Polyvinyl Chloride-Based Coordination Polymer as Membrane for Phenol Detection

The investigation primarily focuses on synthesizing Polyvinyl Chloride (PVC)-coordination polymer (CP) polymeric membranes that employ L-Cu-NO3 (1∞[Cu3L2(NO3)]NO3·2MeOH·2H2O based on the Schiff base H2L, where H2L stands for N,N’-bis[(2-hydroxybenzilideneamino)-propyl]-piperazine)) as a coordination polymer. The membrane’s capacity to hold moisture is greatly improved by the addition of CPs. The water contact angle dropped from 73.4° for the PVC to about 71° for the composite membrane, indicating that the CP–PVC polymer interactions improved the hydrophilicity. Impedance spectroscopy (EIS) was used to determine the membranes response to the tested concentrations of phenol solution at pH 9.11 in the concentration range of 10−10 to 10−2 mol·L−1. A PVC membrane with a 0.6 wt% L-Cu-NO3 deposit on a Cu electrode yields the best response. Between 10−8 and 10−5 mol·L−1 phenol, a linear dependence was found. The detection limit was 4.64 × 10−8 mol·L−1.