Polymer Chemistry
·
2016
·Vol. 7
·期 20
·3423-3433
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IF 5.687
Ke Wang,Zefeng Song,Chonggao Liu,Wangqing Zhang
The thermo- and pH/CO2-responsive poly[N-[2-(dialkylamino)ethyl]acrylamide]s containing a polyacrylamide backbone but different N-substitutes of dialkylamine were synthesized and their solution properties were comparatively checked. A controllable RAFT synthesis of poly[N-[2-(dialkylamino)ethyl]acrylamide]s was achieved when a typical trithiocarbonate containing an easily cleavable R group was employed. The RAFT polymerization rate decreases with the increasing C-number in the N-substitutes. The thermo- and pH/CO2-responsive property of poly[N-[2-(dialkylamino)ethyl]acrylamide]s is firmly correlative to the N-substitutes. With the C-number in the R-substitute increasing, the solution properties of poly(N-[2-(dialkylamino)ethyl]acrylamide)s undergo a soluble-to-thermoresponsive-to-insoluble evolution, and the critical pH of poly[N-[2-(dialkylamino)ethyl]acrylamide]s gradually decreases. The dialkylamine moieties in the poly[N-[2-(dialkylamino)ethyl]acrylamide]s lead to a characteristic CO2-response during CO2/N2 bubbling. The present study reveals the structure-dependent solution properties of the thermo- and pH/CO2-responsive poly[N-[2-(dialkylamino)ethyl]acrylamide]s, and these multistimuli-responsive polymers are believed to be very useful due to the controllable RAFT synthesis and tunable solution properties.
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ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Hongmei Chen,Xiaoqin Sun,Xiaoxiang Xu
Here we report two Ruddlesden-Popper type ferrite perovskites (SrO)(LaFeO 3 ) n (n = 1 and 2) which demonstrate p-type semiconductivity. Their crystal structure, optical absorption and other physicochemical properties have been systematically explored. Our results show that both ferrites crystallize in tetragonal symmetry with structural lamination along c axis. Efficient photocatalytic hydrogen production has been achieved for both samples under full range and visible light illumination. Better performance is noticed for LaSrFeO 4 with apparent quantum efficiency approaches 0.31% and 0.19% under full range and visible light illumination, respectively. The p-type semiconductivity is verified by their cathodic photocurrent as well as negative Mott-Schottky slop during Photoelectrochemical measurement. The relative lower activity for La 2 SrFe 2 O 7 compared to LaSrFeO 4 is likely due to its higher defect concentration which facilitates charge recombination. Both compounds exhibit anisotropic phenomenon for charge migrations according to theoretical calculations. Their p-type semiconductivity, strong visible light absorption, chemical inertness and high abundance of constituent elements signify promising applications in the field of solar energy conversion and optoelectronics.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Binhang Wang,Libo Sun,Tong Wang,Yujie Cao,Xiang Li,Wenhao Xu,Jie Zhang,Yun Tang
Ordered mesoporous Metal-Organic Frameworks ( meso MOFs), integrating mesopores and micropores, address mass transfer limitations characteristic of microporous materials, thus broadening their application spectrum. However, the synthesis of meso MOFs has been predominantly achievable in aqueous media, rather than in organic solvents, which are more conducive to the growth and stabilization of MOFs. This is primarily attributed to the challenge in forming stable and uniform micelles from block copolymers within organic systems. In this work, meso MOFs are synthesized within N,N-dimethylformamide (DMF) media for the first time, via a micellar microphase separation method facilitating by introducing trace water into the organic solvent DMF. These meso MOFs, featuring non-exposed spherical mesopores and inherent microporosity, demonstrate significantly enhanced performance in the accumulation of reactants, and such characteristics render these materials ideal nanoreactors, endowing them with superior adsorption and degradation capabilities. The adsorptive and degradation removal of tetracycline (TC) by m MIL-101 reached 93.7 %, with its efficiency in both adsorption and degradation of TC being significantly higher than that of traditional MIL-101. This synthetic approach expands the scope of meso MOFs preparation in organic solvents, providing insights for designing a new generation of meso MOFs with diverse compositions and structures, promising applications across various fields and advancing MOF-based technologies.
