纳米TiO2光催化降解亚甲基蓝

在以钛酸丁酯为钛源,采用溶胶-凝胶法合成制备纳米TiO2催化剂样品的基础上,将其用于在紫外光照射和无光照射条件下进行亚甲基蓝降解的实验研究,并与P-25纳米TiO2进行光催化降解对比研究。对在不同条件下合成制备样品的光催化降解率的差异,通过X射线粉晶衍射、扫描电镜等从物相组成、微观结构等因素上进行了分析和探讨。结果表明,采用溶胶-凝胶法在450℃焙烧2 h所得到的纳米TiO2具有很好的光催化降解亚甲基蓝的能力,当催化剂样品质量浓度为2.5 g/L,亚甲基蓝初始浓度为5.0 mg/L时,室温下光催化反应3 h,其降解率达98%以上,其光催化降解率比P-25纳米TiO2高;光催化降解率与催化剂样品的制备条件、物相组成、颗粒尺寸等因素有关。     

天然沸石负载二氧化钛光催化剂的制备与性能研究

以钛酸丁酯为钛源，天然沸石为载体，用溶胶．凝胶法制备了天然沸石负载TiO2光催化剂，用紫外可见吸收光谱、比表面积、红外光谱和X射线衍射等分析技术对沸石负载TiO2光催化剂进行了表征，以甲基橙为目标降解染料，考察了TiO2负载量、催化剂用量、热处理温度等不同条件下催化剂的光催化活性，结果表明，用天然沸石为载体所制得的TiO2光催化剂对于甲基橙具有较好的光催化降解效果。     

蒙脱石基纳米FeOOH/TiO2复合材料的制备与光催化活性研究

以蒙脱石为基底,采用溶胶-凝胶法制备二氧化钛/蒙脱石(TiO2/Mmt)复合光催化材料,通过Fe(NO3)3-HNO3体系水解生长纳米FeOOH,从而制备出负载型羟基氧化铁/二氧化钛/蒙脱石(FeOOH/TiO3/Mmt)复合光催化材料以改善材料在可见光下的光催化性能.高分辨透射电镜的表征结果显示,FeOOH/TiO2复合薄膜厚度约为10～40 nm,TiO2为晶粒粒径约为5～10nm的锐钛矿,FeOOH为长10～30 nm,宽约4 nm的针铁矿.以甲基橙为目标物,对FeOOH/TiO2/Mmt复合材料的光催化性能进行初探,在甲基橙初始浓度为5 mg/L,催化剂用量为1.875 g/L,H2O2初始浓度为2 mmol/L,pH值为6.5,350 W氙灯照射1 h,甲基橙脱色率达到99%,明显优于相同条件下TiO2/Mint对甲基橙的45%脱色率;同时甲基橙残液的红外光谱图显示FeOOH/TiO2/Mmt/H2O2/UV体系比FeOOH/TiO2/Mint/H2O2/Visible light体系具备更好的光催化氧化苯环的能力,降解更为彻底.     

掺铁-TiO2/膨润土复合光催化材料制备及性能

采用酸性溶胶法制备掺铁-TiO₂/膨润土复合光催化剂,利用XRD﹑IR等测试手段对其进行了表征。通过测试甲基橙溶液的脱色率和COD去除率对复合光催化剂的光催化活性进行了评价。结果表明,该催化剂有较高的催化氧化性能,在太阳光照射下,对pH=4﹑质量浓度为20 mg/L的甲基橙溶液进行降解时,其脱色率可达95%以上,COD去除率可达85%以上。该催化剂在经过200℃焙烧活化2.5 h后可多次重复利用。     

微晶白云母负载纳米TiO2及其光催化性能研究

以微晶白云母为载体,钛酸丁酯为钛源,采用溶胶-凝胶法合成制备微晶白云母负载纳米TiO2光催化剂,然后用X射线衍射,扫描电镜等对微晶白云母负载TiO2光催化剂进行表征。再以微晶白云母负载纳米TiO2光催化剂对亚甲基蓝进行了光催化降解研究,特别针对有无紫外光照射条件下微晶白云母、纳米TiO2、微晶白云母/纳米TiO2等在亚甲基蓝溶液中的行为进行研究,结果表明:所制备的微晶白云母负载TiO2光催化剂对亚甲基蓝具有较好的光催化降解能力,1250目微晶白云母负载TiO2在紫外光照射下光催化反应4h,其降解率可达99%以上。     

