PAPER making! FROM THE PUBLISHERS OF PAPER TECHNOLOGY INTERNATIONAL ® FROM THE PUBLISHERS OF PAPER TE Volume 8, Number 1, 2022
Nano-silica and SiO 2 /CaCO 3 nanocomposite prepared from semi- burned rice straw ash as modified papermaking fillers FATMA A. MORSY 1 , SAID M. EL-SHEIKH 2 , AHMED BARHOUM 3 . Silica (SiO 2 ) nanoparticles and silica/calcium carbonate (SiO 2 /CaCO 3 ) core – shell nanocomposites were prepared by sol – gel technique as fillers for papermaking application. Semi-burned rice straw ash (SBRSA), as waste material, was used to prepare the targeted fillers. Preparation of SiO 2 nanoparticles and SiO 2 /CaCO 3 nanocomposites was carried out using Na 2 SiO 3 solution that was prepared from SBRSA and CaCO 3 nanoparticles of 30 – 70 nm. The targeted SiO 2 /CaCO 3 nanocomposites were prepared with different molar ratio of SiO 2 :CaCO 3 1:15, 1:10 and 1:5. The percentage of silica increased from 62.5% to 82.9% by thermal treatment of SBRSA at 800°C for 2h. The prepared SiO 2 nanoparticles and SiO 2 /CaCO 3 nanocomposites were characterized by using XRD, XRF, TEM, FT-IR and Zeta potential. The results indicate that a pure semi-crystalline SiO 2 nanoparticle and semi-crystalline shell of SiO 2 coated CaCO 3 core particles were produced. The work extended also to investigate the effect of the prepared fillers on physical, mechanical and optical properties of paper. Application of the prepared SiO 2 nanoparticles and SiO 2 /CaCO 3 nanocomposites improved the optical properties of paper (brightness, whiteness and opacity) but it slightly reduced the mechanical properties when compared to commercial precipitated CaCO 3 (PCC) filler. The results showed that the retention of SiO 2 nano-particles was highly increased. The retention of the prepared nanocomposites increased along with increasing of SiO 2 :CaCO 3 molar ratio. Contact information: 1 Paper and Printing Lab., Chemistry Department, Faculty of Science, Helwan University, Cairo, Egypt 2 Nanostructure Materials Division, Advanced Materials Department, Central Metallurgical Research & Development Institute (CMRDI), P.O. Box 87, Helwan 11421, Cairo, Egypt 3 Department of Materials and Chemistry, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium King Saud University, Arabian Journal of Chemistry,
http://dx.doi.org/10.1016/j.arabjc.2014.11.032 Creative Commons Attribution 3.0 International License
The Paper Industry Technical Association (PITA) is an independent organisation which operates for the general benefit of its members – both individual and corporate – dedicated to promoting and improving the technical and scientific knowledge of those working in the UK pulp and paper industry. Formed in 1960, it serves the Industry, both manufacturers and suppliers, by providing a forum for members to meet and network; it organises visits, conferences and training seminars that cover all aspects of papermaking science. It also publishes the prestigious journal Paper Technology International ® and the PITA Annual Review , both sent free to members, and a range of other technical publications which include conference proceedings and the acclaimed Essential Guide to Aqueous Coating .
Article 4 – Nano-fillers from Straw Ash
Page 1 of 12
Made with FlippingBook - Online magazine maker