INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2026
·
IF 9.2
Qingsong Liu,Yan Zhu,Wentao Li,Junci Wu,Yi Zhang,Shouchun Ma,Chuanli Qin
Modified graphitic carbon nitride (MCN) was synthesized via calcinating β-alanine introduced melamine supramolecular precursors and poly(3-methylthiophene-co-fluorene) (P(3MT-co-F)) with improved planarity was prepared by polymerization of 3-methylthiophene (3MT) and fluorene (F) monomers. P(3MT-co-F)/MCN heterojunction was constructed by electrostatic self-assembly and the optimal 3P(3MT 1 -co-F 1 )/MCN exhibits excellent H 2 production performance of 11108 μmol h −1 g −1 under visible light, 150 times higher than MCN. The enhancement is attributed to the following aspects: First, F monomer as a rigid unit can regulate the main-chain torsion of P(3MT-co-F), enhancing planarity and facilitating intramolecular charge transport within copolymer. Second, N⋯S interactions and π-π stacking interactions at heterojunction interface improve the charge transfer and separation. Third, the incorporation of P(3MT-co-F) with narrow band gap into MCN not only broadens visible light absorption range and enhances visible light response, but also forms a Z-scheme heterojunction with MCN, further enhancing the charge separation and retaining the electrons with strong reducibility.
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Polymers
·
2023
·Vol. 15
·期 8
·1856
·
IF 5
Wen Wang,Jie Cao,Jiawen Yu,Fajuan Tian,Xiaoyu Luo,Yiting Hao,Jiyan Huang,Fucheng Wang,Weiqiang Zhou,Jingkun Xu,Ximei Liu,Hanjun Yang
Supercapacitors are widely used in various fields due to their high power density, fast charging and discharging speeds, and long service life. However, with the increasing demand for flexible electronics, integrated supercapacitors in devices are also facing more challenges, such as extensibility, bending stability, and operability. Despite many reports on stretchable supercapacitors, challenges still exist in their preparation process, which involves multiple steps. Therefore, we prepared stretchable conducting polymer electrodes by depositing thiophene and 3-methylthiophene on patterned 304 stainless steel (SS 304) through electropolymerization. The cycling stability of the prepared stretchable electrodes could be further improved by protecting them with poly(vinyl alcohol)/sulfuric acid (PVA/H2SO4) gel electrolyte. Specifically, the mechanical stability of the polythiophene (PTh) electrode was improved by 2.5%, and the stability of the poly(3-methylthiophene (P3MeT) electrode was improved by 7.0%. As a result, the assembled flexible supercapacitors maintained 93% of their stability even after 10,000 cycles of strain at 100%, which indicates potential applications in flexible electronics.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Biao Ma,Bin Li,Yang Li,Xiaobin Fan,Fengbao Zhang,Guoliang Zhang,Yuanzhi Zhu,Wenchao Peng
In this study, a facile atmospheric pressure chemical vapor deposition (CVD) method is used for the synthesis of nitrogen and sulfur co-doped hollow carbon sphere (NSC). Nano-CaCO 3 is used as template for the formation of hollow and highly hierarchical porous carbon structure. The doped percentages of N and S can be easily regulated by changing the ratio of N and S precursors and the deposition temperature. The obtained NSC is highly active for the catalytic oxidation of organic pollutants with peroxymonosulfate (PMS) as oxidant, and the reaction rate constant is 4.5 and 32.7 times faster than the single N or S doped samples, respectively. The PMS activation mechanism is comprehensively investigated by electron paramagnetic resonance (EPR) and radical quenching tests. Superoxide intermediate (O 2 •− ) and singlet oxygen ( 1 O 2 ) play the dominant role for phenol degradation. Moreover, with the introduction of secondary doped S atoms, more O 2 •− are generated for organics degradation. The excellent catalytic activity of NSC should be resulted from the optimized N and S doping percentages and large specific surface area (SSA). The synthesis strategy in this study provides a facile and low-cost synthetic method for heteroatom doped carbon materials and would expand the application of metal-free materials in the environmental remediation field.
