INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Guangbo Zeng,Dongqing Zhang,Liuming Yan,Baohua Yue,Ting Pan,Yidong Hu,Shufa He,Hongbin Zhao,Jiujun Zhang
Side-chain optimized poly (2,6-dimethyl-1,4-phenylene oxide)- g -poly (styrene sulfonic acid) (PPO- g -PSSA) is designed with balanced water-resistance and sulfonation degree. The PPO- g -PSSA is synthesized by controlled atom-transfer radical polymerization (ATRP) from brominated poly (2,6-dimethyl-1,4-phenylene oxide) (PPO- x Br) and ethyl styrene-4-sulfonate and followed by hydrolysis. A series of PPO-g-PSSA are prepared possessing different bromination degree (x) of PPO-xBr and polymerization degree (m) of the side-chains and the water-resistances of the fabricated membranes are investigated. The results show that a PPO-g-PSSA at relatively low x (x < 0.2) and high m (m > 4) exhibits good balance between the water-resistance and the sulfonation degree. Namely, it displays suitable proton conductivity with compromised water-resistance. Moreover, a maximum ion exchange capacity (IEC) of 3.24 mmol g −1 is reached without the sacrifice of water-resistance. In addition, PPO-g-0.08PSSA-13 and PPO-g-0.14PSSA-4 are chosen characterized by thermogravimetric analysis , proton conductivities and mechanical properties. At 90% RH, the optimized PPO-g-0.08PPSA-13 possesses a proton conductivity of 37.9 mS cm −1 at 40 °C and 45.5 mS cm −1 at 95 °C, respectively.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Xinmei Ma,Wenjing Lu,Yong Lin,Sen Yang,Guizhong Zhou,Ming Tan,Yang Zhang
Organic permeation through an ion exchange membrane is an urgent problem to be solved in electrodialysis (ED) processes on treating industrial wastewaters. However, how the salt, water, and organic compounds co-transport in an ED stack is still unclear. To reveal this, a series of cation exchange membranes (CEMs) were prepared in this work by using sulfonated polysulfone with different sulfonation degrees as a tool to “adjust” membrane water uptake and “control” water migration. The results showed that CEMs with a high sulfonation degree had positive correlation with desalination performance. Salt migration led to organic matter migration, while the presence of small molecule organics reduced the water flux and elevated the sodium flux, which favored the ED process. It was proven that the membrane sulfonation degree could be an important tool to adjust water permeation, and as a consequence, to improve the separation performance of salt from organic compounds in wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Jinbao Li,Ning Cui,Di Liu,Zhe Zhao,Fan Yang,Jundong Zhong,Jinhui Pang
Sulfonated poly(ether ether ketone)-poly(ether ketone) (SPEEK-co-PEK-x) copolymers with controlled degree of sulfonation are synthesized by the polycondensation reaction of varying monomer ratios. Compared with the traditional homopolymer sulfonated poly(ether ether ketone) (H-SPEEK), the SPEEK-co-PEK-x copolymer membrane has a high degree of sulfonation and excellent proton conductivity . Meanwhile, it also has favorable mechanical properties and stability. This is attributed to the introduction of the -PEK- segment. The SPEEK-co-PEK-75 membrane exhibits the highest conductivity (0.285 S cm −1 ) at 80 °C, 100% RH and when tests at 80 °C with 80% RH, the SPEEK-co-PEK-75 membrane reaches 0.0587 S cm −1 . In addition, the tensile strength of the SPEEK-co-PEK-75 membrane reaches 47.66 MPa at room temperature . Moreover, the study investigates the impact of key variables on the single-cell performance of SPEEK-co-PEK-x membranes. The measured peak power densities of the SPEEK-co-PEK-75 membrane are 212 mW cm −2 and 495 mW cm −2 at 70% RH and 100% RH, which are 1.3 times and 1.7 times higher than that of the Nafion 117 membrane, respectively. After the 80 h durability test at 80 °C and 80% RH, the voltage of the SPEEK-co-PEK-75 membrane only drops by 4.8%. The presence of the -PEK- segment results in a more compact and connected distribution of hydrophilic ion clusters in the SPEEK-co-PEK-X membrane. This adjustment greatly enhances the performance of the membrane, making it an excellent candidate for proton exchange membrane in H 2 /air fuel cells.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2015
·
IF 2.837
Huanfei Xu,Guang Yu,Xindong Mu,Chunyan Zhang,Paul DeRoussel,Chao Liu,Bin Li,Haisong Wang
A modified alkali pretreatment (MAP) process was established in both lab-scale and pilot-scale, based on the on-line production and utilization of lignosulfonate for improving enzymatic saccharification of corn stover. Sodium lignosulfonate (SLS) produced by directly sulfonating lignin in spent liquor separated from alkali pretreatment was reused in the next cycle of alkali pretreatment. The results showed that, by using 11 wt% NaOH, 2 wt% SLS and 0.1 wt% anthraquinone (AQ) in MAP, delignification rate and final total sugar yields could reach about 78% and 80% respectively, which were about 6% and 9% higher compared to the blank conventional NaOH pretreatment under the same conditions. In addition, sulfonation degree of SLS had linearly impact on the final total sugar yields.
