SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Chuanhong Wang,Jun Yan,Zhongcheng Ma,Zhonggang Wang
Separation of ethylene (C 2 H 4 )/ethane (C 2 H 6 ) is important yet extremely challenging task in petrochemical industry. Herein, three microporous polymers decorated with phenyls (PAN-P), naphthyls (PAN-NA) and anthryls (PAN-AN) were designed and synthesized in order to systematically study the correlations of the varied π-conjugation structure to the selective adsorptions of C 2 H 6 over C 2 H 4 . The adsorption–desorption isotherms of C 2 H 6 and C 2 H 4 in the three polymers are completely reversible at room temperature. Moreover, it is interesting to find that at 298 K, among the three polymers, PAN-AN with the largest π-conjugation anthryl groups exhibits the highest C 2 H 6 /C 2 H 4 dynamic selectivity of 2.70. The different adsorption/separation behaviors of C 2 H 6 /C 2 H 4 in the three polymers are studied by means of the varied π-conjugation microenvironments as well as the porous characteristics such as specific surface areas, pore volumes and pore sizes and distribution.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Yachao Xu,Hongsen Zhang,Qi Liu,Jingyuan Liu,Rongrong Chen,Jing Yu,Jiahui Zhu,Rumin Li,Jun Wang
It is still a challenge to obtain uranium (U) adsorbents with high selectivity , excellent cycle stability and excellent performance through design and synthesis. In this paper, the TiO 2 /CPAN-AO catalyst was prepared by the hydrothermal method combined with high temperature cyclization dehydrogenation . TiO 2 /CPAN-AO has excellent photocatalytic properties, which can reduce U(VI) to U(IV) quickly and selectively. The generated Z-type heterojunction promotes the reduction ability of photogenerated electrons, and obtains great selectivity to UO 2 2+ (Uranyl ions) through the AO group. TiO 2 /CPAN-AO with π-electron conjugated structure broadens the spectral range through surface hybridization and prolongs the lifetime of photo-generated charges. Under the induction of light, the uranium extraction capacity of TiO 2 /CPAN-AO after 5 h of irradiation is about 2.38 g/g. TiO 2 /CPAN-AO is a catalyst with enhanced adsorption capacity, making it possible to extract uranium from large-scale natural seawater in the future.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Kaili Yao,Yi Liu,Huan Yang,Jingyou Yuan,Shaoyun Shan
In this study, a polyaniline-modified 3D-spongy SnS photocatalyst (PANI/SnS) has been prepared using an in-situ oxidative polymerization technique for the enhanced photocatalytic degradation of methyl orange. PANI/SnS reached to a rate constant of 4.040 × 10 −2 min -1 > 2 times of that pure SnS and maintained a good stability after four cycling runs for methyl orange degradation. The better photocatalytic activity and stability of PANI/SnS catalyst were ascribed to the π-conjugated structure characteristic of PANI and the interaction between PANI and SnS. On the one hand, induced π-conjugated electrons transferred from PANI to SnS could effectually inhibite the electrons and holes recombination. On the other hand, the presence of C–S and Sn-N bonds between PANI and SnS could protect the S and/or Sn element from direct exposure to the corrosive environment, then restraining photocorrosion behavior. This study implies that conductive conjugated polymer (PANI) modified tin sulfide will be a potential reusable and stable photocatalyst for methyl orange removal from waste-water by photocatalysis .
