活性炭吸附罗丹明B的研究

文章以活性炭为吸附剂,对罗丹明B溶液进行吸附。考察了活性炭加入量、pH值和温度对吸附的影响以及吸附动力学。结果表明,随着活性炭加入量的逐渐增加,吸附值逐渐减小;随着pH逐渐升高,吸附值呈下降趋势。吸附值随温度升高呈下降趋势,表明活性炭对罗丹明B溶液的吸附是一个放热过程。活性炭对罗丹明B的吸附较好的符合Langmuir吸附模型。     

剩余活性污泥制备活性炭吸附罗丹明B的研究

以城市污水处理厂的脱水污泥作为主要原材料,以氯化锌(Zn Cl2)溶液为活化剂,通过化学活化法制得活性炭,并将其用于吸附罗丹明B染料,考察了p H值、吸附时间、溶液初始浓度和温度对吸附效果的影响.结果表明,在45℃,p H=4,初始浓度25mg/L时,反应时间80min,吸附率可达95%以上,污泥活性炭对罗丹明B的饱和吸附量为26.62mg/g.以污水厂污泥为原料制备出的污泥活性炭对罗丹明B染料废水进行吸附是可行的.     

碳氟表面活性剂改性活性炭对罗丹明染料的吸附性能

以十六烷基三甲基溴化铵、十二烷基硫酸钠、曲拉通、阴离子碳氟表面活性剂FS-62和非离子碳氟表面活性剂FS-3100为改性剂对颗粒活性炭进行改性,并将改性活性炭用于模拟废水中罗丹明B染料的吸附脱色性能研究。考察了活性炭吸附过程中改性剂种类、改性活性炭用量、吸附时间、体系温度等因素对活性炭吸附性能的影响。正交实验结果表明,碳氟表面活性剂FS-62改性活性炭用量为0.3 g/L、吸附时间为40 min、体系温度为70℃条件下,改性活性炭对罗丹明染料的脱色率较高。利用扫描电子显微镜分析了活性炭改性前后的形貌特征,并初步探究了FS-62改性活性炭对罗丹明染料的脱色吸附反应动力学特性。     

山竹壳活性炭的制备与吸附性能研究

以山竹壳为原料,采用氢氧化钾活化法制备了不同碱炭比的活性炭,通过扫描电子显微镜(SEM)和比表面积(BET)等对活性炭进行了物理性质表征.最优活性炭的比表面积高达2 96153 m2/g.对其进行罗丹明B和铅离子的吸附实验,并进行Langmuir和Freundlich吸附模型拟合,结果表明,山竹壳活性炭对罗丹明B的吸附更符合Langmuir吸附等温模型,而铅离子的吸附符合2种吸附模型.另外,该活性炭对罗丹明B和铅离子的饱和吸附量分别达到1 22218 mg/g和10707 mg/g.     

TiO_2借自然光催化罗丹明B溶液降解脱色的研究

研究了以TiO2为光催化剂,在可见光照条件下模拟染料废水罗丹明B溶液的光催化脱色性能。实验结果表明:催化剂的投入量,罗丹明B的初始质量浓度,光照时间是影响罗丹明B溶液脱色率的重要因素;当TiO2催化剂用量为4.0 g/L,罗丹明B的初始质量浓度为10 mg/L,光照时间为2.5 h时,罗丹明B溶液的脱色率可达99.2%。     

罗丹明B在竹炭上的吸附研究

研究了竹炭的粒径与用量、罗丹明B溶液的pH值与初始浓度、吸附时间和温度等因素对去除率的影响.研究结果表明:竹炭对罗丹明B吸附随其用量的增加而增大;罗丹明B初始浓度增大,竹炭对其去除率减小;溶液的pH值为3.0～5.0时,吸附效果好;竹炭对罗丹明B的吸附可在3h达到平衡.最佳吸附温度为70℃,等温吸附服从Freundlich方程式.竹炭是较为理想的吸附罗丹明B的材料.     

氧化石墨烯和石墨烯对离子型染料不同吸附性能研究

采用改进的Hummers法制备了氧化石墨烯,将其采用水合肼还原获得石墨烯,以氧化石墨烯和石墨烯为吸附剂,分别采用透射电镜（TEM）,傅里叶变换红外光谱（FT-IR）,拉曼光谱（RS）和X射线衍射光谱（XPS）对阴阳离子的不同吸附性能进行了分析表征.结果表明：两吸附剂对罗丹明B的吸附能力较甲基橙强,最大吸附容量分别为551.2 mg/g和476.2 mg/g,各吸附体系中的吸附行为都符合Langmuir等温吸附模型和二级动力学反应特征.     

