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| Impacts of Initial pH and Cl- Concentration on Nantokite Hydrolysis |
Jiale HE, Julin WANG( ) |
| Key Research Base of State Administration of Cultural Heritage for Evaluation of Science and Technology Research in Cultural Relics Protection Field, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China |
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Abstract Nantokite hydrolysis is the key reaction in the progression of bronze disease on cupreous objects. This transformation was researched in solutions of 0.15%~4%NaCl with initial pH value 2~7 (adjusted with 0.5 mol/L H2SO4). The solution color and the pH change were recorded, while the final products of nantokite hydrolysis were characterized by X-ray diffraction analysis. The solution became Cu ion-containing electrolyte after hydrolysis of nantokite in the solution with pH=2.0. The hydrolysis product is Cu4SO4(OH)6·2H2O in solutions with pH=2.4~3.0. However the hydrolysis product is Cu2(OH)3Cl in solutions with pH=3.3~7.0. The procession varies with the concentration of Cl-, namely in solutions with low Cl- cocentration the hydrolysis of nantokite generates cuprite at first and then gradually Cu2(OH)3Cl with the increasing Cl- concentration. In solutions with higher Cl- concentration, the hydrolysis of nantokite generates directly Cu2(OH)3Cl.
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Received: 23 June 2017
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| Fund: Supported by National Natural Science Foundation of China (51471020) |
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