MATERIALS LETTERS
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2023
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IF 3
Cijian Zhang,Shicong Song,Qian Liu,Jiahui Li,Qi Cao,Shouhai Zhang,Xigao Jian,Zhihuan Weng
The innovative aerogel obtained by introducing bisphenol A-type polysulfone (PSF) as a precursor has excellent stability and can meet the need for thermal insulation at higher temperatures. In this study, PSF was modified by chloromethylation in a simple one-step process, and then PSF aerogels with tunable structural properties were tailored by changing the degree of chloromethyl and types of amino crosslinkers. This is the first report of the introduction of PSF into the aerogel field as far as we know. The density and volume shrinkage of the obtained aerogels were as low as 46.7 mg/cm 3 and 21.3%, respectively. Compared with aerogels made with triethylenetetramine as the cross-linking agent, aerogels obtained with polyetheramine D230 exhibited better structural stability, higher specific surface area and lower thermal conductivity (down to 0.036 W/mK), which was more favorable for the thermal insulating ability of the aerogel. These findings provide a new design idea for the selection of precursors for polymer-based aerogels.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2025
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IF 8.2
Shigui Peng,Kai Zhang,Min He,Qiao Fan,Lanlan Wei,Shuhao Qin,Tingting Luo,Lijuan Long,Jun Qin,Yufei Liu,Jie Yu
Poly(3,4-ethylenedioxythiophene) (PEDOT) is a prospective thermoelectric polymer owing to high conductivity, low thermal conductivity, and processability. However, the Seebeck coefficient of PEDOT is substantially lower than inorganics, and molecular design strategies to promote this coefficient are yet to be established. Here, the introduction of chloromethyl (-MeCl) on the surface of PEDOT has been established as an effective strategy for elevating its Seebeck coefficient. It was found that the electron-withdrawing effect of -MeCl decreases the highest occupied molecular orbital (HOMO) energy level and increases the oxidation potential of poly(chloromethylated 3,4-ethylenedioxythiophene) (PEDOT-MeCl). The space steric hindrance effect of -MeCl increases the layer spacing of PEDOT-MeCl. Furthermore, -MeCl severely disrupts the localized coplanar structure of PEDOT-MeCl, leading to a more difficult transition of the polariton into a dipolariton. Hence, PEDOT-MeCl is more difficult to be oxidatively doped, and the oxidation level is reduced compared to PEDOT. This ultimately leads to a 22.57% decrease in carrier concentration and a 33.06% increase in Seebeck coefficient for PEDOT-MeCl. This work opens up a new pathway for modulate the Seebeck coefficient of PEDOT.
研究领域:
材料科学
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化学
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产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Lin Zhou,Yangcheng Lu
Polystyrene-based magnetic composite nanoparticles with well-defined core-shell morphology, customizable surface functionalization , and adjustable magnetic properties are promising catalyst support materials. In this work, chloromethylated magnetic polystyrene composite nanoparticles are successfully prepared through RAFT-mediated surfactant-free emulsion polymerization . A comprehensive investigation is carried out to explore the influence of copolymer monomer ratios and polymerization degrees on emulsion polymerization conversion and encapsulation efficiency. The results unveil the critical importance of moderately adjusting the hydrophobic/hydrophilic properties of the macroRAFT agents in achieving an effective encapsulation process. Excessive monomer addition is found to disrupt the conditions necessary for emulsion polymerization by causing the detachment of macroRAFT agents from the surface of the modified Fe 3 O 4 nanoclusters . These results are instructive for the future rational design and synthesis of high-performance catalysts.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2018
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IF 6.578
Jiefeng Pan,Jincheng Ding,Yu Zheng,Congjie Gao,Bart. Van der Bruggen,Jiangnan Shen
In this study, high performance internally cross-linked monovalent selective anion exchange membranes were prepared via a one-pot approach by simply adding different amounts of sulfamerazine (SF) to partially-quaternized chloromethylated polysulfone (QPSF). The composition and structure of the prepared membranes were studied by Fourier transform infrared spectroscopy (FT-IR), Scanning electron microscope (SEM) and Atomic force microscopy (AFM). The monovalent anion selectivity was evaluated by electrodialysis using a Cl - /SO 4 2- system. The experimental results show that all QPSF-SF-x membranes exhibit excellent monovalent anion selectivity ( P SO 4 2 − Cl − = 3.98–15.90) at an average pH level of 6.0 because of the presence of sulfamerazine, which can change the compactness and electronegativity of the QPSF membranes. Especially, the optimized QPSF-SF-0.09 membrane had a permselectivity of 24.55 at pH 10.0 and showed an excellent permselectivity in alkaline condition. Based on an overall consideration of the facile synthesis procedure and the excellent monovalent ion selectivity of the resulting membranes, this process is expected to inspire the further investigation of monovalent anion selective membranes.