硅烷偶联剂改性TiO2/膨胀石墨复合材料的制备及其光催化性能研究

以硅烷偶联剂黏结剂,利用溶胶-凝胶法将TiO2（P25）负载在膨胀石墨上,利用XRD、EDS以及SEM等分析技术对TiO2/膨胀石墨复合材料进行表征;以橙黄Ⅱ为目标降解物,考察了TiO2/膨胀石墨复合材料光催化性能以及重复使用性能。结果表明：随着TiO2含量的增加,TiO2/膨胀石墨复合材料的光催化效率随之增加,对橙黄Ⅱ的光催化降解符合一级反应动力学方程,TiO2负载量为15%时,反应速率常数为0.387 h-1,高于P25的反应速率常数。TiO2/膨胀石墨复合物使用4次仍保持较高的光催化活性。     

掺铁二氧化钛薄膜的自组装制备、表征与光催化性能研究

采用自组装方法于低温液相反应体系中成功制备出大尺寸二维纳米二氧化钛薄膜和掺铁二氧化钛薄膜。样品通过荧光发射光谱、拉曼光谱、高分辨透射电镜等方法进行表征,并研究了紫外光和可见光下Fe3+/TiO2纳米薄膜对甲基橙溶液(MO)的光催化降解过程,探讨了Fe3+对TiO2的光催化活性的影响。结果表明,此方法不需要高温煅烧即可得到高催化活性的金红石和锐钛矿混合型二氧化钛薄膜,以金红石为主。Fe3+掺杂明显提高了TiO2对甲基橙溶液的光催化降解效率:掺杂Fe3+浓度为0.5 mmol/L时光催化效果最优,且更利于较低浓度甲基橙溶液的降解,在紫外光和可见光下对初始浓度5 mg/L甲基橙溶液的降解率分别达到98.62%和89.24%。     

TiO_2-I~-/γFe_2O_3磁性复合催化剂的制备及性能

以四氧化三铁、钛酸四丁酯和氢碘酸等为原料,采用溶胶-凝胶法制备了一种新型磁性复合催化剂TiO_2-I~-/γFe_2O_3.通过X射线衍射分析、热重差热分析、透射电镜以及红外光谱进行分析,研究了热处理时间、温度以及碘掺杂量对光催化剂性能的影响.结果表踢:最佳碘掺杂量为0.5%,烧结温度为400℃,最佳烧结时间为0.5 h,材料对甲基橙的降解率达99%,3次循环使用后甲基橙的降解率仍保持在80%.     

TiO2/电气石复合物的光催化性能

采用溶胶-凝胶法制备TiO2/电气石复合光催化剂,通过光降解甲基橙实验考察复合光催化剂的活性,发现复合物中2%电气石的制备比例就可以显著提升TiO2降解有机物活性,降解率(0.5h)达99.87%,明显优于纯TiO2(0.5h)83.64%,提高了约20%。经XRD、BET、SEM等手段对样品进行分析得知:经800℃以下长时间热处理,电气石的结晶构造不变;900℃热处理使电气石结构破坏。SEM分析显示复合物中TiO2颗粒呈球簇状,均匀包覆在电气石表面形成颗粒膜层。     

坡缕石/磁性铁氧化物/TiO2复合光催化剂性能实验研究

用醇盐水解法、硫酸亚铁-硝酸钾氧化法制备TiO2光催化剂、坡缕石/TiO2复合光催化剂和坡缕石/磁性铁氧化物/TiO2复合光催化剂.通过XRD、TEM、UV-Vis和MS分析光催化剂的物相组成、形貌特征、对紫外可见光的漫反射以及磁化率,并以甲基橙为处理对象,对比研究了TiO2光催化剂、坡缕石/TiO2复合光催化剂和坡缕石/磁性铁氧化物/TiO2复合光催化剂的光催化效果.结果表明:坡缕石/磁性铁氧化物的复合能降低复合光催化剂中锐钛矿的平均粒径,提高锐钛矿的分散性.铁的复合是否提高光催化剂的光催化效率与催化剂的煅烧温度有关.坡缕石的复合对光催化剂的最佳煅烧温度有影响.     

Définition d'une limite multicritère ; stratigraphie du passage Campanien–Maastrichtien du site géologique de Tercis (Landes,SW France)Definition of a multi-criteria boundary; stratigraphy of the Campanian–Maastrichtian interval of the geological site at Tercis (Landes,SW France)

Lithostratigraphy, physicochemical stratigraphy, biostratigraphy, and geochronology of the 77–70 Ma old series bracketing the Campanian–Maastrichtian boundary have been investigated by 70 experts. For the first time, direct relationships between macro- and microfossils have been established, as well as direct and indirect relationships between chemo-physical and biostratigraphical tools. A combination of criteria for selecting the boundary level, duration estimates, uncertainties on durations and on the location of biohorizons have been considered; new chronostratigraphic units are proposed. The geological site at Tercis is accepted by the Commission on Stratigraphy as the international reference for the stratigraphy of the studied interval. To cite this article: G.S. Odin, C. R. Geoscience 334 (2002) 409–414.     

