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Open Access Nano Express

Novel Crystalline SiO2 Nanoparticles via Annelids Bioprocessing of Agro-Industrial Wastes

A Espíndola-Gonzalez12, AL Martínez-Hernández3, C Angeles-Chávez4, VM Castaño1* and C Velasco-Santos3*

Author Affiliations

1 Centro de Física Aplicada y Tecnología Avanzada Universidad Nacional Autónoma de México, Campus Juriquilla, Querétaro, México

2 Facultad de Ingeniería, Universidad Nacional Autónoma de México, Edificio Bernardo Quintana. Cd. Universitaria, Querétaro, 04510, México

3 Instituto Tecnológico de Querétaro, Av. Tecnológico S/N Esq. Gral. Mariano Escobedo, Col, Centro Histórico, 76000, México

4 Instituto Mexicano del Petróleo, Eje Central Lázaro Cárdenas Norte 152, San Bartolo Atepehuacan, Gustavo A. Madero, 07730, México

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Nanoscale Research Letters 2010, 5:1408-1417  doi:10.1007/s11671-010-9654-6

Published: 15 June 2010

Abstract

The synthesis of nanoparticles silica oxide from rice husk, sugar cane bagasse and coffee husk, by employing vermicompost with annelids (Eisenia foetida) is reported. The product (humus) is calcinated and extracted to recover the crystalline nanoparticles. X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM) and dynamic light scattering (DLS) show that the biotransformation allows creating specific crystalline phases, since equivalent particles synthesized without biotransformation are bigger and with different crystalline structure.

Keywords:
Silica nanoparticles; Worms; Agricultural waste; Bioprocessing