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
CHEMOSPHERE
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2020
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IF 5.778
Yue Sun,Weisheng Zheng
Using chloromethylated polystyrene resin, N , N -diethylaminoethyl methacrylate, and ethylene glycol dimethacrylate as support, functional monomer and cross-linker, respectively, the molecularly imprinted resin (MIR) and non-imprinted resin (NIR) were fabricated by the combination of atom transfer radical polymerization and surface imprinting technique for the selective adsorption of 4-hydroxybenzoic acid (4-HB) from aqueous solutions. The prepared adsorbents were characterized by N 2 adsorption/desorption isotherms, Fourier-transform infrared spectroscopy, and X-ray photoelectron spectroscopy. The adsorption processes of the 4-HB with MIR and NIR followed pseudo-second-order kinetics, and the adsorption isotherms were appreciably described by the Langmuir model. Furthermore, the adsorption efficiencies of MIR and NIR for different compounds in single and binary solutions proved that MIR exhibited high adsorption capacity and favorable selectivity toward 4-HB over other structurally related organic compounds (i.e., benzoic acid , 2-hydroxybenzoic acid, 3-hydroxybenzoic acid, phenol, and 2-hydroxynaphthalene). In addition, MIR could effectively remove 4-HB from a simulated effluent in a dynamic adsorption experiment. This study illustrates in-depth perspectives on the adsorption mechanisms of 4-HB onto MIR; interactions between the adsorbate and adsorbent were proposed based on the adsorption behaviours and instrumental analyses. The resulting MIR is a promising material for the interference-free adsorbent in the selective adsorption of 4-HB from mixed solutions.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Catalysts
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2019
·Vol. 9
·期 11
·963
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IF 3.444
Baoyou Pei,Xiaoyan Xiang,Ting Liu,Dongliang Li,Chaoyang Zhao,Rongxing Qiu,Xiaoyan Chen,Jinqing Lin,Xiaoyan Luo
Hyper-crosslinking polymers and its immobilized acid ionic liquid catalyst were prepared using cheap pitch, as a monomer, through hyper-crosslinking reactions and allyl chloride, as a chlorine source, for chloromethylation and further grafting with imidazole and functionalizing with sulfonic acid. The polymers were characterized by FE-SEM, FTIR, TG, and nitrogen sorption. The grafting ratios of the chloromethylated pitch-based hyper-crosslinked polymer (HCPpitch–CH2–Cl) and immobilized acid ionic liquid [HCPpitch–Im–Pros][Tos] were 3.5 mmol/g and 3.0 mmol/g, and the BET specific surface areas were 520 m2/g and 380 m2/g, respectively. This strategy provides an easy approach to preparing highly stable and acid functionalized mesoporous catalysts. The immobilized acidic ionic liquid was used as a catalyst for the esterification of oleic acid and methanol to synthesize biodiesel. The results demonstrated that under the optimal conditions of an alcohol to acid molar ratio of 7:1, ionic liquid to oleic acid molar ratio of 0.12, and a reaction time of 3 h at atmospheric pressure, the yield of methyl oleate can reach up to 93%. Moreover, the catalyst was reused five times without the yield decreasing significantly. This study shows that [HCPpitch–Im–Pros][Tos] is a robust catalyst for the synthesis of biodiesel.Keywords:immobilized acidic ionic liquid;hyper-crosslinked polymers;pitch;catalyst;biodiesel
研究领域:
材料科学
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催化化学
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能源化学
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DOI
高影响因子
CHEMOSPHERE
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2022
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IF 8.943
Shiyu Hou,Zheng-Hong Huang,Tianle Zhu,Yiliang Tang,Ye Sun,Xiang Li,Fangxia Shen
The heat desorption of styrene from adsorbents is impracticable owing to its spontaneous polymerization under heating conditions. However, the feature also brings a potential promoting effect on styrene adsorption. Therefore, it is expected to develop the non-regenerative adsorbents with large adsorption capacity by strengthening the polymerization effect. In this work, C–Cl grafted silica gel adsorbents were prepared by introducing (Chloromethyl)dimethylchlorosilane (CMDMCS) and FeCl 2 into silica gel. The C–Cl grafted silica gel exhibited excellent styrene adsorption performance, its adsorption amounts for styrene were 4.67 times and 9 times of unmodified silica gel under dry air condition and high humidity condition (RH = 80%), respectively. In addition, the adsorption of styrene on C–Cl grafted silica gel was almost unaffected by the presence of toluene. The characterization of adsorbents after styrene adsorption indicated that the improvement of adsorption capacity of C–Cl grafted silica gel for styrene can be attributed to atom transfer radical polymerization (ATRP) of styrene molecules on modified silica gel during adsorption process .
