ZnO/煤矸石复合光催化剂的制备与性能研究

以ZnSO_4、煤矸石和NaOH为原料,采用沸腾回流法制得了一系列不同质量比的ZnO/煤矸石复合光催化剂。用X射线衍射仪、场发射扫描电子显微镜及紫外-可见漫反射光谱等多种手段对产物进行表征。以甲基橙和亚甲基蓝为目标降解物,考察了紫外光照下样品的光催化效果。结果表明,将球形ZnO负载于改性煤矸石表面可有效提高其光催化活性,且ZnO/煤矸石复合光催化剂的性能与ZnO的含量有关,当ZnO与煤矸石的质量比为10:100时,样品的光催化效果最佳,120 min内几乎将甲基橙和亚甲基蓝完全降解。此外,ZnO/煤矸石复合光催化剂还具有可重复使用的特点。     

电气石/H_2O_2体系对亚甲基蓝降解的试验研究

利用电气石/H2O2的协同作用,研究了该催化体系对亚甲基蓝溶液的降解及其反应动力学.研究结果表明:电气石/H2O2在中性条件下对亚甲基蓝具有较好的降解作用,降解率可达92%以上,COD去除率大于70%.亚甲基蓝的降解率与电气石投加量、H2O2用量、反应时间和反应温度呈正相关性;COD去除率随反应时间的增加而增加,但两者的增加幅度都逐渐变缓.电气石重复使用对亚甲基蓝的降解率影响不明显.反应动力学结果表明,电气石/H2O2体系降解亚甲基蓝废水的反应为拟一级反应.     

高岭土制备镍钴负载复合光催化剂及其对废水中亚甲基蓝的光降解

本实验以煤系高岭土为主要原料制备超细分子筛,并负载过渡金属镍和钴,最终制成镍钴负载超细复合分子筛光催化剂,用于降解工业废水中的亚甲基蓝。实验中探讨了镍钴负载复合分子筛在不同的pH值、H2O2用量、光源等条件下对亚甲基蓝降解的影响。结果表明,在pH值为9的条件下,用光源为20 W紫外线消毒灯照射2h,亚甲基蓝溶液的吸光度明显下降,亚甲基蓝的降解率达到97%以上。     

插层膨润土负载掺铁TiO_2光催化剂的制备及其对亚甲基蓝的光降解

采用溶胶-凝胶法制备了具有高活性的可见光响应插层膨润土负载掺铁TiO2光催化剂(以下简称光催化剂),利用IR、XRD对光催化剂的组织构造和微观结构进行表征,并以亚甲基蓝为目标降解物,讨论了光催化剂在可见光下的催化活性。结果表明:掺铁TiO2成功负载于插层膨润土片层表面,当有机土和掺铁TiO2的配比为2∶1,烘干温度为80℃,焙烧温度为300℃,所制得光催化剂在可见光下,对pH值为4的亚甲基蓝废水溶液50min的降解率可达99.6%。     

掺杂型纳米TiO2光催化降解亚甲基蓝

印染废水的治理是水系环境治理的重点,而亚甲基蓝是印染废水中典型的有机污染物。本论文选用掺杂铁、钒、硅和锌等离子的纳米TiO2作为光催化剂对亚甲基蓝进行降解研究。焙烧温度与光催化剂掺杂量对样品光催化降解亚甲基蓝的活性具有很大影响,焙烧温度为500℃,Si4+掺入量为5%时光催化剂对亚甲基蓝的降解效果最好。     

ZnS/ZnO/rGO复合材料的制备及其光催化性能研究

以醋酸锌、硫化钠为原料,聚乙烯吡咯烷酮(PVP)为改性剂,采用一步合成法制备了β-ZnS,再通过焙烧制备ZnS/ZnO异质结材料,然后加入一定量氧化石墨烯(GO)利用水热法成功制备了ZnS/ZnO/rGO复合材料。结果表明,在水热时间16 h、水热温度140℃、GO∶(ZnS/ZnO)质量比20%的条件下,所制备的ZnS/ZnO/rGO复合材料在可见光光照120 min内对亚甲基蓝的降解率可达80.3%。     

