Frontiers of Chemical Science and Engineering
·
2018
·Vol. 12
·期 3
·457-466
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IF 2.643
Shang Jiaojiao,Yao Guo,Guo Ronghui,Zheng Wei,Gu Long,Lan Jianwu
Biodegradable poly(ether-imide-ester) elastomers were synthesized from succinic acid, 1,4-butanediol, polyethylene glycol 1000 and N ′, N -bis(2-carboxyethyl)- pyromellitimide which was derived from pyromellitic dianhydride and glycine. The chemical structures, crystallinities, thermal stabilities, mechanical properties, hydrophilicities and biodegradabilities of these elastomers were investigated. The hard segments of the linear aliphatic poly (ether-ester) exhibited monoclinic chain packing. Increasing the amount of aromatic bisimide moieties in the poly (ether-ester) reduced the crystallinity of the material and improved the thermal stability and tensile strength of the elastomers. In addition, introducing a suitable amount of aromatic bisimide moieties into the poly(ether-ester) backbones endowed the elastomers with improved biodegradability but too many aromatic bisimide groups reduced the biodegradability of the elastomers.
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Catalysis Science & Technology
·
2016
·Vol. 6
·期 16
·6217-6225
·
IF 5.287
Zuojun Wei,Jiongtao Lou,Zhenbin Li,Yingxin Liu
An efficient catalysis system composed of a Lewis–Brønsted acid mixture and Ru/C using N,N-dimethylformamide as a solvent was developed for the one-pot conversion of fructose to 2,5-dimethylfuran (2,5-DMF) via the dehydration/hydrogenolysis sequence. The effects of various reaction parameters, such as solvent, catalyst type, catalyst loading, reaction pressure, temperature and time, on single fructose dehydration, 5-hydroxymethylfurfural (5-HMF) hydrogenolysis and the one-pot conversion of fructose to 2,5-DMF were systematically investigated. The results showed that 2,5-DMF could be successfully produced with a yield as high as 66.3 mol% by using a one-pot method directly from fructose under the optimized reaction conditions, which is by far the highest yield ever reported for the production of 2,5-DMF from fructose through a one-pot strategy. The Ru/C catalyst could be reused at least three times with a slight decrease in 2,5-DMF yield.
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Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 20
·9873-9881
·
IF 8.867
Mingyu Tong,Shengwen Liu,Xian Zhang,Tianxing Wu,Haimin Zhang,Guozhong Wang,Yunxia Zhang,Xiaoguang Zhu,Huijun Zhao
Due to their controllable morphologies, tunable porous structures, diverse compositions and easy fabrication, metal–organic frameworks (MOFs) are an ideal class of precursor material to develop high performance carbon-based materials for energy applications. In this work, two-dimensional (2D) Co/Ni MOFs nanosheets with a molar ratio of Co2+ to Ni2+ of 1 : 1 were first synthesized at room temperature using thiophene-2,5-dicarboxylate (Tdc) and 4,4′-bipyridine (4,4′-Bpy) as organic linkers. As a precursor material, the as-synthesized 2D Co/Ni MOFs nanosheets were further pyrolized at 550 °C in N2 atmosphere to incorporate 2D CoNi alloy nanoparticles into S, N-doped carbon nanosheets (CoNi@SNC) with a surface area of 224 m2 g−1, a porous structure, and good conductivity. Interestingly, it was found that the 2D Co/Ni MOFs nanosheets can be directly used as electrode materials for supercapacitors, delivering a specific capacitance of 312 F g−1 at 1 A g−1, whereas CoNi@SNC derived from its MOFs precursor as an electrode material for supercapacitors exhibits a much higher specific capacitance (1970, 1897 and 1730 F g−1 at 1, 2, 5 A g−1, respectively) with long cycling life (retaining 95.1% of the value at 10 A g−1 after 3000 cycles) and excellent rate capability at a high charge/discharge current. Further, an asymmetric supercapacitor device was constructed with CoNi@SNC as the positive electrode and active carbon as the negative electrode, exhibiting an energy density of 55.7 W h kg−1 at a power density of 0.8 kW kg−1 with lifetime stability up to 4000 charge–discharge cycles (capacitance retention of ∼90.6%). The results demonstrate that electrochemical activation-generated CoNi oxides/oxyhydroxides on the surface of the CoNi alloy nanoparticles in alkaline electrolyte during electrochemical measurements are the electrochemical active species of the CoNi@SNC-constructed supercapacitor. Additionally, the high performance of the CoNi@SNC-constructed supercapacitor can be collectively attributed to its relatively high surface area, which is favourable for the exposure of electrochemical active sites; its porous structure, which promotes redox-related mass transport; and the combination of CoNi alloy nanoparticles with graphitic carbon, which functions as an electron collector to improve electron transfer.
