JOURNAL OF COORDINATION CHEMISTRY
·
2014
·
IF 2.212
Yu Jin,Chun-Hua Yu,Wen Zhang
Protonated benzylamine and its N-methylated derivatives, [C6H5CH2NH3−n(CH3)n]+ (n = 0−3), have been adopted as cations in chlorocadmate(II) and chlorocuprate(II) complexes, showing inorganic–organic hybrid architectures. For the Cd(II) compounds, the anionic structures vary from perovskite-type layers (n = 0) to chains (n = 1–3). For Cu(II) compounds, the anionic structures range from perovskite-type layers (n = 0), chains (n = 1) to mononuclear species (n = 2–3). Coordination geometries of the metal ions and intermolecular interactions have been analyzed. Their dielectric properties have been measured.
研究领域:
无机化学
·
材料科学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2020
·
IF 6.793
Xulei Zhao,Teng Zhang,Junhe Lu,Lei Zhou,Jean-Marc Chovelon,Yuefei Ji
Sulfate radical (SO 4 − )-based advanced oxidation processes (SR-AOPs) are promising in-situ chemical oxidation technologies widely applied for soil/groundwater remediation. The presence of non-target water constituents may interfere the abatement of contaminants by SR-AOPs as well as result in the formation of unintended byproducts. Herein, we reported the formation of toxic chloronitrophenols during thermally activated persulfate oxidation of 2-chlorophenol (2CP) in the presence of nitrite (NO 2 − ). 2-Chloro-4-nitrophenol (2C4NP) and 2-chloro-6-nitrophenol (2C6NP) were identified as nitrated byproducts of 2CP with total yield up to 90%. The formation of nitrated byproducts is a result of coupling reaction between 2CP phenoxyl radical (ClPhO ) and nitrogen dioxide radical (NO 2 ). As a critical step, the formation of ClPhO was supported by density functional theory (DFT) computation. Both 2C4NP and 2C6NP could convert to 2-chloro-4,6-dinitrophenol (2C46DNP) upon further treatment via a denitration-renitration process. The formation rate of 2C4NP and 2C6NP was closely dependent on the concentration of NO 2 − , solution pH, and natural water constituents. ECOSAR calculation suggests that chloronitrophenols are generally more hydrophobic and ecotoxic than 2CP. Our result therefore reveals the potential risks in the abatement of chlorophenols by SR-AOP, particularly when high level of NO 2 − is present in water matrix.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
Energy & Environmental Science
·
2025
·Vol. 18
·期 16
·8052-8065
·
IF 30.8
Junwei Han,Xinru Wei,Guanzhong Ma,Han Wang,Yiming Sun,Zihui Liu,Lu Zhao,Chenyu Ma,Qihao Liu,Wenting Feng,Debin Kong,Wei Lv,Quan-Hong Yang,Linjie Zhi
Rechargeable lithium–chlorine (Li–Cl2) batteries are recognized as powerful candidates for energy storage due to high energy density and adaptability in harsh environments. However, porous materials used in Li–Cl2 battery cathodes exhibit poor confinement of active chlorine species, which significantly challenges the rechargeability of batteries. Herein, we propose a blocking pore design to enable strong confinement and highly reversible conversion of chlorine species, where a narrow pore-entrance blocking effect confines LiCl growth in the pore body and suppresses Cl2 spillage from the pores. As a result, the obtained Li–Cl2 battery demonstrates a high gravimetric capacity of 3863 mAh g−1, along with a super-long cycle life (750 cycles) and remarkable rate capability (616 mAh g−1 at 30 A g−1). This work presents a novel chlorine confinement mechanism to improve the reversibility of chlorine conversion in metal-chlorine batteries.
研究领域:
电化学储能
·
材料科学
·
能源化学
·
纳米材料
·
电池技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Zifei Yan,Chencan Du,Yubin Wang,Jian Deng,Guangsheng Luo
Glycidyl esters, as a class of terminal epoxides, are important raw materials for the synthesis and modification of epoxy resins. Their synthetic routes via the dehydrochlorination of β-chlorohydrin esters are typically conducted under heterogeneous condition. Under the control of multiphase mass transfer, the inherently fast reaction can exhibit a very low observed reaction rate. Here we developed a continuous microflow system to determine the kinetic parameters of dehydrochlorination in the presence of aqueous NaOH solution. The same device was applied for the continuous production of glycidyl esters, and the conditions including flow velocity, alkali concentration, phase ratio and temperature were fully optimized. Comparing the obtained reaction performances in the microreactor with the conventional batch reactors, the required reaction time was shortened by 1/20 and the space–time yield was increased by 15 times, which is attributed to the mass transfer enhancement and the continuous operating mode. Finally, a mathematical model was established to calculate the volumetric mass transfer coefficients, whose value were in the range of 0.005–0.03 s −1 . The established microflow system and research methods could have high merit for guiding the kinetic studies and process intensification of other dehydrohalogenation reactions.
