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通过水热法合成KNbO_3粉末,制备上转换发光剂Er~(3+):Y_(2.99)Al_5O_(12),用超声分散和高温焙烧方法合成了复合催化剂Er~(3+):Y_(2.99)Al_5O_(12)/KNbO_3,并用该材料对冰毒水溶液进行超声降解。考察复合催化剂的不同配比、煅烧温度、超声功率、超声温度、催化剂回收次数等因素的影响。以超声波为声源,冰毒为目标降解物,研究了Er~(3+):Y_(2.99)Al_5O_(12)/KNbO_3复合催化剂的声催化降解活性。实验结果表明:400℃高温煅烧1h制备的复合催化剂,在超声功率为700W、频率为45k Hz、体系温度为35℃的条件下,对10mg/L的冰毒超声催化降解2h,降解率可达51.04%。实验中还发现,超声5h后降解能力逐渐减弱,超声8h降解率可达85.35%。该复合催化剂经5次回收,对冰毒水溶液降解能力依然良好。
Synthesis of upconversion luminescent agent Er 3+: Y 2 .99 Al 5 O 12 by hydrothermal synthesis of KNbO 3 powder. The composite catalyst Er 3+ was synthesized by ultrasonic dispersion and calcination at high temperature. ) Al_2O_ (12) / KNbO_3, and using this material for ultrasonic degradation of the aqueous solution of ice. The effects of different ratios of composite catalyst, calcination temperature, ultrasonic power, ultrasonic temperature and the number of catalyst recovery were investigated. Using sonication and ice as the target degradation products, the acatalytic degradation activity of Er ~ (3 +): Y_ (2.99) Al_5O_ (12) / KNbO_3 composite catalyst was studied. The experimental results show that under the conditions of ultrasonic power of 700W, frequency of 45k Hz and temperature of 35 ℃, the composite catalyst prepared by calcination at 400 ℃ for 1 h underwent ultrasonic catalysis degradation of 10 mg / L for 2 h with a degradation rate of 51.04 %. Experiments also found that 5h after ultrasound degradation gradually weakened, ultrasound 8h degradation rate of up to 85.35%. The composite catalyst recovery after 5 times, the degradation capacity of the ice aqueous solution is still good.