Preparation of melamine formaldehyde/nanozeolite Y composite based on nanosilica extracted from rice husks by sol–gel method: adsorption of lead (II) ion

• Published in: Journal of sol-gel science and technology 2020-07, Vol.95 (1), p.211-222
• Main Authors: Hassan, Asaad F., Alafid, Fouzy, Hrdina, Radim
• Format: Article
• Language: English
• Subjects: Adsorbents; Adsorption; Ashes; Ceramics; Chemistry and Materials Science; colloids; Composites; etc.; fibers; Functional groups; Glass; Inorganic Chemistry; Investigations; Materials Science; Melamine; Melamine formaldehyde resins; Nanotechnology; Natural Materials; Optical and Electronic Materials; Original Paper: Nano-structured materials (particles; Sol-gel processes
• ISSN: 0928-0707; 1573-4846
• DOI: 10.1007/s10971-020-05295-y

In the present work nanozeolite Y was prepared from nanosilica powder extracted from rice husks ash by sol–gel method as a green biosource (NZ). Melamine formaldehyde resin (MF) and melamine formaldehyde/nanozeolite Y (MFZ) particles were prepared at pH 9 and 110 °C. NZ, MF, and MFZ were characterized using TGA, SEM, XRD, nitrogen adsorption, pH PZC , and FTIR. Melamine formaldehyde/nanozeolite Y exhibited an advanced textural structure with surface area of 1035.6 m 2 /g and abundance of chemical functional groups. Lead ions adsorption was investigated under different application conditions considering thermodynamic and kinetics studies. The maximum adsorption capacity ( q m , mg/g) was confirmed by MFZ and found to be 180.8 after 60 min of equilibrium time at pH6, 1.0 g/L as adsorbent dosage, and at 40 °C. Lead (II) adsorption onto solid adsorbents fitted with Langmuir adsorption, pseudo-second order, Elovich kinetic, and Vant Hoff’s models. Thermodynamic investigations showed that lead adsorption by all the adsorbents are spontaneous and endothermic. Highlights Nanosilica was synthetized from rice husks ash using sol–gel method. Nanozeolite Y and melamine formaldehyde/nanozeolite Y were prepared by using the synthetized nanosilica. Solid adsorbents were characterized with different physicochemical techniques. Adsorption of Pb +2 ions was investigated under different application conditions. Thermodynamic and kinetic studies for the adsorption process were considered.