研究领域:
生物化工
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生物技术
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Jinli Zhao,Luyao Ren,Qing-bai Chen,Pengfei Li,Jianyou Wang
Composite cation exchange membranes (CEMs) based on sulfonated polyether sulfone (SPES) with low sulfonation degree (DS) have been prepared in our previous studies. The results provided an approach for the preparation of CEM with low cost, environment-friendly technology, and ideal properties. On the basis of the previous research, the first purpose of this study was aimed to explore more suitable hydrophilic additives to further improve CEM properties. Hydrophilic polyethylene glycol (PEG) and polyvinylpyrrolidone (PVP) with different molecular weight (M w ) were used as hydrophilic additives, while SPES was still used as the matrix material. The results showed that PEG was not a suitable additive for CEMs due to the low M W , while stability was clearly improved with increased PVP M W . Hence, for researchers, there is no need to waste time on PEG as a hydrophilic agent of CEM prepared with this method in the future. The second purpose of this study, which was the further optimization of the CEM performance, was achieved in the research of suitable hydrophilic additives. The results of stability and electrodialysis showed that SPES blended with PVP K90 was the best prepared CEM. The third purpose was the investigation of mechanism of synergistic effects between sulfonated groups and hydrophilicity on membrane properties. In this part, an innovative concept of effective DS was put forward. This innovative concept will directly impact on ion transport mechanism, and have a very important influence on the preparation idea of CEM. In conclusion, this study is of great significance for selection of CEM materials, improvement of membrane stability and further study of ion transport mechanism.
研究领域:
材料科学
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环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
BIOPOLYMERS
·
2013
·Vol. 101
·期 3
·210-215
·
IF 2.879
Xin Liu,Tong Chen,Yan Hu,Kexin Li,Liushui Yan
Sulfated derivatives of polysaccharide from Momordica charantia L. (MCPS) with different degree of sulfation (DS) were synthesized by chlorosulfonic acid method with ionic liquids as solvent. Fourier transform infrared spectra and 13 C nuclear magnetic resonance spectra indicated that C-6 substitution was predominant in MCPS compared with the C-2 position. Compared with the native polysaccharide from Momordica charantia L. (MCP), MCPS exhibited more excellent antioxidant activities in vitro, which indicated that sulfated modification could enhance antioxidant activities of MCP. Furthermore, high DS and moderate molecular weight could improve the antioxidant activities of polysaccharide. © 2013 Wiley Periodicals, Inc. Biopolymers 101: 210–215, 2014.
研究领域:
生物大分子化学
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药学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 3
·1460-1470
·
IF 4.036
Xin Wen,Can He,Yuyan Hai,Rui Ma,Jianyu Sun,Xue Yang,Yunlong Qi,Hui Wei,Jingyun Chen
Sulfonated polysulfone (SPSF) with different sulfonation degrees (10%, 30%, and 50%) was added to polyethersulfone (PES) to improve the separation and antifouling performance of polyethersulfone ultrafiltration membranes. The PES/SPSF blend ultrafiltration membrane was prepared by the non-solvent induced phase inversion method (NIPS), and the effect of sulfonation degree on the ultrafiltration performance was studied. The compatibility of SPSF and PES was calculated by the group contribution method, and confirmed by differential scanning calorimetry (DSC). The morphology and surface roughness of the membrane were characterized by scanning electron microscopy (SEM) and atomic force microscopy (AFM), the chemical composition of the membrane was analyzed by X-ray photoelectron spectroscopy (XPS) and infrared spectroscopy (FTIR), and the permeability and anti-fouling performance of the blend membrane were studied through filtration experiments. The research shows that the flux and anti-fouling performance of the blend membrane have been improved after adding SPSF. When the sulfonation degree of the SPSF is 30%, the pure water flux of the blend membrane can reach 530 L m−2 h−1, the rejection rate of humic acid (HA) is 93%, the flux recovery rate of HA increases from 69.23% to 79.17%, and the flux recovery rate of BSA increases from 72.56% to 83%.
研究领域:
材料科学
·
环境工程
·
膜技术
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Jiashu Long,Xiaocan Zhang,Siqin Zeng,Tong Pei,Huixiao Ma,Xuesong Li,Xiaoyu Meng
Functionalized metal-organic frameworks (MOFs) are being extensively developed as viable fillers to enhance the proton conductivity of proton exchange membranes . Herein, an amino-pendant sulfonic acid bi-functionalized MOFs material (UNCS)-doped SPEEK membrane with low degree of sulfonation (DS) can improve the proton conductivity as well as maintain the membrane dimensional stability. UNCS can act as bridges of proton donors and acceptors to reduce the activation energy barrier and shorten the distance of long-range proton conduction. Among all as-prepared membranes, SPEEK/UNCS-3 exhibited the highest proton conductivity of 186.4 mS·cm −1 at 75 °C and 100% relative humidity (RH), which is much greater than that of pristine SPEEK and Nafion 117. Benefiting from the acid-base pair interaction between the amino groups of UNCS and the sulfonic acid groups of SPEEK, the dimensional stability and mechanical properties of the composite membranes were enhanced. More interestingly, STEM-HAADF and SAXS characterization consistently revealed that UNCS served as bridges among proton channels in the composite membranes for continuous proton transport.
