Abstract: Using graphitic carbon nitride(g-C₃N₄) as catalyst,under simulated sunlight condition,perdisulfate(PDS) has been activated,and cationic methylene blue(MB) degraded. The results show that g-C₃N₄ activated PDS can effectively degrade MB. When n(PDS):n(MB)=20:1,g-C₃N₄ dosage mass concentration 1.0 g/L,and reaction time 120 min, the highest MB degradation rate can reach 93.2%. The influences of pH and temperature on MB degradation are small. Free radical quenching experiments show that sulfate radicals,hydroxyl radicals,superoxygen radicals,and photoelectron holes are all active species of the reaction,and the reaction mainly occurs on the surface of g-C₃N₄.

Key words: graphitic carbon nitride(g-C₃N₄), persulfate(PDS), dyestuffs wastewater

摘要： 以石墨相氮化碳（g-C₃N₄）为催化剂，在模拟日光条件下活化过二硫酸盐（PDS）降解阳离子染料亚甲基蓝（MB）。结果表明：g-C₃N₄活化PDS能有效降解MB，且当n（PDS）：n（MB）=20：1、g-C₃N₄投加质量浓度为1.0 g/L、120 min时，MB降解率最高可达93.2%；初始pH及温度对MB的降解影响不大；自由基猝灭实验表明硫酸根自由基、羟基自由基、超氧自由基和光生电子空穴均为反应的活性物种，且反应主要发生在g-C₃N₄表面。

关键词: 石墨相氮化碳, 过硫酸盐, 染料废水

CLC Number: 

• X703.1