School of Mechanical Engineering, Yeungnam University, Gyeongsan 712-749, South Korea.
Colloids Surf B Biointerfaces. 2013 Jun 1;106:151-7. doi: 10.1016/j.colsurfb.2013.01.012. Epub 2013 Jan 23.
A novel rapid green one-step method is developed for the preparation of bio-silica coated with amorphous MnO2 nanoparticles by treating bio-silica with an acidic permanganate solution. The method developed has the advantage of selectively coating the surface of either one or both sides of the porous silica structure with a thin catalytic active amorphous MnO2 layer in a controlled way. The uncoated and MnO2 coated bio-silica are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The catalytic activity of amorphous MnO2-coated bio-silica is examined by degrading organic dye at ambient condition. The as-synthesized samples show highly efficient and rapid degradation of Rhodamine B. The simplicity and cost-effectiveness of the materials and method can be very useful for highly efficient degradation of organic pollutants for environmental remediation.
一种新颖的快速绿色一步法被开发出来，用于通过用酸性高锰酸盐溶液处理生物硅来制备涂覆有无定形 MnO2 纳米颗粒的生物硅。所开发的方法具有选择性地在多孔硅结构的一个或两个表面上以受控方式涂覆薄的催化活性无定形 MnO2 层的优点。未涂覆和 MnO2 涂覆的生物硅通过 X 射线衍射（XRD）、扫描电子显微镜（SEM）和透射电子显微镜（TEM）进行表征。通过在环境条件下降解有机染料来检查无定形 MnO2 涂覆的生物硅的催化活性。所合成的样品表现出对罗丹明 B 的高效快速降解。该材料和方法的简单性和成本效益对于高效降解环境修复中的有机污染物非常有用。
