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Microporous and mesoporous materials
Elsevier Science BV
Microporous and mesoporous materials

Elsevier Science BV

1387-1811

Microporous and mesoporous materials/Journal Microporous and mesoporous materialsISTPCCREISCI
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    A novel covalent-organic framework for highly sensitive detection of Cd2+, Pb2+, Cu2+ and Hg2+

    Pei, LongshengSu, JianpoYang, HanlunWu, Yao...
    8页
    查看更多>>摘要：A novel covalent-organic framework (COFMELE-BTDD) containing multiple heavy metal ions (HMIs) adsorption sites was synthesized and applied to electrochemical sensing HMIs and Hg2+ adsorption. The COFMELE-BTDD was prepared by amine-aldehyde condensation of 2,5,8-triamino-s-heptazine (MELE) and 4,4'-(benzo[c] [1,2,5] thiadiazole-4,7-diyl)dibenzaldehyde (BTDD). The COFMELE-BTDD is a two-dimensional crystal nanosheet with highly ordered conjugated structure, and the pore size is 3.7 nm. A novel electrochemical sensor for the determination of Cd2+, Pb2+, Cu2+, Hg2+ was constructed with COFMELE-BTDD. Each unit of COFMELE-BTDD has multiple active sites for HMIs (N-S-N, -C=N), which can sensitively capture HMIs. The influence of experimental parameters (the amount of COFMELE-BTDD, pH value of electrolyte, deposition time and deposition potential) on electrochemical sensor was studied. The detection limits of Cd2+, Pb2+, Cu2+, Hg2+ are 0.00474 mu M, 0.00123 mu M, 0.00114 mu M, 0.00107 mu M, respectively. The sensitivities are 105.0 mu A mu M-1 cm(-2), 405.5 mu A mu M-1 cm(-2), 439.0 mu A mu M-1 cm(-2) and 465.1 mu A mu M-1 cm(-2). The sensor has good stability, reproducibility and anti interference ability. The COFMELE-BTDD can effectively remove Hg2+ in water samples. The results show that the COFMELE-BTDD has great potential in adsorption and detection of HMIs.
      原文链接:
    • NSTL
    • Elsevier

    A rapid synthesis of Hf-Beta zeolite as highly active catalyst for Meerwein-Ponndorf-Verley reduction by controlling water content of precursor gel

    Nakamura, TaichiKamiya, YuichiOtomo, Ryoichi
    9页
    查看更多>>摘要：Hf-Beta is a promisingly active Lewis acid catalyst for Meerwein-Ponndorf-Verley (MPV) reduction and other important organic reactions. However, the conventional hydrothermal synthesis of Hf-Beta inevitably requires the troublesome procedure for hydrolysis of tetraethoxysilane and the long period to complete crystallization. In the present study, we applied a synthetic approach of reducing water content of precursor gel and succeeded in considerably shortening the period for crystallization of Hf-Beta using fumed silica as silicon source. By using precursor gel with H2O/SiO2 = 1.4-7.6, effect of water content of precursor gel on the crystallization of Hf-Beta, the incorporation of Hf into the zeolite framework, and the catalytic performance were thoroughly investigated. Low water content was favorable for accelerating the crystallization, but unfavorable for the incorporation of Hf into the zeolite framework, resulting in poor catalytic activity. With the assistance of seed crystal, Hf-Beta with a relatively large amount of framework Hf was obtained from the precursor gel with H2O/SiO2 = 6.4 in 24 h. HfBeta synthesized in this way showed higher catalytic activity for MPV reduction than Hf-Beta as well as Zr-, and Sn-Beta synthesized by the conventional hydrothermal method.
      原文链接:
    • NSTL
    • Elsevier

    One-pot synthesis of hierarchical MnCu-SSZ-13 catalyst with excellent NH3-SCR activity at low temperatures

    Wang, ZhihengXu, XiZhu, YvxiaoHe, Hong...
    9页
    查看更多>>摘要：Cu-SSZ-13 catalyst with small pore structure has been considered as one of the most efficient catalysts in controlling NOx emissions from the diesel vehicles. But the low NOx conversion in the temperature range of < 200 degrees C seriously limits its wide applications in many situations. In this study, in order to improve the NH3-SCR performance at low temperatures, MnCu-SSZ-13-OP and Cu-SSZ-13-OP catalysts were successfully prepared by one pot method. Experimental results indicated that the Mn and Cu co-doped catalyst had excellent SCR activity with 68% of NOx conversion at 150 degrees C compared to the Cu-SSZ-13-OP catalyst with NOx conversion of 31%. Meanwhile, the MnCu-SSZ-13-OP catalyst exhibited higher low-temperature activity than Cu-SSZ-13-OP catalyst (71% vs 51% NOx conversion at 200 degrees C) even after hydrothermal treatment, which should be attributed to the highly dispersed Mn species and its unique NO adsorption properties. Particularly, the hierarchical pores structure of MnCu-SSZ-13 played key roles for the distribution of active sites and gas diffusion. The in situ XRD results also found that the addition of TEPA and a small amount of Mn species during the synthesis process had no obvious influence on the thermal stability of the zeolite catalysts. This study also provides a new guidance to the design and simple synthesis of the catalyst based on SSZ-13zeolite with high-performance for the removal of NOx at a broad temperature window.
      原文链接:
    • NSTL
    • Elsevier

