漂浮型光催化劑制備及其除藻性能初探
發(fā)布時間：2019-06-28 15:30
【摘要】：以膨脹石墨為載體,蔗糖為外覆炭層前驅(qū)物,采用溶膠-炭化一步制備膨脹石墨復合炭基氮、磷共摻雜二氧化鈦復合材料(NPT-EGC),通過場發(fā)射掃描電子顯微鏡(FESEM)、氮吸附比表面積及孔容孔徑分析儀(BET)、X射線衍射儀(XRD)、紫外-可見漫反射光譜儀(UV-vis DRS)、X射線光電能譜儀(XPS)和傅里葉變換紅外光譜儀(FT-IR)等分析手段進行材料表征,考察不同煅燒溫度制備的材料的除藻性能.實驗結果表明,NPT-EGC復合材料具有蠕蟲狀的空間結構,表面覆有均勻的二氧化鈦顆粒.氮、磷以摻雜的方式進入二氧化鈦晶格,其中氮主要通過取代氧的方式,而磷主要通過取代鈦的方式.摻雜后復合材料的光能吸收率明顯提高.考察不同煅燒溫度下制備的NPT-EGC材料對銅綠微囊藻的去除性能發(fā)現(xiàn),相對于無催化劑和無光催化負載的情況,復合材料NPT-EGC的除藻性能有明顯提高,其中以450℃下制備的NPT-EGC除藻效果最好,9h的藻細胞去除率在98%以上.另外,漂浮型的材料易被分離回收,更有利于光能轉(zhuǎn)化,在環(huán)境污染治理中應用前景廣闊.
[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，
本文編號：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，
本文編號：2507408
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