Fe_(2)O_(3)@Co_(3)O_(4)核壳催化剂活化过一硫酸盐高效降解有机物

Degradation of Organic Pollutants by Peroxymonosulfate Activated with Fe_(2)O_(3)@Co_(3)O_(4) Core-shell Catalyst

以Co(NO_(3))_(2)·6H_(2)O为原料,在碱性环境下生成的Co(OH)2沉淀包覆在普鲁士蓝纳米块上得到催化剂前驱体,将前驱体通过煅烧成功制备了核壳结构的复合型催化剂Fe_(2)O_(3)@Co_(3)O_(4),并通过X-射线衍射、扫描电镜表征手段对催化剂进行表征,利用催化剂活化PMS降解有机污染物。分析可知,在降解双酚A、邻氯苯酚、对氯苯酚、2,4-二氯酚、2,4,6-三氯酚、苯酚等反应中,复合催化剂Fe_(2)O_(3)@Co_(3)O_(4)较Fe_(2)O_(3)、Co_(3)O_(4)有更出色的催化性能,4 min之内即可将双酚A达到100%降解,同时对不同污染物的降解有较好的普遍适用性,通过自由基掩蔽实验可确定硫酸根自由基和羟基自由基是催化体系内的主要活性物种。

The core-shell Fe_(2)O_(3)@Co_(3)O_(4) composite was successfully synthesized by calcining the precursor PB@Co(OH)_(2),which was obtained by the coating of Co(OH)_(2) on Prussian blue(PB)nanoblocks.The Fe_(2)O_(3)@Co_(3)O_(4) composite was characterized by X-ray diffraction(XRD)and scanning electron microscopy(SEM).Thecatalyst Fe_(2)O_(3)@Co_(3)O_(4) exhibited excellent activity on the degradation of organic pollutants by activating PMS.The degradation rate by the composite catalyst Fe_(2)O_(3)@Co_(3)O_(4) was better than Fe_(2)O_(3) or Co_(3)O_(4) in the degradation of BPA which achived 100% degradation within 4 min.The Fe_(2)O_(3)@Co_(3)O_(4) had good universal applicability to the degradation of various pollutants.Through the quenching tests.It was determined that sulfate radical and hydroxyl radical were the main active species in the catalytic system.