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ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Jiangbo Xi,Chuyi Xie,Yan Zhang,Lu Wang,Jian Xiao,Xianming Duan,Jinghua Ren,Fei Xiao,Shuai Wang
The development of carbon based hollow-structured nanospheres (HNSs) materials has stimulated growing interest due to their controllable structure, high specific surface area, large void space, enhanced mass transport, and good biocompatibility. The incorporation of functional nanomaterials into their core and/or shell opens new horizons in designing functionalized HNSs for a wider spectrum of promising applications. In this work, we report a new type of functionalized HNSs based on Pd nanoparticles (NPs) decorated double shell structured N-doped graphene quantum dots (NGQDs)@N-doped carbon (NC) HNSs, with ultrafine Pd NPs and “nanozyme” NGQDs as dual signal-amplifying nanoprobes, and explore their promising application as a highly efficient electrocatalyst in electrochemical sensing of a newly emerging biomarker, i.e., hydrogen peroxide (H2O2), for cancer detection. Due to the synergistic effect of the robust and conductive HNS supports and catalytically active Pd NPs and NGQD in facilitating electron transfer, the NGQD@NC@Pd HNS hybrid material exhibits high electrocatalytic activity toward the direct reduction of H2O2 and can promote the electrochemical reduction reaction of H2O2 at a favorable potential of 0 V, which effectively restrains the redox of most electroactive species in physiological samples and eliminates interference signals. The resultant electrochemical H2O2 biosensor based hybrid HNSs materials demonstrates attractive performance, including low detection limit down to nanomole level, short response time within 2 s, as well as high sensitivity, reproducibility, selectivity, and stability, and have been used in real-time tracking of trace amounts of H2O2 secreted from different living cancer cells in a normal state and treated with chemotherapy and radiotherapy.
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JOURNAL OF SEPARATION SCIENCE
·
2013
·Vol. 36
·期 8
·1343-1348
·
IF 2.591
Qiuyun Wang,Yajin Xiong,Baozhu Lu,Jun Fan,Sheng Zhang,Shengrun Zheng,Weiguang Zhang
N -(2,4-dinitrophenyl)-proline and N -(2,4-dinitrophenyl)-serine were enantiomerically resolved on the BSA chiral stationary phase by HPLC in reversed-phase mode. Effects of chromatographic conditions on enantioseparation and elution order have been investigated in detail. For these two samples, reversal of enantiomer elution order was observed by changing buffer pH, the content of acetonitrile, or alcohol modifiers in mobile phase, which is firstly reported in the BSA chiral stationary phase studies. More interestingly, combined effect between buffer pH and the content of acetonitrile was also observed. In addition, coelution range of enantiomers varied along with the content of acetonitrile in mobile phase.
