以细菌纤维素为模板制备花状硫化铜及其光催化性能研究

以细菌纤维素（BC）为模板,硫酸铜、硫脲为原料,通过一步水热合成法得到具有三维花状结构的硫化铜（CuS）复合微球。通过XRD、SEM表征了BC/CuS复合材料的结晶结构和微观形貌,并对花状微球的形成机理进行了探究。在紫外照射条件下通过BC/CuS复合材料进行罗丹明B（RhB）的光降解实验并评估其光催化性能,结果表明,复合材料对RhB降解率高达98.2%,且重复5次后仍能保持较高的催化活性。捕捉剂实验证明超氧自由基（·O^-₂）和空穴（h⁺）是复合材料光催化降解反应中的主要活性物种。     

硫化铜/石墨烯的制备及光催化性能研究

选用溶剂热法制备了硫化铜/石墨烯纳米复合材料.通过XRD、XPS、TEM、SEM、BET、PL、UV-Vis等对该复合材料进行了表征,并进行了光催化效果分析.结果表明,硫化铜颗粒均匀地分布在石墨烯片层上.通过对染料溶液的光催化降解实验,证明该复合材料具有极好的光催化性能,经5次循环使用不影响光降解效率,有很好的稳定性,...     

硫化铜/石墨烯的制备及光催化性能研究

选用溶剂热法制备了硫化铜/石墨烯纳米复合材料。通过XRD、XPS、TEM、SEM、BET、PL、UV-Vis等对该复合材料进行了表征,并进行了光催化效果分析。结果表明,硫化铜颗粒均匀地分布在石墨烯片层上。通过对染料溶液的光催化降解实验,证明该复合材料具有极好的光催化性能,经5次循环使用不影响光降解效率,有很好的稳定性,因此在染料溶液降解方面具有较高的应用前景。     

硫化铜在低共熔溶剂中的合成及光催化研究

在四丁基氯化铵:乙二醇(1:3)低共熔溶剂中,以硫粉和铜粉为原材料,直接反应一步成功合成具有分层结构的微米级球状硫化铜。用XRD表征手段分析了合成的硫化铜的纯度、用SEM、TEM表征手段观察了硫化铜的形貌与微观结构。通过在紫外光下降解染料亚甲基蓝,探究了硫化铜的光催化性能,考察了光催化反应的影响因素。实验表明,合成的硫化铜对亚甲基蓝染料的降解有极佳的催化活性。     

3D-BiOI花状微球的制备及其可见光光催化性能

通过混合溶剂热法成功的制备了三维(3D)BiOI花状微球。通过XRD、SEM、UV-vis对样品进行了表征,结果显示:样品是由二维纳米片组装而成的分等级微球,粒径1~2μm,表面具有明显的空隙。在以甲基橙为目标降解物的光催化试验中3D-BiOI表现了优异的催化性能,1 h内对100 mL,浓度为10-5mol/L的甲基橙溶液的脱色率达到了98%。     

水热/溶剂热法制备CuS及其复合光催化材料的研究进展

纳米半导体金属硫化物因具有独特的光电性能而在有机污染物降解、光催化产氢、重金属离子还原等方面具有良好的应用前景.为此,本文综述了近年来利用水热/溶剂热法制备不同形貌纳米硫化铜及其复合材料和该类材料在光催化降解水中有机污染物、光解水产氢性能等方面的研究进展;同时,结合本课题组工作对该类材料的制备及应用前景做了展望,以期对该领域的研究有一定的促进作用.     

溶剂热法制备BiOI材料及其光催化性能研究

本文分别采用溶剂热法和水热法,以五水合硝酸铋为铋源,碘化钠为碘源,分别以无水乙醇(ETH)和去离子水(H₂O)为溶剂,将上述溶液在160℃下反应12h,成功制备了Bi OI纳米材料。利用X射线衍射仪(XRD),紫外漫反射(Uv-vis)和光致发光光谱(PL)等进行了表征和性能测试。以无水乙醇为溶剂,采用溶剂热法制备的BiOI光催化剂,表现出优异的可见光光催化活性。     

溶剂热法制备高可见光活性TiO2-BiOI光催化剂及其光催化性能研究

通过溶剂热法将TiO2均匀负载到了BiOI花状微球上，制备了TiO2-BiOI复合光催化剂。XRD，FT-IR，XPS，SEM，TEM和UV-Vis-NIR对样品进行了表征。以甲基橙为目标降解物，研究了TiO2-BiOI复合光催化剂在可见光下的光催化性能。研究结果表明，纳米TiO2的复合为增加复合光催化剂的比表面积作出了贡献，TiO2与BiOI之间形成的异质结构可以促进光生电子和空穴分离，从而达到提高复合光催化剂光催化性能的目的。Ti:Bi摩尔比为0.4的TiO2-BiOI复合光催化剂表现出最佳的光催化降解效率，可见光（λ>420 nm）照射60 min对甲基橙的降解率达到了95%，光催化效率要远好于纳米TiO2和纯的BiOI光催化剂。     

溶剂热制备ZnO微椭圆球及光催化性能

通过简便实用的溶剂热法制备出尺寸和形貌均一、单分散的纳米ZnO微椭圆球.用X-射线衍射仪、扫描电镜、氮气吸附和脱附仪和荧光光谱表征所合成的样品.通过控制实验条件来研究ZnO微椭圆球的形貌形成过程.除此之外我们还研究了ZnO微椭圆球光致发光和光催化性能.     

