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简易模板法制备有序介孔碳 总被引:1,自引:0,他引:1
通过一种简易的模板法制备了有序介孔碳,即硅/P123三嵌段共聚物复合物经硫酸处理后,再加入蔗糖碳源经碳化和除硅处理合成出有序介孔碳。该方法与传统硬模板相比,其合成工序简单,成本更低;与其他简化合成方法相比,避免了由碳源不足而造成的介孔碳有序性低的缺点。通过小角XRD、N2吸脱附和HRTEM对样品及其中间过程进行了表征。结果表明,自晶化过程后,样品在合成的各个时期均保持着有序的介孔结构,当蔗糖添加量为1.5g时合成出的介孔碳材料有序性最高,比表面积和孔容也最高,分别为1261m2·g-1,1.03cm3·g-1。 相似文献
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模板法制备介孔材料的研究进展 总被引:21,自引:0,他引:21
从微孔到中孔或介孔材料的制备过程中.离子模板、乳液模板、液晶模板及至细菌模板得到广泛的应用.具有空间规整性的介孔材料就其介观结构所具有的空间群而言,有P6mm,P6 3/mmc,Pm3n,Ia3d;就其介观结构的形态而言.有二维六方,三维六方,双连续立方,La层状相,多层囊泡等.本文对MCM系列,SBA-n系列、MSU系列,以及那些较为单一的硅基品种FMS-16、HMS等的制备体系及其特点进行了综述.对介孔分子筛合成中常用的表面活性剂分子类型进行了归纳.本文针对的是单一表面活性剂作模板的类型,对那些混合型模板则未予详细介绍. 相似文献
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用六水合硝酸镍为镍源,尿素为沉淀剂,以少量的复合表面活性剂(SDS/P123,CTAB/P123,CTBA/SDS)为模板水热制备了介孔氧化镍。分别采用热重-差示扫描量热(TG-DSC)、傅立叶红外光谱(FTIR)、X射线衍射(XRD)、氮气吸附脱附、扫描电子显微镜(SEM)、透射电子显微镜(TEM)对产物的结构和形貌进行了表征。用循环伏安法,恒电流充放电和交流阻抗谱等对材料进行了电化学性能的测试。结果表明,以复合表面活性剂SDS/P123为模板制备的介孔氧化镍有最大的比表面积、孔径和比电容,且当SDS/P123质量比为2:1时,所制备的氧化镍比表面积、孔径和比电容分别为209 m2.g-1,0.407 cm3.g-1,265 F.g-1。 相似文献
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胶体晶体模板法制备三维有序大孔复合氧化物* 总被引:1,自引:0,他引:1
胶体晶体模板法是制备三维有序大孔(3DOM)复合氧化物材料的有效方法。制备过程一般包括3个步骤:首先,将单分散微球堆积成三维有序排列的胶体晶体;其次,将液态前驱体填充到胶体晶体的间隙,并在原位转化为固体骨架;最后,将微球去除,在原来微球间的空隙位置得到固体骨架,原来微球占据的位置则成为相互连接的孔穴。其中,胶体晶体模板的组装、前驱体的填充以及模板的去除都是制备3DOM复合氧化物的关键影响因素。本文针对这几个控制因素对胶体晶体模板法制备3DOM复合氧化物的影响进行了概述,并对孔结构的表征以及材料在催化和电极材料等方面的应用作了简单介绍。 相似文献
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胶粒晶体模板法制备三维有序大孔材料 总被引:2,自引:0,他引:2
使用胶粒模板法制备三维有序大孔材料(three-dimensional ordered macroporous material,3DOM)是一个快速发展的领域。本文综述了3DOM的合成技术,包括各种填充模板的方法、模板的去除方法以及它们在光子晶体、催化材料、生物传感器以及医学等方面的应用前景。 相似文献
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LIU Yu LIU Gang XU Yue ZHANG Wen-xiang WU Shu-jie JIA Ming-jun . Key Laboratory of Surface Interface Chemistry of Jilin Province College of Chemistry . Measurement Testing Center Jilin University Changchun P. R. China 《高等学校化学研究》2009,25(3)
Mesoporous carbon monolith was synthesized by the direct carbonization of compressed sucrose/silica composite,which was prepared by using sol-gel method. The structural and textural properties of the materials were investigated by XRD,DRIFT,N2-adsorption and SEM. The characterization study shows that the resultant carbon monolith possesses a relatively high surface area,large pore volume and well interconnected pore system. Addition of a certain amount of citric acid or aluminum nitrate into the sol-gel pre... 相似文献
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以聚甲基丙烯酸甲酯(PMMA)胶晶为大孔模板、嵌段共聚物P123为介孔模板,利用双模板剂法进行了三维有序大孔-介孔二氧化硅材料的制备研究。采用SEM、TEM、低角XRD以及N2吸脱附技术对样品进行了表征。结果表明,通过简单的调控PMMA胶晶模板的组装过程,就可以调变合成材料中的大孔结构,从而轻松地实现可控的制备出具有网状或者层状结构的三维有序大孔-介孔二氧化硅材料,并提出了其可能的形成机理。此外,所制备的三维有序大孔-介孔二氧化硅样品均具有较大的BET比表面积(>550m2·g-1),大孔孔径200nm左右,介孔孔径分布集中于3.5nm左右。 相似文献
