ACS Applied Polymer Materials
·
2023
·
IF 5
Jing Li,Jian Lu,Haoqi Sang,Yu Zhang,Benkun Qi,Jianquan Luo,Yinhua Wan,Yongbing Zhuang
Direct separation of lignin from fully acidic deep eutectic solvent (DES) is challenging because of its high viscosity and acidity. In this study, three synthesized DES-resistant polyimides (PIs), namely, B-PI, 6F-PI, and P-PI based on 4′,6-diamidino-2-phenylindole (DAPI) with 4,4′-(4,4′-isopropylidenediphenoxy)bis-(phthalic anhydride) (BPADA), 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) and pyromellitic dianhydride (PMDA), respectively, were used to prepare ultrafiltration (UF) membranes for the direct separation of sodium lignosulfonate (LS) from its DES (choline chloride:lactic acid) solutions for the first time. The morphology, pore size, surface property, degree of swelling, LS separation performance, and long-term stability of the resulting UF membranes were investigated in detail. The average pore sizes were in the range of 3.60–5.06 nm, and the LS rejections, as well as the DES fluxes, were 44.0–66.4% and 4.71–16.55 L·m–2 h–1, respectively, both higher than those from commercial ZrO2/TiO2 membrane (25.6% and 1.91 L·m–2 h–1). Among them, the B-PI membrane had the best separation performance and excellent operating stability for 20 h due to its low fractional free volume and poor affinity with DES. Swelling and positive charges of membrane surface in the DES system decreased LS rejection. In addition, a higher degree of swelling and affinity with DES led to an increased DES flux when compared with the aqueous system. Herein the PI-based UF membranes are promising for the direct lignin separation process, especially in an acidic DES system.
研究领域:
材料科学
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化学工程
·
环境科学
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Na Zhang,Qiang Li,Chunhui Li,Zhen Li,Li Zhao,Xiaotai Zhang,Yi Wang,Zhenghua Li,Xianghua Dou,Wanling Cui,Saisai Li
In this report, a highly ordered mesostructured flexible silica-based nanofiltration membrane is fabricated using tetraethyl orthosilicate (TEOS) as a silica source and Pluronic F127 copolymer as a structure directing agent , and hydrolyzed polyacrylonitrile ultrafiltration membrane as a substrate by an evaporation induced self-assembly approach. The results show the fabricated silica/F127 (SF) composite membrane possesses ordered mesostructures with different space groups depending on the mass ratios of TEOS/F127. The membrane is negatively charged with an isoelectric point at pH 2.9, and it also has a very hydrophilic surface. The pure water permeability of the membrane is 32 Lm −2 h −1 bar −1 . The membrane also has high rejections to methyl blue (100%) and multivalent salts ( > 95%), and moderate rejection to divalent salt (78.5% for Na 2 SO 4 ). The ordering of the mesostructure enhances the membrane compactness, favoring the improvement of the separation performance. Additionally, the membrane possesses satisfactory resistances to humic acid (HA) and bull serum albumin (BSA) fouling, and bacteria adhesion due to the smooth and hydrophilic surface. Additionally, the salt rejection is stable in 0.5 M HCl for 11 h and/or active chlorine solution (pH = 5) with 9000 ppm·h chlorination strength accompanied by an obvious increase in permeate flux. The membrane also exhibits satisfactory performance stability in a long-term (168 h) running.
研究领域:
材料科学
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环境工程
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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
·
2024
·
IF 8.4
Yafei Su,Huawen Peng,Yongjin Hu,Shaoping Li,Jingyi Rao,Qiang Zhao
Conventional polyamide and polyester thin film composite membranes (TFCMs) are susceptible to harsh conditions, because the amide and ester bonds in them will degrade under extreme pH or chlorine oxidants. This work addressed this problem by preparing TFCMs through the Hoffmann alkylation reaction. Two monomers, i.e., 1,4,7,10-Tetraazacyclododecane (TAD) and 1,2,4,5-Tetrakis(bromomethyl)benzene (TBB), were designed and underwent interfacial alkylation on polyacrylonitrile substrate. The TAD-TBB TFCMs feature high positive charge, and show good repulsion (>90%) to divalent cations. Benefiting from the stability of “C-N-C” bonds in TAD-TBB network, both the permeance (13.7 L m −2 h −1 bar −1 ) and cation rejection (90.3%–91.4%) of the TAD-TBB TFCMs are stable after being immersed in 2 M HCl for 21 days. Meanwhile, the TAD-TBB TFCMs maintained good separation performance (permeance: 13.9 L m −2 h −1 bar −1 , MgCl 2 rejection: 90.5%–92.2%) after a total free chlorine exposure of 96000 ppm h (200 ppm for 480 h). This work reported the preparation of cation-selective membranes stable in harsh environments.