高可见光活性TiO2-BiOI的制备及其光催化性能

以钛酸丁酯、亚氨基二乙醇、碘化钾和五水合硝酸铋为原料,通过溶剂热法将TiO_2均匀地负载到Bi OI花状微球上,制备了TiO_2-Bi OI复合光催化剂。通过XRD、XPS、SEM、TEM和UV-Vis-DRS对样品进行了表征。以甲基橙为目标降解物,测定了TiO_2-BiOI复合光催化剂在可见光下的光催化性能。结果表明,纳米TiO_2的加入为复合光催化剂比表面积的增加作出了贡献,TiO_2与Bi OI之间形成的异质结结构可以促进光生电子和空穴分离,从而达到提高复合光催化剂光催化性能的目的。n(Ti)∶n(Bi)=0.4∶1.0的TiO_2-BiOI复合光催化剂表现出最佳的光催化降解性能,可见光(λ420 nm)照射60 min,其对甲基橙的降解率达到95%,远高于纯的TiO_2和Bi OI光催化剂。     

药物洗脱球囊制备工艺探讨

以尼龙-12球囊导管为材料,采用直接涂覆的方式制备紫杉醇药物洗脱球囊导管,考察了胶黏剂溶液浓度、紫杉醇溶液浓度、风干时间和风速对紫杉醇载药量的影响。结果表明,制备药物洗脱球囊的最佳反应条件为:胶黏剂溶液浓度为60 mg/m L,紫杉醇的浓度为12.5 mg/m L,风速为5 m/s,风干时间为35 s。     

Solvothermal synthesis of BiOCl flower-like hierarchical structures with high photocatalytic activity

Flower-like BiOCl hierarchical structures were successfully synthesized in the presence of citric acid through a solvothermal process using methanol as a solvent. The citric acid played significant roles, which functioned as both a chelating regent and a structure-directing agent. The as-synthesized flower-like BiOCl particles were assembled by numerous BiOCl nanosheets with a thickness of ca. 15–20 nm. Importantly, such a flower-like BiOCl morphology exhibited a higher photocatalytic activity than that of commercial TiO₂ in degradation of methyl orange under either UV light or simulated sunlight illumination.     

BiOBr-TiO_2的醇热法合成及光催化活性的研究

采用简单的醇热法制备了BiOBr-TiO_2系列纳米复合材料,研究其对染料罗丹明B(Rh B)和无色小分子水杨酸(SA)的光催化特性。结果表明,在可见光照射下(λ≥420 nm),该系列光催化剂对有机污染物均具有良好的光催化降解性能,随材料制备体系中异丙醇钛加入量的增加,催化剂的吸附性能和光催化性能都有较大改变。其材料制备体系中钛铋摩尔比为1∶1时,制备的催化剂BiOBr-TiO_2-1.0在吸附平衡时可吸附40%的RhB,加光后10 min,即可使溶液中的Rh B完全褪色,表现出优良的吸附和光催化性能。采用光谱分析跟踪测定光催化反应过程中氧化物种的变化,表明催化过程主要涉及超氧自由基(O_2·~-)的氧化,同时空穴也直接参与底物的氧化过程。     

Synthesis of CuS and CuS/ZnS core/shell nanocrystals for photocatalytic degradation of dyes under visible light

High quality CuS and CuS/ZnS core/shell nanocrystals (NCs) were synthesized in a large quantity using a facile hydrothermal method at low temperatures of 60 °C and evaluated in the photodegradation of Rhodamine B (RhB) under visible light irradiation. Synthesis time plays an important role in controlling the morphology, size and photocatalytic activity of both CuS and CuS/ZnS core/shell NCs which evolve from spherical shaped particles to form rods with increasing reaction time, and after 5 h resemble “flower” shaped morphologies in which each “flower” is composed of many NCs. Photocatalytic activity originates from photo-generated holes in the narrow bandgap CuS, with encapsulation by large bandgap ZnS layers used to form the core/shell structure that improves the resistance of CuS towards photocorrosion. Such CuS/ZnS core/shell structures exhibit much higher photocatalytic activity than CuS or ZnS NCs alone under visible light illumination, and is attributed to higher charge separation rates for the photo-generated carriers in the core/shell structure.     

