基于胶束强化超滤的金属离子去除技术研究进展

胶束强化超滤技术(MEUF)作为一种新兴的含金属废水处理技术,有着较好的应用前景.通过总结前人的研究结果,综合讨论了影响金属离子截留效果的各个因素,为优化MEUF提出了一些建议.并就当前采用胶束强化超滤法处理金属离子技术的最新发展与表面活性剂的循环再利用作了简要的介绍.     

胶束强化超滤技术处理含低浓度Ni2+废水

以表面活性剂SDBS为吸附载体,研究了胶束强化超滤(MEUF)对低浓度放射性废水中的金属离子核素Ni2+的处理效果.研究表明,在表面活性剂浓度为1.0mol·L-1、溶液pH为9时,MEUF对Ni2+的截留率达到95%,表明了MEUF在低浓度放射性废水中良好的应用前景.     

胶团强化超滤去除水中硝酸盐氮的实验研究

以表面活性剂CTAC和CPC为吸附载体,研究了胶团强化超滤(MEUF)对低浓度硝酸盐氮的截留效果。研究结果表明,以CTAC为表面活性剂进行胶团强化超滤时其对硝酸盐氮的截留率较CPC为表面活性剂时要高。当静置时间为10 min、pH=7、CTAC投加量为1.5倍CMC时,对硝酸盐氮的截留率最高,为97.33%,表明MEUF在低浓度硝酸盐氮废水处理中具有良好的应用前景。     

胶团强化超滤与泡沫分离组合工艺深度处理含Cd2+废水

采用胶团强化超滤(MEUF)-泡沫分离(FF)组合工艺,对含镉重金属废水进行深度处理.探讨了两种技术联用对分离效果的影响.结果表明,表面活性剂SDS和金属Cd2 离子浓度对分离效果有很大的影响.MEUF-FF联用后,大大降低了表面活性剂SDS用量,节省了经济成本.相比于单一的MEUF,MEUF-FF联用后能降低出水中SDS浓度,显著提高Cd2 分离效率.经过组合工艺处理后,Cd2 出水的浓度小于0.1mg/L,满足国家污水综合排放标准(GB8978-1996).     

胶束强化超滤法处理废水中金属阳离子的实验分析

近年来，水处理工艺的革新日新月异，水处理设备也是种类繁多层出不穷。新工艺与新设备的出现直接影响着我们的生活。随着多种新技术的逐渐成熟及广泛应用，也让水处理这一古老的课题焕发出勃勃的生机。研究一种用超滤膜与表面活性剂相结合处理含微量金属离子废水的新技术．胶束强化超滤（MEUF）．探讨影响去除效果的各种因素，并指出了存在的问题，实验结果表明该技术具有较好的应用前景。     

处理含有机污染物废水的新万法--胶团强化超滤

胶团强化超滤是一种处理含有机污染物废水的新技术。该技术利用表面活性剂胶团对有机物的增溶作用,结合超滤工艺,进而达到去除有机污染物的目的。文章详细介绍了胶团强化超滤处理含有机污染物废水的原理、影响因素,分析了该技术目前存在的问题以及今后的发展方向。     

胶团强化超滤在处理重金属离子废水中的应用

本文介绍了一种具有表面活性荆双分子结构特性的新型重金属离子废水处理技术一胶团强化超滤（Micellar—enhanced Ultrafiltration，简称MEUF）。MEUF适用于单独或同时从废水中去除多价金属离子，具有工艺简单，易于工业化的特点。文章介绍了胶团强化超滤的原理、主要影响因素、存在的问题及解决方法，总结了近年来胶团强化超滤应用的最新研究成果，认为该技术具有良好的应用前景。     

胶团强化超滤技术及其在废水处理中的应用研究进展

介绍了胶团强化超滤技术（Micelleenhanced uhrafiltration，MEUF）的原理、膜的选择、主要影响因素和存在的问题及改进方向，着重阐述了胶团强化超滤在废水处理方面的应用及研究进展。     

胶团强化超滤技术在染料废水处理中的应用研究进展

胶团强化超滤技术(MEUF)的研究开发,使得采用投资、运行费用都相对较低的超滤膜分离工艺能高效去除废水中的低浓度染料分子和有机物从理论和技术上成为可能.综合分析了胶团强化超滤技术的原理,以及应用于染料废水处理的主要影响因素,同时指出了该技术应用中存在的问题.     

胶团强化超滤处理水中环境激素双酚A研究

采用聚巩超滤膜和再生纤维素超滤膜,以十六烷基氛化吡啶(CPC)为表面活性剂,进行了胶团强化超滤处理水中双酚A (BPA)的研究,考察了操作压力、不同材质和截留相对分子质量的超滤膜、CPC浓度、溶液pH、电解质、非离子表面活性剂烷基多糖苷(APG)复配等因素对工艺的影响.结果表明,截留相对分子质量(MWCO)为5x103的聚砜UF膜和阳离子表面活性剂CPC,MEUF处理水中的BPA,在操作压力为0.15 Mpa,CPC的浓度为5 mmol·L-1条件下,对BPA的截留率可达90%以上,BPA的截留率及渗透液中CPC浓度随pH的变化而变化,电解质的存在以及CPC与APG的复配可以提高BPA的截留率,降低透渗透液中CPC的浓度.     

