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  • One-pot green synthesis of silver/iron oxide composite nanoparticles for 4-nitrophenol reduction.

One-pot green synthesis of silver/iron oxide composite nanoparticles for 4-nitrophenol reduction.

Journal of hazardous materials (2013-02-19)
Jau-Rung Chiou, Bo-Hung Lai, Kai-Chih Hsu, Dong-Hwang Chen
ABSTRACT

Silver/iron oxide composite nanoparticles have been synthesized successfully via a facile one-pot green route by the use of l-arginine, which created an aqueous solution of about pH 10 and acted as a reducing agent for the successive formation of iron oxide and Ag nanoparticles. The product was characterized to be silver-coated iron oxide and iron oxide hydroxide composite nanoparticles with a mean diameter of about 13.8 ± 3.0 nm and 8.53% of Ag in weight. It exhibited good catalytic activity for the reduction of 4-nitrophenol to 4-aminophenol with sodium borohydride. The reduction reaction followed the pseudo-first-order kinetics. The corresponding rate constants increased with the increases of temperature and catalyst amount but decreased with the increase of initial 4-NP concentration, revealing an activation energy of 28.2 kJ/mol and a diffusion controlled mechanism. In addition, this product had quite good stability. No significant activity loss was observed after reuse for 5 cycles.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
4-Nitrophenol, ReagentPlus®, ≥99%
Sigma-Aldrich
4-Nitrophenol solution, 10 mM
Supelco
Acetaminophen Related Compound F, Pharmaceutical Secondary Standard; Certified Reference Material
Supelco
4-Nitrophenol, PESTANAL®, analytical standard
Sigma-Aldrich
4-Nitrophenol, spectrophotometric grade