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
SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS
·
2016
·
IF 3.433
Dong Wang,Kaiwen Guan,Zhiping Bai,Fuqiang Liu
A new facile coating strategy based on the hydrophobicity of methyl groups was developed to prevent nano-sized magnetite particles from strong acid corrosion. In this method, three steps of hydrolysis led to three layers of protection shell coating Fe3O4 nanoparticles. Filled with hydrophobic methyl groups, the middle layer mainly prevented the magnetic core from strong acid corrosion. These magnetite particles managed to resist 1 M HCl solution and 2.5 M H2SO4 solution. The acid resistant ability was higher than those reported previously. After further modification with amino-methylene-phosphonic groups, these magnetite particles successfully adsorbed Sb(III) in strong acid solution. This new strategy can also be applied to protect other materials from strong acid corrosion.
研究领域:
环境化学
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材料科学
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纳米技术
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污染控制
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吸附材料
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Ao Li,Chunyu Chen,Qingchao Jia,Shuyu Zhang,Shenrui Zhang,Yangsu Yao,Huidan Zeng
High acid resistance of terminal electrodes is crucial for the reliability of multilayer ceramic capacitor (MLCC). However, enhancing the acid resistance of the glass to protect terminal electrodes without sacrificing their sintering performance and adhesion strength remains a challenge. This work demonstrates that the acid resistance of the sealing glass can be significantly enhanced by promoting the release of Ti 4+ and Zr 4+ ions from the commercial BaTiO 3 ceramic substrate into the glass melt. During the sealing process, Ti 4+ and Zr 4+ ions diffuse from the BaTiO 3 based ceramic into the CaO-BaO-ZnO-B 2 O 3 -SiO 2 glass melt, which increases the bridging oxygen content and thereby strengthens the glass structural network. Moreover, Ti 4+ and Zr 4+ ions reduce the diameter of the diffusion channels within the passivation gel. This work reveals the significant roles of the interfacial ion diffusion in enhancing the acid resistance of the sealing glasses and provides a smart way to develop highly acid-resistant glasses for various applications.
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Cheng-Ye Zhu,Jia-Hui Xin,Chao Zhang,Hao-Cheng Yang,Hong-Qing Liang,Zhi-Kang Xu
Nanofiltration membranes integrating superior separation performance with robust operational stability are imperative for some harsh scenarios such high temperature and acid environment. Nevertheless, the simultaneous attainment of these two attributes remains a formidable challenge for benchmark polyamide nanofiltration membranes due to their unstable molecular structure under these scenarios. Herein, we report a kind of polyurea nanofiltration membranes with twisted and rigid skeleton, enabling exceptional dye/salt separation performance and remarkable resistance to strong acid and elevated temperature. The key to this comprehensive performance lies in employing tetrakis(4-aminophenyl)methane as the amine monomer. Its moderate reactivity and twisted geometry jointly facilitate the formation of a suitably loose polymer network by slowing polymerization and preventing dense chain packing, while the rigid aromatic structure confers enhanced robustness through a durable polymer backbone. Our polyurea membranes demonstrate rejections exceeding 96.7 % for six dyes with molecular weights above 586 Da, while maintaining low rejections below 20.0 % for four representative inorganic salts. The optimized membranes exhibit an impressive Congo Red/Na 2 SO 4 selectivity of 121.9 with a high water permeance of 22.3 L m −2 h −1 bar −1 , outperforming the commercial nanofiltration membrane NF270. Furthermore, the membranes retain stable separation performance even under 80 °C or after exposure to 20 wt% H 2 SO 4 for 30 days, which is attributed to their rigid aromatic backbone and chemically stable urea linkages. This advancement adds a novel dimension for exploiting highly selective and durable nanofiltration membranes suited for demanding separation processes.