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采用溶胶-凝胶法结合超分子模板技术, 以四乙氧基硅烷(TEOS)和3-氨丙基三乙氧基硅烷(APTES)作为反应前体, 以十六烷基三甲基溴化铵(CTMAB)为超分子模板, 简单快速地制备了一种新型氨基硅胶整体柱, 通过氨基将金纳米粒子组装在整体柱材料孔表面并用于表面增强拉曼散射(SERS)光谱分析. 以对巯基苯胺(PATP)和结晶紫(CV)为拉曼探针, 考察了金纳米粒子修饰的氨基硅胶整体柱用作SERS活性基底的性能. 结果表明, 该整体柱基底具有良好的SERS增强效应, 可检测到的PATP和CV的最低浓度分别为10-9和10-11 mol/L. 与金溶胶SERS基底相比, 本文制备的整体柱基底的检测灵敏度显著提高, 并具有良好的信号均一性, 是一种具有现场痕量检测应用潜力的SERS活性基底. 相似文献
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Ashraf Ali Sarah Alharthi Bashir Ahmad Alia Naz Idrees Khan Fazal Mabood 《Molecules (Basel, Switzerland)》2021,26(22)
The adsorptive removal of lead (II) from aqueous medium was carried out by chemically modified silica monolith particles. Porous silica monolith particles were prepared by the sol-gel method and their surface modification was carried out using trimethoxy silyl propyl urea (TSPU) to prepare inorganic–organic hybrid adsorbent. The resultant adsorbent was evaluated for the removal of lead (Pb) from aqueous medium. The effect of pH, adsorbent dose, metal ion concentration and adsorption time was determined. It was found that the optimum conditions for adsorption of lead (Pb) were pH 5, adsorbent dose of 0.4 g/L, Pb(II) ions concentration of 500 mg/L and adsorption time of 1 h. The adsorbent chemically modified SM was characterized by scanning electron microscopy (SEM), BET/BJH and thermo gravimetric analysis (TGA). The percent adsorption of Pb(II) onto chemically modified silica monolith particles was 98%. An isotherm study showed that the adsorption data of Pb(II) onto chemically modified SM was fully fitted with the Freundlich and Langmuir isotherm models. It was found from kinetic study that the adsorption of Pb(II) followed a pseudo second-order model. Moreover, thermodynamic study suggests that the adsorption of Pb(II) is spontaneous and exothermic. The adsorption capacity of chemically modified SM for Pb(II) ions was 792 mg/g which is quite high as compared to the traditional adsorbents. The adsorbent chemically modified SM was regenerated, used again three times for the adsorption of Pb(II) ions and it was found that the adsorption capacity of the regenerated adsorbent was only dropped by 7%. Due to high adsorption capacity chemically modified silica monolith particles could be used as an effective adsorbent for the removal of heavy metals from wastewater. 相似文献
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Unique Separation Behavior of a C60 Fullerene‐Bonded Silica Monolith Prepared by an Effective Thermal Coupling Agent 下载免费PDF全文
Dr. Takuya Kubo Yoshiki Murakami Madoka Tsuzuki Hiroshi Kobayashi Dr. Toyohiro Naito Dr. Tomoharu Sano Prof. Dr. Mingdi Yan Prof. Dr. Koji Otsuka 《Chemistry (Weinheim an der Bergstrasse, Germany)》2015,21(50):18095-18098
