چكيده به لاتين
Providing new wastewater treatment solutions to remove and reduce hazardous organic pollutants around the world is of particular importance. Therefore, the catalytic reduction of water pollutants such as heavy metals, nitroaromatic compounds, dyes (cationic, anionic and azo) and agricultural poisons used in various industries has attracted the attention of many researchers of different sciences. In this direction and in order to improve the quality of water resources, the biological nanocomposite Cherry Gum/Fe3O4/EDTA/Cu(II) was synthesized by using a simple synthetic approach and towards the goals of green chemistry. In this research, firstly, polymer strands of cherry gum as a natural, non-toxic and environmentally friendly biopolymer were magnetized using a simple method and in situ. Then, it was stabilized using the organic compound of ethylene diamine tetra acetic acid and finally copper (II) ions on the active groups of EDTA and gum. Various characteristics of this biological nanocomposite such as functional groups, elemental composition, surface morphology, magnetic properties and thermal stability were identified using analyzes such as FT-IR, EDS, XRD, FE-SEM, VSM and TGA. Finally, the catalytic property of the prepared biological nanocomposite was studied in the reduction reaction of various derivatives including 4-nitrophenol, methylene blue, rhodamine B and methyl orange in the presence of the green reducing agent NaBH4. Based on the results obtained from UV-Vis spectroscopy, the apparent rate constant and efficiency for the catalytic reduction of 4-nitrophenol, methylene blue, rhodamine B and methyl orange are 0.0258 s-1 and 98%, 0.0205 s-1 respectively. And 96%, s-1 0.0323 and 97%, s-1 0.005 and 96% were obtained. Excellent activity in the catalytic reduction reaction, convenient separation, high thermal stability, easy and low-cost synthesis, short reaction time, excellent structural features such as abundant hydroxyl groups, and reusability up to four times without losing a significant percentage of product efficiency. This has made the nanocomposite an excellent catalyst for the reduction reaction of pollutants in the aqueous environment.
