NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 44
·21065-21077
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IF 3.925
Zhenlu Liu,Jing Xu,Jiandong Wu,Ye Liu,Lijun Ma,Linying Hu
Photocatalysis is one of the most promising methods to solve the problems of solar energy conversion and sustainable fuel production. Among them, the semiconductor electronic transition to produce hydrogen is the most critical research topic in the field of photocatalysis. ZnS and Ag2Mo2O7 monomers were prepared by the hydrothermal method. The S-scheme heterojunction was formed by electrostatic adsorption of the two materials. The S-scheme heterojunction can improve the separation rate of photogenerated carriers through the built-in electric field so that the hydrogen production rate of the system can reach a maximum of 871.9 μmol g−1 h−1. The system showed a good photoelectric response according to UV-Vis DRS and electrochemistry studies and excellent hydrogen evolution performance. In this study a DFT simulation of the heterojunction interface formed by the system was also carried out, and the relative size of the surface work function indicated the transfer direction and path of electrons.
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高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2022
·
IF 3.898
Sihan Huang,Yaohan Chen,Xue Wang,Jing Guo,Yonggang Li,Lei Dai,Shenghai Li,Suobo Zhang
The past few decades have witnessed rapid gains in our demands of antifouling membranes such as water purification membranes and hemodialysis membranes. A variety of methodologies have been proposed for improving the antifouling performance and the hemocompatibility of the membranes. In this study, a series of copolymers (PSF-PESSB) containing polysulfone (PSF) and poly(arylene ether sulfone) bearing pendant zwitterionic sulfobetaine groups (PESSB) were prepared via one-pot polycondensation . Subsequently, the ultrafiltration (UF) membranes were prepared from different zwitterion-containing copolymers. The prepared membranes showed high thermal stability and mechanical properties. Besides, it also displayed attractive antifouling performance and blood compatibility. Compared with the original PSF membrane, the amount of protein absorption on the modified membrane was reduced; the flux recovery ratio and the resistance to blood cells were significantly improved. The results of this work suggest that PSF-PESSB membranes are expected to be applied in blood purification. The introduction of zwitterion-containing polymers to membranes paves ways for developing advanced hemodialysis technologies for crucial process.
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POLYMERS FOR ADVANCED TECHNOLOGIES
·
2022
·Vol. 33
·期 10
·3490-3500
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IF 3.348
Wu Zhang,Weikang Xia,Yasheng Shi,Changlin Zhou,Ran Chen,Lei Wang,Jinqing Qu
Flame-retarded epoxy thermosets are highly desirable for electronics-related basic materials in the new-generation information applications. Herein, a DOPO-anchored benzothiadiazole flame retardant, namely DOPO-BTD , is designed and synthesized for P/N/S synergistic flame-retarded epoxy thermosets. DOPO-BTD possesses good thermal stability and excellent compatibility with the epoxy matrix. As reflected by UL 94 test, the DOPO-BTD coated EP passes the V0 rating and achieves a higher LOI value of 34.6% at ultralow P content of 0.39 wt%. The investigation of the DOPO-BTD -triggered P/N/S synergistic flame-retarded effect by thermal images further validated the flame retarded efficacy and dramatic inhibition of the flame. Meanwhile, the incorporation of 4.8 wt% DOPO-BTD into the epoxy matrix, the PHRR, THR, SPR, TSP, and COP are significantly decreased by 37.97%, 27.44%, 25.49%, 19.83%, and 31.70%, respectively. Additionally, the fire growth index (FGI) is sharply dropped 26.06%. Moreover, the TGIR and TGMS results convince the flame-retarded mechanism of DOPO-BTD through the combination of the gas-phase and condensed-phase pathways. The P/N/S synergistic DOPO-BTD can serve as a promising flame retardant for efficiently fabricating the flame-retarded epoxy thermosets, and this study sheds light on the development of multiple elements synergistic flame-retardants for functional polymers with great application potential.
