Cu2S纳米片的溶剂热合成及其光催化性能研究

以CuCl.22H2O、（NH2）2CS为原料,以乙二胺为螯合剂,在160℃溶剂热条件下反应12小时一步合成Cu2S晶体。采用X射线衍射,扫描电子显微镜,光电子能谱等方法对样品的结构进行表征,结果表明,合成物为三叉状Cu2S纳米片。同时,以高压汞灯为辐照源对亚甲基蓝溶液进行光催化活性实验表明,所制备的样品具有很高的光催化活性。     

Cu2S纳米片的溶剂热合成及其光催化性能研究

以CuCl2·2H2O、(NH2)2CS为原料,以乙二胺为螯合剂,在160℃溶剂热条件下反应12小时一步合成Cu2S晶体。采用X射线衍射,扫描电子显微镜,光电子能谱等方法对样品的结构进行表征,结果表明合成物为三叉状Cu2S纳米片。同时,以高压汞灯为辐照源对亚甲基蓝溶液进行光催化活性实验表明所制备的样品具有很高的光催化活性。     

BiOCl纳米片的制备及光催化性能研究

以一步合成法合成了Bi OCl纳米片,并考察了制备溶液的p H对Bi OCl晶形、形貌、光学性质及光催化效果的影响。采用X射线衍射谱(XRD)、扫描电子显微镜(SEM)、光致荧光光谱(PL)和紫外-可见漫反射光谱(UV-Vis)对所制的Bi OCl样品进行表征,并以罗丹明B为目标降解物,研究不同制备溶液p H制得的Bi OCl样品的光催化性能。表征结果表明,制备溶液的p H对Bi OCl的形貌、晶粒均匀性、晶面生长性能、光生电子-空穴复合能力、禁带宽度都有很大的影响。罗丹明B降解实验结果表明,制备溶液p H=6的Bi OCl纳米片具有最佳光催化活性,经可见光照射30 min后对罗丹明B的降解率达100%。此外,还对制备溶液p H对Bi OCl光催化效果的影响机理进行推测。     

BiOCl纳米片的制备及光催化性能研究

以一步合成法合成了Bi OCl纳米片,并考察了制备溶液的p H对Bi OCl晶形、形貌、光学性质及光催化效果的影响。采用X射线衍射谱(XRD)、扫描电子显微镜(SEM)、光致荧光光谱(PL)和紫外-可见漫反射光谱(UV-Vis)对所制的Bi OCl样品进行表征,并以罗丹明B为目标降解物,研究不同制备溶液p H制得的Bi OCl样品的光催化性能。表征结果表明,制备溶液的p H对Bi OCl的形貌、晶粒均匀性、晶面生长性能、光生电子-空穴复合能力、禁带宽度都有很大的影响。罗丹明B降解实验结果表明,制备溶液p H=6的Bi OCl纳米片具有最佳光催化活性,经可见光照射30 min后对罗丹明B的降解率达100%。此外,还对制备溶液p H对Bi OCl光催化效果的影响机理进行推测。     

BiOCl制备方法对其光催化降解卡马西平性能的影响

采用3种不同制备方法制备了BiOCl光催化剂,X射线衍射仪、扫描电子显微镜和紫外可见漫反射光谱表征说明不同制备方法,显著影响了BiOCl的结晶性能、形貌和光吸收性质,进而影响了其对卡马西平的光催化降解能力。其中采用BiCl_3和尿素并通过超声辅助水热法制得的BiOCl-1对卡马西平的光催化降解效率最高,这主要是与其较高的结晶性、较大的微球状形貌和较强的光吸收性能有关。结果表明,基于BiOCl的光催化技术可有效用于降解药物废水。     

BiOCl制备方法对其光催化降解卡马西平性能的影响

采用3种不同制备方法制备了BiOCl光催化剂,X射线衍射仪、扫描电子显微镜和紫外可见漫反射光谱表征说明不同制备方法,显著影响了BiOCl的结晶性能、形貌和光吸收性质,进而影响了其对卡马西平的光催化降解能力。其中采用BiCl_3和尿素并通过超声辅助水热法制得的BiOCl-1对卡马西平的光催化降解效率最高,这主要是与其较高的结晶性、较大的微球状形貌和较强的光吸收性能有关。结果表明,基于BiOCl的光催化技术可有效用于降解药物废水。     

