REACTIVE & FUNCTIONAL POLYMERS
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2019
·
IF 3.074
Xing Yang,Yayun Zheng,Lan Wang,Qingping Guo,Haiquan Shan,Zongxiang Xu,Jujie Luo
This work involves the preparation and characterization of poly(styrene-b-isoprene-b-styrene)-poly(dimethylsiloxane- co -methylhydrosiloxane) (SIS-c-PDMS-co-PMHS) crosslinked membranes towards CH 4 /N 2 separation. SIS-c-PDMS-co-PMHS was synthesized via a simple hydrosilylation reaction with various PDMS-co-PMHS contents. The structure of crosslinked membranes was investigated by Fourier transform infrared spectroscopy , indicating the degree of hydrosilylation reaction. The morphology of sample membranes was observed in detail by means of Scanning Electron Microscope analysis . Thermodynamic stability and the crosslinked behavior of crosslinked membranes were explored by thermogravimetric analysis and Soxhlet extraction experiments. Furthermore, single gas (CH 4 , N 2 ) permeability was measured using the time-lag method. The CH 4 permeability of crosslinked membranes with 70 wt% PDMS-co-PMHS could reach 503 Barrer at 25 °C and 1 bar, which is significantly greater than that of SIS (25.9 Barrer), while the CH 4 /N 2 ideal selectivity hardly changed. Notably, CH 4 permeability further improved by 77.6% (893.4 Barrer) as the temperature increased to 55 °C. For the CH 4 /N 2 (50/50 vol%) mixed gas, the SIS-c-PDMS-co-PMHS-70 sample membrane exhibited ideal gas separation performance relative to that of the pure SIS membrane (CH 4 : 447.4 vs. 24.2 Barrer，N 2 : 188.1 vs. 9.46 Barrer).
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TALANTA
·
2016
·
IF 4.035
Xixi Wang,Xueying Li,Xiaoya Jiang,Peipei Dong,Haiyan Liu,Ligai Bai,Hongyuan Yan
A high performance liquid chromatography (HPLC) monolithic column was prepared by redox polymerization of styrene , dipentaerythritol hexaacrylate (DPHA) and ethylene glycol dimethacrylate (EDMA) in a porogen system of n-propanol/PEG400. The monolith was characterized by scanning electron microscopy (SEM), mercury intrusion porosimetry (MIP) and the results indicated that the monolith had a stable and homogeneous structure. The porosity of the monolithic column was 75.86% and average pore diameter was 2.1 µm. Several alkylbenzenes and anilines were used to evaluate the column performance in terms of hydrophobicity . Then the column was applied to separate small molecules including phytosterol and BSA tryptic digest. Finally, five standard proteins, egg white and plasma were separated respectively and high separation capacity of protein was obtained.
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PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2013
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IF 2.39
Hongtao Cui,Yunan Zhao,Wanzhong Ren,Minmin Wang,Yan Liu
In this work, α-Co(OH) 2 and β-Co(OH) 2 nanosheets were selectively synthesized through an epoxide precipitation reaction under mediation of fluoride ions. The protonation and ring opening reaction of propylene oxide promoted the hydrolysis [Co(H 2 O) 6 ] 2+ to form a mixed phase of α-Co(OH) 2 and Co 2 (OH) 3 Cl in the condition of no existence of fluoride ions. Due to the enhanced hydrolysis of [Co(H 2 O) 6 ] 2+ under function of fluoride ions, pure phases of α-Co(OH) 2 and β-Co(OH) 2 were formed respectively at different concentration of fluoride ions. The mild reaction condition of this route allows for large scale synthesis of cobalt hydroxide nanosheets, which is only limited by volume of the vessel used as reactor.
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DALTON TRANSACTIONS
·
2014
·Vol. 43
·期 26
·9968-9975
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IF 4.097
Xiujuan Jiang,Li Long,Hailong Wang,Limei Chen,Xiaoming Liu
The CO-releasing behaviours of nine diiron carbonyl complexes (1–9) were examined via the substitution reaction of cysteamine (CysA), of which complex 4 was reported recently. These complexes fall into three categories, the diiron core bridged by two thiolates, a dithiolate and 1,8-naphthalene dithiolate. Our results reveal that the CO-releasing rates of these complexes are highly dependent on their structures. Complexes (2–4) bearing two monothiolates as their bridging linkage (“open” form) are more vulnerable to decomposition upon nucleophilic substitution reactions compared with complexes (6–9) that possess a dithiolate as their bridging linkage. When the bridging linkage lacks an electron-donating group (complex 1), the metal centre is less negatively charged as revealed by DFT calculation, and thus it exhibits fast substitution reaction with CysA to release CO. A linkage with conjugating nature (5) shows a similar effect because electron density on the metal centre decreases due to electron-density diverting from the metal centre into the naphthalene moiety. Kinetic analysis suggests that CO-releasing at the first stage of these complexes is a first-order reaction.
