Sonochemical Preparation of Micro-and Nanometer Cu2O

Cu2O particles with different morphologies and scales were prepared sonochemically on the solid-liquid interface of CuCl and water, by adjusting the reaction factors. The products were characterized by powder X-ray diffraction(XRD) and scanning electron microscopy(SEM). The formation and morphology of Cu2O crystals were influenced by high-intensity ultrasound,reaction temperature,and addition of CuCl.The results indicate that micrometer Cu2O was crystallized in cubic and octahedral shapes, whereas, nanometer Cu2O was not produced in well-shaped crystals.     

Cu2O nanocrystals with various morphology: Synthesis,characterization and catalytic properties

Cu₂O nanocubes, octahedra, spheres and truncated rhombic dodecahedral were prepared and their structural, morphological, and electronic properties were investigated by X-ray diffraction analysis, X-ray absorption near edge structure, scanning electron microscope and transmission electron microscope and X-ray absorption near edge structure. Cu₂O nanocrystals were successfully employed to catalyze the 1,3-dipolar cycloaddition reaction for the synthesis of 1,4-disubstituted triazoles. Cu₂O nanocubes and octahedral showed the superior catalytic performance in the cycloaddition reaction. These results reveal that crystal-plane engineering of oxide catalysts is a useful strategy for developing efficient catalysts for organic reaction.     

不同预处理的氧化亚铜纳米线电极诱导的晶面效应提升电化学CO2还原为多碳产物

近年来,由于化石燃料不断消耗造成的二氧化碳气体过量排放,对人类生活环境造成越来越大的威胁.电催化二氧化碳还原反应是一种很有前景的解决方法,可回收废弃的二氧化碳并通过将其转化为可再生的燃料和化学品来最终实现碳循环.在各种还原产物中,多碳化学产物因其具有高能量密度和高商业价值而备受青睐.然而,由于涉及多个复杂的反应途径,设...     

A Solvothermal Route to Cu2O Nanocubes and Cu Nanoparticles

IntroductionSynthesis of Cu2O and Cu nanostructures has beenactively researched for many decades because bothCu2O and Cu are important industrial materials on ac-count of their novel physical and chemical properties.In particular,Cu2O is a p-type metal ox…     

Cr掺杂Cu2O的光催化性质的第一性原理研究

采用第一性原理计算的方法,研究了不同浓度及不同位置Cr掺杂Cu₂O体系的缺陷形成能、电子结构和可见光区域的光催化性质及产生机理。结果表明,本征Cu₂O显示半导体特性,在可见光区域吸收很弱;不同浓度、不同位置的Cr掺杂体系均是稳定的,显示金属特性。与本征Cu₂O相比,随着Cr掺杂浓度的增大,体系在可见光范围内的吸收峰均有不同程度的增强,并且两个Cr原子近邻掺杂时可见光区域的吸收系数最大,光催化效率最强。态密度分析发现,Cr掺杂体系在可见光范围的吸收主要由Cr 3d态电子的带内跃迁产生;不同掺杂浓度和结构构型主要影响材料在长波长段的物理性质,而对短波长段的性质影响很小。因此,通过增大Cr掺杂浓度及调控掺杂位置可以提高Cu₂O在可见光区域的光催化效率,推动Cu₂O在光催化方面的发展。     

复合半导体MoS_2/Cu_2O的制备及其光催化性能研究

采用两步法制备了MoS_2/Cu_2O催化剂,对其催化降解甲基橙(MO)性能进行了研究.首先,通过液相剥离和梯度离心获得少数层MoS_2纳米片,然后采用水热还原法在MoS_2纳米片上合成Cu_2O纳米颗粒,形成MoS_2/Cu_2O复合半导体,并分别通过扫描电子显微镜(SEM)、X射线衍射(XRD)、X射线光电子能谱(XPS)、UV-Vis紫外可见漫反射光谱(DRS)等手段对催化剂的结构进行表征.在可见光下,MoS_2/Cu_2O复合半导体降解MO的效率明显高于纯MoS_2和Cu_2O.为了获得最佳光催化活性,探究了MoS_2质量分数(5%、10%、20%、30%、40%、50%)对MoS_2/Cu_2O复合半导体光催化降解MO的影响.最后,经过5次循环实验,MoS_2/Cu_2O降解率下降为82.5%,循环稳定性有待进一步提高.     

