JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Xiao-Lu Sun,Zan Liu,Zhi-Lin Cheng
The Cu-intercalated layered h-BN/N-doped carbon-nanofiber composite films (PAN-Cu/ABN-CNFs) were successfully prepared by the combination of the electrospinning technique and the one-pot carbonization process, using the mixed solution of polyacrylonitrile (PAN) and Cu-intercalated activated boron nitride (Cu/ABN) as carbon precursor. A series of characterizations proved that the PAN-Cu/ABN-CNFs possessed the distinguished merits in the structure and composition, such as the pore feature of the micropore (0.076 cm 3 /g)-mesoporous (0.3582 cm 3 /g) structure, the structure of the exfoliated h-BN nanosheets , the low-coordination high-content N (11.65 at%) and the existence of self-reducing Cu nanoparticles (0.5 at%). For adapting the actual application, the mechanical properties of the PAN-Cu/ABN-CNFs were comprehensively evaluated, showing that the PAN-Cu/ABN-CNFs films had the robust tensile strength and bending properties as well as the desirable wear resistance. Furthermore, the selective adsorption desulphurization of the PAN-Cu/ABN-CNFs were examined by the selective adsorption removal of thiophene (TH) from the simulated oil, indicating that the optimum adsorption capacity of the fresh films was up to 78.38 mg/g in 800 mg/L initial concentration and the adsorption capacity after the four-time regeneration recycling still approached 74.894 mg/g. Finally, the adsorption kinetics , isotherm and thermodynamic studies suggested that the adsorption behavior of TH over the PAN-Cu/ABN-CNFs should be better described by the correlation coefficients of Avrami fractional-order kinetics and Liu isotherm, while the thermodynamic studies showed a favorable exothermic and spontaneous adsorption mechanism.
✓ 已验证
产品关联
DOI
高影响因子
Additive Manufacturing
·
2021
·
IF 10.998
Yuchao Wu,Mingen Fei,Tingting Chen,Chao Li,Tengfei Fu,Renhui Qiu,Wendi Liu
Thermoplastic elastomers exhibit high softness, stretchability, recoverability, and reprocessibility, but their manufacture requires high cost and long processing time. Photocuring 3D printing is a remedial processing method as it enables rapid fabrication at room temperature. However, it is difficult to print thermoplastic elastomers by photocuring 3D printing because the generated linear polymers easily dissolve in liquid precursors during printing. Herein, stretchable, self-healing, and renewable palm oil (PO)-based elastomers were prepared from UV-responsive vinyl PO monomers via photocuring 3D printing. Fast solid-liquid separation was achieved via hydrogen bonds and Zn 2+ -ligand coordination (non-covalent crosslinking) to slow down the dissolution of crosslinked polymers in the monomer liquid . The non-covalent bonds endowed the elastomers with high tensile strength (~4.2 MPa) and elongation at break (~851%). Additionally, the elastomers are mainly prepared from biobased, renewable, and low-cost PO feedstocks . Most importantly, the dual dynamic crosslinked network resulted in superior stress relaxation, shape programming, and self-healing behavior of the elastomers. The method described may enhance the application scope of thermoplastic elastomers and 3D printing.
