Programme

P.72 -- Poster, VCTP-45

Date: Wednesday, 14 October 2020

Time: 08:30 - 10:00

Online presentation

Effects of pH of the precipitation environment on SiO2 synthesis from rice husk ash

Nguyen Thi Huynh Nga

Faculty of Food Technology - Thu Dau Mot University

The situation of SiO2 nanoparticle synthesis research is being concerned with many interesting applications by their adsorption properties. Sources of synthetic SiO2 nanoparticles may come from inorganic or organic matter but recently people often take advantage of agricultural waste such as straw, rice husk, bagasse with high SiO2 content. We synthesized SiO2 from rice husk ash by the method of precipitation in the laboratory to study the effect of pH of the precipitation medium on the structure formation and purity of nano SiO2. The samples S5, S6, S7 are synthesized with the pH respectively pH = 5, pH = 6 and pH = 7. From the analysis methods of UVis, FT IR, XRD, SEM spectroscopy, S5 results showed that SiO2 particles are clustered, amorphous structure, and organic substances have not been expelled from the sample. As the pH increases, the particle size gradually increased, the structure become porous and pure with an average size of about 20.6 nm for the S7 sample. Based on two isothermal adsorption models Langmuir and Freundlich, results show that nano SiO2 gives the adsorbent absorption capacity of MB solution about 81.69% in 90 minutes. From this research, opening the way for the application of SiO2 nanoparticles in wastewater treatment. Key words: nano SiO2, pH effect, methylene blue adsorption

Presenter: Nga Huynh Nguyen Thi

Presentation file: