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Electrochemical quartz crystal microbalance study of perchlorate and perrhenate anion adsorption on polycrystalline gold electrode |
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| Institution: | 1. Research Institute of Petroleum Exploration & Development, PetroChina, Beijing, 100083, China;2. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Fuxue Road No. 18, Changping, Beijing, China;3. Unconventional Gas Research Institute, China University of Petroleum (Beijing), Fuxue Road No. 18, Changping, Beijing, Chinad;1. Dipartimento di Chimica Industriale “Toso Montanari”, Università di Bologna, Viale Risorgimento 4, 40136, Bologna, Italy;2. Dipartimento di Chimica e Chimica Industriale, University of Pisa, Via Moruzzi 13, 56124, Pisa, Italy |
| Abstract: | The electrochemical quartz crystal microbalance (EQCM) was used to study adsorption/desorption of perchlorate and perrhenate ions on a bare polycrystalline gold electrode. An electrode mass change in perrhenate solution was about double that of perchlorate. The equivalent mass of adsorbed anions (about 260 and 120 g F−1 respectively) suggests adsorption of perchlorate and perrhenate anions on a polycrystalline gold electrode in the double-layer region. Water molecules are partially expelled from the gold surface during the initial stages of anion adsorption. The water loss is about three times larger for perrhenate compared to perchlorate due to the bigger ionic radius (volume) of the perrhenate anion. |
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