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AICHE JOURNAL
·
2021
·Vol. 67
·期 5
·e17153
·
IF 3.993
Yuhao Zhang,Liang Zhao,Feng Chen,Yongtao Wang,Jinsen Gao,Liyuan Cao,Hui Wang,Chunming Xu
The fluid catalytic cracking (FCC) naphtha critical component-oriented separation process is an efficient method to produce ultra-low-sulfur (<10 μg/g) gasoline with minimal loss of octane number (<1 RON). However, the product quality is highly dependent on the structure of the components of FCC naphtha. Aromatics and thiophene sulfides without a methyl side chain favor the separation of olefin. The major impulse of olefin separation is the solvent-induced dipole of aromatics or thiophene sulfides, leading to a “Plane-to-Plane” combination between the solvent and aromatics or thiophene sulfides, accompanied by a steric hindrance due to their side chains. This condition resulted in 2–3 times greater θ of benzene and thiophene compared with that of toluene and 3-methylthiophene. In addition, an improved non-random two-liquid model was proposed based on the above results, and a simulation method for FCC naphtha solvent extraction process was established. The calculation results accorded well with industry data.
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JOURNAL OF MOLECULAR LIQUIDS
·
2020
·
IF 5.065
Hong Li,Yuhao Zhang,Liang Zhao,Dexin Sun,Jinsen Gao,Chunming Xu
Separation of sulfides from fluid catalytic cracking (FCC) naphtha is of great significance for environmental protection. In this work, the organic solvents N -methyl-2-pyrrolidone (NMP), sulfolane (SUL), and their mixtures were selected to extract sulfides (3-methylthiophene) from model FCC naphtha (n-heptane). Correspondingly, the liquid-liquid phase equilibrium (LLE) data of the systems n-heptane +3-methylthiophene + SUL/NMP/(NMP + SUL) were experimentally obtained at 298.15 K and 101.3 kPa. The distribution coefficient and separation factor were calculated to assess the extraction performance of the solvents. The results showed that mixed solvent (NMP + SUL) could be used as a potential solvent to extract 3-methylthiophene due to its suitable selectivity and solubility. Meanwhile, the density functional theory (DFT) method was applied to explore the extraction mechanism of 3-methylthiophene from n-heptane by NMP or SUL. Electrostatic potential (ESP) analysis, interaction energies, and reduced density gradient (RDG) analysis showed that the main interactions between NMP/SUL and 3-methylthiophene were van der Waals and weak hydrogen bond forces. In addition, the LLE data were correlated by the NRTL and UNIQUAC thermodynamic models with the RMSD values were all <0.30%. Also, the binary interaction parameters were regressed which could be applied for the optimization and design of the separation process.
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ACS Applied Polymer Materials
·
2021
·
IF 4.089
Hao Zhan,Jiajun Chen,Chi Zhang,Jincheng Zhang,Li-Juan Fan
Incorporating conjugated polymers with functionalities to provide good adhesion to solid substrates is favorable to prepare fluorescent solid materials for various applications. Inspired by the wide range and robust adhesion property of mussel, a series of conjugated polymers with the poly[p-(phenylene ethynylene)-alt-(thienylene ethynylene)] backbone and pendant catechol groups via Sonogashira coupling polymerization were designed and synthesized. The contents of catechol groups were precisely tuned through copolymerization, followed by selective deprotection. For comparison, similar polymers with pendant phenol groups were also synthesized. The conjugated polymers were demonstrated to have expected chemical structures via systematic characterizations. All the polymers had good solubility in common organic solvents and displayed strong fluorescence in solution. To evaluate the adhesion performance of different polymers, fluorescent silica microspheres were selected as the substrate for loading the abovementioned polymers via immersing the silica microspheres into solutions of conjugated polymers. To find out the loading amount, a calibration curve for each polymer was set up based on the linear relationship between the fluorescence intensities of the suspension of microspheres and the polymer concentrations. The loading amounts of catechol-functionalized polymers were significantly higher than those of phenol-functionalized polymers; the highest loading amount is over 14-fold of the amount of the control polymer without any catechol/phenol functionality. By combining the abovementioned results with the preliminary mechanism investigation based on the solvent washing, it was concluded that catechol functionality and its content in the polymers greatly affected the adhesion performance. The multidentate interaction provided by catechol groups may enable the conjugated polymers to be widely used for fluorescence coating and staining of a variety of substrates.
