Fe掺杂A-TiO_2在溴甲酚绿中的可见光催化活性及动力学

Visible light catalytic activity and kinetics of Fe-doped A-TiO_2 in bromocresol green

以FeCl_3·6H_2O为Fe源,采用水热法制备了Fe掺杂锐钛型TiO_2(A-Ti O2)光催化剂。以溴甲酚绿为降解对象,考察溴甲酚绿的初始浓度、催化剂用量、掺Fe量等因素对自制催化剂可见光催化降解反应的动力学方程的影响。结果表明:在40 W白炽灯照射下,当溴甲酚绿初始浓度为10 mg/L(pH=7)、催化剂的用量为0.6 g/L、掺Fe量为4%(摩尔分数)、室温下反应时间为3 h时,溴甲酚绿的降解率最大为76.05%。溴甲酚绿光催化降解曲线符合一级反应动力学方程,于上述最佳条件下其表观反应速率常数k达到最大值,为0.389 7 h-1。

Fe-doped anatase TiO2 （A-Ti02 ） photocatalyst w a s prepared through a hydrothermal proce d u r e b y using FeCl3 · 6H20 as the iron source. With bromocresol green taken as degradation target, the bromocresol green’s initial concentration, Ti02 dosage, amount of iron-doped were investigated for their effects on kinetic equation of catalytic degradation reaction by visible light of self made catalyst. The results showed that the degradation rate 76. 05% of bromocresol green was the maximum figure under the following optimal conditions bromocresol green7s initial concentration po 10 mg/L （pH = 7）, catalyst dosage m 0. 6 g / L , amount of iron-doped 4 % （ m o l a r fraction） , and irradiated by 40 W filament lamp for t = 3 h at room temperature. The photocatalytic degradation curve of bromocresol green conformed to the first-order reaction kinetic equation. Under the above optimum conditions, the observed reaction rate constant K achieved the maximum value of 0. 3 8 9 7 h 1.