微波辅助合成BiOCl及其光催化性能

采用微波辅助合成法,得到了不同溶剂,不同微波时间下的BiOCl,对有机染料罗丹明B(RhB)的降解实验表明,以甘露醇为溶剂,微波反应10 min,所得到的BiOCl具有最好的光催化降解性能。     

Ti掺杂BiOCl纳米片的制备及其压电光催化性能研究

采用一步水热法制备了Ti掺杂的BiOCl纳米片，并利用XRD、SEM和PFM以及其他分析测试技术对所制备催化剂的晶体结构和形貌进行测试。以四环素（TC）为目标污染物，在模拟太阳光和超声作用下，研究了Ti-BiOCl的压电光催化性能。结果表明，Ti-BiOCl材料由厚度为25～250 nm的纳米片组成，具有良好的晶体结构和较高的压电响应能力。在光（300 W）和超声（45 kHz,100 W）协同作用下，Ti-BiOCl在20 min内可以去除94.79%的TC。室温下一级反应速率常数达0.168 min-1，显著优于单独光催化或单独压电催化过程。     

溶剂热法合成氧化锌纳米棒

采用PEG辅助溶剂热合成了ZnO纳米棒,通过SEM、EDS和XRD等手段对产物进行了表征。结果显示,合成的ZnO纳米棒直径在20 nm左右,长大约150,且长度和直径分布均匀。研究了PEG的添加量对形成ZnO纳米棒的影响,并且探讨了PEG促进纳米棒生长的机理。     

纳米二氧化钛光催化降解染料废水动力学研究

以纳米二氧化钛为光催化剂,研究了光催化降解染料废水溶液的动力学规律及溶液的pH值、TiO2投加量和染料起始浓度对光催化降解活染料废水动力学的影响。结果表明,该反应符合Langmuir-Hinshelwood(L-H)动力学模型,且光催化过程符合一级反应动力学方程,一级反应动力学常数(K')随溶液pH值及染料起始浓度的降低而增大;TiO2的最佳投加量为2.0 g/L,低于或超过该值都会导致降解速率的下降。     

石墨烯稀土复合物的制备及其光催化降解水中染料的性能研究

文章采用石墨烯与稀土氧化物结合,通过水热合成法制备合成石墨烯氧化钇复合物(GO-Y2O3)。通过对比石墨烯、氧化钇、GO-Y2O3同时在不同的实验对比如:样品光催化降解甲基橙的比较、研究时间对光催化降解甲基橙的影响、研究溶液p H对光催化降解甲基橙的影响最终证明GO-Y2O3对甲基橙光催化效果最好。     

可见光响应型BiOCl/AgCl光催化剂的合成及其光催化活性

以氯化铋和硝酸银为主要原料,采用水解法制备了可见光响应型的高效复合催化剂BiOCl/AgCl.利用X射线仪、扫描电镜等手段对样品进行表征,并以罗丹明B(RhB)为目标污染物,250 W卤素灯为可见光光源测试其光催化性能,研究了初始Bi3+/Ag+物质的量比、溶液pH值等对BiOCl/AgCl光催化活性的影响,并以EDTA,NBT andTBA作为抑制剂对光催化过程中产生的活性物种进行了检测.结果表明,以Bi3+/Ag+初始物质的量比为100:1合成的样品具有最佳的光催化活性,在RhB的浓度为20 mg/L、pH =4.6、光照30 min条件下,RhB的脱色率、COD和TOC去除率分别为98％、73％和48％.活性物种的检测表明光催化过程产生的主要活性物种为超氧阴离子,而非空穴和·OH自由基.     

Microwave-Assisted Synthesis of Titania Nanocubes, Nanospheres and Nanorods for Photocatalytic Dye Degradation

TiO₂ nanostructures with fascinating morphologies like cubes, spheres, and rods were synthesized by a simple microwave irradiation technique. Tuning of different morphologies was achieved by changing the pH and the nature of the medium or the precipitating agent. As-synthesized titania nanostructures were characterized by X-ray diffraction (XRD), UV–visible spectroscopy, infrared spectroscopy (IR), BET surface area, photoluminescence (PL), scanning electron microscopy (SEM) and transmission electron microscopy (TEM), and atomic force microscopy (AFM) techniques. Photocatalytic dye degradation studies were conducted using methylene blue under ultraviolet light irradiation. Dye degradation ability for nanocubes was found to be superior to the spheres and the rods and can be attributed to the observed high surface area of nanocubes. As-synthesized titania nanostructures have shown higher photocatalytic activity than the commercial photocatalyst Degussa P25 TiO₂.     

