摘要：

采用高温热解法制备石墨相氮化碳，采用XRD对制备样品进行表征，并将g-C₃N₄催化剂用于超声协同下光催化降解罗丹明B。探究了超声与光催化对降解罗丹明B的协同作用，以及超声功率、溶液初始pH、光催化剂浓度和罗丹明B初始浓度等对罗丹明B降解效果的影响，对催化剂的循环催化性能进行了测试，并对超声协同光催化降解罗丹明B的主要活性物质和机理进行讨论。结果表明：超声功率为300 W，溶液初始pH=4，g-C₃N₄质量浓度为4 g/L，罗丹明B初始质量浓度为15 mg/L时，对罗丹明B的降解效率最佳，100 min去除率能达到近100%，且主要活性物质为·OH和·O^2-。

关键词: 光催化氧化, 超声协同, g-C₃N₄, 罗丹明B

Abstract:

The g-C₃N₄ was prepared by high-temperature pyrolysis method and analyzed by XRD. The degradation of RhB was catalyzed by combining ultrasound and photocatalysis reaction with catalyzer g-C₃N₄. The effects of reaction conditions such as ultrasound coupled with photocatalysis, power of ultrasound, pH of initial concentration, concentration of photocatalyst and initial concentration of RhB on degradation were investigated. The catalyst's cyclic catalytic performance was tested. The main active substances and mechanism of RhB degradation by combining ultrasound and photocatalystis reaction were discussed. The results showed that the optimal condition for nearly 100% degradation within 100 min illuminating were ultrasonic power of 300 W, pH=4, g-C₃N₄ concentration of 4 g/L, and RhB initial concentration of 15 mg/L. And the main active substances were ·OH and ·O^2-.

Key words: photocatalytic oxidation, ultrasonic synergy, g-C₃N₄, RhB

中图分类号: 

• X703.1