Hydroxyapatite nucleated and grown on nano titania particles enhances recruitment of Escherichia coli for subsequent photocatalytic elimination
Hydroxyapatite nucleated and grown on nano titania particles enhances recruitment of Escherichia coli for subsequent photocatalytic elimination
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DOI：
10.1016/j.matchemphys.2014.12.007
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发表时间：
2015-02
影响因子：
4.6
通讯作者：
Jing Huang;Yi Liu;L. Yuxin;Hua Li
中科院分区：
文献类型：
--
作者：
Jing Huang;Yi Liu;L. Yuxin;Hua Li
采用湿化学法制备了二氧化钛-羟基磷灰石（HA）纳米复合材料。HA在纳米TiO 2粒子上表现出结晶取向性成核，形成了HA包覆TiO 2的复合粒子。高分辨透射电子显微镜的微观结构表征表明，HA晶体的（110）和（222）面与HA晶体的（101）面形成共格界面结合。HA层显著促进了大肠杆菌在二氧化钛基颗粒上的募集，用于随后的光催化杀灭。随着老化时间的延长，HA在TiO 2表面的包覆程度越小，其光催化降解亚甲基蓝的能力和杀菌能力越强。新型HA-TiO_2粉体在环境保护领域具有广阔的应用前景。
Titania-hydroxyapatite (HA) nanocomposites were fabricated by wet chemical synthesis approach. HA exhibited crystallographic orientation of nucleation on nano titania particle, forming the composite particles with titania being partially enwrapped with HA. Microstructural characterization by high resolution transmission electron microscopy revealed coherent interfacial bond of (110) and (222) planes of HA crystal with (101) plane of anatase. The HA layer promoted significantly recruitment ofEscherichia colibacteria onto the titania-based particles for subsequent photocatalytic killing. Less extent of enwrapping of HA on titania particle, as accomplished by increasing the aging time of HA suspension, gave rise to better capability of photocatalytic degradation of methylene blue and sterilization of the bacteria. The novel HA-enwrapped titania powder shows great potential for environmental applications.