研究领域:
材料科学
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膜分离技术
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高分子化学
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纳米技术
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环境工程
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-12
·
IF 14.7
Yang Kang,Li Ming,Gao Tianqi,Xu Guoliang,Li Di,Zheng Yao,Li Qiang,Duan Jingjing
Industrial CO 2 electrolysis via electrochemical CO 2 reduction has achieved progress in alkaline solutions, while the same reaction in acidic solution remains challenging because of severe hydrogen evolution side reactions, acid corrosion, and low target product selectivity. Herein, an industrial acidic CO 2 electrolysis to pure HCOOH system is realized in a proton-exchange-membrane electrolyzer using an acid-tolerant Bi-based metal-organic framework guided by a Pourbaix diagram. Significantly, the Faradaic efficiency of HCOOH synthesis reaches 95.10% at a large current density of 400 mA/cm 2 with a high CO 2 single-pass conversion efficiency of 64.91%. Moreover, the proton-exchange-membrane device also achieves an industrial-level current density of 250 mA/cm 2 under a relatively low voltage of 3.5 V for up to 100 h with a Faradaic efficiency of 93.5% for HCOOH production, which corresponds to an energy consumption of 200.65 kWh/kmol, production rate of 12.1 mmol/m 2 /s, and an energy conversion efficiency of 38.2%. These results will greatly aid the contemporary research moving toward commercial implementation and success of CO 2 electrolysis technology.
研究领域:
电化学
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材料科学
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环境工程
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产品关联
DOI
PubMed
高影响因子
DESALINATION
·
2025
·
IF 9.8
Wuqi Cai,Dongpu Hu,Huying Li,He Wen,Yimeng Shi,Jing Wang,Ziwen Dai,Wenbo Yu,Sha Liang,Jiakuan Yang,Shushan Yuan
Membrane-based methods offer a promising alternative for phosphoric acid concentration, addressing the limitations of conventional techniques. In this study, we employ a pervaporation system to achieve phosphoric acid concentration, evaluating its efficiency and stability under industrial-relevant conditions. Composite PVA-COF membranes were successfully prepared through vacuum filtration of TpPa-SO 3 H nanosheets and PVA on hydrophilic polytetrafluoroethylene (PTFE) support membranes and the followed crosslinking with glutaraldehyde. The incorporation of PVA effectively eliminates boundary defects and enhances the mechanical and operational stability of the composite membrane. The optimum COF-PVA composite membrane exhibits excellent rejection of NaCl (99.9 %) and an ultrafast water flux of 268.6 kg m −2 h −1 . The water flux surpasses that of most reported membranes. Moreover, the membrane exhibited outstanding acid resistance and durability in phosphoric acid concentration tests, maintaining stable operation for 420 min at 40 °C with no phosphorus leakage detected in permeate. The membrane demonstrated notable concentration efficiency, achieving an increase in phosphoric acid concentration from 20 % to 25 % during a sustained 180-min operational period at 70 °C. This work helps to explore the prospects for the application of pervaporation membranes in the fields of seawater desalination and phosphorus chemical industry. Synopsis The hybrid membrane composed of poly (vinyl alcohol) and covalent organic framework, which is characterized by high permeate flux, salt rejection rate and acid stability.
研究领域:
材料科学
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化学工程
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膜技术
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分离过程
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可持续化学
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产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Daqian Liu,Zuohai Liu,Min Huang,Taoyuan Xiu,Yun Wang,Zhirong Liu
A novel type of modified pyrolytic carbon (TOPO@PyC) was successfully prepared through incorporating tri-n-octyl phosphine oxide (TOPO). The adsorption behavior of TOPO@PyC for Th (IV) under strongly acidic conditions was investigated. The TOPO@PyC exhibited rapid Th(IV) adsorption rate with equilibrium time of 40 min. In 0.1–8 mol/l HNO 3 , the Th(IV) adsorption capacity reached between 43 and 50 mg/g. The adsorption kinetics and adsorption process of TOPO@PyC for Th(IV) can be well explained through the pseudo-second-order kinetic and Langmuir isothermal adsorption model. The temperature exhibited only a minor influence on Th(IV) adsorption capacity. The microstructure and adsorption mechanism of TOPO@PyC was characterized and elucidated through various techniques including SEM-EDS, BET, TGA, FT-IR, XPS and DFT calculations. By coordinating with O atom on TOPO, Th(IV) was successfully complexed on TOPO@PyC in a ratio of 1:3. Furthermore, TOPO@PyC manifested good thermal stability and acid resistance. After five times, the Th(IV) adsorption and desorption efficiency of TOPO@PyC still exceeded 95 %. Additionally, TOPO@PyC exhibited stronger selectivity towards Th(IV) from mixed solutions. Remarkably, it recovered over 90 % of thorium and uranium from the leachate of tantalum slag. Consequently, TOPO@PyC holds considerable promise in the treatment of strongly acidic wastewater containing thorium and uranium.