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FLUID PHASE EQUILIBRIA
·
2017
·
IF 2.473
Zhiyuan Ma,Anli Xu,Yongqin Du,Jian Wang,Hongkun Zhao,Guowang Diao,Xuedong Zhu,Xuhong Guo
Density, viscosity, refractive index and conductivity of switchable hydrophilicity solvent (SHS) systems ( N,N -dimethylbenzylamine (BDMA), water, and carbon dioxide) were measured as a function of molality of BDMAH-bicarbonate salt for the SHS system at temperatures from (283.15–308.15) K. Three empirical equations were successfully applied to correlate the density, viscosity, refractive index, and electrical conductivity of the SHS systems with temperature and BDMAH-bicarbonate salt concentration. From these experimental results, apparent molar volume , limiting partial molar volume , the relative viscosity and viscosity B -coefficients were calculated. The limiting apparent molar volumes ( V ϕ 0 ) and experimental slopes ( A v ) derived from the Redlich-Mayer type equation have been interpreted in terms of solute-solute and solute-solvent interactions. In terms of Jones-Dole equation, the viscosity B -coefficients with large positive value and dB/dT < 0 were obtained and these facts implied that the BDMAH-bicarbonate salt is water-structure-making.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2012
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IF 1.693
Yabo Hao,Songhong Zhang,Kejian Yao
Vapor–liquid equilibrium (VLE) data for methanol + tert-butylamine + N,N-dimethylformamide (DMF) and constituent binary systems containing tert-butylamine at 101.3 kPa were measured. A maximum boiling point azeotrope was observed at the methanol mole fraction of 0.763, corresponding to the temperature of 340.28 K for the binary system methanol + tert-butylamine. The binary equilibrium data were correlated using Wilson, nonrandom two-liquid (NRTL), and universal quasichemical activity coefficient (UNIQUAC) models, respectively. The VLE data of the ternary system were calculated with the binary interaction parameters of the NRTL model, and the average absolute deviations of the equilibrium temperature and the vapor-phase mole fractions for methanol and tert-butylamine were about 0.87 K, 0.014, and 0.018, respectively. The results show that DMF can break the azeotrope of the methanol + tert-butylamine system as a solvent.
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JOURNAL OF POLYMER RESEARCH
·
2025
·Vol. 32
·期 9
·1-17
·
IF 2.8
Zhang Rui,Ma Haihong,Zhou Zhengfa,Xu Weibing,Ren Fengmei
A modified silicone oil containing nitrogen, phosphorus, and sulfur was synthesized by the reaction of n-butyl thiophosphoric triamine (NBPT) and epoxidized silicone oil (ETSO), and named NBSO. The successful synthesis of NBSO was confirmed by Fourier infrared spectroscopy (FT-IR) and nuclear magnetic resonance spectroscopy (NMR). The flame retardant and smoke suppression properties of NBSO were investigated by open flame ignition method and cone calorimetry test (CCT). The results showed when the molar ratio of NBPT to ETSO was 1:1, the flame height of the modified silicone oil was significantly reduced, and compared with ETSO, the total smoke release (TSR) and the total heat release (THR) of NBSO was reduced by 67.6% and 68%, respectively. Thermogravimetric analysis (TGA), infrared thermogravimetric coupling (TG-IR), thermal field emission scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS) techniques were used to analyze the mechanism of flame retardant and smoke inhibition. The results indicate that compared with ETSO. NBSO has a slower thermal decomposition rate and releases less flammable gas.In the condense phase, nitrogen, phosphorus, silicon, and sulfur could improve the carbon forming ability through synergistic effect. At the same time, a silicon oxide layer was formed on the outer surface of the carbon layer, which could increase the flame retardation and smoke suppressing effect.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Xu Liu,Yuheng Zhao,Jun Ma,Yimo Zhang,Hui Zhang,Zhongqing Liu,Yuefeng Liu
The catalytic oxidation of H 2 S into element sulfur using nanocarbon materials is an effective means to solve environmental pollution and realize resource utilization of sulfur. Defect engineering and heteroatom doping are effective strategies for tuning the electronic structure of carbon materials to enhance their catalytic performance. Therefore, rationally exploiting the synergistic effects between defects and heteroatom sites, and elucidating the underlying catalytic mechanisms are essential for the development of high-performance carbon-based catalysts. In this study, we design and synthesize a series of N-doped carbon catalysts containing structural defects, which exhibit significantly enhanced desulfurization performance. Experimental results demonstrate that the NDC-700 catalyst exhibits excellent catalytic activity (95.0% H 2 S conversion and 94.4% S selectivity at 190 °C) and stability (>80 h) while maintaining high performance with high O 2 partial pressures and in the presence of impurity gases such as steam, CO 2 , and CO under mild conditions in continuous mode (≤ 200 °C). XPS analysis, kinetic studies, and oxygen activation experiments reveal that the catalytic performance improves with increasing defect density, despite a decrease in pyridinic N content. DFT calculations further indicate that defect structures substantially alter the local charge distribution around pyridinic N sites, promoting the adsorption and activation of H 2 S and O 2 , ultimately improving catalytic performance. This study elucidates the synergistic interaction between defects and N sites, and further confirms the critical role of defects in enhancing the catalytic function of N-doped carbon materials.