Herein, we report a newly developed C60 fullerene‐bonded silica monolith in a capillary with unique retention behavior due to the structure of C60 fullerene. N‐Hydroxysuccinimide (NHS)‐conjugated C60 fullerene was successfully synthesized by a thermal coupling agent, perfluorophenyl azide (PFPA), and assigned by spectroscopic analyses. Then, NHS‐PFPA‐C60 fullerene was attached onto the surface of a silica monolith in a capillary. The capillary provided specific separation ability for polycyclic aromatic hydrocarbons in liquid chromatography by an effective π–π interaction. Furthermore, corannulene, which has a hemispherical structure, was selectively retained in the capillary based on the specific structural recognition due to the spherical C60 fullerene. This is the first report revealing the spherical recognition ability by C60 fullerene in liquid chromatographic separation. 相似文献
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以水玻璃为硅源、Al2(SO4)3·18H2O为铝源,投料硅铝比SAR=n(SiO2)/n(Al2O3)=40,前躯体凝胶pH=11.2、Na2O/SiO2=0.18、 H2O/SiO2=43、m(晶种)/m(SiO2)=0.16,不添加任何模板剂条件下合成了具有多级孔结构的超低硅铝比ZSM 5分子筛,其结构经27Al NMR, SEM-EDS, Py-IR, NH3-TPD, XRD和N2-吸脱附表征。SEM结果表明ZSM-5分子筛晶体为侧面呈“维管束”状的长方体;EDS分析表明其表面硅铝分布具有显著不均一性:顶底表面SAR=20,侧面SAR=13。NH3-TPD分析表明:该ZSM-5分子筛整体具备可观的弱酸总酸量(1.9 mmol·g-1),且以Lewis酸为主。N2吸脱附实验表明:ZSM-5分子筛存在明显的介孔结构,属同时含有微孔-介孔结构的多级孔、超低硅铝比ZSM-5分子筛。 相似文献
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混合表面活性剂模板法合成立方相介孔含钛氧化硅 总被引:12,自引:0,他引:12
自1992年Mobil公司的M41S系列介孔氧化硅分子筛问世以来[1,2],借助表面活性剂液晶模板方法合成各种孔结构与不同大小孔径的硅基分子筛材料引起了人们的极大兴趣,目前多数工作仍然集中于六方相的介孔分子筛.具有双连续的三维交织立方排列孔道结构的MCM48由于其孔道不易堵塞和良好的骨架结构稳定性[3,4],在催化、吸附和与其为载体的制备等方面具有独特的应用价值.但由于液晶模板形成立方相区的范围非常狭窄,相应的分子堆积比对模板剂分子几何结构要求较苛刻,采用单一表面活性剂为模板剂合成时,条件难以掌握,制备MCM48十分困难.H… 相似文献
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Xiao Sha Xiaoli Sheng Yuming Zhou Beibei Wang Zhiying Zhu Qiang Liao Yonghui Liu 《应用有机金属化学》2020,34(4):e5460
Meso-macroporous poly (ionic liquids) (MPILs) were successfully synthesized through a novel strategy with P123 (PEO20PPO70PEO20) as the pore-forming agent and divinylbenzene as crosslinker. Then effects of reaction temperature and the molar ratio of ionic liquid to divinylbenzene (IL to DVB) were systematically investigated together with the morphology and structure of MPILs. It was found the MPILs owned a meso-macroporous channel-like structure, large surface area (up to 732 m2/g), large pore volume (1.42 cm3/g) and high thermal stability. Meanwhile, the Brunauer–Emmett–Teller surface of MPILs could be fabricated by adjusting the reaction temperature and especially the IL to DVB molar ratio. In the probe reaction of alkylation of styrene and o-xylene, a 100% conversion of styrene and 96.4% PXE yield was acquired, and this is more expert than common commercial liquid acid catalyst. This work might develop a novel way for synthesizing porous heterogeneous polymer catalysts in the future and owning a promising future applied in other acidic catalytic reactions. 相似文献
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