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Analytical Methods
·
2013
·Vol. 5
·期 20
·5444-5449
·
IF 1.855
Xin Wang,Yunchun Liu,Lianbing Ren,Hengye Li,Zhen Liu
A new hydrophilic boronate affinity monolithic capillary was synthesized for the selective capture of cis-diol biomolecules including glycoproteins and nucleosides, using (3-acrylamidophenyl)boronic acid (APBA) and N,N-methylenebisacrylamide (MBAA) as the functional monomer and cross-linker, respectively. A comparison with other compositionally similar monolithic capillaries was carried out in terms of reversed-phase retention, selectivity, binding capacity and binding pH. The poly(APBA-co-MBAA) monolithic capillary exhibited notably different properties. As both the functional monomer and the cross-linker are hydrophilic, the monolith capillary showed suppressed reversed-phase retention and as a result excellent selectivity toward both nucleosides and glycoproteins was observed. It exhibited the highest binding capacity as compared with other compositionally similar monolithic capillaries. Besides, because of the lower pKa value of APBA, the monolithic capillary was able to selectively capture nucleosides at near-physiological pH.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2017
·
IF 2.323
Bing Jia,Chao Zhang,Kun Xin,Yingmin Yu,Qingsong Li
Liquid–liquid equilibrium (LLE) data for the water + N,N-dimethylacetamide + solvents (chloroform, methyl isobutyl carbinol, methyl isobutyl ketone, isopropyl acetate, or isopropyl ether) ternary systems were determined at 308.2 and 298.2 K and at 101.3 kPa. Distribution coefficients and separation factors were calculated to evaluate the effectiveness of extracting N,N-dimethylacetamide from aqueous solution. The Othmer–Tobias equation and the Hand equation were used to confirm the reliability of the experimental LLE data. The experimental data were correlated by thermodynamic nonrandom two-liquid and universal quasichemical models, and the binary interaction parameter values were obtained from the data correlation.
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Probiotics and Antimicrobial Proteins
·
2024
·
IF 4.4
Zhu Yuan-ting,Wang Xing-jie,Liu Shu-liang,Lai Jing-hui,Li Jian-long,Li Qin,Hu Kai-di,Liu Ai-ping,Yang Yong,He Li,Chen Shu-juan,Ao Xiao-lin,Zou Li-kou
Phthalate acid esters (PAEs) and their metabolites, such as di- n -butyl phthalate (DBP) and mono- n -butyl phthalate (MBP), are known to cause male reproductive damage. Lactiplantibacillus plantarum RS20D has demonstrated the ability to remove both DBP and MBP in vitro, suggesting its potential as a detoxifying agent against these compounds. This study aimed to investigate the protective effects of RS20D on DBP or MBP-induced male reproductive toxicity in adolescent rats. Oral administration of RS20D significantly mitigated the histological damage to the testes caused by MBP or DBP, restored sperm concentration, morphological abnormalities, and the proliferation index in MBP-exposed rats, and partially reversed spermatogenic damage in DBP-exposed rats. Furthermore, RS20D restored serum levels of estradiol (E2) and testosterone, and superoxide dismutase (SOD) activity in DBP-exposed rats, significantly increased testosterone levels in MBP-exposed rats, and restored copper (Cu) concentrations in the testes after exposure to DBP or MBP. Additionally, RS20D effectively modulated the intestinal microbiota in DBP-exposed rats and partially ameliorated dysbiosis induced by MBP, which may be associated with the alleviation of reproductive toxic effects induced by DBP or MBP. In conclusion, this study demonstrates that RS20D administration can alleviate male reproductive toxicity and gut dysbacteriosis induced by DBP or MBP exposure, providing a dietary strategy for the bioremediation of PAEs and their metabolites.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Huizhen Sun,Xiuhua Chen,Zongdeng Wu,Wenhui Ma,Shaoyuan Li,Chen Li,Dandan Wu,Kaixin Fu,Kexiang Ding
Lead ions (Pb(II)) in industrial wastewater pose a serious threat to the ecological environment and human health due to their toxicity and persistence. Traditional treatment methods often struggle to achieve both efficient capture and sensitive detection of Pb(II). In this study, a novel bifunctional covalent organic framework (BTT-DHBD-COF) with ortho N-S/N-O dual sites was innovatively designed to enable highly selective adsorption and ultrasensitive detection of Pb(II). Adsorption studies revealed that the BTT-DHBD-COF exhibits a high adsorption capacity for Pb(II) (570.7 mg/g at pH 5) and rapid kinetics (equilibrium reached in 10 min). The BTT-DHBD-COF/GCE sensor demonstrated a wide linear detection range (0.0001–0.5 μM) and an ultralow detection limit (0.03 nM). In real water samples (lake water and tap water), it achieved high recovery rates of 96–108 % with relative standard deviations (RSDs) of 2.5–3.45 %. Experimental results and theoretical calculations confirmed that the N-S/N-O dual sites significantly enhance Pb(II) capture and detection through strong coordination (with Pb transferring 0.46 and 0.44 electrons to the N-S and N-O sites, respectively) and efficient electron conduction via the π-conjugated framework. Compared to single binding sites (S: 0.42 e, O: 0.40 e, N: 0.37 e), the significant charge transfer of the dual site highlights its key role. This work presents an innovative bifunctional “adsorption-detection” strategy for the remediation of Pb(II) pollution in industrial wastewater.