研究领域:
环境化学
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材料科学
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吸附分离
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高分子化学
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大气污染控制
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DOI
高影响因子
LANGMUIR
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2025
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IF 3.9
Xiuhua Sun,Xinyao Wang,Fuyu Sun,Changlu Gao
A novel chloromethylation (CM) approach was developed to graft the macroinitiator −CH2Cl onto aromatic backbone-bearing polymer materials such as polysulfone (PSf) in the aqueous phase, followed by atomic transfer radical polymerization (ATRP) of zwitterionic polysulfobetaine methacrylate (PSBMA) for antifouling modification. This CM reaction was completed in one step using a mixture of paraformaldehyde, hydrochloric acid, and a phase transfer catalyst (PTC), i.e., 3-(pyridinium-1-yl) propane-1-sulfonate inner salt. Advantages of the described method include: (1) No environmentally hazardous catalysts, such as SnCl4 and ZnCl2, were used. (2) The PTC was chemically stable and recyclable, which was superior to the water-sensitive, almost nonrecyclable Lewis acid. (3) The CM reaction occurred in the presence of hydrochloric acid rather than water-sensitive solvents (e.g., chloroform, sulfuric acid) used in the bulk modification method. Membranes were characterized by X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR) to verify the presence of −CH2Cl and PSBMA on the surfaces. Under the optimized CM and ATRP conditions, the obtained polysulfone membranes showed a water contact angle (WCA) as low as 25°, their pure water flux (PWF) and protein rejection were simultaneously enhanced, and the flux recovery ratio improved from 72.6% to 92.6%.
研究领域:
高分子科学
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膜科学与技术
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生物材料
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表面功能化
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抗污染材料
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产品关联
DOI
PubMed
高影响因子
ACS ES&T Engineering
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2023
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IF 7.1
Du Chen,Jianheng Hong,Lanjing Liu,Ningyi Chen,Bingjun Pan
Simultaneous sequestration and reduction of bichromate [Cr(VI)] poses an attractive and practical fashion for treating Cr(VI)-contaminated wastewater, for it not only immobilizes the pollutant but also reduces its toxicity. To this end, an EDA-functionalized adsorbent (EDA@CMPS) was developed with a simple one-step method by integrating ethylenediamine (EDA, a reversible redox unit) onto the skeleton of chloromethylated polystyrene adsorbent (CMPS), and it can sequestrate Cr(VI) and in situ reduce Cr(VI) to Cr(III), which was then immediately locked inside the adsorbent phase. Batch experiments confirmed that EDA@CMPS had a high removal capacity toward Cr(VI) (419 mg/g, at 25 °C), a large proportion of which was reduced to Cr(III) without leaking into the aqueous phase at pH ≥ 2. Ubiquitous anions (Cl–, NO3–, SO42–, and H2PO4–) and cations (Mg2+ and Ca2+) have a certain effect on the removal efficiencies, but EDA@CMPS still demonstrated satisfied Cr(VI) removal even with the competing ions at 100-times higher concentration. FT-IR and XPS analyses revealed that the amine group of EDA was responsible for sequestrating and reducing Cr(VI), where the amine group was oxidized into an imine group, which then played a key role in immobilizing the generated Cr(III) via chelation. Attractively, even under neutral conditions, EDA@CMPS also demonstrated decent removal and reduction performance toward Cr(VI). Furthermore, the yielded imine group can be perfectly restored to an amine group by simple alkali-acid treatment. Repeated removal–regeneration cycles verified the reusability of EDA@CMPS in treating Cr(VI) solution. Fixed-bed column experiments and treatment of a real electroplating wastewater further validated the potential of EDA@CMPS in treating Cr(VI) wastewater for practical application.