研究领域:
材料科学
·
化学
·
电化学
·
高分子科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2016
·
IF 5.557
Hai Qiang Li,Xue Jiao Liu,Jingmei Xu,Da Xu,Hongzhe Ni,Shuang Wang,Zhe Wang
A series of triazole-grafted sulfonated poly(arylene ether ketone sulfone)s (SPTs) were fabricated via an amide coupling reaction between 3-amino-1,2,4-triazole and carboxylic acid group. The degree of sulfonation (DS) was set to 80% for preventing excessive swelling. The chemical structures of synthesized polymers were characterized by Fourier transform infrared spectroscopy (FT-IR) and 1 H NMR spectroscopy . The triazole group affected the properties of membranes dramatically. Increasing the triazole group content was conductive to promoting the thermal property and oxidative stability. And all SPT membranes retained above 92% of their weight after the test in Fenton's reagent at 80 °C for 1 h. The swelling ratio of SPT-3 membrane was only 12.66% and it was lower than that of C-SPAEKS-3 membrane at 100 °C. It was also found that the proton conductivity was distinctly improved by introducing triazole groups and the SPT-4 membrane exhibited a proton conductivity of 0.166 S cm −1 at 120 °C, which was larger than that of Nafion 117. In addition, all SPT membranes showed higher proton conductivity when compared with C-SPAEKS-3 membranes over the range of relative humidity from 20% to 90% at 80 °C.
研究领域:
材料科学
·
化学
·
高分子科学
·
燃料电池
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Bingzheng Jiang,Jiaxin Li,Dong Chen,Li Wang,Wantai Yang
The development and application of high-efficiency coal-water slurry (CWS) dispersants can foster the clean utilization of natural coal. CWS with excellent flowability and stability requires good adsorption capacity of dispersant on pulverized coal surface, which is influenced substantially by the architecture and hydrophilicity of dispersants molecule. In this study, a series of neutralized sulfonated poly(styrene- alt -maleic anhydride) (NSPSM) with different molecular weight (M n ) and sulfonation degree (SD) were synthesized by self-stabilized precipitation polymerization (2SP), gas-solid heterogeneous sulfonation reaction (GSR) and neutralization reaction with NaOH. The performance of NSPSM for CWS, and their dispersion and stabilization mechanisms were investigated in detail. Under optimized conditions, maximum slurry concentration (MSC) and water separation ratio (WSR) of slurry with NSPSM could reach 66.5% and 2.0%, respectively, which are superior to commercial naphthalene sulfonate formaldehyde condensate (NSF) dispersant. The outstanding dispersibility of NSPSM was ascribed to its improved adsorption capacity due to increased charge density along polymer chain, which can prevent agglomeration among coal particles through electrostatic repulsion.
研究领域:
化学工程
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2013
·Vol. 54
·期 9
·2013-2022
·
IF 1.243
Dongsheng Li,Zhimin Li,Fei Hu,Shengru Long,Gang Zhang,Jie Yang
A series of sulfonated poly(aryl ether sulfone) copolymers containing phenyl pendant groups with sulfonic acid groups on the backbone were synthesized through condensation polymerization. The degree of sulfonation (DS) of the copolymers was controlled by changing the feed ratios of sulfonated to unsulfonated monomers. Post-crosslink reactions are carried out with 4,4′-thiodibenzoic acid (TDA) as a crosslinker and the carboxylic acid groups in TDA can undergo Friedel–Craft acylation with the phenyls pendent rings in sulfonated poly(arylene ether sulfone)s copolymers to prepare polymer electrolyte membranes for fuel cell applications. The chemical structures of crosslinked and uncrosslinked sulfonated poly(arylene ether sulfone)s copolymers (SPSFs and CSPSFs) were characterized by FTIR, 1 H NMR spectra. The thermal and mechanical properties of the membranes were characterized by thermogravimetric analysis and stress–strain test. The dependence of water uptake, methanol permeability, proton conductivity, and selectivity on DS was studied. Transmission electron microscopic observations revealed that SPSFs and CSPSFs membranes form well-defined microphase separated structures. POLYM. ENG. SCI., 54:2013–2022, 2014. © 2013 Society of Plastics Engineers
研究领域:
材料科学
·
聚合物化学
·
电化学
·
燃料电池技术
✓ 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）