BiOBr-TiO_2的醇热法合成及光催化活性的研究

采用简单的醇热法制备了BiOBr-TiO_2系列纳米复合材料,研究其对染料罗丹明B(Rh B)和无色小分子水杨酸(SA)的光催化特性。结果表明,在可见光照射下(λ≥420 nm),该系列光催化剂对有机污染物均具有良好的光催化降解性能,随材料制备体系中异丙醇钛加入量的增加,催化剂的吸附性能和光催化性能都有较大改变。其材料制备体系中钛铋摩尔比为1∶1时,制备的催化剂BiOBr-TiO_2-1.0在吸附平衡时可吸附40%的RhB,加光后10 min,即可使溶液中的Rh B完全褪色,表现出优良的吸附和光催化性能。采用光谱分析跟踪测定光催化反应过程中氧化物种的变化,表明催化过程主要涉及超氧自由基(O_2·^-)的氧化,同时空穴也直接参与底物的氧化过程。     

Morphology and photocatalytic activity of TiO2/MXene composites by in-situ solvothermal method

In this work, TiO₂/MXene composites were successfully synthesized through an in-situ solvothermal method, where the morphology of TiO₂ nanoparticles (NPs) was modified by different concentrations of agents. Ti₃C₂T_x with electronic storage characteristics was employed as a co-catalyst to enhance the photocatalytic degradation activity by capturing photogenerated electrons. The experimental results reveal that, with the help of C₃H₈O agents, TiO₂ NPs are uniformly distributed on the surface of Ti₃C₂T_x. The TiO₂/Ti₃C₂T_x-C₃H₈O composite showed the highest photocatalytic activity of 90.5% after 75 min under mercury light irradiation, which is 57.9% higher than that of the pure TiO₂ photocatalyst. The photocatalytic activity is promoted due to the high photoelectron transmission performance of the TiO₂/Ti₃C₂T_x composites.     

A novel photocatalyst AgBr/ZnO/RGO with high visible light photocatalytic activity

A novel ternary photocatalyst AgBr/ZnO/RGO, where AgBr/ZnO is supported on reduced graphene oxide, is synthesized via a facile hydrothermal–impregnation method. The resultant composite presents a lamellar structure with AgBr nanoparticles homogeneously dispersing on the surface. The photocatalytic experiment for methyl orange dye degradation under visible light irradiation shows that ternary composite AgBr/ZnO/RGO has an activity 12.8 times and 2.3 times higher than binary photocatalysts ZnO/RGO and AgBr/ZnO respectively. More importantly, the ternary composite also demonstrates a good photostability. Metallic Ag is produced during the photocatalytic process, which may serve as the electron transfer mediator in the vectorial Z-scheme transfer of photogenerated charge carriers at the interface of AgBr/ZnO/RGO. The effective separation of photogenerated electrons and holes was proposed to be responsible for the enhancement of visible light photoactivity.     

Synthesis and catalytic activity of flower-like CuS by elemental-direct-reaction in amide-based room temperature ternary eutectic melt

Micron-sized flower-like copper sulfide (CuS) has been successfully synthesized via an elemental-direct-reaction route in an amide-based ternary eutectic melt at room temperature (25°C). The characterization results from X-ray diffraction pattern, scanning electron microscopy images and energy-dispersive X-ray spectroscopy reveal that the as-synthesized product was pure hexagonal phase flower-like CuS microspheres (about 500?nm in diameter). A possible formation mechanism of CuS flower-like structure has been proposed. Moreover, the as-prepared CuS samples were applied to decompose ammonium perchlorate (AP) and the role of CuS in the process also has been explained.     

ZnO/BiOCl复合材料的制备及其可见光催化性能研究

为提高BiOCl在可见光下的光催化性能,通过水解法合成了一系列复合ZnO的BiOCl样品,采用X射线粉末衍射仪、扫描电镜和紫外-可见分光光度仪对制得的催化剂的形貌、结构、物相组成以及光学性能进行了表征,通过降解罗丹明B对样品的光催化性能进行研究。结果表明,复合ZnO后可有效提高BiOCl的光催化活性,其中1Zn/20Bi的光催化活性最高,115 min内可见光降解罗丹明B的降解率达99%。通过研究机理发现,ZnO纳米异质结构不仅负责较高的可见光光催化活性,它在分离光产生的空穴和电子也起着至关重要的作用。     

ZnO/BiOCl复合材料的制备及其可见光催化性能研究

为提高BiOCl在可见光下的光催化性能,通过水解法合成了一系列复合ZnO的BiOCl样品,采用X射线粉末衍射仪、扫描电镜和紫外-可见分光光度仪对制得的催化剂的形貌、结构、物相组成以及光学性能进行了表征,通过降解罗丹明B对样品的光催化性能进行研究。结果表明,复合ZnO后可有效提高BiOCl的光催化活性,其中1Zn/20Bi的光催化活性最高,115 min内可见光降解罗丹明B的降解率达99%。通过研究机理发现,ZnO纳米异质结构不仅负责较高的可见光光催化活性,它在分离光产生的空穴和电子也起着至关重要的作用。