溶剂热合成Cu2O微球及其对高氯酸铵热分解的催化作用

以聚乙烯吡咯烷酮(PVP)为添加剂,利用溶剂热法合成了Cu2O微球.考察了PVP用量以及反应温度对产物形貌的影响,并在反应时间为2.5与4.5h时分别合成了直径为100-200nm和1μm的Cu2O微球.同时,利用差热分析(DTA)技术考察了不同直径的Cu2O微球对高氯酸铵(AP)热分解的催化效果,结果表明:添加2%(w)的直径为100-200nm和1μm的Cu2O微球使得AP的高温分解温度分别降低了116和118°C,AP在低温阶段的分解量也明显提高.     

PEG还原Cu(Ⅱ)制备Cu2O纳米立方晶

Cuprous oxide (Cu₂O) nanocubes have successfully been prepared through a simple and novel method by heating Cu(ethyl acetoacetate)₂ (Cu(EAC)₂) and poly(ethyleneglycol) (PEG) in the absence of other chemicals. The PEG acted as the reducing agent as well as the stabilizer. The XRD results indicated that no metal Cu or CuO developed in the preparation process, and only Cu₂O nanoparticles with the cuprous structure were produced. The TEM images revealed that all the Cu₂O nanoparticles were cubic-shaped or square-shaped particles. The size and shape of Cu₂O nanocubes were dependent on concentrations of the Cu(Ⅱ) precursor, reactant temperatures, and chain length of PEGs. It is interesting that the reducing reactivity of PEG was sensitive to its chain length, and the reduction reaction activity was drastically dropped with the decreasing of polymer′s chain length.     

TiO2/Cu2O/Pt复合空心微球的制备及其光催化性能

以锐钛矿相TiO₂溶胶为基底,采用沉淀法和液相沉积法制备了TiO₂/Cu₂O/Pt复合空心微球,通过改变n_Ti⁴⁺∶ n_Cu²⁺和H₂PtCl₆·6 H₂O溶液的加入量对TiO₂的形貌和结构进行调控,采用不同的方法对不同样品的物相及结构、微观形貌和光学性能进行了对比分析。分析结果表明,复合材料中Pt与Cu₂O的引入产生协同效应,不仅在一定程度上阻止了电子-空穴的复合,还降低了禁带宽度,在可见光区域光吸收明显增强。与TiO₂、Cu₂O和TiO₂/Cu₂O光催化剂相比较,TiO₂/Cu₂O/Pt降解有机污染物的能力显著增强,首次光照120 min可降解93%的甲基橙(MO)溶液,4次循环后降解率为71%,具有良好的光催化稳定性能。     

TiO2/Cu2O/Pt复合空心微球的制备及其光催化性能

以锐钛矿相TiO₂溶胶为基底,采用沉淀法和液相沉积法制备了TiO₂/Cu₂O/Pt复合空心微球,通过改变n₍Ti⁴⁺)∶n_Cu2+和H₂Pt Cl₆·6H₂O溶液的加入量对TiO₂的形貌和结构进行调控,采用不同的方法对不同样品的物相及结构、微观形貌和光学性能进行了对比分析。分析结果表明,复合材料中Pt与Cu₂O的引入产生协同效应,不仅在一定程度上阻止了电子-空穴的复合,还降低了禁带宽度,在可见光区域光吸收明显增强。与TiO₂、Cu₂O和TiO₂/Cu₂O光催化剂相比较,TiO₂/Cu₂O/Pt降解有机污染物的能力显著增强,首次光照120 min可降解93%的甲基橙(MO)溶液,4次循环后降解率为71%,具有良好的光催化...     

