p区金属氧化物Ga2O3和Sb2O3光催化降解盐酸四环素性能差异

对沉淀法合成的p区金属氧化物Ga₂O₃和Sb₂O₃紫外光光催化降解盐酸四环素的性能进行了研究,讨论了制备条件对光催化性能的影响。最佳制备条件下得到的Ga₂O₃-900和Sb₂O₃-500样品光催化性能存在巨大差异,通过X射线粉末衍射、傅里叶红外光谱、N2吸附-脱附测试、荧光光谱、拉曼光谱、电化学分析及活性物种捕获实验等对样品进行分析,研究二者光催化降解盐酸四环素的机理,揭示影响光催化性能差异的本质因素。结果表明,Ga₂O₃和Sb₂O₃光催化性能差异主要归结于二者不同的电子和晶体结构、表面所含羟基数量及光催化降解机理。     

Insight into Superior Visible Light Photocatalytic Activity for Degradation of Dye over Corner-truncated Cubic Ag2O Decorated TiO2 Hollow Nanofibers

Ag2O/TiO2 heterostructure has been constructed by loading corner-truncated cubic Ag2O on the TiO2 hollow nanofibers via an electrospinning-precipitation method. Compared to individual Ag2O and TiO2, Ag2O/TiO2 heterostructure exhibits obviously enhanced photocatalytic activity for the photodegradation of methyl orange(MO) under visible light irradiation. The composite with molar ratio of Ag2O to TiO2 at 4:10 exhibits the best photocatalytic performance with MO degraded 93% in 6 min. The superior activity is mainly attributed to the surface plasmon resonance(SPR) effect of metallic Ag in-situ produced during the photocatalytic process, which can favor electron transfer to the conduction band of TiO2. This leads to the efficient separation of photogenerated carriers, thus a superior photodegradation activity. Moreover, the energy band alignments of Ag2O/TiO2 heterostructure are calculated, which provides strong support for the proposed mechanism.     

Study on the Different Photocatalytic Performances for Tetracycline Hydrochloride Degradation of p-block Metal Composite Oxides Sr1.36Sb2O_6 and Sr2Sb2O_7

p-block metal composite oxides Sr_1.36Sb₂O₆ and Sr₂Sb₂O₇ synthesized by a hydrothermal method as photocatalysts in the degradation of tetracycline hydrochloride under UV light irradiation have been extensively studied.The effects of synthesis conditions on the photocatalytic activity were discussed.The Sr_1.36Sb₂O₆-100°C-24 h-5 and Sr₂Sb₂O₇-150℃-24 h^-2 samples prepared under optimal conditions exhibited remarkably different photocatalytic activities.The essential factors influencing the difference of photocatalytic performance were revealed.The results showed that the different photocatalytic activities observed for Sr_1.36Sb₂O₆and Sr₂Sb₂O₇ could be attributed to their different electronic and crystal structures.Our work will provide a new perspective for the screening and design of p-block metal composite oxide photocatalysts to enhance the removal of organic pollutants in the environment.     

立方晶型Sb2O3纳米晶的合成及光催化性能

采用沉淀法合成了立方晶型Sb2O3纳米晶,通过X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)、紫外-可见漫反射光谱(UV-Vis DRS)和电子自旋共振谱(ESR)等对样品进行了详细的表征。以紫外光光催化降解甲基橙为反应模型评价了样品的光催化性能。结果表明:沉淀法合成的立方晶型Sb2O3纳米晶颗粒小,表现出良好的光催化性能。对立方晶型Sb2O3纳米晶光催化降解甲基橙的原因进行了探讨,并提出了降解甲基橙的反应机理。     

p区金属氧化物Ga2O3和Sb2O3光催化降解盐酸四环素性能差异

对沉淀法合成的p区金属氧化物Ga₂O₃和Sb₂O₃紫外光光催化降解盐酸四环素的性能进行了研究,讨论了制备条件对光催化性能的影响。最佳制备条件下得到的Ga₂O₃-900和Sb₂O₃-500样品光催化性能存在巨大差异,通过X射线粉末衍射、傅里叶红外光谱、N₂吸附-脱附测试、荧光光谱、拉曼光谱、电化学分析及活性物种捕获实验等对样品进行分析,研究二者光催化降解盐酸四环素的机理,揭示影响光催化性能差异的本质因素。结果表明,Ga₂O₃和Sb₂O₃光催化性能差异主要归结于二者不同的电子和晶体结构、表面所含羟基数量及光催化降解机理。     

荧光猝灭测定痕量钯

报道了Pd(Ⅱ）与碘离子进行氧化还原反应生成游离碘使异硫氰酸荧光素荧光猝灭，借此异硫氰酸荧光素为荧光指示剂间接测定钯的新方法。在pH6.00的条件下，异硫氰酸荧光素的最大激发波长为485nm；最大发射波长为515nm。钯含量在20－200ng/L范围内与体系的荧光强度有良好的线性关系；检出限为6.4ng/L。本法具有灵敏度高、费用低、操作简便、快速等优点，用于样品分析，结果令人满意。