石墨相g-C_(3)N_(4)活化过硫酸盐降解水中多环芳烃性能研究

Study on the Performance of g-C_(3)N_(4) for Activation of Persulfate for Naphthalene Degradation

采用简单的热解法制备了石墨相g-C_(3)N_(4)非金属材料,探讨了g-C_(3)N_(4)对过硫酸氢钾(PMS)的活化性能并用于降解水体中多环芳烃萘。与此同时,探究p H、活化剂使用量、Ca^(2+)和Mg^(2+)离子质量浓度对萘去除率的影响。结果表明:当g-C_(3)N_(4)使用量为0.05 g、pH=7、PMS与萘的物质的量比为10∶1时,30 min内g-C_(3)N_(4)/PMS体系对萘的去除效率最高,达到91%。当引入阳离子时,高质量浓度Ca^(2+)和Mg^(2+)会显著抑制萘的有效去除。

Graphene-like g-C_(3)N_(4)metal-free nanomaterials was synthesized through a facile pyrolysis method, which was used to activate the potassium monopersulfate for degrading naphthalene in aqueous solution. Meanwhile, effects of catalysis dosage, PMS concentration, pH values and anion concentrations on the degradation efficiency of naphthalene were systematically investigated. The results indicated that when the catalyst dosage, ratio of PMS to naphthalene and pH value were 0.05 g, 10∶1, 7, respectively, the degradation efficiency of naphthalene reached to91% in 30 min. Furthermore, the high mass concentration of Ca^(2+) and Mg^(2+) ions apparently undermined the removal of naphthalene.