研究领域:
环境科学
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材料科学
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核化学
·
吸附技术
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产品关联
DOI
高影响因子
APPLIED RADIATION AND ISOTOPES
·
2025
·
IF 1.8
Tao Gao,Xiang Gong,Jiali Liu,Sheng Hu,Wei Yu,Yuhong Liu,Jiwei Liang
A method for regulating the rutile and anatase ratio of TiO 2 products by adding tartaric acid is reported. By this method, TiO 2 with a specific anatase/rutile ratio exhibited excellent selective adsorption performance of 68 Ge and 68 Ga. Experiment shows that Tartaric acid assist synthesized TiO 2 enabled strong 68 Ge adsorption but negligible adsorption of 68 Ga. Meanwhile, the TiO 2 adsorption exhibited significant acid resistance, with minimal Ti 4+ leaching. In addition, the 68 Ga elution efficiency and 68 Ge breakthrough of radioactivity experiments demonstrated that synthesized TiO 2 achieved an initial 68 Ga elution efficiency of 75%, which remained about 65% after 200 elution cycles. Furthermore, over the four-month observation period, the 68 Ge breakthrough of the TiO 2 adsorbent did not exhibit a significant increase, remaining below 1×10 -5 . Generally, the synthesized TiO 2 adsorbent exhibits potential as a 68 Ge/ 68 Ga generator column adsorbent with outstanding acid-resistant, radiation-resistant, efficient 68 Ga elution and low 68 Ge breakthrough for long-term.
研究领域:
材料科学
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核化学
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吸附技术
·
放射性药物
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产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 16
·47025-47037
·
IF 5.8
Wang Tianyu,Yang Lang,Rao Feng,Jiang Kaixi,Byrynnai Choduraa
Adding organics in the process of geopolymer synthesis can combine the functional groups of organics with the three-dimensional structure of geopolymer, thus changing the properties of geopolymer such as compressive strength, flexural strength, and acid resistance. In this work, excellent mechanical properties and acid resistance of metakaolin-blast furnance slag (Mk-BFS)-based geopolymer were synthesized by the incorporation of chitosan. The formation of sodium-alumino-silicate-hydrate (N-A-S–H) gel and calium-alumino-silicate-hydrate (C-A-S–H) gel in geopolymerization were characterized by 29 Si nuclear magnetic resonance (NMR). At 5% of chitosan, the compressive strength of Mk-BFS-based geopolymer could reach to 33.7 MPa. The results could be ascribed to that chitosan reacts with geopolymer to generate new C-O-Si structure meanwhile adhesion produced by the combination of positively charged cations and negatively charged ions makes the structure of geopolymer denser. After 7 days of sulfuric acid immersion, the reduction of compressive strength is less than 3 MPa, demonstrating its great acid resistance. The acid resistance of Mk-BFS-based geopolymer could attribute to that the free amino groups in chitosan preferentially react with acid solution and weakened the erosion of sulfuric acid. This study optimizes the compressive strength and acid resistance of geopolymer by adding appropriate amount of chitosan.
研究领域:
材料科学
·
硅酸盐化学
·
无机非金属材料
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功能复合材料
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建筑材料
✓ 已验证
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 118
·97256-97263
·
IF 3.84
Qianqian Huang,Weiqiang Yu,Rui Lu,Fang Lu,Jin Gao,Hong Miao,Jie Xu
Catalytic conversion and application of bio-based platform chemicals is of great significance. Itaconic acid, one of the abundant and renewable bio-based platform chemicals, could be hydrogenated to produce methylsuccinic acid, which has important applications in pharmaceutical synthesis. Traditional catalysts can be corroded, leached and deactivated in an acid reaction environment, and the stability of the catalysts is a great challenge. Carbothermal reduction was employed to prepare stable ruthenium-based catalysts, and the results confirmed that CO generated in situ functioned as an efficient reducing species in the carbothermal reduction process. The catalysts were applied for the hydrogenation of itaconic acid, and showed good stability and resistance to acid with no obvious loss of activity and less leaching in recycling tests compared to hydrogen reduced samples which exhibited an apparent decrease of 22% for the conversion of itaconic acid. The carbothermal reduced catalysts could maintain 99% conversion and 99% selectivity for methylsuccinic acid, and maintained good stability and acid-resistance under a higher temperature and longer reaction time.
研究领域:
催化化学
·
绿色化学
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生物质转化
·
有机合成
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材料化学
·
工业催化
·
可持续能源
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）