Complexing agent for trivalent rhodium ions in alkaline solution and direct liquid phase preparation method for complex of trivalent rhodium ions
A technology of alkaline solution and complexing agent, applied in rhodium organic compounds, compounds containing elements of group 8/9/10/18 of the periodic table, platinum group organic compounds, etc., can solve the corrosion of underlying materials and limit the application of rhodium range, limited ammonia water complexation ability, etc., to achieve the effect of easy control, simple and easy preparation method, and avoid hydrolysis loss
Inactive Publication Date: 2016-08-31
HARBIN INST OF TECH
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Problems solved by technology
However, trivalent rhodium ions will undergo hydrolysis and precipitation in solutions with a pH greater than 3, so the preparation of most rhodium coatings, coatings and rhodium particles is currently limited to strong acidic media (such as sulfuric acid, hydrochloric acid, phosphoric acid solutions) However, the strong acidic medium will have a strong corrosive effect on the underlying material, thus severely limiting the application range of rhodium
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Effect test
Embodiment 1
[0027] Dissolve rhodium sulfate containing 1 g / L rhodium in water, heat it at 80°C and add KOH to adjust the pH to 5. As a result, rhodium ions are hydrolyzed and precipitated. The precipitation results are shown in figure 1 .
Embodiment 2
[0029] Dissolve rhodium sulfate containing 1 g / L rhodium in water, heat it at 80 °C and add ammonia water to adjust the pH to 8. As a result, rhodium ions are hydrolyzed and precipitated. The precipitation results are shown in figure 2 .
Embodiment 3
[0031] (1) Dissolving rhodium sulfate in sulfuric acid to prepare a rhodium sulfate solution containing 10 g / L of rhodium;
[0032] (2) Dissolve EDTA∙2Na in NaOH solution to make 20 g / L EDTA∙2Na solution;
[0033] (3) Take 900 mL of the solution prepared in step (2), heat it at 80 °C, add 100 mL of the solution prepared in step (1), and control the pH of the mixed solution to 3.4;
[0034] (4) Add NaOH to the solution in step (3) under the conditions of magnetic stirring and heating at 70 °C to adjust the pH to 12. As a result, rhodium ions did not undergo hydrolysis and precipitation, and a clear alkaline complex solution was obtained. See image 3 .
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Abstract
The invention discloses a complexing agent for trivalent rhodium ions in an alkaline solution and a direct liquid phase preparation method for a complex of the trivalent rhodium ions. The complexing agent refers to amino carboxylate and / or hydroxy carboxylate. The method for preparing the corresponding rhodium complex by the complexing agent includes: (1), dissolving rhodium salt in an acid medium, dissolving the complexing agent in an alkaline medium, mixing the two media to obtain a rhodium ion and complexing agent mixed solution, and controlling the molar ratio of the complexing agent and the rhodium ions to 1:1-10:1 to enable the mixed solution to be acid; (2), adjusting the pH value of the mixed solution obtained in the step (1) to 5-14 while stirring and heating, and controlling the heating temperature at 40-90 DEG C. The complexing agent and the direct liquid phase preparation method have the advantages that the rhodium complex stably existing in the alkaline medium can be obtained, and hydrolysis loss of rhodium is avoided; the preparation method is simple and easy to operate and convenient to control, and additional large equipment is not needed.
Description
technical field [0001] The invention relates to a complexing agent for trivalent rhodium ions in an alkaline solution and a method for preparing a corresponding rhodium complex using the complexing agent. Background technique [0002] Metal rhodium has a silver-white metallic luster, high hardness, good wear resistance and corrosion resistance, is stable in the atmosphere and acid and alkali, and does not change color for a long time. It has become the highest-grade decorative coating. In addition, metal rhodium has a wide range of applications in aviation instruments, plug-in parts, reed switches, printed circuit boards (PCBs), organic synthesis catalysts, electrocatalysis, medical implant materials, and advanced mirrors. [0003] At present, the preparation process of rhodium mainly includes four methods: vacuum plating (sputtering), chemical vapor deposition, electroplating and chemical plating. Vacuum plating and chemical vapor deposition equipment are expensive, so the ...
Claims
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IPC IPC(8): C07F15/00
CPCC07F15/008
Inventor 李宁孔德龙黎德育
Owner HARBIN INST OF TECH