and Length by Dr. Matthew A. Hood.

The  full article can be found at De Gruyter in the journal of Green Processing and Synthesis.

2017 IMPACT FACOR 0.736

DOI: 10.1515/gps-2017-0074

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