JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
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2024
·Vol. 333
·期 3
·1343-1356
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IF 1.5
Bi Dongxu,Cai Weiqian,Xiong Lingshan,Luo Qie,Wang Youqun,Zhang Zhibin,Xu Lin,Cao Xiaohong,Liu Yunhai
Three types of magnetic mesoporous silicas (MMSs), namely, MMCM-41, MMCM-48 and MSBA-15 were prepared by a hydrothermal method using CTAB and P123 as templates. The structure and physicochemical properties of MMSs were characterized by small angle XRD, VSM, ζ potential analyzer, contact angle measurer, and XPS, etc. The potential applications of MMSs in U(VI) recovery were thoroughly investigated. The adsorptive kinetics, thermodynamics, and selectivity of MMCM-41, MMCM-48 and MSBA-15 were compared. The results show that MSBA-15 revealed a high capacity for U(VI) (341.94 mg·g −1 ) and a superior selectivity than MMCM-41 and MMCM-48. The adsorption mechanism was explored by using the relevant adsorption models and XPS. The results indicated that MSBA-15 could be considered a strong candidate for the adsorption and recovery of U(VI) from radioactive wastewater.
研究领域:
环境科学
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材料科学
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化学工程
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核技术
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DOI
高影响因子
Desalination and Water Treatment
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2024
·
IF 1
Dapeng Zhang,Zicheng Yao,Han Zhang,Guiru Zhu,Lu Liu,Congjie Gao
A novel strategy to fabricate thin film nanocomposite (TFN) membrane was reported by dispersing nanofillers in the aqueous and organic phase simultaneously via interfacial polymerization of m-phenylenediamine and trimesoyl chloride. Two different nanofillers (hydrophilic MCM-48 and hydrophobic ZIF-8) were used to investigate the new strategy. Both hydrophilic MCM-48 and hydrophobic ZIF-8 can effectively improve the separation performance of the TFN membrane with higher water flux value maintaining high salt rejection via the novel strategy than conventional TFN membrane prepared with same total amount nanoparticles in singly organic phase or aqueous phase. It indicates that the new strategy is feasible to obtain the TFN membrane with excellence separation performance compared with the conventional method by dispersing nanofillers in singly phase. The new strategy is realized by dispersing less amount nanofillers in both phases simultaneously, which is possible to avoid the aggregation of nanoparticles and maximize the effect of nanoparticles.
研究领域:
材料科学
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膜分离技术
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纳米复合材料
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环境工程
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化学工程
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 10
·6110-6123
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IF 4.22
Fu Tianyi,Ding He,Zhang Jingshuang,Bai Peng,Lyu Jiafei,Guo Xianghai
Abstract Hierarchical aluminosilicate zeolites with uniform mesoporosity were successfully synthesized by one-stage crystallization under constant temperature with a novel single-head quaternary ammonium salt ([C 18 H 37 –N + (CH 3 ) 2 –C 6 H 12 –N(CH 3 ) 2 ]Br − ) as mesoporogen and structure-directing agent (SDA). Through precisely controlling the molar ratio of Si/Al and synthetic time, the mesoporous 3D wormhole framework (MCM-48) and crystalline microporous MFI structure were simultaneously constructed, revealed by a series of in-depth characteristic studies. Combining the advantages of the significantly improved diffusion from the mesoporous MCM-48 and the strong framework acidity of the crystalline microporous MFI zeolite, the hierarchical aluminosilicate zeolites exhibited outstanding catalytic activity with good reusability towards bulky aldol condensation compared with the conventional meso- or microporous zeolites. Graphical abstract
研究领域:
材料科学
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化学工程
·
催化
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Fengwei Huang,Huimin Hao,Wenlong Sheng,Xiaoyun Dong,Xianjun Lang
Ti-containing mesoporous silica materials with a well-defined structure could give a clear picture of the elusive reaction pathways in photocatalysis. However, the dispersion of Ti sites usually results in their bandgaps being larger than that of TiO 2 , which makes the narrowing of bandgaps more challenging to construct visible light photocatalysis. Here, Ti-MCM-48 with an ordered cubic mesostructure and a homogeneous dispersion of Ti sites were successfully synthesized to embed an organic dye alizarin red S (ARS), affording a visible light photocatalyst ARS – Ti-MCM-48. The selective aerobic oxidation of sulfides into sulfoxides driven by green light over ARS – Ti-MCM-48 was accomplished directly. Notably, both electron transfer and energy transfer pathways were involved in the activation of O 2 , in which the Ti sites play a crucial role. Importantly, the photobleaching was effectively alleviated by embedding ARS into the mesopores of Ti-MCM-48. Moreover, high selectivities of desired sulfoxides were favorably achieved. In general, Ti-containing porous materials could be a unique scaffold for embedding photoactive molecules to carry out selective organic transformations driven by visible light.