氧化亚铜单晶的声化学制备及表征(英)

So far,m any im portant sem iconductor m aterialssuch as ZnO,SnO2,Cu2O,In2O3have been synthesizedby using a variety of techniques including sol-gelm ethod[1],direct oxidation m ethod[2],m icrowave irradia-tion[3,4],sonochem ical m ethod[5],solution disper…     

n型Cu2O薄膜的简易水热法制备及其光电化学性能

采用一种简单的水热法,通过控制反应时间,使用铜片在只含有Cl~-的非含铜前驱物的NaCl溶液中生长出了n型Cu_2O薄膜。对制备的样品进行了X射线衍射(XRD)、拉曼光谱(Raman)、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)和光电化学等表征或测试。本水热法相对其他的水热法工艺更简单,成本更低且能进行快速大规模化的生产。且得到的n型Cu_2O薄膜晶化程度高,经过Cl~-掺杂后,载流子浓度高达9.75×10~(17) cm~(-3),在可见光照射下表现出较好的光电转换性能。光电化学和电化学阻抗谱表明在中等浓度(0.1 mol·L~(-1))NaCl溶液中90℃的条件下水热反应50 h制备的Cu_2O薄膜具有最好的光电性能。     

高反应浓度下制备不同形貌氧化亚铜的简易方法

在常压,70 ℃,高反应浓度和不加任何添加剂的条件下,硫酸铜经与NaOH反应后用葡萄糖还原获得了球形、立方体、多面体、星形和正八面体形貌的Cu₂O粒子。用X射线粉末衍射,扫描电镜和激光粒度仪对所制备的产品进行了表征。改变反应原料的加料方式和NaOH的浓度可获得不同形貌的Cu₂O粒子。在恒温下先加NaOH溶液再加浓度为0.1 g·mL^-1的葡萄糖溶液的分步加料方式下,当NaOH的浓度依次为0.15、0.225、0.3和0.45 g·mL^-1时分别得到立方体、多面体、星形、和正八面体;在室温下,NaOH 和葡萄糖分步加料后程序升温,得到球形;恒温,氢氧化钠和葡萄糖同时加料方式下产物主要为球形。     

不同形貌的Cu_2O:可控合成及光学性质(英文)

Cuprous oxide(Cu₂O) hexapodal branch structure with high uniformity was prepared by a solution phase route using sodium dodecyl sulfate as a capping agent. The shapes of Cu₂O crystal(flower-like structure, nanocube and nanoplate) were tuned by varying species and concentrations of surfactants to control the growth rate on different crystal planes of Cu₂O. Cu₂O nanostructures were characterized by UV-Vis spectroscopy, XRD, TEM and SEM. XRD result shows that the obtained Cu₂O belongs to cubic phase. TEM and SEM results demonstrate that specie and concentration of surfactants play a key role in the formation of various morphologies of Cu₂O. The formation mechanism is discussed. Moreover, the optical properties of the obtained Cu₂O are shape-dependent.     

Cu2O/CNTs复合材料的制备及其光催化性能

以乙二醇为还原剂,采用溶剂热法在混酸(V_(H_2SO_4)/V_(HNO_3)=3∶1)超声处理的碳纳米管(CNTs)表面负载氧化亚铜(Cu_2O),通过改变CNTs的含量制备出球形Cu_2O/CNTs复合材料。采用X射线衍射(XRD)、傅里叶变换红外光谱(FTIR)、扫描电镜(SEM)、能谱分析(EDS)、N_2吸附-脱附、紫外-可见光漫反射(DRS)、有机总碳量(TOC)等对Cu_2O/CNTs进行表征;研究CNTs含量对Cu_2O/CNTs复合材料的结构、形貌、比表面积与孔径、光吸收特性的影响;结合光催化机理讨论CNTs对Cu_2O/CNTs光催化性能的影响。结果表明,当CNTs含量为0.2 g时,Cu_2O/CNTs的光催化性能最佳,在可见光照射60 min后,对甲基橙的降解率达到92.1%。     