✓ 已验证
产品关联
DOI
高影响因子
Solar RRL
·
2021
·Vol. 5
·期 12
·2100559
·
IF 8.582
Hong-Hong Zhang,Zi-Chun Zhou,Yu-Jie Dong,Li Zhang,Hong-Yan Chen,Dai-Bin Kuang
Utilizing halide perovskites for photocatalytic aromatic C( sp 3 ) H bond activation remains a great challenge due to the serious recombination of photogenerated charge carriers and slow reaction dynamics of the materials themselves. Herein, a lead-free perovskite-based hybrid of Cs 3 Sb 2 Br 9 /g-C 3 N 4 nanosheet is constructed and applied for photocatalytic aromatic C( sp 3 ) H bond activation, which shows enhanced photocatalytic performance. By introducing ultrathin g-C 3 N 4 nanosheets as the heterogeneous nucleation sites, size-reduced and well-dispersed Cs 3 Sb 2 Br 9 nanocrystals can be obtained. The as-formed close contact and high-quality heterointerface between Cs 3 Sb 2 Br 9 and g-C 3 N 4 provides pathways for fast charge transfer which is beneficial to improve the separation efficiency of photogenerated electron−hole pairs. Under visible light irradiation, the Cs 3 Sb 2 Br 9 /g-C 3 N 4 hybrid photocatalyst can effectively oxidize toluene toward benzaldehyde and benzyl alcohol with a total conversion rate of 8346.8 μmol g −1 h −1 , which is 26.6- and 6.0-fold that of pure g-C 3 N 4 and Cs 3 Sb 2 Br 9 , respectively. This work demonstrates the potential of all-inorganic lead-free halide perovskite-based heterostructures for photocatalytic organic reactions.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 25
·15137-15144
·
IF 10.733
Lei Hu,Li Gao,Xiaoming Yan,Wenji Zheng,Yan Dai,Ce Hao,Xuemei Wu,Gaohong He
An advanced ion-selective membrane containing a dynamic hydroxyl-based 3D H-bond network is first proposed for improved efficiencies and stability in flow battery applications. The 3D H-bond network structure is constructed by the nanoscale aggregation of hydrophilic dense-hydroxyl side chains anchored to hydrophobic polybenzimidazole. This unique dynamic H-bond network creates proton transport highways as well as vanadium permeation barriers across the membrane, leading to an ultralow vanadium ion permeability (<10−9 cm2 s−1) and remarkably low area resistance (0.32 Ω cm−2). This membrane exhibits high coulombic efficiencies (CE: 98.0–99.2%) and energy efficiencies (EE: 88.9–77.9%) at high current densities (80–200 mA cm−2), together with a long lifetime of over 800 cycles (about 42 days) at 120 mA cm−2 in vanadium flow batteries. The design of dynamic 3D H-bond networks provides a promising strategy for the development of highly ion-selective and stable membranes for flow battery application.
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2019
·
IF 7.149
Xiao-Cheng Liu,Wen-Qiang Li,Yi-Ran Wang,Guan-Nan Zhou,Yi-Xuan Wang,Chuan-Shu He,Gong-Ming Wang,Yang Mu
Promotion of iron solubility using ligands is the preliminary step in the homogeneous electro-Fenton (EF) process at a mild pH, but the chelate efficiencies of most organic ligands are unsatisfactory, resulting in insufficient Fe(II) availability. In this study, atomic H* was, for the first time, introduced to the EF process to accelerate the regeneration of the Fe(II)-complex at a mild pH using a Ni-deposited carbon felt (Ni-CF) cathode. The introduction of atomic H* significantly elevated total organic carbon (TOC) abatement of ciprofloxacin (CIP) from 42% (CF) to 81% (Ni-CF) at a natural pH. In the presence of humic acids (HAs), atomic H* introduced via Ni-CF enhanced the CIP degradation rate to 10 times that of the CF at a mild pH. The electron spin resonance (ESR), density functional theory (DFT) calculations, electrochemical characterization, and in situ electrochemical Raman study clearly demonstrated that the atomic H* generated from the Ni-CF cathode was highly efficient at reducing Fe(III)-complexes at a natural pH. Additionally, the Ni-CF could generate atomic H* without significant nickel leaching. Thus, the atomic H* could continuously facilitate iron cycling and, consequently, enhance pollutant mineralization via the homogeneous EF process at a mild pH in an environmentally friendly manner.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CATALYSIS
·
2019
·
IF 7.723
Xiaoyue Wan,Qi Zhang,Mingming Zhu,Yi Zhao,Yongmei Liu,Chunmei Zhou,Yanhui Yang,Yong Cao
Site-selective deoxygenation of hydroxyl groups represents essential processes to access valuable functionalized bio-based compounds with industrial potential. One of the challenging tasks in this context is to convert biodiesel-derived glycerol in the presence of abundant water directly to 1,3-propanediol (1,3-PDO), a key component of the emerging polymer industry. Herein, a monometallic iridium supported on H-ZSM-5 in the absence of Re oxophilic metal oxides was prepared via grinding-assisted impregnation procedures and attempted as an effective and recyclable catalyst for the aqueous-phase selective hydrogenolysis of glycerol toward 1,3-PDO in the absence of acid additives. The results revealed the necessity to control the Ir domain dispersions, Ir 0 /Ir 3+ ratio and the amounts of overall acid/Brönsted acid sites. Activity depended linearly on the amount of overall and Brönsted acid sites, and 1,3-PDO selectivity increased in the presence of Ir-induced Brönsted acid sites, denoted as Ir-O(H)-H-ZSM-5. We speculate that Ir-O(H)-H-ZSM-5 are generated by the interfacial synergistic interaction between IrO x and H-ZSM-5 through hydrogen spillover and reverse hydrogen spillover according to the reported literatures. The reaction mechanism to elucidate the role of Ir-O(H)-H-ZSM-5 sites in glycerol hydrogenolysis was also postulated based on extensive characterization and catalytic reaction results.