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DOI
高影响因子
FUEL
·
2026
·
IF 7.8
Haibiao Yu,Yudong Li,Yuanting Du,Ruixi Yang,Weijun Shan,Yuejiao Wang,Ruan Chi,Ying Xiong
The catalytic production of butene from biomass-derived γ-valerolactone (GVL) plays a crucial role in advancing sustainable energy development. In this paper, MCM-48 featuring a large surface area and ordered three-dimensional mesoporous structure, was prepared using a hydrothermal method with CTAB as the template agent. The final solid acid x wt%Al-MCM-48 catalysts were then synthesized via a simple impregnation method, using AlCl 3 as the aluminum source and ethanol as the solvent. It was found that aluminum species exist on the surface of MCM-48 in tetra-, quintu-, and hexa -coordinated forms, which leads to the formation of a substantial number of weak Brønsted and Lewis acid sites. Although the introduction of Al species further reduces the specific surface area of the catalyst, the optimal 9wt%Al-MCM-48 catalyst still maintains a high value of 651 m 2 ·g −1 , with the largest number of weak acid sites, amounting to 0.60 mmol·g −1 . The ordered three-dimensional mesoporous structure, large number of surface weak acid sites, and suitable ratio of Brønsted to Lewis acid endow the 9wt%Al-MCM-48 catalyst with high catalytic activity for the conversion GVL to butene. Upon optimization of the reaction parameters, the 9wt%Al-MCM-48 catalyst achieves a butene yield of over 90% within a 90 min reaction period at 300 °C. Further evaluation of the catalyst’s cycling stability revealed that it maintains 74% of butene yield following five consecutive cycles.
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2025
·
IF 21.1
Zhangtao Liu,Shuhan Fu,Yuhui Wang,Zhenyang Xu,Yueguang Chen,Ning Xiao,Shangyi Li,Tingting Zhang
A novel spin-state engineering strategy was developed via La doping to break the “oxo wall” and boost high-valent Co(IV)=O generation for efficient per- and polyfluoroalkyl substances (PFASs) degradation. This was achieved by constructing unsaturated CoO 3 single atoms anchored on La-doped MCM-48 (CoLa@MCM-48) via one-pot synthesis, which enabled synergistic activation of peroxymonosulfate and ozone. The optimized catalyst achieved 99.5 % degradation of PFASs substitute sodium p-perfluorous nonenoxybenzene sulfonate (OBS) in 30 min, while maintaining robust performance across diverse water matrices. The incorporation of La induces asymmetric lattice strain through its large ionic radius and spin-orbit coupling, transforming the Co coordination geometry from conventional octahedral symmetry to an unsaturated trigonal planar CoO 3 configuration with a high-spin state, thereby enhancing the 88.8 % generation of Co(IV)=O. This work establishes heteroatom-mediated spin-state engineering for designing high-performance non-radical catalysts to remediate recalcitrant pollutants.
