MICROPOROUS AND MESOPOROUS MATERIALS
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2015
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IF 3.453
Jianming Zhang,Meng Li,Yanjun Lin,Cheng Liu,Xiangyan Liu,Lu Bai,Deng Hu,Gaofeng Zeng,Yanfeng Zhang,Wei Wei,Yuhan Sun
All-silica zeolite DDR was prepared by microwave-aided hydrothermal synthesis and characterized by X-ray diffraction, scanning electron microscopy, infra-red spectroscopy, nitrogen adsorption , elemental analysis and thermal gravimetric analysis . Microwave-aided heating significantly reduced the synthesis time from 25 d to 3 d and crystal size from 8 μm to 2 μm. With the help of seeding, the synthesis time and crystal size were further reduced to 6 h and 0.7 μm respectively. The crystal size decreased with seed content. The fragmentation of seed crystals had positive impact on reducing crystal size and increasing product yield. The aging of mother liquor and decrease of H 2 O/SiO 2 had little impact on crystal size.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
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2022
·
IF 4.889
Guanying Shao,Zeman He,Wu Xiao,Gaohong He,Xuehua Ruan,Xiaobin Jiang
Effective seeding is crucial for the accurate control of cooling crystallization. Herein, the supercooled solution near the membrane interface underwent nucleation, and the membrane-assisted seeding (MAS) was performed for the nucleation and growth control of ammonium persulfate cooling crystallization. Process analytical technologies (PAT) were introduced to obtain on-line nucleation and growth information for the evaluation of the developed MAS process. Experimental comparisons between MAS and conventional seeding crystallization indicated that an appropriate MAS condition could provide a moderate seeding condition. By controlling two key operating parameters, the optimized membrane-involved temperature (18 °C) and duration (30 min), the terminal products possessed narrow crystal size distribution (mean size, 1181 μm; coefficient of variation, 0.162), desired morphology, and high purity (>99.0 wt%). Overall, the results have verified the feasibility of MAS to crystalize products with high quality.
研究领域:
化学工程
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过程分析技术
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产品关联
DOI
高影响因子
AICHE JOURNAL
·
2019
·Vol. 65
·期 8
·e16620
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IF 3.463
Xiaoxu Zhao,Hao Zhang,Sheng Xu,Yan Wang
In this study, a novel covalent-assisted seeding method is developed to fabricate well-intergrown ZIF-8 membrane on polyimide (PI) substrate with imidazole-2-carboxaldehyde (ICA) as the covalent agent between ZIF-8 layer and PI substrate. Compared to ethylenediamine-crosslinked PI membrane and ZIF-8/PI membrane synthesized without covalent-assisted seeding method, ZIF-8/PI membrane synthesized with ICA covalent-assisted seeding method shows improved pervaporation performance for isopropanol dehydration. Subsequent surface coating with polydimethylsiloxane or polydopamine is applied to mitigate the grain boundary of ZIF-8/PI membrane, which results in a further performance enhancement. The morphologies and physicochemical properties of the resultant membranes are characterized by scanning electron microscope, attenuated total reflectance-Fourier transform infrared, X-ray diffraction, and water contact angle. The effect of operation temperature on the separation performance is also carried out. This work demonstrates the novel covalent-assisted seeding method for the preparation of ZIF-8 membrane with high-performance, which may hold a great potential for various ZIF membranes separation applications.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2025
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IF 3.9
Guojun Lv,Linfang Jiang,Yan Chen,Xuyang Zou,Xubin Zhang,Fumin Wang
The addition of an additional mesoporous/macroporous templating agent inevitably has an adverse effect on the economy and greenness of the seed-assisted synthesis process for hierarchical zeolites; hence, the development of an efficient seed-assisted method for the synthesis of hierarchical zeolite without the addition of an additional additive is appealing. Herein, we reported the preparation of hierarchical TS-1 zeolite with a large amount of mesopores using a liquid–solid mixture seed-assisted method and its application as a heterogeneous catalyst in the oxidative desulfurization reactions. The characterization results disclosed that the liquid–solid mixture seed was more conducive to the formation of hierarchical TS-1 zeolite than liquid seed alone and solid seed alone. The formation process of hierarchical TS-1 zeolite with different crystallization times was investigated in detail, and accordingly, a possible two-stage crystallization mechanism was proposed. In addition, the synthesized hierarchical TS-1 zeolite showed remarkably enhanced catalytic activity in the oxidative desulfurization of dibenzothiophene (DBT) and 4,6-dimethyldibenzothiophene (4,6-DMDBT) in comparison to the conventional microporous TS-1 zeolite. This work provides some guidance for the development of a more efficient and greener seed-assisted synthesis method for hierarchical zeolites without the addition of any additional mesoporous/macroporous templating agent.