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Advanced Materials Interfaces
·
2022
·Vol. 9
·期 26
·2201049
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IF 6.389
Yun Zhao,Qianqian Bai,Liqiang Chai,Xiaofei Dong,Jiangtao Chen,Jianbiao Chen,Yan Li,Xiuxun Han
Aiming at the current bottleneck of Cu 2 ZnSn(S,Se) 4 (CZTSSe) thin film solar cells, an experimental analysis of the performance and loss mechanism of CZTSSe thin film solar cells upon proton radiation exposure is presented. In order to deduce the important cell parameters, the environment of the cells is simulated by subjecting the devices to 200 keV proton irradiation with fluences from 1 × 10 10 to 1 × 10 17 cm -2 . It is found that the damage constants are sensitive to the elemental diffusion at heterojunction and Na redistribution in device. The incidence of the proton can lead to bandgap, tails fluctuations, and Urbach energy changes in the cells those directly impact defects and structural disorder in CZTSSe material thereby the device performance. The time-resolved photoluminescence results show that the carrier lifetime is also very sensitive to the distribution of interface elements, especially Na, Cd, and S. These findings may provide new ideas for solving the V OC deficit of CZTSSe solar cells. From this work, it can be also suggested that the CZTSSe thin film solar cells are robust to proton irradiation and have the potential for future space applications.
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INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
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2022
·Vol. 23
·期 16
·8967
·
IF 6.208
Lesly Dasilva Wandji Djouonkep,Alain Pierre Tchameni,Naomie Beolle Songwe Selabi,Arnaud Kamdem Tamo,Ingo Doench,Zhengzai Cheng,Mario Gauthier,Binqiang Xie,Anayancy Osorio-Madrazo
Vanillin, as a promising aromatic aldehyde, possesses worthy structural and bioactive properties useful in the design of novel sustainable polymeric materials. Its versatility and structural similarity to terephthalic acid (TPA) can lead to materials with properties similar to conventional poly(ethylene terephthalate) (PET). In this perspective, a symmetrical dimethylated dialkoxydivanillic diester monomer (DEMV) derived from vanillin was synthesized via a direct-coupling method. Then, a series of poly(ether-ester)s were synthesized via melt-polymerization incorporating mixtures of phenyl/phenyloxy diols (with hydroxyl side-chains in the 1,2-, 1,3- and 1,4-positions) and a cyclic diol, 1,4-cyclohexanedimethanol (CHDM). The polymers obtained had high molecular weights (Mw= 5.3–7.9 × 104g.mol−1) and polydispersity index (Đ) values of 1.54–2.88. Thermal analysis showed the polymers are semi-crystalline materials with melting temperatures of 204–240 °C, and tunable glass transition temperatures (Tg) of 98–120 °C. Their 5% decomposition temperature (Td,5%) varied from 430–315 °C, which endows the polymers with a broad processing window, owing to their rigid phenyl rings and trans-CHDM groups. These poly(ether-ester)s displayed remarkable impact strength and satisfactory gas barrier properties, due to the insertion of the cyclic alkyl chain moieties. Ultimately, the synergistic influence of the ester and ether bonds provided better control over the behavior and mechanism of in vitro degradation under passive and enzymatic incubation for 90 days. Regarding the morphology, scanning electron microscopy (SEM) imaging confirmed considerable surface degradation in the polymer matrices of both polymer series, with weight losses reaching up to 35% in enzymatic degradation, which demonstrates the significant influence of ether bonds for biodegradation.Keywords:bio-based poly(ether-ester)s;mechanical properties;gas barrier properties;(bio)degradation
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PubMed
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2022
·
IF 4.889
Zhufeng Hu,Yinxiang Xu,Wenchao Xiang,Xiaodong Guo,Yuchen Tong,Junbo Xu,Chao Yang
The oxygen evolution reaction (OER) is the key to prepare electrocatalysts for water splitting. Heteroatom doping is an effective way to improve the catalytic performance of OER by modulating the local electronic environment and stimulating the synergy. However, the complicated manufacturing methods have hindered their practical application. Herein, we demonstrate a method based on FeOOH/CC precursor to realize the preparation of Ni-P-S@FeOOH/CC catalyst through fast electrodeposition method. The overpotential of Ni-P-S@FeOOH/CC catalyst is 210 mV (10 mA cm −2 ), and still has an initial voltage of 97.35 % for 48 h. The surface area analysis shows a higher electrochemically active surface area for the amorphous structure prepared by electrodeposition method. XPS and DFT results show that the co-doping of P and S can stimulate the synergistic effect and the minimum energy of adsorption/desorption in OER process is only 0.83 eV. The strategy shows good prospects for preparing efficient OER pre-catalysts.