✓ 已验证
产品关联
DOI
高影响因子
ORGANIC & BIOMOLECULAR CHEMISTRY
·
2014
·Vol. 12
·期 18
·2969-2978
·
IF 3.487
Jiajun Zhang,Pinhua Li,Lei Wang
A novel KOAc-promoted α-position C–H activation and alkynylation of ethers with alkynyl bromides to 2-alkynyl ethers has been developed under transition-metal-free and simple reaction conditions. In addition, this methodology can also be extended to the vinylation of ethers with vinyl bromides in excellent regio- and stereo-selectivity. A wide range of direct C(sp)–C(sp3) and C(sp2)–C(sp3) bonds has been formed through this protocol, which offers a new and alternative route.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ORGANIC & BIOMOLECULAR CHEMISTRY
·
2014
·Vol. 12
·期 21
·3493-3498
·
IF 3.487
Yaping Zhao,Lu Sun,Tieqiang Zeng,Jiayi Wang,Yanqing Peng,Gonghua Song
Copper-catalyzed direct olefination of benzaldehydes into 1,3-diarylpropenes by a novel domino Knoevenagel-decarboxylation-Csp3-H activation sequence is reported. This method provides a concise and effective route toward the synthesis of unsymmetrical 1,3-diarylpropene derivatives.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2015
·
IF 4.321
Lei Yue,Guangqian Li,Guijin He,Yongsheng Guo,Li Xu,Wenjun Fang
The precise investigations on modeling properties and performance of practical fuels are usually complicated because of the multi-component nature. On the basis of hydrogen to carbon ratio (H/C), as a simple and overall characterization parameter for hydrocarbon fuels, this work provides a comprehensive insight into the study of kerosene-based hydrocarbon fuels (H/C = 1.6–2.3). The fundamental properties and supercritical cracking performance of hydrocarbon fuels are influenced intrinsically by their H/C values and molecular weights ( M ) due to the compositional and structural effects. Thus, a new combined parameter, (H/C)/ M a , is proposed to model the performance of hydrocarbon fuels. It is found that the hydrocarbon fuel with a higher H/C has a higher net heating value, and that with a higher (H/C)/ M 0.1 has a lower density. The viscosity decreases with the increase of (H/C)/ M 0.5 . The flash point shows a decreasing trend against the increase of (H/C)/ M 2 . The densities, viscosities and net heating values of 23 hydrocarbon fuels are calculated by means of the regression equations with the H/C and M data, and they are in agreement with the corresponding experimental values with the relative errors less than 2.5%, 10% and 1.5%, respectively. As investigated in an electrically heated tube reactor, the hydrocarbon fuel with a higher H/C performs thermal cracking more easily, absorb more heat and form fewer cokes. As a result, the cracking performance of hydrocarbon fuels can be predicted reasonably to a certain extent on the basis of H/C values.
