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Electrochemical studies of the nickel catecholate complexes for detection of sulphur dioxide gas |
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| Authors: | Inonge Tembwe Boitumelo Kgarebe Emmanuel Iwuoha |
| Affiliation: | a Department of Chemistry, University of Botswana, Private Bag 00704, Gaborone, Botswana b University of KwaZulu Natal, School of Chemistry, P/Bag x54001, Westville, Durban 4000, South Africa c National Food Technology Research Centre, Private Bag 008, Kanye, Botswana d University of Johannesburg, Auckland Park Kingsway Campus, Johannesburg 2006, South Africa e Department of Chemistry, University of the Western Cape, Private Bag X17, Bellville 7535, South Africa |
| Abstract: | Nickel catecholate complexes, bis(diphenylphosphino)ethanenickelcatecholate (dppe)NiO2C6H34-R1] R1 = CH3 (1), C(CH3)3 (2), H (3) and F (4)] were studied using CV and SWV techniques between −1.5 and +1.5 V at 50 mV s−1 in cathodic and anodic sweeps. Glassy carbon electrode was used with 0.1 M tetrabutylammonium tetrafluroborate (TBATFB) in CH2Cl2. Complexes 1-4 before addition of SO2, showed approximately reversible behaviour (ipa/ipc ≈ 1 and ΔE ≈ 77-88 mV); oxidation peaks observed between +313 and +524 mV, reduction peaks between +225 and +436 mV, depending on the substituent on the ligand. Detection limit 0.01 ppm, linear range 0.01-20 ppm, sensitivity 0.02 ppm/mV (with SWV) were obtained. The complexes 1 and 2 could be used as voltammetric sensors while complexes 3 and 4 would be suitable as amperometric sensors, for monitoring industrial SO2 emissions. |
| Keywords: | Nickel catecholates Sulphur dioxide Square wave voltammetry Gas sensors |
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