铈氮改性水热炭活化过硫酸钾降解盐酸四环素

Cerium-nitrogen modified hydrochar for efficient degradation of tetracycline hydrochloride via potassium persulfate activation

以牛粪、双氰胺(C2H4N4)和Ce(NO_(3))_(3)·6H_(2)O为原料,通过微波水热法制备了具有高催化性能的铈氮改性水热炭(Ce-N-HTC),采用XRD、元素分析、SEM、TEM、FTIR和XPS对其进行了表征,并对其活化过硫酸钾降解盐酸四环素(TCH)进行了评价。结果表明,在pH=7.0下,Ce_(0.3)-N-HTC{m[Ce(NO_(3))_(3)·6H_(2)O]/m(双氰胺)=0.3}对TCH 70 min内的降解率可达90.3%,且HCO3–对TCH降解率的影响较大。竞争性自由基猝灭实验和电子顺磁共振测试表明,Ce_(0.3)-N-HTC可通过自由基(·OH)和非自由基(1O_(2))两种途径实现对TCH的降解,循环使用5次对TCH的降解率仍能保持在75%以上。

Cerium-nitrogen modified hydrochar(Ce-N-HTC)with high catalytic performance was prepared by microwave hydrothermal method from cow dung,dicyandiamide(C2H4N4)and cerium nitrate hexahydrate[Ce(NO_(3))_(3)·6H_(2)O],characterized by XRD,elemental analysis,SEM,TEM,FTIR and XPS,and evaluated for its degradation performance of tetracycline hydrochloride(TCH)via potassium persulfate activation.The results showed that at pH=7.0,Ce_(0.3)-N-HTC{m[Ce(NO_(3))_(3)·6H_(2)O]/m(C2H4N4)=0.3}could degrade TCH up to 90.3%in 70 min,of which HCO3–played key role.Competitive radical quenching and electron paramagnetic resonance experiments showed that degradation of TCH by Ce_(0.3)-N-HTC could be realized through both radical(·OH)and non-radical(~1O_(2))pathways.Moreover,the degradation rate of TCH could still maintain above 75%after 5 cycles.