    From structure evolution of palygorskite to functional material: A review

    Lu, YushenWang, Aiqin
    18页
    查看更多>>摘要：Palygorskite (PAL) is a modulated rod-like phyllosilicate with abundant reserves in nature, which has the characteristics of a 2:1 layered-chain crystal structure, one-dimensional nanorod crystal morphology, regularly arranged tunnels/channels, and rich surface active sites. In the long-term research process, various modification strategies have been conducted to adjust the order of the structure, regulate the pore structure, change the stacking pattern, and further optimize the morphological characteristics and surface properties of PAL to improve its application performance and expand its application range. Currently, it has been possible to manipulate the basic tetrahedron-octahedron of PAL and even self-assemble available components to promote the rearrangement or reconstruction of the PAL structure to transform into new mineral functional materials. Structural evolution provides a new approach for better application of PAL in wider fields. This article comprehensively reviews the different ways to induce the structural evolution of PAL to fabricate functional materials and emphasizes the sustainable development paths for the transformation and utilization of low-grade PAL clay with a variety of complex associated minerals. It is expected that the summary of the structural evolution process of PAL can help to understand the structure at a deeper level and develop novel functional materials in a wider dimension, ultimately facilitating the value-added, comprehensive, and ecological development of PAL clay resources.
      原文链接:
    • NSTL
    • Elsevier

    Boosting Zn-ion storage capacity of pitch coke-based activated carbon via pre-oxidation assisted KOH activation strategy

    Zhang, XushengTian, XiaodongSong, YanWu, Jinru...
    11页
    查看更多>>摘要：Activated carbons (ACs) with unique structure are desired for high-performance of Zinc-ion supercapacitors (ZICs). Herein, a series of ACs were prepared using air pre-oxidation assisted KOH activation technology from pitch coke (PHC). The results show that pre-oxidation promotes the development of pore and the regulation of surface chemical composition of obtained ACs. Based on this experiment, the as-prepared AC-330 delivers suitable oxygen functional groups, high specific surface area of 3223 m(2) g(-1) and high small-sized mesopore (2-4 nm) volume of 0.72 cm(3) g(-1). All these unique structures endow AC-330 with a satisfactory specific capacity of 212.5 mAh g(-1) at 0.1 A g(-1), and it can still remain at 85 mAh g(-1) even when the current density increased up to 20 A g(-1) with an excellent capacity retention of 40%. Fortunately, it can also deliver high energy-power density parameters (170 Wh kg(-1) at 170.4 W kg(-1) and 67.2 Wh kg(-1) at 32.3 kW kg(-1)).
      原文链接:
    • NSTL
    • Elsevier

    Ni Nanoparticles supported on N-doped carbon nanotubes for efficient hydrogenation of C5 hydrocarbon resins under mild conditions

    Wei, QiaoluChen, XiaopengHe, YaojingFu, Jiawei...
    12页
    查看更多>>摘要：The catalytic hydrogenation of hydrocarbon resins to high value-added products represents a prospective technology to upgrade the pyrolysis gasoline byproduct, while pore diffusion is challenging. Herein, Ni nano particles supported on nitrogen-doped carbon nanotubes (Ni/NCNTs) were designed and synthesized via an impregnation method. The as-prepared Ni/NCNTs exhibit superior hydrogenation of large molecular C5 hydrocarbon resins (C5HR) catalytic activity under mild conditions relative to that reported by literature, and the degree of hydrogenation (DH) for C5HR with a water-white appearance reach up to 95.5%. Combined with the BET, TEM, XPS, H-2-TPR analysis results, the catalytic performance of Ni/NCNTs catalyst could ascribe to that the unique structure of NCNTs carrier provides a more accessible surface area that accounts for 88.1% of the specific surface area to expose abundant active sites, and small nickel nanoparticle sizes (less than 10 nm). Additionally, Ni/NCNTs exhibit higher stability for C5HR hydrogenation than Ni/CNTs catalyst, which attributes to the efficient anchor ability of N defect and the formation of Ni-N units.
      原文链接:
    • NSTL
    • Elsevier