乙苯,苯乙烯的生产及合成乙苯,苯乙烯催化剂的研究进展

苯乙烯是重要的石油化工原料。本文介绍了国内外苯乙烯生产的发展概况，合成乙苯，苯乙烯所用的催化剂种类，并就苯乙烯生产及催化剂的发展趋势提出了自己的观点。     

Synthesis and characterization of homopolymers and copolymers of various acrylates and acrylonitrile

Various homopolymers and copolymers of methyl acrylate, ethyl acrylate, butyl acrylate, and acrylonitrile in different feed ratios were synthesized. These were characterized by IR, ¹³C-NMR, DSC, DTA, and TGA. Spectroscopic characterization helped in differentiating copolymers of different mol ratios. Thermal analysis revealed different degradation patterns for homopolymers and copolymers. The temperature and energy changes associated with various phase transitions were dependent on the chemical composition of homo- and copolymers, as expected. © 1993 John Wiley & Sons, Inc.     

生物质气化及生物质与煤共气化技术的研发与应用

总结了生物质原料的特点及生物质单独气化的缺点;介绍了国内外生物质气化技术及生物质与煤共气化技术的研发与应用现状;分析了在此领域国内外的发展趋势与前景;概括了开展生物质与煤共气化技术研发的意义。     

Electronic structures and reactivities of monometallic and bimetallic clusters of Au and Cu

The variation of the Au 4f binding energy of Au clusters with the cluster size has been established by measuring the binding energies of clusters whose size distributions were independently determined by HREM and STM. The binding energy increases significantly when the cluster size is less than 2 nm. Au-Cu bimetallic clusters of the composition Cu₃Au have been deposited for the first time on carbon substrates. The shifts in the core level binding energies of the bimetallic clusters show the effect of alloying in the case of large clusters, but show effects of both alloying and cluster size in the case of the small clusters. The interaction of CO with Cu₃Au clusters is stronger than with a bulk Cu metal. The interaction of CO with small Cu clusters also seems to be stronger than with bulk Cu or with large Cu clusters.     

钾盐资源及钾肥供需情况分析及预测

阐述了国内外钾盐资源及钾肥生产现状,对国内外钾盐的供需形势进行了分析及预测,从资源、原材料、国际市场三方面提出了解决我国钾盐短缺的措施。     

Kinetics and Mechanism of Oxidation of Mono- and Polyacetals

Abstract

Kinetics and mechanisms of oxidation of 6 acetals by molecular oxygen and ozone in liquid phase have been studied. Reaction with molecular oxygen (70°C, 15–16 hr) leads to the formation monoethers of the corresponding glycols with 68–90% selectivity. Salts of metals and complexes with crown-ethers have increased the reaction rate significally. Ozone have reacted with acetals with formation similar products. The mechanisms of intermediate stages have been proposed.     

Comparison of the Adhesion and Cohesion of Triblock and Random Copolymers of Styrene and Butadiene

A substantially greater detachment energy is required to strip a polyethylene tereph-thalate (Mylar) film from a styrene-butadiene-styrene (SBS) triblock copolymer compared to that for peeling from a random styrene-butadiene (SBR) copolymer. This is true even though the intrinsic interaction between the Mylar and each elastomer is expected to be similar because of their virtually identical chemical composition. It is proposed that this difference in peel strength (between the SBS and SBR) is a consequence of the much higher dissipative capacity of the former elastomer. Another manifestation of this is the higher cohesive tear strength of the SBS compared to the SBR. Extents of energy dissipation within each elastomer during detachment of the Mylar adherend are consistent with the hypothesis that the average maximum stress experience before detachment is some similar fraction of each elastomer's tensile strength.     

Wetting properties of homopolymers and copolymers of pentafluorostyrene and methylacrylate and homopolymer blends

Polypentafluorostyrene (PPFS), polymethylacrylate (PMA), and poly(pentafluorostyrene-co-methylacrylate), poly(PFS-co-MA) were prepared and the wetting characteristics of polymer blends of PPFS and PMA were compared with that of poly(PFS-co-MA) via contact angle measurements. The critical surface tension of polypentafluorostyrene was found to be 22.6 dyne/cm, which is comparable to the value reported for polytrifluoroethylene (22 dyne/cm). The critical surface tension of poly(PFS-co-MA) is not linearly related to its composition. The polymer blends of PPFS and PMA exhibit significant surface enrichment of the fluoropolymer. The harmonic-mean method¹ was employed to determine surface tensions of these polymers and many known polymers. It is found that the method produces useful surface tension data provided the contact angle values are derived from testing liquids of dissimilar polarity.     

责任和责任心的涵义与结构

责任是人应主动承担的角色义务和对其因过失所造成后果应承担的责罚.有两层涵义:一是义务;二是后果.责任心是个体自觉做好分内事务和履行道德义务的心理倾向,是个性心理品质成分中自我特征维度上的重要内容.责任心具有两个方面的涵义:一是角色分内职责;二是角色道德义务.责任心是一种通过责任认知、责任个性和责任适应的动态形式表现出来的静态品质,责任心是责任心过程结构与责任心关系结构相互制约、相互影响的统一体.     

二甲基二烯丙基氯化铵和丙烯酰胺的合成及应用

用复合引发体系(过硫酸盐-偶氮类引发剂)和脂肪胺类氧化还原体系引发,在实验室获得了单体转化率≥98%,特性粘数高于13.6 dL/g的阳离子共聚物PDA,探讨了控制聚合物分子量的影响因素.