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JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2024
·
IF 1.9
Rong Wang,Shuai Liu,Zhongying Li,Guanyi Peng,Ming Duan,Jinlong Pan,Hui Dong
The synergistic effect of ionic liquids (ILs) and anionic surfactants, ILs and cationic surfactants, and ILs and nonionic surfactants to form microemulsions has been studied by other researchers, while the synergistic effect of ionic liquids and zwitterionic surfactants to form microemulsions has not been reported. Here, we report the synergistic effect of imidazolium ionic liquid, 1-hexadecyl-3-methylimidazolium bromide [C16mim] [Br], and betaine-type zwitterionic surfactant, cocamidopropyl hydroxysultaine (CAHS), as surfactants, to form microemulsions with n-butanol, n-hexane and water. Phase behavior of the systems with different mass ratios of two surfactants, varied mass ratios of surfactant to cosurfactant (Km), and different temperatures are investigated by pseudo-ternary phase diagrams. The single-phase region of the microemulsion is maximized when the ratio of CAHS to [C16mim] [Br] is 1:4 and Km is 1.5, with little temperature dependence. The size and the polarity of microemulsions are explored. The synergistic effect of [C16mim] [Br] and CAHS is confirmed by surface tension and interface tension. A universal preparation method to form microemulsions by combining ionic liquids with zwitterionic betaine-type surfactants is provided and it play a pivotal role in broadening the potential uses of ILs in microemulsions.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Dan Xu,Ruirui Liu,Jianfeng Li,Huacheng Zhao,Jiantai Ma,Zhengping Dong
Transfer hydrogenation reactions using non-noble metal-based nanocatalysts are extensively attractive due to their low-cost and green reaction conditions. But construction of such catalysts with maximum metal atom efficiency and high catalytic activity is still a challenging research goal. Here, atomically dispersed Co catalysts with Co-N 4 active sites were fabricated, which builds a bridge for transfer hydrogenation between nitroarenes and saturated N-heterocycles in aqueous solution. The TOF value of the transfer hydrogenation reaction is much higher than nanoparticle catalyst for this reaction. Density functional theory (DFT) calculations and control experiments reveal that the excellent performance origins from the Co-N 4 sites, which combines the dehydrogenation of 1,2,3,4-tetrahydroquinoline with hydrogenation of nitrobenzene in one-pot. This work not only has an in-depth understanding of active sites but also shows a unique activity to the challenging, highly efficient, and green transfer hydrogenation reaction.
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Environmental Science and Ecotechnology
·
2024
·
IF 14
Chang Liu,Lin Li,Linji Xu,Tanglong Zhang,Qiang He,Xiaodong Xin
N,N bis(carboxymethyl)- l -glutamate (GLDA) is an eco-friendly chelating agent that effectively extracts multivalent metal ions from waste activated sludge (WAS) flocs, which could potentially alter their structure. However, the effect of GLDA on the production of volatile fatty acids (VFAs) from WAS is not well known. Here, we demonstrate that pretreatment with GLDA at a concentration of 200 mmol per kg VSS results in a significant increase of 142 % in extractable extracellular polymeric substances and enhances the total VFAs yield by 64 % compared to untreated samples. We reveal GLDA's capability to mobilize organic-binding multivalent metal ions within sludge flocs. Specifically, post-pretreatment analyses showed the release of 69.1 mg L −1 of Ca and 109.8 mg L −1 of Fe ions from the flocs, leading to a more relaxed floc structure and a reduced apparent activation energy (10.6 versus 20 kJ mol −1 ) for WAS solubilization. Molecular dynamic simulations further demonstrate GLDA's preferential binding to Fe 3+ and Ca 2+ over Mg 2+ . Our study suggests that GLDA pretreatment causes minimal disruption to reactor stability, thereby indicating the stability of microbial community composition. GLDA has emerged as a viable pretreatment agent for enhancing volatile fatty acids production from waste activated sludge.
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