TiO2@酵母炭复合光催化剂的静电自组装制备及其光催化性能研究

以酵母炭为载体,通过静电自组装法制备负载型TiO2@酵母炭复合光催化剂,利用FE-SEM、EDS、XRD对TiO2@酵母炭的形貌、组成、尺寸和晶型进行分析和表征,并探讨了TiO2@酵母炭光催化性能的影响因素。FE-SEM分析表明,TiO2@酵母炭呈椭球状,长（3.6±0.3）μm、宽（2.5±0.5）μm,粒径分布均匀。X-射线粉末衍射分析表明,TiO2粒子为锐钛矿和金红石晶型。对于甲酚红的光催化降解研究表明,当甲酚红初始浓度为10mg·L-1、催化剂投加量为5g·L-1、溶液初始pH值为5时光催化效果最好,甲酚红的降解率为89.6%。H2PO-4、NO-3、Cu2＋的存在对甲酚红的降解具有抑制作用,而Mg2＋的存在无明显影响。

Study on Fabrication of TiO_2@Yeast-Carbon Hybrid Photocatalysts via Electrostatic Self-Assembly Method and Their Photocatalytic Performance

TiO2@Yeast-carbon hybrid photocatalysts have been successfully obtained via a facile electrostatic self-assembly method using yeast-carbon as carrier.The products are characterized by field emission scanning electron microscopy（FE-SEM）,energy dispersive spectrometry（EDS）,X-ray diffraction（XRD）,respectively. The FE-SEM analysis results show that the hybrid TiO2@yeast-carbon microspheres have ordered elliptic shape of uniform size with length of（3.6±0.3）μm and width of（2.5±0.5）μm.XRD Patterns indicate that the main crystal structures of TiO2@yeast-carbon microspheres are consisted of TiO2-anatase and TiO2-rutile.The catalytic performance is investigated by analyzing the influence of factors such as the initial pH value,catalyst dosage and co-existing ions.The highest photocatalytic degradation efficiency is achieved and the degradation rate of Cresol Red is 89.6% when the initial concentration of Cresol Red is 10mg·L-1,the catalyst dosage is 5 g·L-1 and the initial pH value of solution is 5.The co-existing ions H2PO-4,NO-3,Cu2＋inhibit the activity of photocatalysis reaction and the co-existing ion Mg2＋has no significant effect.