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CHEMOSPHERE
·
2024
·
IF 8.1
Yanfang Huang,Meimei Wang,Bingbing Liu,Shengpeng Su,Hu Sun,Shuzhen Yang,Guihong Han
Ion precipitation flotation technology was demonstrated to be an efficient method for the separation of valuable metals from low-concentration solution. However, the selective separation of three metals from mixing solution is a great challenge, and highly selective reagents are the key to polymetallic separation. In this work, stepwise separation of Co and Zn from the simulated zinc hydrometallurgy wastewater containing ternary Co–Zn–Mn metals by ion precipitation flotation process was proposed. It's demonstrated that organic reagents of 1-nitroso-2-naphthol (NN) and sodium dimethyldithiocarbamate (SDDC) had excellent selectivity for the capture of Co and Zn to form respective precipitate from wastewaters via the chelation reactions. After precipitation, dodecylpyridinium chloride (DPC) and tetradecyltrimethylammonium bromide (TTAB) were chosen as surfactants for the separation of Co and Zn sediments from the solution via the flotation process. The effects of solution pH, molar ratio, reaction temperature, and reaction time on the selective precipitation efficiencies of Co and Zn as well as the effects of surfactant dosage and flotation gas velocity on the flotation separation efficiencies were systematically investigated. It's demonstrated that the comprehensive recovery rates of Co, Mn, and Zn reach 98%, 90%, and 99%, respectively. After separation, oxidation calcination of the foam products was conducted to prepare high-purity Co 3 O 4 and ZnO nanoparticles in which the organic matters were burnt out with gas emissions. The stepwise chelation capture mechanisms of Co and Zn by highly selective precipitation reagents were minutely discussed. It's demonstrated that the proposed selective stepwise precipitation and flotation method is suitable for recovery of critical metal ions from low-concentration polymetallic wastewaters.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Dai-Xu Wei,Duanfang Cai,Youguo Tan,Kezhi Liu,Jin-Wei Dao,Xiang Li,Aikeremujiang Muheremu
Huperzine A (HupA) is used in Alzheimer's disease (AD) therapy for its effective inhibition of acetylcholinesterase (AChE) and enhancement of cholinergic neuronal function. However, direct oral administration and injection of HupA cause side effects like nausea, anorexia, and rapid metabolism. Using a tripolymer, poly(3-hydroxybutyrate- co -3-hydroxyvalerate-co-3-hydroxyhexanoate (PBVHx), from the polyhydroxyalkanoate (PHA) family synthesized via synthetic biology, we present a novel AD therapy strategy with peritoneally administered PBVHx microspheres loaded with HupA (HupA-PBVHxMs). This approach extends HupA's metabolic duration in the blood and brain, enhancing AChE inhibition efficacy. Uniformly sized HupA-PBVHxMs, created using microfluidics and rotary evaporation, show up to 70.4 % drug encapsulation efficiency, sustained HupA release for 40 days, reduced neurotoxicity from Aβ25–35, and maintained in vivo HupA supply and AChE inhibition for over 20 days. In cognitive tests, HupA-PBVHxMs improved function in AD mice. Thus, PBVHx microspheres with slower HupA release and lower biotoxicity offer a superior platform for sustained AChE inhibitor release, outperforming commercial PLGA microspheres.
