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中空型分子印迹聚合物的制备及其对4-甲基二苯并噻吩的吸附性能研究 总被引:1,自引:0,他引:1
以SiO2为载体,4-乙烯基吡啶为功能单体,结合牺牲载体法合成了一种具有特异性识别4-甲基二苯并噻吩的中空型分子印迹聚合物。利用傅立叶变换红外光谱、氮气吸附实验、扫描电镜对形态结构进行了表征。通过在模拟油中的静态吸附试验,对印迹聚合物的吸附性能进行了研究。结果表明,在SiO2表面成功地合成了具有多孔结构的分子印迹层,经过牺牲载体法处理后得到的中空分子印迹聚合物具有更好的表面特性,提高了吸附性能。中空型分子印迹聚合物对4-甲基二苯并噻吩表现出良好的特异性识别性能,吸附动力学满足Langergren准二级动力学方程,等温线符合Freundlich等温线模型,吸附热力学研究表明吸附是自发的吸热过程,在328K下的吸附容量为18.31498mg/g,吸附平衡时间为3h。 相似文献
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以Poly(GMA-DVB)微球为载体,将4,4′-偶氮双(4-氰基戊酸)(ACPA)连接到微球表面,然后以茶碱为模板分子,α-甲基丙烯酸(MAA)为功能单体,乙二醇二甲基丙烯酸酯(EGDMA)为交联剂,通过4,4′-偶氮双(4-氰基戊酸)(ACPA)引发聚合,在Poly(GMA-DVB)微球表面上均匀地接枝分子印迹聚合物,制备茶碱表面分子印迹聚合物微球。借助红外、电镜、粒度等表征方法对微球的制备进行了评价和探讨,采用静态法研究微球对茶碱的结合性能与分子识别特性。研究表明,分子印迹微球的接枝率随着载体微球表面环氧基含量的增加以及溶剂用量的减少而增大;分子印迹微球对茶碱具有特异的识别选择性与优良的结合亲和性,相对于咖啡碱识别选择性系数为2.81~3.62,室温吸附3 h内可以达到吸附平衡。 相似文献
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分子印迹聚合物微球制备方法研究进展 总被引:2,自引:0,他引:2
分子印迹聚合物微球具有制备简单、使用方便、分子识别效率高且便于控制粒径大小和功能设计等优点,近年来成为分子印迹技术领域研究的热点之一。对分子印迹聚合物微球的制备方法:溶胀悬浮聚合法、沉淀聚合法、悬浮聚合法和表面聚合法及其最新研究进展作了较为详细的综述。 相似文献
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《化工新型材料》2017,(2)
以盐酸二甲双胍为模板分子、Fe_3O_4为磁核、α-甲基丙烯酸为功能单体、乙二醇二甲基丙烯酸酯为交联剂、偶氮二异丁腈为引发剂,采用表面印迹聚合法成功制备了对盐酸二甲双胍具有特异性识别功能的磁性分子印迹聚合微球。合成的磁性聚合物具有良好的磁响应,在外加磁场下可实现快速磁分离。红外光谱、X射线光电子能谱和扫描电镜结果证实聚合物为核壳结构,磁性粒子由硅烷偶联剂完全包覆,并在其表面形成了一层分子印记聚合物。静态吸附实验结果表明,制备的磁性分子印迹聚合物对模板分子盐酸二甲双胍具有良好的吸附能力,其饱和吸附量为83mmol/kg。以双胍类降糖成分盐酸丁二胍和盐酸苯乙双胍为竞争分子,磁性印迹聚合物对模板分子表现出良好的特异选择性。 相似文献
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以2,4,6-三硝基甲苯(TNT)为模板分子、氨丙基三乙氧基硅烷为功能单体、正硅酸乙酯为交联剂,采用溶胶凝胶法成功制备了对TNT具有特异选择识别功能的磁性分子印迹聚合物。合成制备的磁性分子印迹聚合物具有良好的磁响应性,在外加磁场下可实现快速分离。红外光谱(FT-IR)、X射线光电子能谱和扫描电镜结果证实聚合物为核壳结构,磁性粒子由硅烷偶联剂完全包覆,并在其表面形成了一层分子印记聚合物;静态吸附实验结果表明,制备的磁性分子印迹聚合物对模板分子TNT具有良好的吸附能力,其饱和吸附量为77mmol/kg;通过以3,4-二硝基甲苯(DNT),为结构相似物的吸附选择性实验,磁性印迹聚合物对模板分子表现出良好的特异选择性。 相似文献
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《功能材料》2018,(11)
RAFT试剂介入制备白藜芦醇分子印迹聚合物并用于实际样品中白藜芦醇的分离富集。以二苄基三硫代碳酸酯(DBTTC)为RAFT试剂,以白藜芦醇为印迹化合物,以丙烯酰胺作为功能单体,利用可逆加成-断裂链转移自由基聚合法(RAFT)制备了白藜芦醇分子印迹聚合物。利用扫描电镜、红外光谱和色谱法考察了单体与交联剂比例、引发剂用量、溶剂用量、反应时间和反应温度对印迹聚合物形态结构、印迹聚合物的识别能力及分离效率的影响。结果显示,利用RAFT聚合法制备的白藜芦醇分子印迹聚合物对模板分子的结合量Q达到1 283μg/g,并具有特异性识别作用。通过活性自由基聚合法合成的分子印迹聚合物具有更好的形态结构,对目标分子具有较高的吸附效率。 相似文献
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《International journal for numerical methods in engineering》2018,113(9):1488-1506
In this paper, we present a new method for inserting several triangulated surfaces into an existing tetrahedral mesh generated by the meccano method. The result is a conformal mesh where each inserted surface is approximated by a set of faces of the final tetrahedral mesh. First, the tetrahedral mesh is refined around the inserted surfaces to capture their geometric features. Second, each immersed surface is approximated by a set of faces from the tetrahedral mesh. Third, following a novel approach, the nodes of the approximated surfaces are mapped to the corresponding immersed surface. Fourth, we untangle and smooth the mesh by optimizing a regularized shape distortion measure for tetrahedral elements in which we move all the nodes of the mesh, restricting the movement of the edge and surface nodes along the corresponding entity they belong to. The refining process allows approximating the immersed surface for any initial meccano tetrahedral mesh. Moreover, the proposed projection method avoids computational expensive geometric projections. Finally, the applied simultaneous untangling and smoothing process delivers a high‐quality mesh and ensures that the immersed surfaces are interpolated. Several examples are presented to assess the properties of the proposed method. 相似文献
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Standards are the basis for production enterprises to organize production ex-factory inspection trade 《中国标准化(英文版)》2008,25(1):24-25
Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.…… 相似文献
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A flow calorimeter for enthalpy increment measurements on condensed gases is presented. A better knowledge of the properties of the liquefied natural gas is needed, and therefore a liquid loop has been designed for our flow calorimeter. The fluid loop in the calorimeter is designed in order to avoid the two-phase region, since two phases would give compositional disturbances in the measurements. The avoidance of the two-phase region is made possible by increasing the pressure of the test fluid after the measurement section, then heating the fluid at super-critical pressure past the critical point. Finally, the fluid is throttled to the low-pressure gas state at the inlet condition of the compressor that circulates the fluid. To perform the pressure increase, a new cryogenic pump has been designed. To evaluate the new equipment, measurements were taken on liquid ethane over the temperature range 146–256 K at pressure between 0.9 and 5.1 MPa. 相似文献
