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通过水溶液还原法制备纳米铜颗粒,研究了不同反应条件对制备纳米铜的影响。制备纳米铜的最优条件是:当溶液 pH为12、温度为 313K、1%的明胶作为分散剂时,将0.4mol/L NaBH4加入含有 1.2mol/L 氨水的0.2mol/L CuSO4溶液中。此外,进行了一系列实验来模拟反应进程。结果表明,氨水能改变反应进程。当溶液 pH为10时,氨水将Cu2+转化为铜氨络合物,然后被 NaBH4还原为铜颗粒。当溶液pH为12时,氨水将Cu2+转化为氢氧化铜,然后被 NaBH4还原为铜颗粒。
Preparation of nano-copper particles by aqueous solution reduction method, the impact of different reaction conditions on the preparation of nano-copper. The optimum conditions for the preparation of nano-copper are as follows: 0.4mol / L NaBH4 is added into a 0.2mol / L CuSO4 solution containing 1.2mol / L ammonia solution when the solution pH is 12, the temperature is 313K and 1% gelatin is used as the dispersant. In addition, a series of experiments were conducted to simulate the progress of the reaction. The results show that ammonia can change the reaction process. When the pH of the solution is 10, ammonia converts Cu2 + into cuprammonium complex, which is then reduced to copper particles by NaBH4. When the solution pH is 12, ammonia converts Cu2 + to copper hydroxide and then NaBH4 to copper particles.