石墨相氮化碳活化过二硫酸盐降解亚甲基蓝的研究

Graphitic carbon nitride(g-C_3N_4) activated perdisulfate(PDS)for the degradation of methylene blue(MB)

以石墨相氮化碳(g-C_3N_4)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-C_3N_4活化PDS能有效降解MB,且当n(PDS)∶n(MB)=20∶1、g-C_3N_4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-C_3N_4表面。

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-C3N4activated PDS can effectively degrade MB.When n(PDS)∶n(MB)=20∶1,g-C3N4dosage 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.