ZnO/CdS纳米异质结构的合成及其光催化性能研究

利用乙酸锌和乌洛托品(六次甲基四胺)的水热反应,在ITO导电基底表面合成ZnO纳米棒阵列薄膜,然后在ZnO纳米棒表面负载CdS量子点,最终制得ZnO/CdS异质纳米棒阵列材料。产品纯度高,结晶度良好。通过光催化降解有机污染物罗丹明B(RhB)的实验,分析了ZnO/CdS异质结构的光电性质。结果表明,经CdS量子点修饰后,ZnO纳米棒阵列的光利用率显著提高,光催化活性也大大改善。     

海泡石/TiO_2的制备及光降解有机物性能研究

研究了以硫酸氧钛溶液为原料,以海泡石为载体,采用强迫回流水解法制备海泡石/TiO2(锐钛矿晶型)复合材料的方法。通过对甲基橙和亚甲基蓝溶液降解脱色实验,检验了样品的光催化性。结果表明,复合材料对亚甲基蓝溶液具有较强的吸附性和光降解性,经过6h光降解反应,脱色率达到99%以上。     

蒙脱石微囊的制备及其吸附性能研究

以有机改性蒙脱石为囊膜壁壳,采用皮克林乳液法制备蒙脱石微囊。利用光学显微镜、扫描电镜和红外光谱对所制蒙脱石微囊的形貌和结构进行了表征。通过蒙脱石微囊对亚甲基蓝和罗丹明B的吸附行为,探讨了其吸附性能。采用单因素法考察了微囊浓度、溶液p H值对染料分子吸附性能的影响。探讨了微囊对亚甲基蓝和罗丹明B混合染料的选择性吸附。结果表明:所制蒙脱石微囊经正硅酸乙酯交联后形貌保持较完整。微囊的红外特征吸收峰与蒙脱石特征吸收峰一致。不同微囊浓度和p H值条件下,蒙脱石微囊吸附亚甲基蓝和罗丹明B的过程符合一级动力学方程。微囊对亚甲基蓝和罗丹明B混合染料的吸附具有选择性,对亚甲基蓝的吸附速率高于罗丹明B。     

负载型TiO2/海泡石光催化氧化亚甲基蓝的效果

以亚甲基蓝的光催化降解为反应模型,对TiO2改性海泡石(海泡石/TiO2)的光催化性能及影响因素进行了探讨。实验结果表明:海泡石/TiO2经450℃处理后具有最大的光催化活性,其对亚甲基蓝的光降解率与等量的用同样方法合成的经550℃处理的TiO2纯样相当,并易于回收。亚甲基蓝的光降解率随着紫外光光强的增大而增大,海泡石未改变TiO2的吸收波段,即可见光对亚甲基蓝的光降解没贡献。     

Current situation and future trend of China rare earth luminescent material industry

<正>Rare earth luminescent material is one of the most important application sectors of rare earths.China enjoys the exceptional advantage to develop rare earth luminescent material for its abundant rare earth resources.After several decades'endeavor,China's rare earth luminescent material industry,headed by rare earth phosphor for lamp and LED and high efficient rare earth energy-saving light source,has been gradually developed into a scale industry.China has become a major production base of rare earth phosphor for lamps and rare earth     

China rare earth market review

正June 1~10,2014Rare earth market remained weak.Quoted price of rare earth products was similar to that in May.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,polishing powder and ceramic industries remained inactive.Demand from downstream industry was soft.Consumers purchased on their needs.Suppliers had strong intention to sell.Prices of rare earth products     

Annual Report analysis of Chinese rare earth-related listed companies in 2013

<正>Chinese rare earth-related listed companies have published their 2013 annual reports.It can be understood from their reports that production and operation activities of Chinese rare earth-related companies were still heavily affected by macro economy and industrial policies.They basically followed the steps of national economy.In 2013,world economy recovered slowly but the economy     

