羟基石榴石 Ba3In2(OH)12的水热合成与光催化性能

Hydrothermal Synthesis and Photocatalytic Property of Hydrogarnet Ba_3In_2(OH)_(12)

以Ba(NO3)2和In(OH)3为起始物,采用水热法成功制备了羟基石榴石Ba3In2(OH)12。探讨了钡铟摩尔比(Ba/In)、氢氧化钠浓度cNaOH、水热反应温度(T)和时间(t)对Ba3In2(OH)12形成的影响,确定了适宜合成条件:n(Ba)/n(In)=2:1、cNaOH=7.0mol/L、T=200℃和t=14 h。以罗丹明B(Rh B)为降解模型,考察了Ba3In2(OH)12的光催化性能。结果表明:对于50 m L浓度为5.0 mg/L的Rh B溶液,当催化剂加入量为0.1 g时,在高压汞灯下照射180 min,Rh B的降解率可达95.6%;而在氙灯辐照同样时间,其降解率只有18.3%,说明Ba3In2(OH)12具有优异的紫外光催化活性。

The hydrogarnet Ba3In2（OH）12 was synthesized with Ba（NO3）2 and In（OH）3 as raw materials by a hydrothermal method. The effects of Ba to In molar ratio [n（Ba）/n（In）], concentration of NaOH, hydrothermal reaction temperature （T） and time （t） on the formation of Ba3In2（OH）12 were investigated. The optimum synthesis conditions are n（Ba）/n（In） of 2：1, the concentration of NaOH of 7.0 mol/L, 200 ℃ and 14 h. The photocatalytic activity of Ba3In2（OH）12 was also investigated with rhodamine B （RhB） as a simulated degradation compound. The results show that the degradation rate of RhB at 5.0 mg/L RhB solution （50 mL） and 0.1 g of photocatalyst amount is 95.6% under high pressure mercury lamp irradiating for 180 min, while the degradation rate of RhB is 18.3%under xenon lamp irradiating for 180 min. This reveals that the Ba3In2（OH）12 has a superior UV-photocatalytic activity.