Electrochemically Synthesized Molecularly Imprinted Polymers for Potentiometric Sensing of Manganese(II) in Petroleum Wastewater | ||||
| Egyptian Journal of Chemistry | ||||
| Articles in Press, Accepted Manuscript, Available Online from 02 July 2025 | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejchem.2025.379895.11687 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
Hoyeda Elsayaed Ibrahim 1; Ahmed Othman Mahmoud1; Salah Mahmoud Rashwan 1; Tamer Awad Ali  2
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| 1Chemistry Department, Faculty of Science, Suez Canal University,Egypt | ||||
| 2Egyptian Petroleum Research Institute (EPRI), 11727 Cairo, Egypt | ||||
| Abstract | ||||
| The synthesis of a manganese ion-imprinted polymer was carried out using thermal polymerization. This process involved methacrylic acid as the functional monomer, ethylene glycol dimethacrylate (EGDMA) as the cross-linking agent, ammonium persulfate as the polymerization initiator, dithizone as the manganese-binding ligand, and manganese ions as the template ion. Ethanol served as the reaction medium to facilitate the polymerization process. Following the synthesis, an electrochemical sensor was developed, designed specifically for the determination of manganese (II) ions with high selectivity. This sensor utilized a modified carbon paste electrode (MCPE), which was further enhanced by the incorporation of multi-walled carbon nanotubes (MWCNTs). The inclusion of MWCNTs significantly improved the performance characteristics of the electrode by increasing its conductivity and surface area. They found linear concentration ranges of 1.0 × 10-7 to 1.0 × 10-1 mol L-1, with Nernstian slopes of 29.74 ± 0.18 mV decade-1. The detection limit for the carbon paste electrode (Electrode III) was 1.0 × 10-7 mol L-1, and the electrode (III) response time was 8 s. Without a divergence, the paste may be used for more than 125 days, and the electrode (III) can detect pH levels ranging from 3.5 to 8.5. Electrode (III) has an isotherm coefficient of 0.00016 V/ºC. The interference effects of other ionic species were thoroughly studied to assure selectivity, with findings validating the suggested electrode’s capacity to discriminate manganese (II) ions from competing ions successfully. This underscores its applicability for practical applications requiring precision ion detection. The electrode architecture provides various benefits, including excellent sensitivity, selectivity, operating simplicity, and a very low detection limit. Furthermore, comparison studies were done to establish the performance of the electrochemical sensor versus atomic absorption spectrometry (AAS). These comparisons confirmed that the potentiometric sensor produces reliable and consistent results, establishing it as a competitive and efficient alternative for manganese (II) ion determination. | ||||
| Keywords | ||||
| Modified carbon paste electrode; Electrochemical sensor; Molecular imprinted polymer; Manganese (II) ion determination | ||||
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