Cd0.5Zn0.5S/MoO3复合材料光催化降解甲基橙

以MoO3、Cd0.5Zn0.5S、聚乙烯吡咯烷酮为原料,水热一锅法制备了Cd0.5Zn0.5S/MoO3复合材料,通过XRD、XPS、SEM、UV-Vis DRS及PL对复合材料的结构、形貌以及光学性能进行了表征.在可见光照射下,将其用于甲基橙(MO)、罗丹明B、亚甲基蓝、孔雀石绿、酸性品红、结晶紫的光催化降解.结果表明,MoO3/Cd0.5Zn0.5S复合材料对上述染料都具有光催化降解能力,其中,对MO的光催化活性最佳.可见光照射60 min,质量浓度0.67 g/L的10％Cd0.5Zn0.5S/MoO3(Cd0.5Zn0.5S含量为10％,以MoO3质量计)对质量浓度10 mg/L MO的降解率达到98.0％,表观速率常数为0.06725 min–1,分别约为MoO3和Cd0.5Zn0.5S的172倍和31倍.     

MoO3/Cd0.5Zn0.5S复合材料光催化降解甲基橙

以MoO3、Cd0.5Zn0.5S、聚乙烯吡咯烷酮（PVP）为原料,水热一锅法制备了复合材料MoO3/Cd0.5Zn0.5S,通过XRD、XPS、SEM、UV-Vis DRS及PL对复合材料的结构、形貌以及光学性能进行了表征。可见光照射下,MoO3/Cd0.5Zn0.5S复合材料对甲基橙（MO）、罗丹明B、亚甲基蓝、孔雀石绿、酸性品红等染料具有光催化降解能力,其中对MO的光催化活性最佳。结果表明,可见光照射60 min,0.67 L/g 10%Cd0.5Zn0.5S/MoO3对MO的降解率达到98.0%,反应速率常数为0.06725 min-1,分别为MoO3和Cd0.5Zn0.5S 光降解MO的169倍和31倍。     

石墨烯负载二氧化钛复合材料及光催化降解甲基橙

以天然鳞片石墨为原料,用改进的Hummers法氧化制备氧化石墨烯,然后用葡萄糖还原制得石墨稀,再用溶胶一凝胶法复合制备了TiO2／2;墨烯的复合材料。用FI-IR、Raman、AFM、SEMvR）3LTGA对石墨烯和TiO2／2;墨烯复合材料进行了表征,并在紫外光照射条件下对比石墨烯、TiO2、TiO：／2;墨烯复合材料对甲基橙的降解效果。结果表明,在紫外光照射下,TiO2的负载率为35％时,TiO2／2;墨烯复合材料光催化降解甲基橙的催化效率明显大于单纯TiO2及石墨烯,光催化4小时后,脱色率达到85％。TiO2／2;墨烯复合材料不失为一种有潜力的光催化降解染料废水催化材料。     

二氧化钛薄膜光催化降解甲基橙

用常压气相沉积法镀出的二氧化钛薄膜为光催化剂,以紫外灯为光源,降解甲基橙稀水溶液. 实验表明：镀膜时基片种类、沉积温度、在染料溶液中加Fe3+和H2O2、光照时间及气体体积流速均对甲基橙的降解率有影响,并且找到了最佳的镀膜条件.     

纳米ZnO光催化降解甲基橙

以ZnSO4·7H2O和Na2CO3为原料,采用沉淀法制备纳米ZnO粉体。以甲基橙为研究对象,高压汞灯为光源,研究了催化剂用量、甲基橙初始浓度及煅烧温度对甲基橙降解率的影响。     

光催化降解甲基橙的研究

采用TiO2为催化剂,研究了光催化降解甲基橙的影响因素。结果表明:紫外光是比较有效的辐射光源;甲基橙溶液质量浓度为6 mg/L、TiO2加入量为0.5 g/L、pH值为2时,甲基橙降解率最大;添加少量的Fe3 可提高甲基橙的降解率,其最佳投加量为0.1 mmol/L。利用光催化降解有机染料废水具有广阔的发展前景。     

聚乙烯亚胺修饰坡缕石/CaIn2S4复合材料光催化降解甲基橙

以聚乙烯亚胺(PEI)修饰的坡缕石(PGS)[记为PGS(PEI)]、CaIn₂S₄前驱体为原料,一锅水热法制备了PGS(PEI)/CaIn₂S₄复合材料,通过XRD、SEM、N2吸附-脱附、UV-VisDRS及PL表征了复合材料的物化性能,阐述了该复合材料的生长机制,测试了PGS(PEI)/CaIn₂S₄复合材料光催化降解多种染料的可行性。结果表明,PGS(PEI)镶嵌在纳米花CaIn₂S₄的内部,PGS(PEI)质量分数为60%的PGS(PEI)/CaIn₂S₄复合材料[记为60%PGS(PEI)/CaIn₂S₄]的比表面积、孔容、孔径分别为138.59 m2/g、0.49 cm3/g、14.21 nm。PGS(PEI)与CaIn₂S₄之间的内置电场及PEI对光生电子的迁移提高了...     

