活性炭负载钴铁氧化物活化PMS去除水中有机物

Removing Organic Matter from Water with PMS Activated by Activated Carbon-supported Co-Fe Oxide

文章以颗粒活性炭(GAC)作为载体,通过浸渍-煅烧的方法将钴铁氧化物负载到GAC上,优化制备得到Co-Fe@GAC催化剂。使用扫描电子显微镜及X射线衍射对Co-Fe@GAC进行微观形貌及结构分析,探究了不同条件下催化剂活化过一硫酸盐(PMS)降解以罗丹明B(RhB)为代表的有机污染物的效果,并考察了共存离子及腐殖酸对其降解效果的影响。实验结果表明,增加Co-Fe@GAC和PMS投加量可以明显提升RhB的去除效率,且该体系在较宽的p H范围内表现出良好的降解效果及抗干扰能力。自由基捕获实验表明,在Co-Fe@GAC/PMS体系中同时存在羟基自由基和硫酸根自由基(SO_(4)^(·-)),且SO_(4)^(·-)发挥主导作用。此外,Co-Fe@GAC的催化性能较为稳定,能够多次重复使用。

A kind of novel catalyst Co-Fe@GAC was prepared by the method of impregnation-calcination with cobalt and iron oxides attached onto granular activated carbon(GAC),and microscopic morphology and structure of the catalyst were analyzed by scanning electron microscopy and X-ray diffraction.Then the laboratory experiment was conducted focusing on examining the effects of degrading Rhodamine B(RhB),a representative organic pollutant,by peroxymonosulfate(PMS)that was activated by Co-Fe@GAC in different circumstances including co-existing ions and humic acids contained in the system.The experiment revealed that by increasing the dosage of Co-Fe@GAC catalysts and PMS concentration it could significantly improve the removal efficiency of RhB,and the system also showed a good degradation performance in a wide-range of pH,in addition,with interference resistance;and the oxidative species quenching test indicated that both hydroxyl radicals and sulphate radicals(SO_(4)^(·-))existed in the Co-Fe@GAC/PMS system,and SO_(4)^(·-) was the dominant radical in RhB degradation.Besides,Co-Fe@GAC,being re-usable,was considerable stable in terms of catalytic performance.