通过水性还原法用NaBH4制备纳米铜颗粒过程中反应参数对制备过程的影响

摘要

The preparation of Cu nanoparticles by the aqueous solution reduction method was investigated.The effects of different reaction parameters on the preparation of Cu nanoparticles were studied.The optimum conditions for preparing well-dispersed nanoparticles were found as follows: 0.4 mol/L NaBH4 was added into solution containing 0.2 mol/L Cu2+,1.0％ gelatin dispersant in mass fraction,and 1.2 mol/L NH3·H2O at pH 12 and 313 K.In addition,a series of experiments were performed to discover the reaction process.NH3·H2O was found to be able to modulate the reaction process.At pH=10,Cu2+ was transformed to Cu(NH3)42+ as precursor after the addition ofNH3·H2O,and then Cu(NH3)42+was reduced by NaBH4 solution.At pH=12,Cu2+was transformed to Cu(OH)2 as precursor after the addition ofNH3·H2O,and Cu(OH)2 was then reduced by NaBH4 solution.%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313 K、1％的明胶作为分散剂时,将0.4 mol/L NaBH4加入含有1.2 mol/L氨水的0.2 mol/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.