WO_3/ZnO的制备及其光催化降解甲基橙研究

以ZnSO4·7H2O、WO3和C2H2O4为起始原料,采用直接沉淀法制备了复合光催化剂WO3/ZnO。以甲基橙为研究对象,800W氙灯为光源,研究了催化剂煅烧温度、催化剂用量、WO3含量以及甲基橙初始浓度对其催化性能的影响。结果表明,WO3含量为15%,460℃煅烧3h所得的WO3/ZnO效果较好,在浓度为10mg/L的甲基橙溶液中加入WO3/ZnO1g/L,光照90min后脱色率可高达97.98%,且重复使用6次后脱色率仍在82%以上,表明WO3/ZnO复合光催化剂具有较好的催化性能和稳定性。     

纳米TiO_2/硅藻土复合材料光催化降解甲基橙的研究

以提纯硅藻土为载体原料,钛酸四丁酯为TiO_2前驱体,采用溶胶-凝胶法制备纳米TiO_2/硅藻土复合材料。通过XRD、SEM对复合材料晶型结构和形貌表征分析,以甲基橙为目标污染物,考察复合材料对甲基橙光催化性能影响。结果表明,TiO_2负载量为37.67%制备的复合材料光催化活性最好,TiO_2为锐钛矿和金红石混晶型。甲基橙溶液初始浓度为10 mg/L,催化剂用量为2 g/L,pH=2时,甲基橙溶液降解效果最好。     

纳米TiO_2/硅藻土复合材料光催化降解甲基橙的研究

以提纯硅藻土为载体原料,钛酸四丁酯为TiO_2前驱体,采用溶胶-凝胶法制备纳米TiO_2/硅藻土复合材料。通过XRD、SEM对复合材料晶型结构和形貌表征分析,以甲基橙为目标污染物,考察复合材料对甲基橙光催化性能影响。结果表明,TiO_2负载量为37.67%制备的复合材料光催化活性最好,TiO_2为锐钛矿和金红石混晶型。甲基橙溶液初始浓度为10 mg/L,催化剂用量为2 g/L,pH=2时,甲基橙溶液降解效果最好。     

Photocatalytic degradation of methyl orange using polythiophene/titanium dioxide composites

Polythiophene/titanium dioxide (PT/TiO₂) composites were prepared via in situ chemical oxidative polymerization, and the obtained composites were characterized by X-ray photoelectron spectroscopy (XPS), ultraviolet–visible (UV–Vis) diffuse reflectance spectroscopy (DRS) and transmission electron microscopy (TEM). Using methyl orange (MeO) as a target pollutant, the adsorption capacities and the photocatalytic activities of the resulting composites were investigated. The results indicate that PT/TiO₂ composites have good adsorption capacities due to the electrostatic attraction between the positively charged composite particles’ surfaces and MeO; the incorporation of PT into the composites enhances the photocatalytic degradation activity for MeO under both UV and visible light.     

电气石原位组装纳米TiO2降解甲基橙染料废水研究

本研究采用溶胶-凝胶法在天然铁电气石微粒表面原位组装纳米TiO2,实现天然电气石微粒对纳米TiO2固定和功能增强的双重目的.XRD结果表明,TiO2/电气石复合材料的主要物相组分是锐钛矿型TiO2,其原生颗粒尺寸为45.79nm.SEM显微形貌观察发现,纳米TiO2均匀地固定在天然铁电气石微粒表面.光催化实验表明,天然铁电气石可有效提高纳米TiO2的光催化活性,在一定条件下,甲基橙染料溶液的脱色率可达到100％.电气石含量为2％的复合材料光催化活性最高;甲基橙溶液初始浓度越小,光催化活性越高;复合光催化剂的最佳用量是3.0g·L-1.     