Solvothermal Synthesis of Mesoporous TiO2 Using Sodium Dodecyl Sulfate for Photocatalytic Degradation of Methylene Blue

Mesoporous titanium dioxide (TiO₂) photocatalysts were synthesized via a solvothermal method using sodium dodecyl sulfate (SDS) as templates. The effect of the SDS concentration and solution pH value on the resulting TiO₂ catalyst and its photocatalytic activity were studied. The photocatalytic activity was assessed by degradation methylene blue under low-power (8W?×?4) UV light irradiation. The best performance showed that over 95% of methylene blue was degraded in 120 min and in the presence of S20 (20 mmol SDS addition, pH?=?4). With the optimal addition of SDS, the crystal size was reduced, and the surface area was increased. In addition, some bidentate-sulfates (–SO₄^2?) residues were observed within the prepared mesoporous TiO₂. The Detail characterization of of the as-prepared TiO₂ samples were conducted by X-ray diffraction, Ultraviolet–Visible Spectroscopy, Scanning electron microscope, Brunauer-Emmett-Teller analysis, and Fourier-transform infrared spectroscopy, respectively.

     

光降解偶氮染料的研究进展

本文对偶氮染料废水的处理方法,TiO2光催化氧化法降解染料废水的机理,以及提高偶氮染料废水光催化氧化效率的途径进行了综述,重点对国内外偶氮染料废水光催化氧化技术的最新研究进展进行了分析,并展望了TiO2光催化氧化降解偶氮染料废水今后发展的方向和趋势。     

Facile Hydrothermal Synthesis of Copper Chromite Nanoparticles for Efficient Photocatalytic Degradation of Acid Orange 7 Dye

In this paper, the hydrothermal method was utilized for the facile synthesis of copper chromite nanoparticles in the absence (abbreviated as CC1) and presence of citric acid (abbreviated as CC2) and tartaric acid (abbreviated as CC3) as templates. The synthesized nanoparticles were characterized using different tools such as XRD, FT-IR, UV–Vis, FE-SEM, HR-TEM, and BET. The average crystallite size of the CC1, CC2, and CC3 samples is 25.45, 20.26, and 12.75 nm, respectively. The FT-IR spectra show two bands in the range 613–616 cm^?1 and 511–514 cm^?1, which are characteristic of the spinel copper chromite crystalline structure. The optical energy gaps of the CC1, CC2, and CC3 samples are 1.25, 1.88, and 1.92 eV, respectively. The synthesized nanoparticles were used for the degradation of the acid orange 7 dye under visible light irradiations. The highest % degradation was obtained at pH?2.5 and irradiation time?=?40 min. The % degradation of the acid orange 7 dye using CC1, CC2, and CC3 photocatalysts at pH?2.50 and time?=?40 min is 87.38, 96.52, and 98.81, respectively. The degradation of the acid orange 7 dye was markedly reduced with the addition of isopropyl alcohol or disodium ethylenediaminetetraacetate, confirming that the hydroxyl radicals and holes routes play a fundamental role in the degradation process of the acid orange 7 dye. The degradation of the acid orange 7 dye is slightly affected by the addition of ascorbic acid, confirming a minor concentration of oxygen anion radicals.

     

磷钼钒杂多酸的合成及其对染料废水的光催化降解性能

采用分步酸化加热回流方法合成了磷钼钒杂多酸H7[P2Mo17VO62]?39H2O,用红外光谱表征了其结构,考察了其对罗丹明B光降解的催化作用.结果表明,没有杂多酸H7[P2Mo17VO62]·39H2O催化时,单独进行紫外光照射罗丹明B降解率仅17.5%;H7[P2Mo17VO62]?39H2O催化剂浓度增加,罗丹明B的降解率升高,最高达75%.同时探讨了Dawson型杂多酸H7[P2Mo17VO62]?39H2O对有机污染物的光催化降解机理.