Materials Today Chemistry
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2022
·
IF 7.613
Tian Xia,Zhuangzhuang Wu,Ying Liang,Wenxin Wang,Yongpeng Li,Zhuyin Sui,Linlin Shan,Chaokun Li,Ruimei Fan,Qi Chen
The design and fabrication of versatile covalent organic frameworks (COFs) with multiple properties for diverse applications is highly desirable. Here, the difunctional COFs material g–C 18 N 3 –COF was prepared and modified to be applied for efficient photocatalytic degradation of Rhodamine B (RhB) and pH detection, respectively. Owing to the triazine unit which was suitable for photocatalyst construction, g–C 18 N 3 –COF was sensitive to visible light and exhibited excellent photocatalysis capability toward RhB. Specially, the photocatalytic degradation of RhB with a high concentration of 300 ppm using g–C 18 N 3 –COF reached equilibrium within 6 h. Moreover, g–C 18 N 3 –COF was further grown in-situ onto the filter paper to generate a novel composite material g–C 18 N 3 –COF@Paper with bright yellow fluorescence. g–C 18 N 3 –COF@Paper could visualize the pH detection by remarkable changes in its fluorescent intensity and color in the range of pH value from 1 to 5, on account of the protonation of the nitrogen atoms from the triazine ring in g–C 18 N 3 –COF. The triazine-based sp 2 carbon-conjugated g–C 18 N 3 –COF, respectively, used as photocatalyst and sensor in this work offers a new strategy to construct the versatile COFs material, facilitating the application of functional COFs in the environmental protection field.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Guoqiang Yu,Yuyang Liu,Xuejie Yang,Yarong Li,Yongqiang Li,Yanbo Zhang,Chiyang He
Synthesis of fully sp 2 -carbon conjugated covalent organic frameworks (COFs) is generally considered extremely challenging due to the low reversibility of the C C bond. Herein, a novel sp 2 -carbon conjugated COF material, named sp 2 c-TFPA-pXD, was prepared by Knoevenagel reaction employing tris(4-formylphenyl)amine with triangular geometry as the knot and p-xylylene dicyanide with symmetric structure as the linker unit. The C C linkages topologically connect the two precursors to a fully sp 2 -carbon conjugated 2D lattice and develop an eclipsed layer framework, giving sp 2 c-TFPA-pXD outstanding stability. The prepared sp 2 c-TFPA-pXD does not decompose in nitrogen atmosphere up to 323 °C, and can be stably present in boiling water, acids, bases and common organic solvents. The excellent chemical and thermal stability of sp 2 c-TFPA-pXD makes it suitable for the harsh environment of radioiodine treatment. In fact, sp 2 c-TFPA-pXD shows moderate iodine capture capacity in iodine vapor (1.22 g/g), and also shows acceptable iodine capture performance under real industrial conditions of high temperatures and low iodine concentrations. The iodide capture properties of sp 2 c-TFPA-pXD can be attributed to its regular channels and sp 2 -carbon conjugate structure. In addition, sp 2 c-TFPA-pXD can be reused by simple ethanol soaking treatment, and can almost maintain its original iodine capture performance after five cycles. In addition, sp 2 c-TFPA-pXD also displays noteworthy capability as adsorbent for iodine in cyclohexane solution. Our study confirms that sp 2 c-TFPA-pXD is an excellent candidate material for capturing iodine from air and solutions in harsh environments. We hope that the report of sp 2 c-TFPA-pXD for iodine capture could open up new avenues for sp 2 -carbon conjugated COFs applications and encourage more research to explore the radioiodine capture potential of other stable COFs.
研究领域:
材料科学
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环境科学
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放射性废物处理
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产品关联
DOI
高影响因子
Solar RRL
·
2025
·
IF 4.7
Ziyang Jia,Yang Lu,Wenyan Li,Yiyi Fan,Yawen Tang,Lei Cheng,Hanjun Sun
Covalent organic frameworks (COFs), are promising candidates for photoelectrochemical hydrogen evolution reaction (PEC HER). In this study, sp 2 -c COF photocathodes were synthesized on copper foam via Knoevenagel condensation polymerization, with the crystallinity systematically tuned by varying reaction conditions. By modulation, the alkalinity of the reaction system, crystallinity-related parameters were optimized, revealing significant variations in the structural integrity of the resulting sp 2 -c COFS. Under optimal synthesis conditions (110°C, 30 μL pyridine, 2 days), the photocathode demonstrated a photocurrent density of 60 μA cm −2 at 0.3 V versus RHE, a value 2.5 times higher than that observed for samples with suboptimal crystallinity. These results emphasize the positive impact of increased crystallinity in improving PEC HER performance and provide insights for scalable photocathode design.
研究领域:
材料化学
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物理化学
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能源科学
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纳米材料
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电化学
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产品关联
DOI
高影响因子
Analytical Methods
·
2022
·Vol. 14
·期 24
·2389-2395
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IF 3.532
Jia You,Qianqian Kong,Cuiling Zhang,Yuezhong Xian
A new fully conjugated covalent organic framework material (COFTFPPy–ThDAN) has been synthesized via the Knoevenagel condensation reaction using 1,3,6,8-tetra(4-formylphenyl)pyrene (TFPPy) as the chromogenic unit and 2,2′-([2,2′-bithiophene]-5,5′-diyl)diacetonitrile (ThDAN) as the linker. The COFTFPPy–ThDAN has been successfully prepared under the optimized conditions and showed excellent crystallinity and chemical stability. Especially, it was able to maintain its crystallinity even when immersed under harsh conditions such as HCl (3 M) and NaOH (3 M). Meanwhile, COFTFPPy–ThDAN exhibited good fluorescence properties, which could remain relatively stable under different pH conditions. Moreover, COFTFPPy–ThDAN was further employed for the detection of Fe3+ with high sensitivity and selectivity with a limit of detection (LOD) of 1.26 μM. COFTFPPy–ThDAN with high stability and fluorescence is a promising material for chemical sensing.
研究领域:
材料科学
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分析化学
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化学传感
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Lisha Liang,Yuxiang Zhao,Wuxin Zhang,Haokai Yan,Mengwei Chen,Yuan Chen,Jin Zhou,Tao Zhang
The sp 2 -carbon-conjugated porous polymers (sp 2 c-CPPs) that possess high porosity, chemical stability, and carrier mobility are potential for uranium extraction from seawater, which is tremendous meaningful for the rapidly growing demands of the nuclear industry due to the abundant uranium resources (4.5 billion tons) in ocean. Here, we report the synthesis of three sp 2 c-CPP films (DMPN-TFPT, BN-TFPT and TMTN-TFPT) directly on Cu substrate that can work as electrodes for electrochemical uranium extraction. Furthermore, we designed a photovoltaic-electrocatalysis (PV-EC) system to enhance the uranium extraction capacity, meanwhile, modified oxime groups on sp 2 c-CPPs film to enhance uranium ion selectivity. The DMPN-TFPT electrode shows ultra-high uranium extraction performance (1022.02 mg m −2 ) in 8 ppm uranyl-spiked simulated seawater, which is higher than that of BN-TFPT film (426.27 mg m −2 ) and TMTN-TFPT film (607.30 mg m −2 ) because of the higher in-plane electron delocalization. Additionally, in ultra-low concentration of simulated seawater (3.3 ppb), the DMPN-TFPT film also exhibited a high capacity up to 81.74 mg m −2 within 30 days. This work shows the great potential of sp 2 c-CPP films on solar-driven electrochemical uranium extraction.
研究领域:
材料科学
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环境工程
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核工程
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电化学
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太阳能
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）