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INDUSTRIAL CROPS AND PRODUCTS
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2025
·
IF 6.2
Juping Yuan,Benkun Qi,Shuyi Li,Zhaoliang Cui,Yinhua Wan,Jianquan Luo,Zhenzhou Zhu
The increasing demand for sustainable filtration has driven the development of cellulose-based ultrafiltration membranes using green solvents. In the present study, microcrystalline cellulose (MCC) was dissolved in a co-solvent system combining N-methylmorpholine-N-oxide (NMMO) and a choline chloride (ChCl)/lactic acid (LA) deep eutectic solvent (DES) and cast into regenerated cellulose (RC) membranes via the nonsolvent-induced phase separation (NIPS). The effects of dope solution composition, preparation conditions, and post-treatment on membrane performance were systematically evaluated. Results indicated that dissolving 6 wt% MCC in an NMMO/DES mixture, with a mass ratio 80:20 (DES comprised ChCl and LA in a 1:2 molar ratio), followed by casting at 60 °C using a 300 μm knife gap, produced membranes with a permeability of around 30 L/m 2 ·h·bar (LMH/bar) and a bovine serum albumin (BSA) rejection rate of approximately 96 %. Replacing the water coagulation bath with a 40 % (v/v) ethanol aqueous solution increased permeability to about 46 LMH/bar while maintaining a high BSA rejection of about 93 %. Moreover, Hansen solubility parameters were utilized to assess the thermodynamic interactions among the polymer, solvent, and nonsolvent, elucidating their effect on membrane structure and performance. These findings highlight the potential of sustainable solvent system for fabricating RC membranes, thereby advancing sustainable filtration technologies.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Linsen Li,Zhuwei Yang,Xiao Yang,Hui Xiong,Zhao Jiang,Tao Fang
Liquid organic hydrogen carriers (LOHCs) are considered as promising candidates for large-scale hydrogen storage, which offers significant advantages in terms of hydrogen storage density, ease of storage and transportation. NPhCZ (N-phenylcarbazole)/18H-NPhCZ (perhydro-N-phenylcarbazole) is proposed as a typical system with high hydrogen storage capacity. However, low dehydrogenation activity and selectivity of catalysts restrict the cyclic efficiency of hydrogen storage. In this study, the efficient catalysts are designed by the immobilization of ultrafine, highly dispersed Pd nanoparticles onto Ni, N co-doped carbon materials through wet chemical reduction. The Pd/Ni@NC-10 catalyst exhibits the highest catalytic performance with 100 % conversion, 81.9 % selectivity of NPhCZ and 6.48 wt% hydrogen release amount. Combined with XRD, HRTEM, Raman, XPS, H 2 -TPR, N 2 physisorption characterization methods and DFT calculations, it is found that the doped Ni, N species could synergistically increase the dispersion of loaded Pd nanoparticles, as well as regulate the electronic state around Pd, which in turn accelerates the rate of the rate-limiting step. The evident interaction between Pd nanoparticles and Ni, N co-doped carbon brings the enhancement of dehydrogenation efficiency. Besides, the spent catalysts are measured by XRD, TEM, XPS and evaluated for the dehydrogenation reaction, indicating that Pd/Ni@NC-10 shows good structural stability, durability and recyclability. It provides practical guidance for the design of LOHCs dehydrogenation catalysts.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Fangshuo Jia,Yujuan Zhang,Xiaolong Ma,Zihao Zheng,Fuqiang An,Tuoping Hu
Water electrolysis coupling methanol oxidation is an energy-efficient hydrogen generation technology, while obtaining high-value formic acid, however, superior catalysts are often required to achieve efficient hydrogen production. Herein, the n - n heterojunction (NiCo 2 S 4 -MoS 2 ) composed of NiCo 2 S 4 nanoparticles uniformly dispersed on ultrathin MoS 2 nanosheet arrays has been prepared through hydrothermal-pyrolysis process. At a current density (j) of 10 mA cm −2 , the potentials of NiCo 2 S 4 -MoS 2 for methanol oxidation reaction (MOR) and hydrogen evolution reaction (HER) are respectively 1.282 V and −36 mV with very high selectivity for formic acid. Importantly, under the same conditions, by using the n - n heterojunction as electrodes, the voltage (1.355 V) of the methanol electrolysis is 216 mV lower than that of the water