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EUROPEAN POLYMER JOURNAL
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2022
·
IF 5.546
Bingxiu Xue,Fang He,Xiaopeng Zhao,Jianbo Yin
By changing the amount of vinylimidazole grafted on phenyl ring, we designed and prepared a series of topological self-crosslinked poly(ionic liquid)s (TS-PILs) with different number of spacer arms by free radical polymerization. The influences of the number of spacer arms on the electrorheological (ER) effect of TS-PILs in insulating carrier liquid were studied by rheological test under electric stimulus and the influence mechanism was analyzed by broadband dielectric spectroscopy. It was found that the ER effect of TS-PILs containing organic counterion bis(trifluoromethane sulfonylimide) (TFSI - ) increased with the increase of the number of spacer arms. Broadband dielectric spectra analysis showed that the increased ER effect with the number of spacer arms was attributed to the increase of interfacial polarization strength and the decrease of electrode polarization with the number of spacer arms. Activation energy analysis indicated that increasing the number of spacer arms could promote ion pair dissociation and ion number density but inhibit long-range movement of ions, which was responsible for the increase of interfacial polarization strength and the decrease of electrode polarization. The results provided a guidance insight for the design and preparation of high-performance crosslinked PIL-based ER materials.
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MACROMOLECULES
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2022
·
IF 6.057
Jinfeng Shi,Zhengyang Liu,Na Zhao,Shaofeng Liu,Zhibo Li
Precise synthesis of well-defined functional polysiloxanes on demand was challenging due to chain transfer and backbiting side reactions during ring-opening polymerization (ROP) of cyclosiloxane monomers. In this contribution, a trisphosphazene base (C3N3-Me-P3) with medium basicity and bulky molecular size was demonstrated as an effective organocatalyst to realize the controlled ROP of hexamethylcyclotrisiloxane (D3). Linear poly(dimethylsiloxane)s (PDMSs) with different end-groups were successfully synthesized by C3N3-Me-P3-catalyzed ROP and the subsequent end-capping of the propagating polysiloxanes using diverse organochlorosilanes. Molecular characterizations by GPC, 1H and 29Si NMR, and matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS) verified the molecular weights (Mn = 3.7–16.5 kg/mol), narrow distributions (Đ ≤ 1.18), and well-defined structures of the resulting PDMSs. Moreover, kinetics investigations indicated that the ROP of D3 catalyzed by C3N3-Me-P3 proceeded in a fast and kinetically controlled manner. This work demonstrated an efficient strategy to make well-defined functional polysiloxane materials using phosphazene as an organocatalyst.
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CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Yongsong Ma,Xianglin Liu,Mengyi Tang,Kaifa Du,Huayi Yin,Xuhui Mao,Dihua Wang
Heteroatom-doped carbon materials have been proved as potent catalysts for the remediation of organic contaminants. Herein, molten salt electrolysis (MSE) was employed to convert waste eggshell and Co 3 O 4 into N, P, S tri-doped core–shell catalyst (Co@NPSC), achieving the conversion of waste eggshell into value-added materials. Impressively, Co@NPSC/peroxymonosulfate (PMS) system exhibited an exceptional ultra-high turnover frequency (TOF) value of 83.86 min −1 for sulfamethoxazole (SMX) degradation with a low catalyst dosage of 0.001 g L –1 . Subsequently, density functional theory (DFT) simulation clarified the synergistic essences of catalytic oxidation (i.e., the Co@NPSC catalyst reduced the adsorption energy of PMS molecular on its surface, reduced itself work function, enhanced the length of the O-O bond ( I O-O ) of PMS molecule, and facilitated electron transfer for PMS activation). In addition, both theoretical predictions and acute toxicity assay results indicated that the degradation of SMX equals detoxification. This work provides a new insight into the reutilization of waste eggshell and the design of heteroatom-doped core–shell catalysts.