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Journal of Water Process Engineering
·
2024
·
IF 6.3
Pengkun Zhang,Haoyu Wang,Yujie Lai,Yunzhuo Xu,Longyan Chen,Qinhan Wu,Dong-Hau Kuo,Dongfang Lu,Mengistu Tadesse Mosisa,Jiqing Li,Jinguo Lin,Xiaoyun Chen
The rising accumulation of pollutants, including heavy metals and toxic organics, necessitates effective environmental remediation to protect health and biological systems. In this study, a cubic cerianite CeO 2 -like Co/S co-doped CeO 2 sulfur-oxide catalyst (labeled as CeCoOS) with super catalytic reduction performance of pollutants with NaBH 4 as a reducing agent under dark was prepared via a green and facile preparation method. Transition metal Co 2+ -cation and S 2− -anion co-doped CeO 2 adjusted the energy bandgap and introduced oxygen vacancy (Vo), which converted Ce 4+ around Vo into Ce 3+ to maintain electric neutrality. The heterovalent Ce 4+ /Ce 3+ states in Co/S-CeO 2 enhance the electron lifetime and facilitate fast electron transfer . The valence transition between Ce 4+ /Ce 3+ and Vo make the Co/S co-doped in CeO 2 catalyst increase its electrochemically active surface sites and accelerate the pollutants reduction reaction. The CeCoOS-3 with Co/S dopants has an excellent catalytic reduction activity to completely reduce 20 ppm toxic 4-NP in 10 min, 50 ppm organic dyes of MB, RhB, and MO in 6 min, and 50 ppm heavy metal Cr 6+ in 10 min. The CeCoOS-3 sulfur-oxide catalyst also exhibited excellent stability in the reusability test. Therefore, CeCoOS sulfur-oxide catalysts are expected to be used for dye decolorization, detoxification of organic toxins, and reduction of electroplating wastewater.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
·
IF 7.7
Changzhou Chen,Jie Jiang,Yajun Liu,Xialin Ji,Mengqing Zhou,Jun Zhao,Jianchun Jiang
The enhanced utilization of biomass-derived chemicals for the generation of high value aromatics through an advanced catalytic strategy has captured considerable attention within the realm of eco-friendly manufacturing. This work presented four innovative three-dimensional rod-shaped mesoporous Ce-based MOF materials, which were coupled with a H-donor solvent to facilitate vanillin hydrodeoxygenation and macromolecular lignin. Under the optimized conditions (30 mg CoCe@C catalyst, 2 MPa N 2 pressure, 15 mL isopropanol, 190 °C, and 5 h), the CoCe@C catalyst achieved nearly complete conversion of vanillin and demonstrated 87.8 % selectivity in the hydrogen-donor solvent. The characterization findings suggested that the synergy between metallic Co and oxygen vacancy sites enabled the effective activation of CHO group in vanillin, leading to formation of reactive product MMP . In addition, the optimal CoCe@C catalyst could also achieve macromolecular lignin hydrodeoxygenation to obtain high yield of lignin oil products with narrower molecular weight distribution . This study presented a viable approach for the concurrent utilization of lignin derivatives in the generation of high value fuels and chemicals.
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POLYMER SCIENCE SERIES B
·
2015
·Vol. 57
·期 4
·313-321
·
IF 0.577
Huang Xia,Guo Ronghui,Lan Jianwu
To improve the low temperature elastic recovery and tensile properties of the traditional poly(ether-ester), a series of randomly branched poly(ether-ester)s consisting of poly(butylene isophthalate) as hard segment, poly(tetramethylene glycol) and poly(ethylene glycol) as mixed soft segment, and trimethylolpropane as trifunctional monomer were synthesized. The structure and composition of the samples were characterized by 1 H NMR and FTIR-spectroscopy. The tensile strength, elongation at break and the low temperature elastic recovery were used to characterize the mechanical properties of the synthetic polymers. The results indicate that the branched poly(ether-ester) showed an increment of mechanical and thermal properties with the increasing content of branching agent in the polymer matrix. Moreover, the low temperature elastic recovery and tensile properties of branched poly(ether-ester) were superior comparing to the traditional poly(ether-ester)s.
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Journal of Materials Chemistry A
·
2019
·Vol. 8
·期 6
·2995-3004
·
IF 10.733
Peng Wen,Kefei Zhao,Hui Li,Jiangsheng Li,Jing Li,Qing Ma,Scott M. Geyer,Lin Jiang,Yejun Qiu
Very recently, transition metal phosphides (TMPs) have emerged as low-cost and robust co-catalysts for decorating graphitic carbon nitride (g-C3N4) for photocatalytic hydrogen (H2) evolution. However, to date, little work has been done regarding the decoration approaches to hybridize TMPs on the g-C3N4 surface with homogeneous dispersion and intimate interfacial contact. Herein, we present a facile and convenient route to in situ incorporate g-C3N4 nanosheets (NSs) and Ni2P nanocrystal (NC) co-catalysts via a one-step co-heating solution approach. The Ni2P/g-C3N4 (in situ) hybrid photocatalyst achieved a far superior H2 production rate (2849.5 μmol g−1 h−1) and durability (no decrease after 4 cycles of reaction within 20 h) compared to the Ni2P/g-C3N4 (self-assembly) sample. The apparent quantum yield (AQY) of 18.8% at 420 nm was also much higher than that of other TMP co-catalyst loaded g-C3N4 hybrid photocatalysts. A possible Ni(δ+)–N(δ−) chemical coupling in the Ni2P/g-C3N4 (in situ) hybrid composite was proposed and corroborated by X-ray photoelectron spectroscopy (XPS) and X-ray absorption spectroscopy. The unique Ni(δ+)–N(δ−) chemical bonding states between g-C3N4 and Ni2P significantly accelerate the photo-generated charge-carrier separation and extraction from g-C3N4, as well as maintaining the H2 production durability. We believe that the hybridization route presented in this work will be extended to construct other TMP integrated photocatalysts toward efficient and stable solar water splitting.
