共查询到20条相似文献,搜索用时 62 毫秒
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《非金属矿》2021,(5)
采用溶胶-凝胶法制备TiO_2/MMT光催化复合材料,考察TiO_2负载量、焙烧温度和时间、p H值、苯酚溶液初始质量浓度、MMT添加量对光催化降解苯酚活性的影响。结果表明,TiO_2负载量为60%,焙烧温度为500℃,焙烧时间为4 h,制备的TiO_2/MMT对苯酚降解活性最佳,在p H值为6,溶液初始质量浓度为10 mg/L,光催化剂用量为2 g/L条件下,对苯酚溶液光催化降解150 min降解率为86.1%。采用傅里叶红外光谱仪、X射线衍射仪、扫描电镜对复合材料进行表征。结果表明,TiO_2与MMT复合后均为锐钛矿相,粒径减小,60%TiO_2/MMT复合材料对苯酚的光催化降解活性优于纯TiO_2,降解过程遵循准一级动力学方程。 相似文献
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电镀法制备多孔光催化材料及其性能研究 总被引:1,自引:0,他引:1
以多孔泡沫镍为载体,采用电镀法制备多孔光催化材料,并研究其对水中罗丹明B的降解性能.结果表明,多孔光催化材料对水中罗丹明B的光催化降解反应严格符合零级动力学规律.最佳制备工艺条件为:电镀液中硫酸镍浓度180g/L;镀液中P25型纳米TiO2粉体投加量2g/L;电镀温度45℃;搅拌速度4档.Bi2O3和ZnO复合改性使产品的光催化性能提高,复合粉体中的Bi2O3和ZnO起电子-空穴分离的桥梁作用.纳米Bi2O3复合量达7%或ZnO复合量为2%时,产品的光催化性能最优.Ag修饰使经Bi2O3或ZnO复合的光催化材料的光催化性能有所提高.经Bi2O3复合的光催化材料的最佳Ag修饰量为1%,经ZnO复合的光催化材料的最佳Ag修饰量为4%. 相似文献
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TiO_2/ATP纳米复合材料光催化降解甲基橙的动力学研究 总被引:1,自引:0,他引:1
以纳米凹凸棒土为栽体.TiCl4.为钛源,采用低温溶解-再沉淀法制备TiO2/ATP纳米复合材料,研究了在不同反应条件下复合材料光催化降解甲基橙的动力学过程.结果表明:当催化剂的用量为1.0g/L,甲基橙溶液初始浓度为0.01g/L、pH=3时,反应4h后甲基橙的降解串可达93.75%;复合材料对甲基橙的光催化降解反应可以用一级反应动力学方程进行描述. 相似文献
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采用自然延流法在载玻片基底上制备出纳米TiO2薄膜,以300W高压汞灯为光源,进行光催化降解苯酚溶液的研究.结果表明,制备的纳米TiO2薄膜对苯酚有稳定的光催化氧化降解性能,且TiO2薄膜具有很好的寿命,重复使用多次后,其光催化性能几乎不变.少量的H2O2与TiO2有很好的协同催化作用,使得苯酚光催化氧化速度极大加快,且苯酚降解率随着H2O2量的增加而不断上升.高效液相色谱(HPLC)测试结果表明,在光照4h时,降解苯酚溶液的产物为对苯二酚、邻苯二酚、顺丁烯二酸、草酸和甲酸等,光照6h时,降解产物基本转化为草酸和甲酸. 相似文献
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网固定TiO2薄膜的制备及光催化性能研究 总被引:1,自引:1,他引:0
采用TiO2胶体合成-不锈钢金属网表面浸渍提拉法镀TiO2胶体膜-焙烧工艺制备网固定TiO2薄膜光催化材料,并以偶氮染料废水为降解对象,研究了镀膜次数、焙烧温度以及偶氮染料初始浓度对材料光催化活性的影响。结果表明:镀膜5次后在700 ℃下焙烧2 h,可以得到光催化性能优异的金属网固定TiO2薄膜。用该制品对浓度为27 mg/L的偶氮染料废水光降解3 h,降解脱色率达到99.07%。TiO2晶体膜在金属网表面键合牢固,重复使用仍保持良好的光催化活性。 相似文献
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以钛酸丁酯为钛源、硝酸钇和二乙醇胺为改性剂原料,凹凸棒土为载体,采用溶胶-凝胶法制备了凹凸棒土负载的Y-N-TiO_2/凹凸棒土光催化剂,通过IR和XRD对其结构进行表征。考察了焙烧温度、催化剂用量、溶液pH值、光照条件等因素对光催化剂降解诺氟沙星性能的影响。结果表明,Y、N掺入了TiO_2晶格,其中部分TiO_2进入了催化剂载体凹凸棒土的层间并通过化学键与其成功复合。500℃焙烧的催化剂中锐钛矿型TiO_2比例相对较高,表现出最优的光催化活性,当催化剂用量为2g/L,溶液pH值为6,在可见光或太阳光下反应2h后,该催化剂对25mg/L的诺氟沙星降解率分别达89.6%和91.3%。此外,该催化剂易于回收,再生性良好。 相似文献
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中孔纳米二氧化钛光催化降解苯酚的研究 总被引:2,自引:0,他引:2
以溶胶-凝胶法合成中孔纳米二氧化钛,考察不同光降解反应条件下其对苯酚溶液的降解效果。结果表明,反应液pH在7~9。通氧速率为1g/L,光催化剂用量为0.3~0.4g/L时,光催化降解效果最好。制备的中孔二氧化钛由于其孔状结构使光催化效率明显高于P-25。 相似文献
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Bai Wenping 《中国稀土信息(英文版)》2014,(12)
<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 相似文献
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《中国稀土信息(英文版)》2014,(9)
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 相似文献
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《中国稀土信息(英文版)》2014,(10)