electrolysis. Meanwhile, at higher j of 100 mA cm −2 , the voltage of the methanol electrolysis is only 6.8 % higher than the original after 150 h chronopotentiometry (CP) test. The outstanding performance of NiCo 2 S 4 -MoS 2 exceeds that previously reported in most literature, which is primarily attributed to the fact that the built-in electric field (BEF) derived from the Fermi level (E F ) difference between NiCo 2 S 4 and MoS 2 , accelerates the charge transfer, optimizes the electronic structure of the heterojunctions, and thus improving the electrical conductivity. Furthermore, MoS 2 nanosheet arrays with large specific surface area provide a fast charge/mass transfer channel, uniformly dispersed NiCo 2 S 4 and defect sites produce abundant active sites. And the superior hydrophilicity and aerophobicity of the heterojunction surface accelerate the reaction kinetics. Finally, density functional theory (DFT) calculations show that the formation of the heterojunction optimizes the electron density and d-band center of composites, thus enhancing H* adsorption and CH 3 OH dehydrogenation kinetics.
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WATER RESEARCH
·
2025
·
IF 12.4
Jung-Hyun Son,Wen-Long Wang,Peng-Hui Liu,Hang Su,Ju-Won Lee,Min-Yong Lee,Qian-Yuan Wu
This study investigates the enhancement of ozonation efficiency through the introduction of manganese ions (O 3 /Mn(II)) that significantly improve the degradation of ozone-persistent organic pollutants. Manganese ions accelerate hydroxyl radical generation by catalyzing ozone decomposition, thereby facilitating more effective oxidative reactions. The application of O 3 /Mn(II) to degrade N, N-Diethyl-3-toluamide (DEET) achieved a decomposition efficiency of 3.6 to 4.1 times higher than ozonation alone. The promotive effect was highly pH-dependent, with the observed rate constant ( k obs ) for O 3 /Mn(II) reaching 97.05 M −1 s −1 at pH 4, approximately 3.3 times greater than ozonation alone, and 686.93 M −1 s −1 at pH 7, around 1.7 times higher. O 3 oxidation contributed approximately 1% to the overall process, while hydroxyl radicals accounted for approximately 80%, and manganese species accounted for approximately 20%. Furthermore, the oxidation state of manganese significantly influenced the cooperative oxidation efficiency, with Mn(VII) achieving the highest k obs (680.87 M −1 s −1 ), while Mn(IV) exhibited the lowest (304.6 M −1 s −1 ). Additionally, intermediate products formed during DEET oxidation were identified using Orbitrap technology, elucidating various degradation pathways (such as decarboxylation, tri-hydration, and aromatic ring opening). These findings provide valuable insights into enhancing ozonation processes for environmental remediation.
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MUTATION RESEARCH-GENETIC TOXICOLOGY AND ENVIRONMENTAL MUTAGENESIS
·
2020
·
IF 2.506
Xingchen Liu,Yihan Liu,Qi Cao,Ying Wu,Xueyun Huo,Xiaoyan Du,Zhenwen Chen
Age is an important factor in the evaluation of chemical toxicology. Chemical carcinogenic compounds can induce genomic mutations. However, few studies have been conducted on the association between genomic mutation frequency, such as microsatellite instability (MSI), and the age of mice treated with a nitrosourea mutagen. In the current work, we treated young (6 weeks) and old (10 months) mice with N -methyl- N -nitrosourea (MNU) for 4 months; the MSI frequency was then measured using polymerase chain reaction (PCR) and short tandem repeat (STR) scanning. The percentage of animals with MSI in the old group was significantly higher than that in the young group (100% and 75%). The frequency of MSI events was significantly different between the two groups as well (15.8% for old and 9.4% for young). The ratio of MSI loci displayed no obvious difference between the two groups. In addition, a few loci, including D15Mit5 and D8Mit14 exhibited the highest frequency of MSI events. Since specific loci showed increased MSI in the present study and a higher frequency in previous studies, these loci could be regarded as “hot spot”. These results suggested that old mice would be more susceptible to this mutagen, and prone to accrue MSI. The hot spot microsatellite loci are potentially useful markers for genomic instability analysis.
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