Cu2O亚微米空心球的低共熔溶剂辅助合成与表征

以低共熔溶剂(DESs)/H2O混合溶剂为介质成功制备了形貌均一、尺寸小且稳定性高的亚微米Cu2O空心球。采用扫描电镜、透射电镜和X射线衍射等方法表征了所制备样品的形貌、尺寸和结构。同时,研究了温度、p H、聚乙烯吡咯烷酮(PVP)用量等因素对样品尺寸、形貌及纯度的影响。结果表明,制备高纯Cu2O空心球的优化工艺条件为40℃、p H=11和PVP用量0.9g。混合溶剂中DESs的存在对提高所制备Cu2O样品的纯度、形态均一性和稳定性以及缩小颗粒的尺寸起到了重要作用。     

Cu2O/Ag纳米复合材料的绿色制备与抗菌性能研究

以乙酸铜为铜源、硝酸银为银源并利用天然蜂蜜为还原剂在无模板剂无需高压反应釜的条件下,环保地、简便地制备了Cu_2O/Ag复合材料。并采用X射线衍射、扫描电镜对材料的结构与形貌进行了表征。通过抑菌圈法证明Cu_2O/Ag复合材料相比Cu_2O对大肠杆菌有着更好的抑菌性能,通过分析Cu_2O/Ag对大肠杆菌生长过程的影响发现,当Cu_2O/Ag复合材料的浓度达到10μg/m L时,Cu_2O/Ag复合材料能够彻底抑制大肠杆菌的生长。通过SEM观察了Cu_2O/Ag复合材料对大肠杆菌作用过程中菌种形貌的变化表明,Cu_2O/Ag复合材料对大肠杆菌的抗菌作用过程是先破坏细胞膜结构使细菌断裂成小段,这些小段颗粒逐渐皱缩进而彻底被分解为大分子物质。本文制备的Cu_2O/Ag复合材料在抗菌剂领域具有潜在的应用价值。     

氨基修饰的金属有机框架Cu_3(BTC)_2的制备及其CO_2吸附性能研究

首先制备了嫁接氨基的均苯三甲酸,同时以其为原料通过溶剂热法合成了金属有机框架材料Cu_3(NH_2BTC)_2,利用XRD、N_2吸附-脱附、热重、红外、原位红外分析等表征手段对吸附剂进行了表征,并通过固定床测量穿透曲线的方法研究其CO_2吸附性能。结果表明,氨基被成功引入Cu_3(BTC)_2骨架中。氨基修饰的Cu_3(BTC)_2对CO_2有着较高的吸附容量,在10 kPa,50℃的条件下CO_2吸附量为1.41 mmol/g,这源于材料对于CO_2同时存在着物理吸附和化学吸附。     

Effect of kcl on cucl2/γ-al2o3 catalyst for oxychlorination of ethane

Summary Effect of KCl on the structure and the catalytic properties of CuCl₂/γ-Al₂O₃ catalyst for ethane oxychlorination has been studied by means of solubility test, UV-vis spectroscopy, XRD, TPR, TEM and catalytic reaction. Addition of KCl decreases the interaction between active species CuCl₂ and γ-Al₂O₃ and increases the catalytic properties by accelerating the Cu(II) → Cu(I) reduction step.     

不同表面形貌Cu2O空心球的制备及光催化性能

采用一步溶剂热法,以Cu(NO_3)_2·3H_2O为铜源,乙二醇(EG)为还原剂,聚乙烯吡咯烷酮(PVP)为表面活性剂,高温条件下制备形貌可控的Cu_2O空心球纳米材料。研究Cu(NO_3)_2·3H_2O与PVP的质量比值(w_(Cu(NO_3)_2·3H_2O)/w_(PVP))对Cu2O结构、形貌、比表面积以及光吸收特性的影响,并结合光催化机理讨论其对Cu_2O光催化性能的影响。此外,通过改变反应时间来研究Cu_2O的生长过程。结果表明,w_(Cu(NO_3)_2·3H_2O)/w_(PVP)=45时,得到的形貌为空心球表面覆盖纳米刺的Cu_2O纳米材料光催化性能最佳,在可见光辐照10 min的条件下,对甲基橙的降解率达94.3%。