以硝酸锌和2-甲基咪唑为原料,采用溶剂法合成了ZIF-8纳米微粒,并以合成的ZIF-8框架作为Au纳米颗粒的载体,研究了Au@ZIF-8对于催化硼氢化钠降解亚甲基蓝的性能。结果表明:25℃下反应24h时,以质子化能力适宜的甲醇作反应溶剂可获得粒径、形貌规则的ZIF-8。Au纳米颗粒很好地负载到金属有机框架(ZIF-8)上,且具有良好的分散性,在紫外光的激发下,降解12min的条件下,Au@ZIF-8对于亚甲基蓝达到了很高的降解率。柠檬酸钠很好地防止了金的团聚,有助于催化的进行,小粒径的Au纳米颗粒可以更快地催化亚甲基蓝的降解。
ZIF-8 nanoparticles were synthesized by solvent method using zinc nitrate and 2-methylimidazolium as raw materials,and the synthesized ZIF-8 frame was used as the carrier of Au nanoparticles.The catalytic performance of Au@ZIF-8 for the degradation of methylene blue by sodium borohydride was studied.The results shown that ZIF-8 with regular particle size and morphology can be obtained by using methanol with suitable protonation ability as reaction solvent at 25℃ for 24h.Au nanoparticles were well loaded on metal-organic framework (ZIF-8) and had good dispersibility.Under the excitation of ultraviolet light,under the condition of degradation of 12min,Au@ZIF-8 had a high degradation rate of methylene blue.Sodium citrate can prevent the agglomeration of gold and facilitated the catalytic process.Au nanoparticles with small particle size can catalyze the degradation of methylene blue more quickly.
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