    Promotional synergistic effect of fine-tuned mordenite: Overcoming the selectivity limitations of naphthalene alkylation with tert-butyl alcohol

    Cai, MengluWang, XiaozhongMo, YimingChen, Yingqi...
    8页
    查看更多>>摘要：The selectivity limitations of tert-butylation of naphthalene for obtaining 2,6-di-tert-butylnaphathalene (DTBN) was overcame (2,6-/2,7-DTBN>30) over fine-tuned mordenite. With citric acid (CA) and zirconium modification, the synergistic effect of the alkylation catalyst was promoted and the ratio of 2.6-/2,7-DTBN increased after controlling the reaction conditions. Only requires 5.0 equivalents of solvent, 3.0 equivalents of tert-butanol and 20 wt% of catalyst dosage, the ratio of 2,6-DTBN/2,7-DTBN can reach to 49, overcoming the selectivity barriers in naphthalene alkylation reaction. Present study reveals that high 2,6-selectivity can be realized with the optimized acidity, enhanced synergistic effect and fine-tuned zeolite structures.
      原文链接:
    • NSTL
    • Elsevier

    The use of H-form clinoptilolite to preconcentrate trace amounts of Nd(III) from aqueous solution under dynamic conditions

    Slota, EmiliaVasylechko, VolodymyrPatsay, IhorGolebiowski, Adrian...
    9页
    查看更多>>摘要：Rare earth elements (REE) are vital in the industry, particularly in the manufacturing of high-tech products. REE are emitted in enormous amounts into the environment as a result of their increased use in industry. The sorption technique is one of the most efficient ways to extract rare earth elements in low quantities. The results of a dynamic study of the sorption capabilities of the H-form of Transcarpathian clinoptilolite towards Nd(III) are presented in this work. X-ray diffraction, FT-IR, zeta potential analysis, and potentiometric titration were used to analyze the sorbent. The breakthrough capacity of H-clinoptilolite toward Nd(III) was 3.1 mg g-1 under ideal conditions (pH = 7.5, sorbent thermal treatment temperature: t = 150 degrees C). The desorption efficiency of Nd(III) has been investigated using acids and different mineral salt solutions. The optimum desorbing agent appeared to be acidified (pH 4) 1 M KNO3 solutions. A method for preconcentrating trace amounts of Nd(III) using acid-modified Transcarpathian clinoptilolite in a solid-phase extraction mode is proposed, followed by spectrophotometric measurement of this rare earth element.
      原文链接:
    • NSTL
    • Elsevier

    Review on porous materials for the thermal stabilization of proteins

    Roth, Rhianna E.Funk, Elizabeth K.Gao, PhillipCorbin, David R....
    17页
    查看更多>>摘要：Proteins, the key components of vaccines, enzymes and many types of therapeutics, are sensitive to denaturing and loss of structure when exposed to high temperatures. One way to thermally stabilize proteins is through immobilization on a porous support. In this review, a comparative analysis of the literature reports on the most relevant porous materials for protein thermal stability is presented. The materials fall into two main categories: inorganic porous materials and organic polymer materials. Inorganic porous materials for protein immobilization include metal oxides (e.g., aluminum oxides, and iron oxides), silicon dioxides, activated carbons and metal organic frameworks. Organic polymer materials include both natural and synthetic polymers, with natural polymers (e.g., agarose, chitosan and alginate) being by far the most widely studied type of material for enzyme immobilization. Support materials, support surface chemical modification agents, and degree of thermal stability are discussed in detail. The review may be helpful in selecting the optimum support material and surface modification process for a given protein to increase thermal stability.
      原文链接:
    • NSTL
    • Elsevier

    On the impact damage resistance and tolerance improvement of hybrid CFRP/Kevlar sandwich composites

    Basha, MuhammadWagih, A.Melaibari, A.Lubineau, G....
    11页
    查看更多>>摘要：[1] S.Z.H. Shah, S. Karuppanan, P.S.M. Megat-Yusoff, Z. Sajid, Impact resistance and damage tolerance of fiber reinforced composites: a review, Compos. Struct. 217 (2019) 100-121. [2] M.V. Hosur, M. Adbullah, S. Jeelani, Studies on the low-velocity impact response of woven hybrid composites, Compos. Struct. 67 (3) (2005) 253-262.
      原文链接:
    • NSTL
    • Elsevier