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ENERGY & FUELS
·
2019
·
IF 3.021
Songjie Hua,Yuqi Hu,Liang Zhao,Liyuan Cao,Xiaoqin Wang,Jinsen Gao,Chunming Xu
For the effective removal of thiophene, a novel surface molecularly imprinted polymer (SMIP/MA@PCNS) was fabricated using porous carbon nanospheres (PCNS-5) as the support matrix and maleic acid (MA) as the functional monomer. Benefiting from the special amphiphilic properties of β-cyclodextrin as the carbon source, PCNS-5 exhibited good dispersion, uniform nanoscale sphere, and high specific surface area, which favored the rapid adsorption rate. Based on the intermolecular hydrogen bonds existing between carboxylic acid functional groups and thiophene, adsorption performances of different unsaturated polycarboxylic acids were investigated systematically. The results revealed that the optimal functional monomer was MA instead of the conventional methacrylic acid. Accordingly, SMIP/MA@PCNS was successfully applied to the direct removal of thiophene in the oil, reaching remarkable sulfur adsorption capacity (22.6 mg S g–1) within 120 min. Moreover, SMIP/MA@PCNS could selectively remove thiophene (16.2 mg S g–1) in the presence of structural analogues (3-methylthiophene, benzene, and cyclopentane) and exhibited an excellent regenerability with nice structural ability. These results indicated that SMIP/MA@PCNS possessed great promise in the desulfurization field.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Yuhao Zhang,Hui Wang,Liang Zhao,Jinsen Gao,Chunming Xu
The performance of dimethyl sulfoxide (DMSO) solvent in separating olefins from aromatics and thiophene sulfides was evaluated through a series of ternary liquid-liquid equilibrium (LLE) experiments at 101.325 kPa and 303.15 K. The influences of the structures of olefins, aromatics, and thiophene sulfides on the separation efficiency were analyzed. Normal 1-hexene and isomer 2,4,4-trimethyl-1-pentene were easily separated from aromatics or thiophene sulfides, which only contain aromatic ring structures, such as benzene and thiophene. The reason is that the induced dipole on the aromatic ring structure introduced by the DMSO solvent significantly improved the polarity of aromatics and thiophene sulfide molecules, thereby enhancing the interaction with the ring structure. In addition, olefins were easier to separate from thiophene sulfides than from aromatics. The olefin separation factor of separating 2,4,4-trimethyl-1-pentene from thiophene was three times greater than that of separating the same olefin from benzene. The binary parameters between DMSO and olefins, aromatics, and thiophene sulfides for NRTL and UNIQUAC models were obtained through ternary LLE experiments. The maximum value of the root-mean-square deviation of the simulated compositions of phases compared with experimental data was 0.0052 in the two adopted models. Hence, the regressed binary parameters could efficiently describe the experimental LLE process. On the basis of the obtained binary parameters, the NRTL and UNIQUAC models are suitable for predicting the performance of olefin separation from fluid catalytic cracking naphtha. However, the NRTL model is more precise than the UNIQUAC model.
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RSC Advances
·
2018
·Vol. 8
·期 71
·41003-41011
·
IF 2.936
Wen Bing Wu,Sun Xue,Jian Hua Chen,Xiao Li
Membrane separation technologies have great promising potential for applications in several industries. Metal–organic frameworks (MOFs), for their large surface areas, low framework densities, transition-metal ions in the skeleton and high pore volumes relative to other porous matrices, have great potential for the removal of sulfur from gasoline with high efficiency. In the present study, a novel porous membrane adsorbent MIL-101(Cr)/SA was prepared by immobilizing MIL-101(Cr) onto sodium alginate (SA) matrix, which can combine the size/shape selectivity of MIL-101(Cr) with the processability and mechanical stability of SA polymer. The physico-chemical properties of MIL-101(Cr)/SA were investigated by FT-IR, SEM, BET, XRD and EDX methods. To investigate the effects of some important factors on the adsorption behavior for thiophene, a batch of experiments were performed by changing the concentration of porogen polyethylene glycol in the MIL-101(Cr)/SA, solution temperature, initial thiophene concentration and contact time. Meanwhile, benzothiophene, thiophene and 3-methyl thiophene were used to test the selectivity of MIL-101(Cr)/SA. The MIL-101(Cr)/SA showed an excellent uptake capacity of 671 mg g−1 under the optimal adsorption conditions. Selectivity testing indicated that the uptake capacity of MIL-101(Cr)/SA follows the order of benzothiophene > thiophene > 3-methyl thiophene. Kinetics experiments indicated the pseudo-second-order model displayed good correlation with adsorption kinetics data. The Crank model showed that the intraparticle solute diffusion is the rate-controlling adsorption step. Regeneration experiment result shows that the prepared MIL-101(Cr)/SA has excellent adsorption and desorption efficiencies.