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INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2021
·Vol. 22
·期 2
·928
·
IF 5.924
Muhammad Inam,Lu Liu,Jian-Wei Wang,Ka-Xi Yu,Chi-Uyen Phan,Jie Shen,Wen-Hua Zhang,Guping Tang,Xiurong Hu
Puerarin (PUE) is a Chinese traditional medicine known to enhance glucose uptake into the insulin cells to downregulate the blood glucose levels in the treatment of type II diabetes. Nevertheless, the bioavailability of pristine PUE is limited due to its poor solubility and low intestinal permeability. In this work, we demonstrate that the solubility of PUE can be significantly enhanced via its co-crystallization with L-Proline (PRO). Two crystalline phases, namely, the solvate-free form [PUE][PRO] (I) and the solvated form [PUE]2[PRO]∙EtOH∙(H2O)2(II) are isolated. These two phases are characterized by single-crystal X-ray diffraction (SCXRD), powder X-ray diffraction (PXRD), Fourier-transformed infrared (FT-IR) spectra, nuclear magnetic resonance (NMR), and thermogravimetric analysis in association with differential scanning calorimetry (TGA-DSC). The solubility and dissolution rate of bothIandIIin water, gastrointestinal tract at pH 1.2, and phosphate buffer at pH 6.8 indicates a nearly doubled increase as compared to the pristine PUE. 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay of pristine PUE,IandIIagainst murine colon cancer cell lines CT-26 and human kidney cell lines HEK-293 indicated that neither compound exhibits obvious cytotoxicity after 24 h. This work showcases that the readily available and biocompatible PRO can be a promising adjuvant to enhance the physicochemical properties of PUE toward orally administered drug formulation with improved pharmacokinetics.Keywords:puerarin;L-proline;pharmaceutical co-crystal;crystal structure;solubility and dissolution rate;Chinese traditional medicine;Hirschfeld analysis;hydrogen-bonding
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Frontiers of Chemical Science and Engineering
·
2021
·Vol. 16
·期 4
·498-510
·
IF 4.204
Bo Jinxiao,Li Mei,Zhu Xinli,Ge Qingfeng,Han Jinyu,Wang Hua
The electrochemical conversion of CO 2 -H 2 O into CO-H 2 using renewable energy is a promising technique for clean syngas production. Low-cost electrocatalysts to produce tunable syngas with a potential-independent CO/H 2 ratio are highly desired. Herein, a series of N -doped carbon nanotubes encapsulating binary alloy nanoparticles (M x Ni-NCNT, M= Fe, Co) were successfully fabricated through the co-pyrolysis of mela-mine and metal precursors. The M x Ni-NCNT samples exhibited bamboo-like nanotubular structures with a large specific surface area and high degree of graphitization. Their electrocatalytic performance for syngas production can be tuned by changing the alloy compositions and modifying the electronic structure of the carbon nanotube through the encapsulated metal nanoparticles. Consequently, syngas with a wide range of CO/H 2 ratios, from 0.5:1 to 3.4:1, can be produced on M x Ni-NCNT. More importantly, stable CO/H 2 ratios of 2:1 and 1.5:1, corresponding to the ratio to produce biofuels by syngas fermentation, could be realized on Co 1 Ni-NCNT and Co 2 Ni-NCNT, respectively, over a potential window of −0.8 to −1.2 V versus the reversible hydrogen electrode. Our work provides an approach to develop low-cost and potential-independent electrocatalysts to effectively produce syngas with an adjustable CO/H 2 ratio from electrochemical CO 2 reduction.
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