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Jiabin Li,Haoran Guan,Shiyang Zhu,Bing Liu,Hongyan Yao,Shaowei Guan
Organic electrode materials demonstrate exceptional potential for sustainable rechargeable batteries due to their tunable structure, environmental friendliness and cost-effectiveness. However, their practical application in lithium-ion batteries (LIBs) is hindered by challenges such as limited capacity, poor intrinsic conductivity and significant dissolution issues in inorganic electrolytes. To address these challenges, a novel high-performance organic cathode material for LIBs, Polymeric ladder-type benzoquinone compound (PLBQ), was designed and synthesized in this work. The rational molecular design strategy imparts PLBQ with abundant active sites (C O and C N), enhancing its theoretical specific capacity. The electron-withdrawing nature of the redox-active sites (C O) and the extended π-conjugated structure lower the lowest unoccupied molecular orbital (LUMO) energy level and reduce the bandgap, thus increasing both the operational voltage and intrinsic conductivity of the PLBQ cathode. Additionally, the synergistic π–π interactions and hydrogen bonding impart remarkable solvent resistance to PLBQ, while simultaneously enhancing the stability of its molecular structure. As a result, the PLBQ cathode exhibited outstanding electrochemical performance, including long-term cycling stability (96 % capacity retention after 1000 cycles at 1 A g −1 ), excellent rate capability (101.3 mA h g −1 at 2 A g −1 ) and high reversible specific capacity (252.5 mA h g −1 at 0.1 A g −1 ). This work offers a novel molecular design strategy for the development of high-performance organic cathode materials for future lithium-ion batteries.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ORGANIC CHEMISTRY
·
2020
·
IF 4.335
Wubing Yao,Jiali Wang,Lili He,Dongdong Cao,Jianguo Yang
A ruthenium catalytic ortho-C–H diborylation of 2-arylpyridine derivatives, including challenging 2-phenoxypyridine functions, using a remarkably low catalyst loading and a low-cost and bench-stable boron source, has been developed. The novel strategy shows high activity with excellent selectivity and may offer a versatile and green alternative to currently employed high loadings of noble metals or extra additives for the selective borylations.
研究领域:
有机化学
·
催化化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yingying Qin,Jian Lu,XinYu Zhao,Xinyu Lin,Yue Hao,Pengwei Huo,Minjia Meng,Yongsheng Yan
The precise molecular tunability strategy is deemed to have great potential to improve the photocatalytic performance of metal-free photocatalysts for applying in hydrogen evolution but remains a formidable task. We herein cover a logical design for integrating N defect engineering and π-conjugation structure into g-C 3 N 4 . The photocatalytic hydrogen evolution rate of up to 1541.6 μmol g −1 h −1 is acquired over the optimum DCN350, which has 7.5-fold increase over primal g-C 3 N 4 (205.9 μmol g −1 h −1 ). The experimental study and density functional theory (DFT) investigations confirm that DCN350 with N defects not only can shorten band gaps for expanding the light absorption range via optimizing the electronic band structure, but also act as active sites for facilitating hydrogen evolution reaction. Besides, the –C≡N as strong electron-withdrawing functional group can make the isolated valence electrons delocalized to drive the charge spatial separation. Therefore, the light absorption capacity and charge separation/transfer of g‐C 3 N 4 can be flexibly mastered via changing calcination temperature of g-C 3 N 4 and NaBH 4 . Overall, this study provides an opportunity for having a deep understanding the role of structural defects on ameliorating the photocatalytic evolution hydrogen activity.
研究领域:
材料科学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2023
·
IF 3.9
Zihuan Wei,Lina Kong,Qiang Wang,Jianping Xu,Lan Li
Conjugated structure modification is an effective strategy for improving the photocatalytic activity of graphitic carbon nitride (g-C 3 N 4 ). Herein, we introduce p-π conjugated to g-C 3 N 4 by surface grafting of hydroxyl (-OH) groups through a facile hydrothermal process to improve the photo-carriers generation and separation. Experiments and DFT calculations indicate that the hydrothermal treatment decorated –OH groups onto the C sites of g-C 3 N 4 and formed p-π conjugated structure between the 2p orbitals of the O and the π orbitals of the tri-s-triazine unit. The extended p-π electrons delocalization of g-C 3 N 4 increases the concentration of the carriers, and the –OH groups serve as electrons transport channels facilitating the separation of the carriers. Consequently, –OH grafted g-C 3 N 4 with hydrothermal treated at 120 °C exhibits the highest and recyclable H 2 evolution rates of 2.3 mmol h −1 g −1 under simulated sunlight irradiation, which outperform pristine g-C 3 N 4 1.42 times. This work proposes a new mechanism of the p-π conjugate of –OH decorated g-C 3 N 4 for improving charge carriers formation and separation, and provides a mild strategy to engineer the other conjugated molecular structures.
