DEVELOPMENT OF ECO-FRIENDLY MAGNETIC NANOBIOCOMPOSITES AND USE FOR STRONTIUM REMOVAL FROM WATER
Project no. 20444 · Status: Kapanmış · 2019
Summary
In this project, effective, safe, environmentally friendly and non-toxic nanobiocomposite materials were synthesized that can be used to remove radiotoxic strontium, which may arise as a result of nuclear contamination, from aquatic environments. Synthesized materials were characterized and their adsorption properties for strontium ions were investigated. Magnetic (Fe3O4) nanobiocomposite was synthesized by co-precipitation method using pectin biopolymer, andthe effects of some experimental parameters (such as pectin concentration and precipitating base type) that play a role in the synthesis were examined, and the differences in the synthesis products were revealed. The physical and chemical properties of the synthesized sorbent materials was examined by various methods (XRD, SEM/EDS, TEM, FTIR, VSM, XPS, BET, TGA/DTA and zeta potential) and the differences between the materials was revealed with their advantages and disadvantages. Considering the parameters affecting the adsorption such as particle size and surface area, the most suitable pectin-based magnetic nanobiocomposite wasselected. In order to remove strontium from aqueous solutions, the effects of basic experimental parameters such as pH, strontium concentration, temperature, contact time and adsorbent dosage on the adsorption behavior of the obtained adsorbents against strontium were modeled with TFDT. The obtained adsorption data were evaluated with high reliability with the artificial neural networks approach, which has become increasingly important in recent years. Langmuir, Freundlich and Dubinin-Radushkevich isotherms were used to determine the adsorption model and related parameters were calculated. In addition, adsorption thermodynamic parameters such as enthalpy, Gibbs free energy change and entropy were calculated. The synthesized magnetic nanobiocomposite was used as an adsorbent for the removal of strontium in the surface waters of the Meriç River and Van Lake, and its suitability for the removal of Sr and other heavy metals was investigated.