氧化石墨烯和石墨烯对离子型染料不同吸附性能研究

采用改进的Hummers法制备了氧化石墨烯,将其采用水合肼还原获得石墨烯,以氧化石墨烯和石墨烯为吸附剂,分别采用透射电镜(TEM),傅里叶变换红外光谱(FT-IR),拉曼光谱(RS)和X射线衍射光谱(XPS)对阴阳离子的不同吸附性能进行了分析表征.结果表明:两吸附剂对罗丹明B的吸附能力较甲基橙强,最大吸附容量分别为551.2 mg/g和476.2 mg/g,各吸附体系中的吸附行为都符合Langmuir等温吸附模型和二级动力学反应特征.     

CS-CNTs-SA复合材料的制备及其对水中罗丹明B的吸附

以壳聚糖(CS)、碳纳米管(CNTs)和海藻酸钠(SA)为主要原料,制备了环境友好型的复合吸附材料——CS-CNTs-SA,并采用SEM和FTIR技术对复合吸附材料进行表征。考察了pH值、吸附剂的用量、吸附动力学和吸附等温线等因素对其吸附废水中罗丹明B效果的影响,并对CS-CNTs-SA进行疲劳试验。实验结果表明:在室温、溶液p H为1.0、罗丹明B的初始浓度10×10-6mol/L、CS-CNTs-SA的投放量为12mg/m L、吸附时间24 h的条件下,CS-CNTs-SA吸附去除罗丹明B的效果达到最佳;Langmui和Freundlich吸附等温方程都能较好地描述CS-CNTs-SA对罗丹明B的吸附行为;CS-CNTs-SA可以多次吸附处理罗丹明B废水,且仍具有一定的吸附性能。
     

CS-CNTs-SA复合材料的制备及其对水中罗丹明B的吸附

以壳聚糖(CS)、碳纳米管(CNTs)和海藻酸钠(SA)为主要原料,制备了环境友好型的复合吸附材料——CS-CNTsSA,并采用SEM和FTIR技术对复合吸附材料进行表征。考察了pH值、吸附剂的用量、吸附动力学、吸附等温线等因素对其吸附废水中罗丹明B效果的影响,并对CS-CNTs-SA进行疲劳试验。实验结果表明:在室温、溶液pH值为1.0、罗丹明B的初始浓度为10×10-6 mol·L~(-1)、CS-CNTs-SA的投放量为12mg·mL~(-1)、吸附时间为24h的条件下,CS-CNTsSA吸附去除罗丹明B的效果达到最佳;Langmui和Freundlich吸附等温方程都能较好地描述CS-CNTs-SA对罗丹明B的吸附行为;CS-CNTs-SA可以多次吸附处理罗丹明B废水,且仍具有一定的吸附性能。     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with     

Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

An improved R-tree based on childnode''s probability

R-Tree is a good structure for spatial searching. But in this indexing structure,either the sequence of nodes in the same level or sequence of traveling these nodes when queries are made is random. Since the possibility that the object appears in different MBR which have the same parents node is different, if we make the subnode who has the most possibility be traveled first, the time cost will be decreased in most of the cases. In some case, the possibility of a point belong to a rectangle will shows direct proportion with the size of the rectangle. But this conclusion is based on an assumption that the objects are symmetrically distributing in the area and this assumption is not always coming into existence. Now we found a more direct parameter to scale the possibility and made a little change on the structure of R-tree, to increase the possibility of founding the satisfying answer in the front sub trees. We names this structure probability based arranged R-tree (PBAR-tree).     

Integrating GIS Web services based on mediating architecture

The geographic information service is enabled by the advancements in general Web service technology and the focused efforts of the OGC in defining XML-based Web GIS service. Based on these models, this paper addresses the issue of services chaining,the process of combining or pipelining results from several interoperable GIS Web Services to create a customized solution. This paper presents a mediated chaining architecture in which a specific service takes responsibility for performing the process that describes a service chain. We designed the Spatial Information Process Language (SIPL) for dynamic modeling and describing the service chain, also a prototype of the Spatial Information Process Execution Engine (SIPEE) is implemented for executing processes written in SIPL. Discussion of measures to improve the functionality and performance of such system will be included.     

Tracking data management using topology of moving object database system for moving object constrained trajectory in LBS application

Advances in wireless technologies and positioning technologies and spread of wireless devices, an interest in LBS (Location Based Service) is arising. To provide location based service, tracking data should have been stored in moving object database management system (called MODBMS) with proper policies and managed efficiently. So the methods which acquire the location information at regular time intervals then, store and manage have been studied. In this paper, we suggest tracking data management techniques using topology that is corresponding to the moving path of moving object. In our techniques, we update the MODBMS when moving object arrived at a street intersection or a curved road which is represented as the node in topology and predict the location at past and future with attribute of topology and linear function. In this technique, location data that are corresponding to the node in topology are stored, thus reduce the number of update and amount of data. Also in case predicting the location,because topology are used as well as existing location information, accuracy for prediction is increased than applying linear function or spline function.