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Preparation and characterization of nano SiO2 from corn cob ash by precipitation method

K. MOHANRAJ1,* , S. KANNAN1, S. BARATHAN2, G. SIVAKUMAR3

Affiliation

  1. Department of Physics, Manonmaniam Sundaranar University, Tirunelveli- 627 012, India
  2. Department of Physics, Annamalai University, Annamalai Nagar- 608 002, India
  3. Centralised Instrumentation and Service Laboratory, Annamalai University, Annamalai Nagar- 608 002, India

Abstract

In this paper, nano silica was prepared from corn cob ash by precipitation method. Initially, received corn cob ash was calcined at 550 °C, 650 °C, and 750 °C for 2 hr to remove the volatiles in the sample and determine the amorphous structure of SiO2. Next, the thermally treated corn cob ash was mixed with various concentration of NaOH to extract pure SiO2. 1% of polyvinyl alcohol (PVA) also used as the dispersing agent. Finally, nano silica was synthesized from pure silica by precipitation method. The prepared nano silica particles were characterized by XRD, FTIR and SEM with EDS techniques. From the XRD analysis, amorphous characteristic nano silica is observed a broad hump at 2θ=15˚ to 40˚ and average size is found to be 34 nm for normally prepared and 22 nm for 1% PVA addition. It reveals that PVA has reduced the size of the particles. Infrared spectral data confirmed the presence of hydrogen bonded silonal group and siloxane group. SEM images reveal the spherical nature of SiO2 particles and average size of the particles is found to be 25 nm in 1% PVA. A strong signal in the EDS spectrum is confirmed the SiO2..

Keywords

Nano silica, Precipitation method, Calcination, Corn cob ash.

Citation

K. MOHANRAJ, S. KANNAN, S. BARATHAN, G. SIVAKUMAR, Preparation and characterization of nano SiO2 from corn cob ash by precipitation method, Optoelectronics and Advanced Materials - Rapid Communications, 6, 3-4, March-April 2012, pp.394-397 (2012).

Submitted at: Feb. 6, 2012

Accepted at: April 11, 2012