研究领域:
环境催化
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材料化学
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污染控制化学
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高级氧化技术
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配位化学
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表面科学
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纳米催化
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产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2015
·
IF 3.453
Yu Fu,Wangcheng Zhan,Yanglong Guo,Yanqin Wang,Xiaohui Liu,Yun Guo,Yunsong Wang,Guanzhong Lu
Ce-doped MCM-48 (Ce-MCM-48) mesoporous molecular sieve was prepared hydrothermally and its surface was modified with organic groups or fluorine, and their physicochemical properties were characterized by XRD, low-temperature N 2 adsorption, TEM, UV–visible and FT-IR spectroscopies, XPS and contact angle measurement. The results indicated that Ce species were highly dispersed on the MCM-48 materials as Ce 3+ and Ce 4+ . After post-functionalization of Ce-MCM-48, the organic groups or fluorine species have been immobilized on the surface of Ce-MCM-48, but the chemical status of Ce species were hardly changed, and the post-functionalization improved the surface hydrophobicity of the Ce-MCM-48 sample. The catalytic activity testing for the oxidation of cyclohexane with molecular oxygen showed that, Ce-MCM-48 after post-functionalization exhibited the higher cyclohexane conversion and selectivity to cyclohexanol and cyclohexanone, 8.9% cyclohexane conversion with 91.2% selectivity to cyclohexanone and cyclohexanol could be achieved over the Ce-MCM-48 with F-modified catalyst, which was attributed to the proper modification of their surface properties including hydrophobicity and polarity. The F-modified catalyst also showed excellent reusability, and its catalytic performance has no obvious deterioration after being repeatedly used five times.
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高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
·
IF 10.753
Shuting Xiao,Ali Shoaib,Jiang Xu,Daohui Lin
Nanopesticides are attracting increasing attention as a promising technology in agriculture to improve insecticidal efficacy, decrease pesticides uses, and reduce potential environmental impacts. We synthesized mesoporous silica nanoparticles , i.e., Mobil Composition of Matter No.48 (MCM-48), with different sizes (63–130 nm), charges (−22 to 12 mV), and hydrophobicity (water contact angle 29–103°) to assess their loading amount and release of a typical poorly soluble halogenated pyrethroid (i.e., lambda-cyhalothrin particles, LCNS). The smallest MCM-48 displayed relatively higher loading amount of LCNS (~16%) compared to the larger MCM-48 nanoparticles, likely because of its higher pore volume (1.46 cm 3 g −1 ) and pore size (3.56 nm). LCNS loading amount was further improved to ~26% and ~36% after –NH 2 (positively charged) and –CH 3 (hydrophobic) functionalization, respectively, probably due to hydrogen bonding, electrostatic, and hydrophobic interactions with LCNS. Loading LCNS in MCM-48 nanoparticles also significantly improved its dispersion in water and ultraviolet (UV) light stability, with a 3–7 times longer half-life than that of free LCNS. Although the –NH 2 and –CH 3 modifications of MCM-48 slightly decreased the UV stability of LCNS, they significantly decreased the release efficiency of LCNS, possibly because of their stronger interactions with LCNS. In addition, the insecticidal effects of LCNS-loaded MCM-48 were more efficient and longer than those of free LCNS. The findings clarify the relationships between physicochemical properties and performance of mesoporous silica nanoparticles, and will inform the rational design of materials for controlled release of pesticides and sustainable control of pests.
研究领域:
农业科学
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纳米技术
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环境科学
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产品关联
DOI
PubMed
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2025
·
IF 4.7
Xiao Dan Sun,Dawei Feng,Jia Xu,Xue Gao,Kai Yan,Zhenhua Tian
Zwitterionic poly(ionic liquids) (ZPILs) were used as a combination tanning agent to enhance the absorption of chromium tanning agent and dyes simultaneously, which is crucial and challenging during the tanning process. Mesoporous silica (MCM-48) with a size of ∼70 nm was introduced as a nanotainer to adsorb photoinitiator and a small quantity of methylacrylic acid (MAA), and then ILs monomer and MAA were added and they started to polymerize in the pores of MCM-48, which could avoid the gelation of ZPILs in aqueous solution. In this way, the obtained nanocomposites (M48/PMIL) had a smaller size (200–500 nm) and good fluidity, so they were suitable to use as tanning agent. The addition of M48/PMIL made the shrinkage temperature and thickness rate of leather increase by 5.5 °C and 22 % than Cr-tanned leather, respectively. Meanwhile, mechanical properties are also improved further. Moreover, the Cr 2 O 3 content in tanning liquor decreased by 28.8 %, and the anionic dye absorption rate enhanced by 7.9 %, respectively, due to the good permeability and the presence of zwitterion in M48/PMIL. This novel tanning agent exhibits a potential application in less chromium tanning and decreases the Cr 3+ and dye content in tanning liquor.
研究领域:
材料科学
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高分子化学
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纳米技术
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环境科学
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皮革技术
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）