APPLIED ORGANOMETALLIC CHEMISTRY
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2018
·Vol. 32
·期 10
·e4511
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IF 3.581
Yuanyuan Wang,Jicheng Xu,Dongya Yang,Tao Zhang,Fengxian Qiu,Jianming Pan
Calixarenes have been drawing tremendous interest due to their special structure, superior properties and numerous applications. In this work, a novel adsorbent material, calix[4]arenes functionalized dual-imprinted mesoporous film (DIMFs) for the simultaneous selective recovery of Li(I) and Rb(I), was prepared via surface ionic imprinting. Compared with ordinary adsorbent materials, the synthesis process of the films used a cheap bio-template and did not require extra steps but significantly enhances adsorption properties. The morphology and structure of prepared DIMFs were characterized by scanning electron microscopy, transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR) and nitrogen adsorption–desorption measurements. Adsorption parameters (pH and temperature), adsorption kinetics and adsorption isotherms of the DIMFs were investigated by adsorption experiments. This novel adsorbent has inorganic–organic hybrid frameworks, high specific surface area and uniform pore size. The Langmuir and Freundlich isotherms, pseudo-first-order and pseudo-second-order kinetics of DIMFs were investigated; suggesting that the adsorption data well fits the Langmuir isotherm model, and the adsorption kinetics can be described by the pseudo-second-order kinetic model. In addition, dual-imprinted mesoporous film exhibited superior selectivity for Li(I) and Rb(I). Cycle test demonstrated an outstanding of reusability, which appreciating their potential for industrial application.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Huanyu Zhou,Xiaolian Jiang,Qing Han,Minghui Qiu,Xiaowei Da,Xianfu Chen,Yiqun Fan
To achieve precise separation of bioactive molecules, an innovative strategy combining sonochemistry and in-situ ion assistance process was proposed to fabricate CeO 2 mesopore membranes with narrow pore size around 3.7 nm. Under the ultrasound cavitation, the precursors and the precipitants react uniformly at molecular scale. The residual appropriate in-situ ions dispersed around the cluster form a double electric layer, thereby enhancing the stability of the sol. During sintering, ions between the clusters generate CeO 2 , reinforcing particle neck connections while the confined space between particles restricts further CeO 2 particle growth. The resulting CeO 2 membranes possess characteristics of a single fluorite phase, high crystallinity, and narrow pore size distribution. The optimal membrane thickness of 380 nm could be formed by a 2x dilution of sol and a 30-second coating time, exhibiting a complete structure with no obvious defects. The membrane achieved a molecular weight cut-off (MWCO) of ∼4300 Da, a pure water permeance of 61 L·m -2 ·h -1 ·bar -1 , an average pore size of 3.7 nm and a roughness of 3.4 nm. In chitosan oligosaccharides (COS) preparation using cellulase, the CeO 2 membranes demonstrated 100% cellulase retention and ∼50% transmission of COS with the degree of polymerization (DP) ranging from 2 to 5, thus achieving precise separation.
研究领域:
材料科学
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生物分离工程
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Weiquan Yuan,Jingzhong Kuang,Dan Ding,Zheyu Huang
Herein, organic/inorganic multiple adsorption sites were constructed on halloysite to intensify the selective adsorption performance of the adsorbent for Al(III) in rare earth solutions. The adsorption heat behavior and thermodynamics of the composite for different ion systems were investigated using microcalorimetry. The results showed that chitosan formed a mesoporous membrane on the acid-treated calcined halloysite (Hal H) substrate through a strong electron interaction between the nitrogen atom of the amino group and the oxygen atom of Si O structure on Hal H. Wurtzite was loaded onto the chitosan mesoporous membrane as nanoparticles and partially oxidized to the ZnO phase of wurtzite. [email protected] demonstrated excellent adsorption capacity ( q max (Al 3+ ) was 102.04 mg/g), selectivity performance (Ks was 1583.06), adaptation to varying ion concentrations and structural stability in the mixed solution. Solution pH, ion concentration and temperature significantly affected the adsorption heat behavior and thermodynamics of the composite in different ion systems. The efficient selective adsorption of Al(III) by [email protected] was achieved through chelation with the amide and amino groups of chitosan and chemical interaction with sulfur groups of wurtzite. This work exemplifies a promising strategy for designing novel mineral materials with strong selective adsorption properties for the separation of Al(III) and rare earth ions.
研究领域:
材料科学
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环境化学
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吸附科学
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热力学
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矿物加工
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产品关联
DOI
PubMed
高影响因子
NANOTECHNOLOGY
·
2022
·Vol. 33
·期 38
·385703
·
IF 3.953
Mei Zhang,Lin Cui,Qiqi Mao,Ziqiang Wang,Hongjie Yu,You Xu,Xiaonian Li,Liang Wang,Hongjing Wang
Exploring cost-effective and highly active electrocatalysts is of great significance for sustainable electrochemical NH3 synthesis. Palladium (Pd)-based catalysts have been unanimously considered as one of the most efficient catalysts for the nitrogen reduction reaction (NRR). Herein, self-supported mesoporous Pd film with partial oxidation on Ni foam (mPd-PdO/NF) was synthesized through the micelle-assisted chemical replacement method coupled with air oxidation under 260 °C, and the mPd-PdO/NF electrocatalyst exhibited superior NRR performance with the maximum values of rNH3 (24.8 mg h−1 mgcat.−1) and FE (16.64%) were obtained at −0.1 V, relative to the single counterparts (mPd/NF and mPdO/NF). It is proposed that both metallic Pd and its oxide domains when co-existing with a phase boundary between them can facilitate nitrogen activation and hydrogenation, resulting in an enhanced NRR performance. This work provides an inspiring strategy for the rational design of highly active and durable metal–metal–oxide nanoarchitectonics for ammonia electrosynthesis.
研究领域:
电化学
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材料科学
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催化
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可持续化学
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）