Market opportunities and challenges for rare earth polishing powder

正1.Status of rare earth polishing powder Rare earth polishing powder with high content of cerium oxide began to replace iron oxide for glass polishing and became one of the key materials in glass polishing process since 1940.Compared with traditional iron oxide,rare earth polishing powder has many advantages,such as fast polishing rate,high polishing quality and long service life.It can achieve good surface quality and improve operation conditions.For example,in lens polishing,the polishing work that cerium     

Baotou Research Institute of Rare Earths developed a new RE alloy preparation technology

正Pyrometallurgy Laboratory of Baotou Research Institute of Rare Earths had independently developed a new preparation technology of rare earth alloy for NdFeB.The alloy can remarkably enhance the coercivity of NdFeB magnet but also evidently reduce the production cost of the magnet.The new master alloy was prepared in the kA pilot-scale electrolytic cell by the independent technology.The rare earth master alloy can be used as the raw material for NdFeB.Compared     

矿用防爆轴流对旋主要通风机叶片ANSYS模态分析及应用

高效节能矿用防爆对旋主要通风机的叶片是主要通风机运行的关键部件,叶片在运行时不断受到气流的作用力,从而使叶片产生振动,当叶片振动的频率与叶片的固有频率接近时,容易产生共振从而导致叶片的断裂。一旦叶片断裂时,对主要通风机的安全运行产生致命的影响,从而导致矿山、化工等企业发生重大事故,将会产生不可估量的损失。基于有限元分析软件ANSYS,对高效节能矿用防爆轴流对旋主要通风机叶片进行模态分析及产生对应的六阶模态频率,对主要通风机叶片的运行频率、固有频率及产生的共振问题进行了原理分析,并且解决了叶片频率共振的问题,从而为主要通风机叶片结构设计提供理论依据,并对主要通风机叶片的安全运行提供保障。     

2013 NdFeB export analysis

<正>China totally exported nearly 24,000 tonsof NdFeB products during 201 3,including 18,825 tons of permanent magnet,valued USD 1.34 billion at an average price of 71.4 USD/kg;3,277 tons of NdFeB magnetic powder,valued USD 1 01 million at an average price of 30.9 USD/kg;1,334 tons of strip casting ribbon,with total export value of USD 74million at an average price of 55.3 USD/kg;and 586     

Market and recycling of NiMH battery

<正>Market status and future trend of NiMH battery1.Global market of small NiMH battery Global market size of small NiMH batteries declined year on year since 2011.The trend will continue to 2018,at the rate of 5%to 10%annually.Demand for small NiMH batteries will be stable gradually.Many electrical apparatuses are powered by the built-in lithium battery today,which is the main reason for the shrunk market of small NiMH batteries.But,for some products,small NiMH     

China rare earth market review

正September 1-10,2014 Affected by the National Day holiday,rare earth transaction was stagnant and the market showed a weak steady state.As there was no good news for downstream market,some products with flat demand would likely rally slightly for some time to     

唐口煤矿深部复杂开采工作面瓦斯分源涌出规律研究

研究工作面瓦斯涌出规律对工作面瓦斯治理有重要意义。为了得到唐口煤矿深部3号煤层复杂开采条件下工作面回采时期瓦斯涌出时空演化规律,选取6304工作面作为对象,采用实测方法研究6304工作面瓦斯涌出规律。结果表明:6304工作面瓦斯涌出量为6.534 m³/min,其中煤壁占34.27%,落煤占29.62%,采空区占36.11%;沿工作面倾向由低到高,瓦斯浓度整体为上升趋势,其中1—76号架工作面瓦斯浓度小于0.20%,76—102号架瓦斯浓度上升明显,最大为0.387%;上隅角的后部采空区是工作面的瓦斯主要涌出源,上隅角1号测点瓦斯浓度0.78%,上隅角周边3号、5号、7号、8号、9号测点瓦斯浓度平均为0.643%;周期来压时,上隅角瓦斯相对平时较高。研究为针对性的瓦斯分源监控与灾害防治提供基础。