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NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 17
·8203-8214
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IF 3.925
Lingli Zhang,Han Tao,Chun Ji,Qiaoling Wu,Xiao Wang,Yuangeng Wu
As an alternative to bisphenol A (BPA), bisphenol S (BPS) is widely used in many consumer goods and industrial products. However, BPS has similar genotoxic, reproductive and endocrine disrupting effects to BPA and can enter the body through the food chain or by dermal absorption to endanger human health. This paper presents a rapid and direct electrochemical sensing technique for ultra-trace BPS determination on the basis of the signal amplification of the 1T phase & 2H phase hybrid MoS2 nanosheets (1T&2H-MoS2) and amino-functionalized carbon nanotube (CNTs-NH2) composites. The cooperative electrocatalytic effect and high-electrically active surface area of 1T&2H-MoS2/CNTs-NH2 composites not only facilitated the electron transfer between BPS and the electrode, but also promoted the adsorption of BPS on the electrode. Hence, the 1T&2H-MoS2/CNTs-NH2 modified electrode exhibited excellent electrocatalytic activity with a lower oxidation potential and higher peak current for BPS. Under the optimized conditions, the peak current response of BPS showed a good dose-dependent relationship with its concentration in the range of 0.02–1.0 μM and 1.0–70.0 μM, while the detection limit was as low as 8.6 nM. The proposed method was used to determine BPS in the mineral water bottle and orange juice samples with satisfactory spiked recoveries between 92.31% and 104.20%, demonstrating its reliability and practicality in real sample analysis. Furthermore, the sensing method has the characteristics of facile electrode fabrication, fast response (<4 min) and good reproducibility.
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MICROCHEMICAL JOURNAL
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2022
·
IF 5.304
Xiao Bai,Hang Yin,Chongchao Zhang,Ziyin Yang
Cobalt (Co) based nanomaterials are widely used to construct glucose enzyme-free electrochemical sensors. However, the correlation between anion species and the electrocatalytic activity of Co based nanomaterials remains unproven. In this paper, Co 3 X 4 with different anions (X = O, S, Se) were synthesized for electrochemical sensing of glucose. Co 3 X 4 was characterized by transmission electron microscopy (TEM), energy-dispersive X-ray spectrometry (EDX), powder X-ray diffractometry (XRD), and electrochemical techniques. The results showed that anion substitution had a significant effect on the electrocatalytic properties of Co 3 X 4 , and Co 3 Se 4 showed the strongest electrocatalytic activity for the oxidation of glucose. The sensor based on Co 3 Se 4 exhibited excellent performance for glucose analysis with a linear range from 2 μM to 0.71 mM, a high sensitivity of 1327.6 μA mM −1 cm −2 and a low detection limit of 0.3 μM, which demonstrates Co 3 Se 4 as a new nonenzymatic electrocatalyst for glucose sensing.
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ACS Applied Polymer Materials
·
2022
·
IF 4.855
Wenxiang Zhang,Zhongquan Peng,Xi Zhang,Qiwei Pan,Shumei Liu,Bo Cao,Jianqing Zhao
At present, high-performance liquid crystalline polyesters with a good processability, low dielectric constant, and low dielectric loss at a high frequency (GHz) are in high demand ascribed to the rapid development of high-speed communication technology. Here, an imide dicarboxylic acid (IA) with a bulky phenyl side group is designed and synthesized. It is then copolymerized with 4-hydroxybenzoic acid (HBA), isophthalic acid (IPA), 4,4′-dihydroxybipheny (BP), and 4,4′-dihydroxydiphenyl ether (ODP) via solution polycondensation to obtain liquid crystalline poly(ester imide)s (LCPEIs). By controlling the feeding ratio of IA, the solubility, thermal stability, mechanical properties, and dielectric properties of the LCPEIs are tunable. When the molar fraction of IA reaches or exceeds 5%, the obtained LCPEIs are soluble in ordinary organic solvents, such as chloroform, N,N-dimethylformamide, N-methyl-2-pyrrolidinone, and so forth, which allows a simple solution casting to prepare isotropic LC films. The nematic LCPEIs show high glass transition temperatures (Tg > 200 °C) but relatively low melting temperatures and isotropization temperatures (Tm and Ti, <340 °C). The LCPEI prepared with 10 mol % IA shows excellent combined properties, whose ηinh, Mn (GPC), Tg, Tm, Ti, Td5%, tensile strength, tensile modulus, water uptake, dielectric constant, and dielectric loss (at 10 GHz) are 0.92 dL g–1, 20,900 g mol–1, 218 °C, 268 °C, 330 °C, 458 °C, 80.5 MPa, 4.0 GPa, 0.39%, 3.07, and 0.006, respectively. These LCPEIs can be promising candidates for flexible copper-clad laminate substrates.
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