研究领域:
材料科学
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光催化
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理论计算
✓ 已验证
产品关联
DOI
高影响因子
ChemSusChem
·
2016
·Vol. 9
·期 17
·2351-2357
·
IF 7.116
Mingguang Pan,Ningning Cao,Wenjun Lin,Xiaoyan Luo,Kaihong Chen,Siying Che,Haoran Li,Congmin Wang
Graphical Dual-tuning method : Through the introduction of a large π-conjugated structure into the anion, a dual-tuning approach to improve CO 2 capture by anion-functionalized ionic liquids (ILs) results in high capacities of up to 0.96 ; and excellent reversibility. Quantum chemical calculations, spectroscopic investigations, and thermogravimetric analysis indicate that the increased capacity is a result of stronger dynamic covalent bonds. The strong chemisorption of CO 2 is always accompanied by a high absorption enthalpy, and traditional methods to reduce the absorption enthalpy lead to decreased CO 2 capacities. Through the introduction of a large π-conjugated structure into the anion, a dual-tuning approach for the improvement of CO 2 capture by anion-functionalized ionic liquids (ILs) resulted in a high capacity of up to 0.96 mol and excellent reversibility. The increased capacity and improved desorption were supported by quantum chemical calculations, spectroscopic investigations, and thermogravimetric analysis. The increased capacity may be a result of the strengthened dynamic covalent bonds in these π-electron-conjugated structures through anion aggregation upon the uptake of CO 2 , and the improved desorption originates from the charge dispersion of interaction sites through the large π-electron delocalization. These results provide important insights into effective strategies for CO 2 capture.
研究领域:
化学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF PHYSICAL CHEMISTRY B
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2011
·
IF 3.603
Huan Liu,Zien Fu,Kai Xu,Hualun Cai,Xin Liu,Mingcai Chen
A study of the structure–property relationship of the highly π-conjugated Schiff-base moiety in polymerization of a liquid crystal (LC) diepoxide oligomer (PBMBA) and mesophases stabilization has been investigated. We first proposed two exothermic peaks distinctly observed in nonisothermal polymerization curves for thermal copolymerization of PBMBA monomer with a diamine comonomer that corresponded to two different reactions, namely, an epoxy-amine polymerization and anionic polymerization. For PBMBA, note that an unexpected homopolymerization accompanying an appearance of enantiotropic mesophase transitions had taken place in the absence of any initiators, evidencing the possibility of an anionic mechanism yielding a homopolymer. A novel Schiff-base model compound (SBM) was synthesized and used to induce the polymerization of different types of epoxies. Based on the structure–property relationship, we considered a specific role of highly π-conjugated Schiff-base moieties in the anionic polymerization of PBMBA and hoped the mesophases could be stabilized using this mechanism, which may provide a key strategy for design of the polymer-dispersed liquid crystal (PDLC) materials via a chemical process.