活性炭纤维负载二氧化钛复合催化剂降解甲基橙性能研究

制备了活性炭纤维负载二氧化钛复合催化剂ACF/TiO2,并在紫外光下降解甲基橙以考察其催化活性。并在同等条件下,对未负载二氧化钛的活性炭纤维空白样品进行了对比实验;同时还考察了ACF/TiO2的循环使用寿命。结果表明,ACF/TiO2降解能力大于未负载的活性炭纤维,其降解能力是吸附性能和光催化性能的协同作用,并拥有较长的循环使用寿命。     

Near-infrared emitting CdTe0.5Se0.5/Cd0.5Zn0.5S quantum dots: synthesis and bright luminescence

We present how CdTe_0.5Se_0.5 cores can be coated with Cd_0.5Zn_0.5S shells at relatively low temperature (around 200°C) via facile synthesis using organic ammine ligands. The cores were firstly fabricated via a less toxic procedure using CdO, trioctylphosphine (TOP), Se, Te, and trioctylamine. The cores with small sizes (3.2-3.5 nm) revealed green and yellow photoluminescence (PL) and spherical morphologies. Hydrophobic core/shell CdTe_0.5Se_0.5/Cd_0.5Zn_0.5S quantum dots (QDs) with tunable PL between green and near-infrared (a maximum PL peak wavelength of 735 nm) were then created through a facile shell coating procedure using trioctylphosphine selenium with cadmium and zinc acetate. The QDs exhibited high PL efficiencies up to 50% because of the formation of a protective Cd_0.5Zn_0.5S shell on the CdTe_0.5Se_0.5 core, even though the PL efficiency of the cores is low (≤1%). Namely, the slow growth process of the shell plays an important role for getting high PL efficiencies. The properties of the QDs are largely determined by the properties of CdTe_0.5Se_0.5 cores and shells preparation conditions such as reaction temperature and time. The core/shell QDs exhibited a small size diameter. For example, the average diameter of the QDs with a PL peak wavelength of 735 nm is 6.1 nm. Small size and tunable bright PL makes the QDs utilizable as bioprobes because the size of QD-based bioprobes is considered as the major limitation for their broad applications in biological imaging.     

磷钨酸借自然光催化甲基橙溶液降解脱色的研究

研究了以磷钨酸为光催化剂,在自然光照条件下模拟染料废水甲基橙溶液的光催化脱色性能。实验结果表明,催化剂类型,光照条件,催化剂的投入量,甲基橙的初始浓度,光照时间以及光照强度是影响甲基橙溶液脱色率的重要因素。当磷钨酸的浓度为2.0 g/L,甲基橙的初始浓度为10 mg/L,自然光照时间为2.5 h时,甲基橙溶液的脱色率可达95.9%。     

二甲酚橙溶液光催化处理研究

印染废水的治理是水系环境治理的重点,将TiO2作为光催化剂用于印染污水治理引起了人们的高度重视。本实验用水解法制备纳米TiO2光催化剂,并用其对二甲酚橙溶液进行降解。TiO2焙烧温度为300℃、溶液pH值为2.4,溶液初始浓度为20 mg/L,降解时间为30 m in时,二甲酚橙溶液降解率最高可达97.6%,该催化剂重复使用10次后仍保持较好的催化活性,对二甲酚橙溶液的降解率仍超过85%。     

负载型光催化膜降解高浓度甲基橙溶液

以负载型TiO2/活性炭光催化膜降解高浓度甲基橙水溶液为处理体系,研究了负载膜型与微粉型光催化剂降解活性,考察了催化剂用量、溶液初始质量浓度、溶液pH值等对降解性能的影响。探讨了初始质量浓度对降解反应动力学的影响,确定了降解反应级数为一级,得出了不同初始质量浓度下的反应半衰期表示式。     

TiO2混晶负载磷钨酸借自然光照对甲基橙的脱色性能研究

研究了以TiO2混晶负载磷钨酸为光催化剂,在光照条件下模拟染料废水甲基橙溶液的光催化脱色性能。实验结果表明:催化剂的投入量,甲基橙的初始浓度,光照时间是影响甲基橙溶液脱色率的重要因素。当H3PW12O40/TiO2催化剂用量为1.5 g/L,甲基橙的初始浓度为10 mg/L,光照时间为2.5 h时,甲基橙溶液的脱色率可达97.9%。     

Photocatalytic removal of methyl orange in an aqueous solution by a WO3/TiO2 composite film

WO₃/TiO₂ composite film was prepared by microarc oxidation technique and characterized by SEM, XRD, UV-vis spectra and Zeta-potential. The photocatalytic activity of WO₃/TiO₂ composite film was evaluated by examining the degradation of methyl orange. The influence of solution pH and inorganic anions on removal ratio of methyl orange was investigated. Removal ratio of methyl orange decreased with an increase of pH value in acidic solution, while it increased with the pH value in alkaline solution. The influence of added anions on the removal ratio is divided into two aspects. Addition of Cl^? and SO ₄ ^2? resulted in a decrease in photocatalytic removal ratio of methyl orange, while it was facilitated by PO ₄ ^3? , HCO ₃ ^? and NO ₃ ^? .