This study investigates the structure and porosity of carbon nanocomposites synthesised from wheat straw using a two-stage method. Iron (III) chloride and nickel chloride were used as activators. It was found that iron chloride causes a significant increase in the microporosity of the carbon matrix. The magnetic phase in such a nanocomposite is magnetite. Nickel chloride facilitates more effective incorporation of the magnetic phase (nickel) into the nanocomposite structure, as evidenced by an almost tenfold increase in the specific magnetisation compared to the nanocomposite synthesised using iron (III) chloride. It has been shown that nickel nanoparticles have an average size of 100 nm, whilst Fe3O4 magnetite nanoparticles are of the order of 20 nm in size. It has been established that the zero-charge point (рНPZC) for the nanocomposite synthesised using nickel chloride is 9.28, and for the nanocomposite synthesised using iron (III) chloride is 3.44. Due to its high рНPZC value, the nanocomposite synthesised using nickel chloride will be an effective sorbent for PFAS anions in an aqueous medium via electrostatic interaction.
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