研究领域:
材料科学
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催化化学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
LUMINESCENCE
·
2021
·Vol. 36
·期 8
·1901-1909
·
IF 2.464
Yan-hong Liu,Xiao-guang Ma,Li-ye Zhu,Meng Li,Xiao-xia Ren,Man Zhang
The SiO 2 @SiO 2 :Tb(1,2-BDC) 3 phen microspheres with monodispersed core-shell structure, are kind of fluorescent particles, which are prepared by a seeded growth method under the catalysis of glacial acetic acid (1,2-BDC, 1,2-benzenedicarboxylic acid; phen, 1,10-phenanthroline). Firstly, silica seed was fabricated by the hydrolysis of ethyl orthosilicate, and the Tb(1,2-BDC) 3 phen was prepared by using 1,2-BDC and phen. Then, a thin mesoporous silica shell doped with Tb(1,2-BDC) 3 phen was grown on the prepared monodisperse silica colloids. The prepared phosphor was analyzed by Fourier-transform infrared spectroscopy, X-ray diffraction analysis, scanning electron microscopy, transmission electron microscopy, thermogravimetric and fluorescence spectroscopy. The experimental results showed that the diameter of the SiO 2 @SiO 2 :Tb((1,2-BDC) 3 phen microsphere was about 200 nm with a typical core-shell structure, among which the diameter of the silica core was 180 nm, and that of the mesoporous silicon shell doped with terbium complex was about 10 nm. The fluorescence intensity of SiO 2 @SiO 2 :Tb((1,2-BDC) 3 phen microsphere is nearly three times higher than that of Tb((1,2-BDC) 3 phen complexes. The prepared microspheres could be widely used in bio-imaging, optoelectronic appliances and medical diagnosis.
研究领域:
材料科学
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光学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Hongjin Wang,Shuangqing Zhou,Tao Wang,Zhiye Zhou,Yanggen Huang,Stephan Handschuh-Wang,Hongyu Li,Ying Zhao,Yongbing Tang
Long-term exposition of electrodes to aqueous media inevitably results in biofouling and adhesion of bacteria, reducing the electrolysis efficiency of electrodes for water treatment. To ensure technically efficient antifouling of materials for durable electrodes, hierarchical micro-/nano structured boron-doped diamond (BDD) electrodes were designed and synthesized. Multi-level structured BDD was coated on titanium mesh by a bottom-up strategy, based on a combination of self-assembly seeding and hot filament chemical vapor deposition (HFCVD) growth. The morphology of the BDD coating can be controlled by manipulating the seeding density and boron doping concentration. The designed micro/nano hierarchical structure of the BDD electrode suppressed bacterial adhesion greatly and exhibited excellent anti-biofouling efficiency with an antibacterial rate of ∼ 93 %, which entails simplified self-cleaning and durable BDD-coated electrodes. The BDD-coated electrodes were employed to electrochemically treat Escherichia coli -contaminated water, killing virtually all bacteria (≥99.9 %) in 1 min. Finally, real river water was electrochemically treated, reducing the chemical oxygen demand (COD) down to 5 mg/L in 4 h. The excellent performance shows the great potential of the structured BDD electrodes for long-term water purification .
研究领域:
材料科学
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环境工程
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电化学
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水处理
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产品关联
DOI
PubMed
高影响因子
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