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高影响因子
RSC Advances
·
2014
·Vol. 4
·期 107
·62096-62104
·
IF 3.708
Junjie Li,Lei Wang,Xiaole Jia,Xiongzhi Xiang,Cheuk-Lam Ho,Wai-Yeung Wong,Hua Li
Polymer–inorganic composites show great potential for use as thermoelectric (TE) materials. However, the TE performance of these materials needs to be improved. One way to improve the TE performance would be to synthesize novel conductive polymers with high Seebeck coefficients to prepare polymer–inorganic TE composites. In this study, acidized and ammoniated forms of poly[(3-methylthiophene-2,5-diyl)(diphenylaminobenzylidene)(3-methylthiophene quinodimethane-2,5-diyl)] (PMTDPABQ) were successfully synthesized with high Seebeck coefficients. These polymers were used to prepare a series of PMTDPABQ/graphite (G) bulk composites by mechanical ball milling and cold pressing. The morphology, thermal stability, and TE performance of these composites were evaluated. The G was uniformly dispersed in the polymer matrix, and the composite materials exhibited good thermal stability at temperatures up to 200 °C. The acidized PMTDPABQ/G composites exhibited better TE performance than the ammoniated PMTDPABQ/G composites. The highest TE figure of merit, ZT = 5.32 × 10−3, was obtained using acidized PMTDPABQ/G and was approximately 3 times greater than that of polythiophene (PTh)/G (1.37 × 10−3).
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ACS Applied Materials & Interfaces
·
2014
·
IF 5.9
Lianyi Xu,Qiang Ye,Xuemin Lu,Qinghua Lu
An electro-responsively reversible switching of wettability between superhydrophobicity and superhydrophilicity has been obtained from a highly porous structured polythiophene film. The polythiophene film was prepared by two-step electrochemical deposition on an indium tin oxide (ITO) substrate. The underlying poly(3,4-ethylenedioxythiophene) (PEDOT) provides a highly porous structured conductive support, and poly(3-methylthiophene) (P(3-MTH)) deposited thereon plays the role of a low-surface-energy conductive coating. The wettability switching of this double-layer film between superhydrophobicity and superhydrophilicity has been investigated by doping and dedoping in an electrolyte solution containing ClO4–. Electrochromism of the film was also seen to accompany the electrochemical process of conversion between the two superwetting states. On the basis of this porous electro-active film, an in situ electro-wetting device was also demonstrated.
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高影响因子
POLYMER COMPOSITES
·
2013
·Vol. 34
·期 11
·1801-1808
·
IF 1.482
Jie Zhao,Yu Xie,Zhanggao Le,Yan Luo,Yunhua Gao,Rong Zhong,Yuancheng Qin,Jianfei Pan,Yan Huang
The BaFe 12 O 19 /multiwall carbon nanotubes/poly(3-methyl-thiophene) (BaFe 12 O 19 /MCNTs/P(3MT)) composites were synthesized through an in situ chemical polymerization of 3-methyl-thiophene (3MT) in the presence of BaFe 12 O 19 /MCNTs composite powders. The BaFe 12 O 19 /MCNTs/P(3MT) composites were characterized by the fourier transform infrared spectrometry (FTIR) and X-ray diffraction (XRD). The morphologies of the composites were observed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The electric conductive properties were tested by a four-probe conductivity tester and the magnetic properties were measured by vibrating sample magnetometer (VSM). The electromagnetic performance tests showed that when the mass ratio of BaFe 12 O 19 to MCNTs was 0.4, and the BaFe 12 O 19 /MCNTs to P(3MT) was 0.15, the conductivity, saturation magnetization ( M s ) and residual magnetization ( M r ) of the BaFe 12 O 19 /MCNTs/P(3MT) composites achieved 166.740 S/m, 29.884 emu/g, and 17.581 emu/g, respectively. POLYM. COMPOS., 34:1801–1808, 2013. © 2013 Society of Plastics Engineers
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危险品化学品经营许可证（带存储）