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2017
·Vol. 22
·期 7
·1068
·
IF 2.861
Yalu Dong,Panpan Peng,Baoping Hu,Hui Su,Shenghua Li,Siping Pang
High-energy metal–organic frameworks (MOFs) based on nitrogen-rich ligands are an emerging class of explosives, and density is one of the positive factors that can influence the performance of energetic materials. Thus, it is important to design and synthesize high-density energetic MOFs. In the present work, hydrothermal reactions of Cu(II) with the rigid polynitro heterocyclic ligands 5,5′-dinitro-2H,2′H-3,3′-bi-1,2,4-triazole (DNBT) and 5,5′-dinitro-3,3′-bis-1,2,4-triazole-1-diol (DNBTO) gave two high-density MOFs: [Cu(DNBT)(ATRZ)3]n(1) and [Cu(DNBTO)(ATRZ)2(H2O)2]n(2), where ATRZ represents 4,4′-azo-1,2,4-triazole. The structures were characterized by infrared spectroscopy, elemental analysis, ultraviolet-visible (UV) absorption spectroscopy and single-crystal X-ray diffraction. Their thermal stabilities were also determined by thermogravimetric/differential scanning calorimetry analysis (TG/DSC). The results revealed that complex1has a two-dimensional porous framework that possesses the most stable chair conformations (like cyclohexane), whereas complex2has a one-dimensional polymeric structure. Compared with previously reported MOFs based on copper ions, the complexes have higher density (ρ = 1.93 g cm−3for complex1and ρ = 1.96 g cm−3for complex2) and high thermal stability (decomposition temperatures of 323 °C for complex1and 333.3 °C for complex2), especially because of the introduction of an N–O bond in complex2. We anticipate that these two complexes would be potential high-energy density materials.Keywords:energetic materials;metal organic frameworks;densities;polynitro heterocyclic ligands
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2016
·
IF 2.758
Fengrui Zhai,Shuang Li,Jialin Sun,Zhongzhou Yi
h -BN-SiC ceramic composites with different SiC contents were fabricated by spark plasma sintering . The results indicate that the addition of hard SiC particles has a remarkable effect on the densification, microstructure, mechanical properties and thermal shock resistance of the composites. Compared with pure h -BN ceramic, the relative density and mechanical properties of h -BN-SiC ceramic composites were improved obviously. The optimal properties of h -BN-SiC ceramic composites were obtained at SiC content of 25%, and the relative density, flexural strength and fracture toughness reached 97.8%, 289.2 MPa and 3.45 MPa m 1/2 , respectively. Moreover, the relationship of fracture toughness and fracture mode was discussed. The thermal shock test results showed that the h -BN-SiC ceramic composite with the SiC content of 25% exhibited excellent thermal shock resistance, presenting critical temperature difference up to 900 °C. The high temperature oxidation of h -BN and SiC on material surface led to the formation of borosilicate glass phase, which could heal the surface microcracks and then improve the thermal shock resistance.
✓ 已验证
产品关联
DOI
高影响因子
CEMENT AND CONCRETE RESEARCH
·
2024
·
IF 10.9
Binmeng Chen,Xu Fang,Yuyang Zhao,Zongjin Li
In recycling and reusing construction waste, carbonation of recycled concrete fine (RCF) has been successfully applied to produce value-added products, such as silica nanoparticles, via the breaking of calcium silicate hydrate (C-S-H) structure and condensation of silicate chains. However, the intricacies of carbonation of RCF with varying calcium to silicon (C/S) ratios and their implications on the size of generated silica nanoparticles remain unknown. In this work, we developed an optimized carbonation method at high water to solid ratio to fabricate silica nanoparticles from C-S-H with different C/S ratios. The particle size of silica nanoparticles was found to gradually decrease with the increased C/S ratio of C-S-H. Since as C/S ratio increased, silicate in Q 3 state shifted to Q 1 state and the silicate chain became shorter, shifting from long-range, disordered to short-range, ordered. As the disordered self-seeding growth of long silicate chains derived from C-S-H continued, the Si-O-Si network of silica nanoparticles became chaotic, leaving more unreacted Si-OH on its surface. On the contrary, the short silicate chains displayed higher possibility of condensation, making nanoparticles with a smaller diameter.
✓ 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）