研究领域:
环境科学
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化学工程
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水处理
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Yingpeng Gu,Yue Sun
Nitrate (NO 3 − ) has become a global issue in the field of water treatment due to its extensive distribution in the natural waterbody and industrial process. Quaternary ammonium (R 4 N + ) strong based anion exchangers are still the main product used for NO 3 − remediation. However, the quaternary phosphonium groups (R 4 P + ) with stronger polarization and anionic affinity have not been adequately studied. This work employed triphenylphosphine (PPh 3 ) and tributylphosphine (TBP) to quaternize chloromethylated macroporous polystyrene resin (PS-Cl), and prepared novel strong anion exchangers (PS-PPh 3 and PS-TBP) for the selective adsorption of NO 3 − . These exchangers exhibited good adsorption performance for NO 3 − in the broad-spectrum pH range of 2.0–11.0. The adsorption capacities of PS-PPh 3 and PS-TBP fitted by Langmuir isotherm were approximately 20.14 and 25.53 mg NO 3 − -N/g, respectively. The adsorption processes of these exchangers could be fitted using pseudo-second-order (PSO) kinetic curves. Both selectivity experiments and density functional theory (DFT) indicated the superior NO 3 − selectivity of quaternary phosphonium exchangers, and demonstrated that the effect of charge distribution density of the exchanger on NO 3 − selectivity was greater than that of steric hindrance and hydrophobicity, which emphasized the importance of enhancing anionic affinity of functional group at low charge density. After five cycles of adsorption–desorption cycles with NaCl desorption solution, these two exchangers still maintained above 90 % of adsorption capacities for NO 3 − . The column experiment and benefit assessment also indicated that quaternary phosphonium exchangers had the good application value and potential to become a substitute for quaternary ammonium anion exchangers when facing extremely complex water matrix.
研究领域:
环境科学
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水处理
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化学工程
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材料科学
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产品关联
DOI
高影响因子
ENERGY & FUELS
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2020
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IF 3.421
Yue Shi,Zhongfu Zhao,Wei Liu,Chunqing Zhang
Two kinds of commercially available poly(styrene-b-butadiene-b-styrene) copolymers (SBS1301 and SBS1401) with 86–87% of 1,4-butadiene units were modified to fabricate robust poly(styrene-b-(ethylene-co-butylene)-b-styrene) (SEBS) anion exchange membranes (AEMs) via sequential hydrogenation, chloromethylation, quaternization, and alkalization. Its poly(ethylene-co-butylene) phase could provide a physically self-cross-linked structure responsible for the mechanical stability of AEMs, due to the crystalline behavior (Tm = ∼80 °C and ∼20% of crystallinity) of polyethylene segments after the hydrogenation of 1,4-butadiene units. The polystyrene phase was liberated from the chemical cross-linking structures to focus on conducting ion transport. Different from commercial SEBS based AEMs, this specially designed microphase separation structure led to low swelling ratio, high water uptake, and good hydroxide conductivity (e.g., ∼12%, ∼80%, ∼81 mS cm–1 at 80 °C) at moderate ion exchange capacity (IEC = 1.48 mmol g–1) for the SEBS1401-OH AEMs made from SBS1401. The single cell using SEBS1401-OH has a peak power density as high as 320 mW cm–2 while the current density achieves 860 mA cm–2. These results indicate that the proposed method can develop high-performance SEBS based AEMs, suitable for fuel cell applications.
研究领域:
材料科学
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化学工程
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能源技术
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产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
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2022
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IF 6.449
Yanmei Ma,Minwen Jiang,Xinjian Liu,Xiaoyu Xu,Xinxin Jiang,Ligang Chen,Na Niu
This work has prepared a hyper-crosslinked molecularly imprinted resins (MIRs) with chloromethylated polystyrene resin as a carrier through post-crosslinked Friedel-Crafts and surface imprinting. The prepared MIRs were used for the selective separation and purification of camptothecin (CPT). The prepared MIRs are grafted with a large amount of active group phenol, which have good hydrophilicity and are favorable for application in aqueous environments. The results of Scatchard analysis and contact angle test have proved that MIRs have good adsorption capacity and excellent hydrophilicity. In addition, the results of density functional theory (DFT) analysis show that the possible interaction forces between the template molecule CPT and the functional monomer phenol are the hydrogen bonds and electrostatic attraction. Moreover, MIRs are successfully used as a solid phase extraction (SPE) adsorbent to separate and purify CPT from Camptotheca acuminata fruit. The eluent obtained by SPE is analyzed through HPLC. The detection limit for CPT is 0.23 μg mL −1 . The established method preforms high the recovery of CPT (91.2–103.4%) with relative standard deviation less than 4.5%. The reusability of MIRs adsorbent is also investigated, and the adsorption efficiency is still above 95% after being recycled five times. The study provides a feasible and efficient method for selective separate and purify CPT from complicated system.
研究领域:
化学工程
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药学
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分析化学
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材料科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）