Late Wuchiapingian (Late Dzhulfian,early Late Permian) limestone olistolites within the Tertiary flysch of Glypia Unit (Mount Parnon,central–eastern Peloponnesus,Greece)

Some olistolites reworked in a Tertiary flysch of Mount Parnon (Peloponnesus, Greece) exhibit a Late Permian assemblage, dominated by Paradunbarula (Shindella) shindensis, Hemigordiopsis cf. luquensis and Colaniella aff. minima. This association corresponds to the Late Wuchiapingian (=Late Dzhulfian), a substage whose algae and foraminifera are generally little known. Contemporaneous limestones crop out in the middle part of the Episkopi Formation in Hydra, but they are rather commonly reworked in Mesozoic and Cainozoic sequences. The palaeobiogeographical affinities shared by the foraminiferal markers of Greece, southeastern Pamir, and southern China, are very strong (up to the specific level), and are congruent with the Pangea B reconstructions. To cite this article: E. Skourtsos et al., C. R. Geoscience 334 (2002) 925–931.     

PALEONTOLOGY

正20141596 Liu Yunhuan(School of Earth Sciences and Resources,Chang’an University,Xi’an 710054,China);Shao Tiequan Early Cambrian Quadrapyrgites Fossils of Xixiang Boita in Southern Shaanxi Province(Journal of Earth Sciences and Environment,ISSN1672-6561,CN61-1423/P,35(3),2013,p.39-43,3 illus.,20 refs.)     

GEOCHEMICAL EXPLORATION

正20141719 Chen Zhijun(State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Wuhan 430074,China);Chen Jianguo Automated Batch Mapping Solution for Serial Maps:A Case Study of Exploration Geochemistry Maps(Journal of Geology,ISSN1674-3636,CN32-1796/P,37(3),2013,p.456-464,2 illus.,2 tables,10 refs.)     

MICROPALAEONTOLOGY

正20140962 Chen Fenning(Xi’an Institute of Geology and Mineral Resources,Xi’an710054,China);Chen Ruiming Late Miocene-Early Pleistocene Ostracoda Fauna of Gyirong Basin,Southern Tibet(Acta Geologica Sinica,ISSN0001-5717,CN11-1951/P,87(6),2013,p.872-886,6illus.,56refs.)     

PETROLOGY

正1.IGNEOUS PETROLOGY20142008Cai Jinhui(Wuhan Center,China Geological Survey,Wuhan 430205,China);Liu Wei Zircon U-Pb Geochronology and Mineralization Significance of Granodiorites from Fuzichong Pb-Zn Deposit,Guangxi,South China(Geology and Mineral Resources of South China,ISSN1007-3701,CN42-1417/P,29(4),2013,p.271-281,7illus.,     

ENVIRONMENTAL GEOLOGY

正20141205Cheng Weiming(State Key Laboratory of Resources and Environmental Information System,Institute of Geographic Sciences and Natural Resources Research,CAS,Beijing 100101,China);Xia Yao Regional Hazard Assessment of Disaster Environment for Debris Flows:Taking Jundu Mountain,Beijing as an     

PROSPECTING EXPLORATION

正20141266Fan Chaoyan(Guangdong Provincial Key Laboratory of Mineral Resources and Geological Processes,Guangzhou 510275,China);Wang Zhenghai On Error Analysis and Correction Method of Measured Strata Section with Wire Projection Method(Journal of     

OCEANOGRAPHY & MARINE GEOLOGY

正20140582 Fang Xisheng(Key Lab.of Marine Sedimentology and Environmental Geology,First Institute of Oceanography,State Oceanic Administration,Qingdao 266061,China);Shi Xuefa Mineralogy of Surface Sediment in the Eastern Area off the Ryukyu Islands and Its Geological Significance(Marine Geology Quaternary Geology,ISSN0256-1492,CN37     

ENVIRONMENTAL GEOLOGY

正20141810 Bian Yumei(Geological Environmental Monitoring Center of Liaoning Province,Shenyang 110032,China);Zhang Jing Zoning Haicheng,Liaoning Province,by GeoHazard Risk and Geo-Hazard Assessment(Journal of Geological Hazards and Environment Preservation,ISSN1006-4362,CN51-1467/P,24(3),2013,p.5-9,2 illus.,tables,refs.)