漂浮型光催化剂制备及其除藻性能初探
发布时间：2019-06-28 15:30
【摘要】：以膨胀石墨为载体,蔗糖为外覆炭层前驱物,采用溶胶-炭化一步制备膨胀石墨复合炭基氮、磷共掺杂二氧化钛复合材料(NPT-EGC),通过场发射扫描电子显微镜(FESEM)、氮吸附比表面积及孔容孔径分析仪(BET)、X射线衍射仪(XRD)、紫外-可见漫反射光谱仪(UV-vis DRS)、X射线光电能谱仪(XPS)和傅里叶变换红外光谱仪(FT-IR)等分析手段进行材料表征,考察不同煅烧温度制备的材料的除藻性能.实验结果表明,NPT-EGC复合材料具有蠕虫状的空间结构,表面覆有均匀的二氧化钛颗粒.氮、磷以掺杂的方式进入二氧化钛晶格,其中氮主要通过取代氧的方式,而磷主要通过取代钛的方式.掺杂后复合材料的光能吸收率明显提高.考察不同煅烧温度下制备的NPT-EGC材料对铜绿微囊藻的去除性能发现,相对于无催化剂和无光催化负载的情况,复合材料NPT-EGC的除藻性能有明显提高,其中以450℃下制备的NPT-EGC除藻效果最好,9h的藻细胞去除率在98%以上.另外,漂浮型的材料易被分离回收,更有利于光能转化,在环境污染治理中应用前景广阔.
[Abstract]:Expanded graphite composite carbon based nitrogen and phosphorus co-doped titanium dioxide composites (NPT-EGC) were prepared by sol-carbonation with expanded graphite as carrier and sucrose as precursor. Field emission scanning electron microscope (FESEM), nitrogen adsorption specific surface area and pore volume pore size analyzer (BET), X-ray diffractometer (XRD), UV-vis diffractometer (UV-vis DRS),) were used to prepare expanded graphite composite carbon-based nitrogen and phosphorus co-doping titanium dioxide composites (UV-vis DRS),). The materials were characterized by X-ray photoelectron spectrometer (XPS) and Fourier transform infrared spectroscopy (FT-IR). The algae removal properties of the materials prepared at different calcination temperatures were investigated. The experimental results show that NPT-EGC composites have wormlike spatial structure and uniform titanium dioxide particles on the surface. Nitrogen and phosphorus enter the lattice of titanium dioxide by doping, in which nitrogen is mainly substituted for oxygen, while phosphorus is mainly substituted for titanium. After doping, the photoenergy absorption of the composites is obviously improved. The removal performance of NPT-EGC materials prepared at different calcination temperatures for microcystis aeruginosa was investigated. It was found that the algae removal performance of composite NPT-EGC was obviously improved compared with the absence of catalyst and no photocatalytic load, among which the algae removal effect of NPT-EGC prepared at 450 鈩，
本文编号：2507408
[Abstract]:Expanded graphite composite carbon based nitrogen and phosphorus co-doped titanium dioxide composites (NPT-EGC) were prepared by sol-carbonation with expanded graphite as carrier and sucrose as precursor. Field emission scanning electron microscope (FESEM), nitrogen adsorption specific surface area and pore volume pore size analyzer (BET), X-ray diffractometer (XRD), UV-vis diffractometer (UV-vis DRS),) were used to prepare expanded graphite composite carbon-based nitrogen and phosphorus co-doping titanium dioxide composites (UV-vis DRS),). The materials were characterized by X-ray photoelectron spectrometer (XPS) and Fourier transform infrared spectroscopy (FT-IR). The algae removal properties of the materials prepared at different calcination temperatures were investigated. The experimental results show that NPT-EGC composites have wormlike spatial structure and uniform titanium dioxide particles on the surface. Nitrogen and phosphorus enter the lattice of titanium dioxide by doping, in which nitrogen is mainly substituted for oxygen, while phosphorus is mainly substituted for titanium. After doping, the photoenergy absorption of the composites is obviously improved. The removal performance of NPT-EGC materials prepared at different calcination temperatures for microcystis aeruginosa was investigated. It was found that the algae removal performance of composite NPT-EGC was obviously improved compared with the absence of catalyst and no photocatalytic load, among which the algae removal effect of NPT-EGC prepared at 450 鈩，
本文编号：2507408
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