Au/γ-Al_(2)O_(3)催化剂的绿色制备及其催化降解亚甲基蓝性能

Green preparation of Au/γ-Al_2O_(3) catalyst and it's methylene blue catalytic degradation properties

利用侧柏叶提取液为还原剂制备了纳米金负载型Au/γ-Al_(2)O_(3)催化剂,研究了负载条件对金颗粒物理状态及催化剂比表面积的影响。利用XRD、BET、SEM、TEM对催化剂的晶型、孔结构和形貌进行表征,以亚甲基蓝作为目标污染物探究了Au/γ-Al_(2)O_(3)的催化降解能力。结果显示,最佳金负载率为1.00%,最佳煅烧温度为300℃。当Au/γ-Al_(2)O_(3)投加量为0.7 g·L^(-1)时,15 mL 0.5 g·L^(-1) NaBH_(4)能在10 min内降解97.67%的亚甲基蓝,且循环利用5次后单位质量催化剂的亚甲基蓝降解率不下降,说明Au/γ-Al_(2)O_(3)催化剂有良好的催化活性和稳定性。

Cacumen platycladi extracts were used as the reducing agent to prepare Au/γ-Al_(2)O_(3) composites.The effect of Au loading ratio and calcination temperature on catalytic activity were investigated.XRD,BET,SEM,TEM were used to characterize the products.Catalytic activity of Au/γ-Al_(2)O_(3) were studied by utilizing NaBH4 as the reducing agent,methylene blue as the pollutant.The results showed that Au/γ-Al_(2)O_(3) prepared with Au loading ratio of 1.00%,calcination temperature of 300 ℃ had the highest catalytic activity.With a catalyst dosage of 0.7 g·L^(-1),15 mL 0.5 g·L^(-1) NaBH_(4) was able to degrade 97.67%methylene blue within 10minutes.Furthermore,methylene blue degradation ratio per gram of catalyst remained stable after recycling for 5 times,indicating Au/γ-Al_(2)O_(3) has a good catalytic activity and stability.