Document Details
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Document Type |
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Thesis |
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Document Title |
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DEVELOPMENT OF EFFICIENT ELECTROCHEMICAL SENSORS BASED ON CHELATING AGENTS AND NANOMATERIALS FOR THE DETECTION OF HEAVY METAL IONS AND CHEMICALS تطوير مجسات كهروكيميائية فعاله من المواد المخلبية والمواد المتناهية الصغر للكشف عن ايونات المعادن الثقيلة والكيماويات |
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Subject |
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Faculty of Sciences |
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Document Language |
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Arabic |
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Abstract |
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Industrialization, urbanization, intensive agriculture, and many other anthropogenic activities for domestic purposes make our environment very polluted by releasing ubiquitous contaminants in our ecosystem. No doubts, various techniques have been developed for their detection and removal but some are not viable quantitatively. Even if some are viable, then, they are very expensive and multifaceted. So it has become our need to design cheap, reliable, selective, and interference-free determination of ubiquitous contaminants from our eco-environment, qualitatively and quantitatively. In this study, electrochemical sensors based on chelating agents and Er-doped semiconductor nanomaterials, were developed and an electrochemical approach (I-V techniques) was applied for the detection of heavy metal ions and toxic chemicals in aqueous systems, quantitatively and qualitatively. Chelating agents such as [EBDMBS], [EDBDMBS], [CDBDMBS], & [MPEBSH] were synthesized by simple condensation reaction. Single crystal XRD, 1H-NMR, 13C-NMR, UV-Vis, and FT-IR were used for their structural and optical characterization. Similarly, Er-doped semiconductor nanostructure materials such as Co3O4@Er2O3 nanorods, doped Er2O3/CuO nanoblocks, and Zn-doped Er2O3 nanocomposites were synthesized by the wet chemical method. They were well characterized by using UV-Vis, FT-IR, powder XRD, FESEM, and EDS. After characterization, they were fabricated onto the flat surface of GCE with 5 % ethanolic nafion as a conducting binder for the development of electrochemical sensors. Electrochemical sensor probes, based on chelating agents such as EBDMBS/Nafion/GCE, EDBDMBS/Nafion/GCE, CDBDMBS/Nafion/GCE, and MPEBSH/Nafion/GCE, were found to be very sensitive and selective against Co2+, Ni2+, Ga3+, and Cd2+in the presence of other interfering heavy metal ions, respectively. The detection limits of Co2+, Ni2+, Ga3+, and Cd2+ were found as 0.17, 0.78, 0.024, and 0.14 nM, respectively. So, electrochemical sensors, based on Er-doped semiconductor nanomaterials such as Co3O4@Er2O3 NRs/Nafion/GCE, doped Er2O3/CuO NBs/Nafion/GCE, and Zn-doped Er2O3 nano-composites/Nafion/GCE, were found to be very sensitive and selective against the 4-HR, 3-CP, and para-NP, in the presence of other interfering toxic chemicals, respectively. The detection limit of 4-HR, 3-CP, and para-NP were found as 64.29 pM, 0.09 nM, and 0.033 pM, respectively. These newly designed electrochemical sensors, based on the above stipulated synthesized materials were found to be very sensitive and selective against specific heavy metal ions and toxic chemicals, even at very low concentration in short response time with good reproducibility as well as stability using the I-V technique as qualitatively and quantitatively. Therefore, this novel approach introduces a new and well organized system for the development of efficient, reliable, cheap, sensitive, and selective electrochemical sensors for the detection of heavy metal ions and toxic chemicals in the environmental and health-care fields on large scales. |
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Supervisor |
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Prof. Dr. Abdullah M. Asiri |
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Thesis Type |
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Doctorate Thesis |
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Publishing Year |
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1439 AH
2018 AD |
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Co-Supervisor |
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Prof. Dr. Hadi M. Marwani |
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Added Date |
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Thursday, May 31, 2018 |
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Researchers
| طاهر علي شيخ | Sheikh, Tahir Ali | Researcher | Doctorate | |
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