<正>Developing ecological lighting source The world is facing the big problem of energy shortage today and the contradiction between economy development and environmental protection is worsened.Therefore,people are more likely to choose an ecological light source that is more energy efficient and environmental friendly.The choice provides great opportunity for the development of rare earth optical material industry in China.The concept of green lighting positions rare earth luminescent material as a leading player in illumination market.The light source of both rare earth luminescent lamp and LED lamp is ecological and energy saving.This is why 相似文献
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《中国稀土信息(英文版)》2014,(8)
正Galaxy Magnet announced its financial results for the first half of 2014 on August 14.For the first six months ended on 30 June 2014,Galaxy Magnet achieved operation income of RMB 182.3 million,up8.40% over the same period of 2013,and the net profit attributable to the shareholders of the listed company of 34.02 million yuan,increasing 35.49% over the same period of last year.Stable performance increase was led by development of new customers and application market of magnets. 相似文献
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<正>China has rich rare earth resources.Output of rare earth and steel in China ranks the top first in the world.However,there is still certain distance between the steel produced in China and developed countries from the point of varieties and quality.China still has to import some types of steel.Improving the quality should be emphasiZed in future development of steel industry in China.Rare earth can be used to upgrade traditional steel 相似文献
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《中国稀土信息(英文版)》2014,(12)
正November 21~30,2014Due to weak demand from downstream industries,transactions of rare earth in Chinese domestic market were inactive.It was difficult to sell any rare earth products except for dysprosium oxide and terbium oxide.Suppliers lost confidence in recent market.Demand for rare earth products was soft.Consumers continued to take a wait-and-see attitude.Rare earth export market remained slow. 相似文献
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分析了近年来国内外稀散金属产业的生产、应用、资源与市场状况.铟锡氧化物靶材、砷化镓晶片、锗红外材料、铼高温合金和硒在电解锰及玻璃的应用等已成为稀散金属的主要应用领域.稀散金属的产量快速增长达到历史高位而导致了市场的失衡.以GaInP_2/GaAs/Ge,CIGS和CdTe为代表的非硅系太阳能电池是稀散金属的新兴应用领域,将给稀散金属带来日益增长的需求. 相似文献
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<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 相似文献
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《中国稀土信息(英文版)》2014,(6)
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 相似文献
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