Effect of thermochemical activation on thermodynamic adsorption properties of methylene blue and reactive blue 19.

• Grant number: 24/06800-3
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: August 01, 2024
• End date: December 31, 2025
• Field of knowledge: Physical Sciences and Mathematics - Chemistry
• Principal Investigator: Márcia Cristina Bisinoti
• Grantee: Lorena Severino Pereira
• Host Institution: Instituto de Biociências, Letras e Ciências Exatas (IBILCE). Universidade Estadual Paulista (UNESP). Campus de São José do Rio Preto. São José do Rio Preto , SP, Brazil

Abstract

Adsorbent materials are extremely important in various industrial and environmental applications, ranging from catalysis processes to waste treatment. Currently, there is a growing interest in magnetic carbons (CMs), resulting from hydrothermal carbonization (CHT), which combine magnetic nanoparticles with carbon biomasses, offering materials with magnetic properties, chemical stability and high surface reactivity. To improve these properties, thermochemical activation with KOH is commonly used, which provides a significant increase in the specific area and improves the adsorption capabilities of these materials, which in turn can be applied in the adsorption of dyes such as Methylene Blue (AM) and Reactive Blue-19 (R-19) which has harmful effects on human health. In this research, CMs will be produced from sugarcane bagasse with an iron (III) nitrate solution, through the CHT process and will subsequently be subjected to thermochemical activation with KOH varying its proportions by 1: 2 and 1:4 (m:m) with an inert N2 atmosphere at 700 °C. The resulting materials, activated (CMAs) and non-activated, will be decomposed in an acidic medium and quantified for the presence of Fe, K, Ca, Mg and Al, comparing the results with previous analyzes carried out by Energy Dispersive X-ray Spectroscopy ( EDS) and X-ray Diffraction (XRD). Furthermore, CMs and CMAs will be studied as adsorbents for AM and R-19 dyes depending on thermodynamic parameters at temperatures of 20, 40 and 60 °C.