The behavior of phenol was s tudied and determined using the modified carbon pa s te electrode (MCPE) with nickel oxide nanoparticles doped by nitrogen carbon quantum dots as nanoadsorbent (NiO-NCQD) and cyclic voltammetry (CV). The MCP electrode was manufactured in a laboratory. The modified carbon pa s te consi s ted of 12% (NiONCQD), 44% of graphite powder and 44% of paraffin oil to get a modified carbonate pa s te. Cyclic voltammetry can provide behavior information; as such: diffusion coefficient (D), charge transfer coefficient (α.nα), the mass transport (mtrans) found that diffusion coefficient, the reducing of mass transport (mtrans) by increasing the phenol concentration in the solution, and increasing of con s tant K0 when the concentration of phenol increased in the solution. Also, the highe s t occupied molecular orbital (HOMO), lowe s t unoccupied molecular orbital (LUMO), and Gibbs free energy (ΔG) are s tudied and calculated. In this s tudy, EHOMO=4.92eV, ELUMO=0.32eV, and ΔG=-4.17 were considered. The drinking water samples from Latakia city were analyzed based on NiO-NCQD adsorbent using the MCPE method (NiO-NCQD/MCPE). The phenol concentration in the drinking water sample in Latakia was achieved less than the quantitative detection limit (LOQ), and the proposed procedure was validated by spiking samples.
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