Dead biomass of Amazon yeast: A new insight into bioremediation and recovery of silver by intracellular synthesis of nanoparticles

Author(s)

Salvadori, Marcia R. ^[1] ; Ando, Romulo A. ^[2] ; Oller Nascimento, Claudio A. ^[3] ; Correa, Benedito ^[1]

Affiliation

^[1] Univ Sao Paulo, Biomed Inst 2, Dept Microbiol, BR-05508000 Sao Paulo - Brazil

^[2] Univ Sao Paulo, Inst Chem, Dept Fundamental Chem, Sao Paulo - Brazil

^[3] Univ Sao Paulo, Dept Chem Engn, Sao Paulo - Brazil

• Document type: Journal article
• Source: JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING; v. 52, n. 11, p. 1112-1120, 2017.
• Web of Science Citations: 1

Abstract

This investigation was undertaken to describe a natural process for the removal of silver and the simultaneous recovery of Ag/Ag2O nanoparticles by dead biomass of the yeast Rhodotorula mucilaginosa. The removal of silver ions from aqueous solution and the synthesis of Ag/Ag2O nanoparticles were analyzed based on physicochemical factors and equilibrium concentration, combined with transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), and infrared spectroscopy (FTIR). A successful process for the synthesis of Ag/Ag2O nanoparticles was obtained, following the Langmuir isotherm model, showing a high biosorption capacity of silver (49.0mgg(-1)). The nanoparticles were spherical, had an average size of 11.0nm, were synthesized intracellularly and capped by yeast proteins. This sustainable protocol is an attractive platform for the industrial-scale production of silver nanoparticles and of a silver nanobiosorbent. (AU)

• FAPESP's process: 16/04364-5 - Diversity of Fusarium graminearum Species Complex isolated from wheat and native grasses of Brazil.
• Grantee: Benedito Corrêa
• Support Opportunities: Regular Research Grants