多核yolk-shell型Co_3O_4@mSiO_2纳米反应器降解双酚A

Mesoporous multi yolk-shell @mSiO_2 nanoreactor for BPA degradation

采用阳离子表面活性剂协助的自模板法合成了中空介孔Si O_2微球(HMSS),然后向含HMSS的悬浮液中加入醋酸钴溶液和氨水,让两种溶液经HMSS表面介孔进入空腔中反应生成Co_3O_4内核,合成了多核yolk-shell型Co_3O_4@m Si O_2(介孔Si O_2)纳米反应器.结合XRD、XPS、SEM、STEM、BET等手段,分析了纳米反应器的形貌、结构、元素形态和比表面积.结果显示纳米反应器均匀分散,粒径约为300nm,表面布满介孔,内部分布大量Co_3O_4纳米粒子,拥有极大的比表面积161m^2/g,远大于Co_3O_4纳米粒子的比表面积35m^2/g,能有效吸附双酚A(BPA),1h吸附容量达12.7mg/g.多核yolk-shell型Co_3O_4@m Si O_2纳米反应器能高效催化过一硫酸氢盐(PMS)降解BPA,2h降解率达81.8%,远高于Co_3O_4纳米粒子的降解率51.3%,同时能节省PMS的投加量,避免水中盐度过高.此外,合成的纳米反应器具有很好的再利用性,在p H值3~9范围内表现出稳定而高效的催化性能.

In this study,a kind of multi yolk-shell Co3O4@m Si O2（mesoporous Si O2）nanoreactor was synthesized.Cationic surfactant assisted self-template method was used to synthesize hollow mesoporous Si O2 microspheres（HMSS）.Then cobalt acetate and ammonia solution were introduced into the cavity through mesoporous to form Co3O4 core.XRD,XPS,SEM,STEM,BET analysis were combined to characterize the structure,element valences,specific surface area and morphology of the synthesized nanoreactor,which showed the nanoreactor was evenly dispersed with about 300nm particle diameter.The surface of the nanoreactor was full of mesoporous,and a large number of Co3O4 particles distributed in its hollow space.Large specific surface area of 161m2/g was demonstrated,which was apparently higher than Co3O4 nanoparticle with 35m2/g specific surface area.The adsorption capacity of BPA by multi yolk-shell Co3O4@m Si O2 nanoreactor was 12.7mg/g within 1h.Peroxymonosulfate（PMS）was catalyzed to degrade 81.8%of BPA within 2h,which was apparently higher than Co3O4 nanoparticle with 51.3%degradation rate.Dosage of PMS was saved by using the nanoreactor,and it could avoid high salinity in water.Furthermore,the nanoreactor was well recyclable,as well as performed to be highly efficient and stable in the p H range of 39.