研究领域:
材料化学
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高分子科学
·
液晶材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Man Dong,Qingqing Pan,Fanfei Meng,Xiaohui Yao,Siqi You,Guogang Shan,Chunyi Sun,Xinlong Wang,Zhongmin Su
Sunlight-driven CO 2 reduction to value-added chemicals is an effective strategy to promote carbon recycling. The exploration of catalysts with efficient charge separation is crucially important for highly efficient CO 2 photoreduction. In this work, the preparation of metal-cluster-based covalent organic framework (CuABD) integrated features from both metal organic frameworks (MOFs) and covalent organic frameworks (COFs) through the condensation of diamines and functionalized trinuclear copper clusters demonstrate a thoughtful design strategy. The reported yield of 1.3 mmol g −1 h −1 for formic acid (HCOOH) under simulated solar irradiation is impressive, surpassing the performance of many COF- and MOF-based catalysts previously reported. Compared to its isomorphic metal-free structure (named BDFTD) and bare trinuclear Cu cluster which present extremely poor catalytic activities, CuABD displays remarkably enhanced CO 2 reduction activity. Experimental and theoretical investigations reveal that the efficient charge transfer between diamine monomer and cyclic trinuclear copper (I) units, and the electron delocalization of the π-conjugated framework are responsible for the appealing catalytic performance. In summary, the work presents a well-structured and scientifically sound exploration of a metal-cluster-based covalent organic framework for efficient CO 2 reduction under sunlight.
研究领域:
材料科学
·
环境科学
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催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DYES AND PIGMENTS
·
2017
·
IF 3.473
Liang-Wei Ma,Zu-Sheng Huang,Sheng Wang,Herbert Meier,Derong Cao
Three novel quinoxaline-based donor-π-acceptor type organic dyes were synthesized and explored as sensitizers in dye-sensitized solar cells (DSSCs). The impacts of various π-conjugation configurations which contain different quinoxaline derivatives on the absorption properties , electrochemical properties and photovoltaic performances , as well as theoretical calculations have been investigated systematically. The photovoltaic performances of these dyes were found to be highly relevant to the π-conjugated configurations. In particular, the DSSC based on the dye with 2,3-dioctylquinoxaline as the spacer exhibited the highest efficiency of 8.20% with a short-circuit photocurrent density of 17.83 mA cm −2 , an open-circuit photovoltage of 0.71 V, and a fill factor of 0.65, under standard global AM 1.5G solar light condition. However, the DSSC based on the dye with a more conjugated dithieno [2,3- a :3′,2′- c ]phenazine core as the spacer exhibited a lower efficiency due to serious intermolecular aggregation. When the intermolecular aggregation is inhibited, the efficiency can be improved greatly. The results confirm that the configuration of the π-conjugation of the dyes should be considered for the improvement of the photovoltaic performance.
研究领域:
材料科学
·
光伏技术
·
有机化学
✓ 已验证
DOI
高影响因子
Small
·
2024
·Vol. 20
·期 37
·2400549
·
IF 13
Yaoguo Shen,Mingliang Ding,Gang Chen,Yingjie Luo,Sangen Zhao,Junhua Luo
A large optical anisotropy is the most important parameter of birefringent crystals. Integrating π-conjugated groups with large polarizable anisotropy into target compounds is a common strategy for constructing brilliant birefringent crystals. However, the key problem is to enhance the density of the birefringence-active units and further arrange them parallelly. In this study, three novel birefringent crystals, C 9 H 7 NBrX (X = Cl, Br, NO 3 ), are successfully synthesized by introducing a new birefringence-active [C 9 H 7 NBr] + unit. Interestingly, these compounds feature similar layered structures but exhibit different optical anisotropies at 550 nm (0.277 for C 9 H 7 NBrCl, 0.328 for C 9 H 7 NBrBr, and 0.401 for C 9 H 7 NBrNO 3 ) owing to the different anions in them. Particularly, the small trigonal planar NO 3 anions perfectly fill the interstices of the π-conjugated [C 9 H 7 NBr] + groups with large optical anisotropy, with the resulting compound C 9 H 7 NBrNO 3 showing superior optical properties compared to the others. The above findings provide strategies for designing new optical materials with large birefringence by matching birefringence-active groups of different sizes. Additionally, a new theory for predicting and comparing the polarizability anisotropy of compounds is proposed, which would guide in exploring large birefringent crystals.
研究领域:
材料科学
·
光学
✓ 已验证
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）