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On November 30, 2007, the China Association for Standardization (CAS) held a press conference at Beijing Diaoyutai State Guest House. Leaders from the China Household Electric Appliance Research Institute, the China Household Electric Appliance Association, and the China Consumers' Association attended and made speeches.…… 相似文献
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Zusammenfassung Bei der Gestaltung von Ernteprozessen — beispielsweise des Prozesses Mähdrusch, Körnertransport und -abnahme — als transportverbundene Fließarbeitsverfahren mit mindestens zwei verschiedenen Arbeitsmitteln gibt es einen großen Optimierungsspielraum. Solche Prozesse sind mehrstufige Bedienungsprozesse mit gemischter Anordnung der Bedienungseinrichtungen. Außerdem besitzen sie stark ausgeprägte räumliche Aspekte. Es wird vor allem gezeigt, welche Merkmale solcher Prozesse in Simulationsmodellen abgebildet sein müssen, welche Zielgrößen in Abhängigkeit von welchen Einflußgrößen unter Berücksichtigung welcher Prozeßbedingungen ermittelt werden sollten und wie der Bewertungsprozeß zur Ermittlung der gewünschten Informationen gestaltet werden muß. 相似文献
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C. Qihong W. Zhan‐Wen J. Yi J. Yehua L. Fei F. Hanguang 《Materialwissenschaft und Werkstofftechnik》2014,45(7):582-590
In the present study a high‐boron high speed steel (HSS) roll material was designed. Many expensive alloy elements have been substituted by cheap boron alloy, and high‐boron high speed steel roll has been manufactured by centrifugal casting method. The microstructures, mechanical properties and wear resistance of centrifugal casting high‐boron high speed steel roll have been investigated by optical microscopy (OM), scanning electron microscopy (SEM), and X‐ray diffraction (XRD) analysis, hardness test, impact test and wear test. The results indicated that the solidification microstructures of high‐boron high speed steel roll consisted of M2(B,C), (W,Mo)2(B,C), M3(B,C), M23(B,C)6 type borocarbides and martensite, a small amount of retained austenite. Borocarbides were continuously distributed over the grain boundary. After quenching from 1050 °C, local broken network appeared in partial borocarbides, and fine secondary borocarbide precipitated from the matrix. After tempering from 525 °C, the amount of precipitated borocarbide increased significantly. After heat treatment, the hardness of high‐boron high speed steel roll excelled 60 HRC, and its impact toughness excelled 8.0 J/cm2. The single groove steel rolling amount of high‐boron high speed steel rolls increases by 500% than that of bainite cast iron roll, when the rolls are used in K1 mill housing of bar mill. 相似文献
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Dimiter Hadjistamov 《材料科学与工程:中英文B版...》2019,(2):56-65
The definition of the thixotropy is a decrease in viscosity with time in shear and a subsequent recovery of viscosity after the shear deformation is removed.We ... 相似文献
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《中国标准化(英文版)》2014,(4)
正Responding to ISO’s appeal for survey for the to-be-developed ISO Strategy Plan for 2016-2020,SAC hosted a special workshop over the needs and comments of various fi elds on June 8 in Beijing.The workshop was attended by ISO President-elect and Ansteel General Manager Zhang Xiaogang,SAC Vice-Administrator Yu Xinli,and 30 experts from 相似文献
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《中国标准化(英文版)》2014,(5)
正The review group of Asia Pacific Laboratory Accreditation Cooperation(APLAC)carried out a 4-day peer review of the proficiency testing provider(PTP)for China National Accreditation Service for Conformity Assessment(CNAS)from July 28 to 31,2014.CNAS passed the PTP review with excellent performance.Two senior peer reviewers of APLAC made a comprehensive,rigorous and detailed review of CNAS’s PTP accreditation activities,and made the on-spot inspection of the review groups in Shanghai and Shenzhen respectively. 相似文献