研究领域:
化学工程
·
有机合成
✓ 已验证
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2024
·
IF 2.8
Tong Jiale,Huang Yeyin,Tang Wanjun,You Qingliang,Xie Guangyong
This work aims at developing a customized ammoxidation catalyst through optimizing the metal oxide content in CrVO 4 /SiO 2 catalysts. Various amounts of Cr–V–O with 1:1 molar ratio of Cr/V were successfully loaded on SiO 2 via spray-drying method with colloidal silica as the binder. Polarized light microscope illustrated that the CrVO 4 /SiO 2 particles presented as well dispersed microspheres in the microsize (20–80 μm). X-ray diffraction spectra confirmed the formation of monoclinic CrVO 4 phase wherein the metal oxide content was ranged from 30 to 70 weight percent. FT-IR spectra indicated that the introduction of metal oxide had no obvious effects on the skeletal structure of SiO 2 . X-ray photoelectron spectroscopy analysis revealed that the valence state of V and Cr was hardly affected with increasing the metal oxide content. Performances of the obtained CrVO 4 /SiO 2 catalysts with different metal oxide contents were investigated via the ammoxidation of a model compound, namely para-chlorotoluene (PCT) to para-chlorobenzonitrile (PCBN). A maximum conversion of 99.6% of PCT and 86.5% yield and 86.8% selectivity to PCBN have been obtained over the CrVO 4 /SiO 2 catalyst with 60% weight of metal oxides at a temperature of 410 °C, n( PCT): n (NH 3 ): n (air) = 1:3:15 and reaction load = 0.13 g/gCat·h. In addition, this catalyst was efficient and selective toward ammoxidation reactions of toluene, ortho- and meta-chlorotoluenes. Graphical abstract
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2024
·
IF 6.3
Xi Man,Hao Lu,Qing Xu,Changjun Wang,Ziye Ling
Phase change materials (PCMs) present promising solutions for enhancing energy efficiency in solar heat pump systems . In our study, we have innovatively developed a composite PCMs (CPCMs) by combining sodium acetate trihydrate (CH 3 COONa·3H 2 O, SAT), lithium chloride (LiCl), potassium chloride (KCl), and incorporating expanded graphite (EG). This addition of high thermal conductivity EG was aimed at bolstering the CPCM's thermal stability. Our findings reveal that SAT-LiCl-KCl/EG CPCMs, with 14 wt% EG, significantly enhances thermal energy storage performance while preserving the fundamental phase change characteristics. The resulting CPCMs demonstrates a phase transition temperature of 49.3 °C and a latent heat of 196.4 J/g, ideally suited to meet the demands of hot water heat pump systems operating in the 45–50 °C range. Notably, the thermal conductivity of this CPCMs, following the incorporation of 14 wt% EG, registers at 4.54 W/(m K), representing a remarkable 10.6-fold increase compared to the SAT-LiCl-KCl ternary eutectic salt. To ensure long-term stability, secondary encapsulation with a thermally conductive sealant was applied. Subsequent tests involved subjecting the CPCM to 3000 heating/cooling cycles, resulting in minimal deviations, with the phase transition temperature shifting by approximately 1 °C and a modest 6 % reduction in latent heat of phase transition. These outcomes underscore the robustness and reliability of our developed composite phase change materials.
研究领域:
能源材料科学
·
热能工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Mengchen Wang,Jiayou Liao,Chengyun Gao,Jiwei Ma,Xianjie Meng,Yinghua Shen,Xu Wu,Yong Wang,Jinping Li
Hyperbranched polyimide (HBPI) membranes have emerged as promising materials for gas separation due to their loose interchain structure and large free volume. However, their widespread application is hindered by challenges such as complex synthesis procedures, high-cost monomers, and poor resistance to plasticization. In this study, a series of Trimesoylchloride (TMC)-branched 6FDA-based PI membranes were successfully synthesized using different contents of TMC as a branching agent to regulate the pore distribution. The molecular structure and degree of branching (DB) of HBPI were characterized using FTIR and 1 H NMR. The incorporation of TMC into the HBPI structure effectively enhanced the permeability and selectivity of the acyl chloride-branched PI membranes while improving thermal stability. The optimized membrane (A5-TMC content is 5%), exhibits the improving O 2 and CO 2 permeabilities of 176.52 and 930.94 Barrer combined with the O 2 /N 2 , CO 2 /N 2 and CO 2 /CH 4 selectivities of 4.68, 24.65 and 23.85, respectively. Particularly, the A5 HBPI membrane, with a DB value of 85.71%, demonstrated superior anti-aging properties compared to linear 6FDA-DAM membrane over 365 days. Most importantly, the 6FDA-DAM-TMC HBPI membranes significantly enhanced the resistance to plasticization at elevated CO 2 feed pressures, maintaining stability up to 300 psi and significantly outperforming the linear 6FDA-DAM membrane. This study provides an effective method for the fabrication of high-performance gas-separated polymer membranes with enhanced plasticization resistance and long-term durability for advanced gas separation applications.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2012
·
IF 3.461
Bo Yang,Shubo Deng,Gang Yu,Yonghong Lu,Hong Zhang,Jianzhong Xiao,Gang Chen,Xiaobing Cheng,Lili Shi
Nanoscale Al particles with average diameter of about 100 nm were employed to prepare Pd/Al nanoparticles (NPs) by chemical displacement deposition. It was proved that Pd 2+ acidic deposition solution was superior to its alkaline deposition solution in terms of Pd loading rate on Al NPs. The Pd/Al NPs were characterized by ICP–OES, SEM, TEM, XRD, BET and then used to explore hydrodechlorination (HDC) performance of 3-chlorophenol (3-CP) in aqueous solution. Major factors affecting HDC efficiency were investigated including Al substrate sizes, pH, Pd loadings in Pd/Al NPs, dosage of Pd/Al NPs, and temperature. The optimal results indicated that nanoscale Pd/Al bimetallic particles were highly effective for 3-CP HDC. HDC efficiency was only about 30% in 50 min reaction with micron sizes of Pd/Al particles (100–400 mesh), whereas it increased to 99.7% within 30 min using Pd/Al NPs at 25 °C. Aqueous pH presented remarkable effect on HDC and pH 3–4 was the optimum range for HDC as pH varied from 2 to 11. Pd loadings and Pd/Al dosages were optimized for highly effective HDC as 1.16 wt.% and 2 g/L, respectively. In addition, higher HDC performance was obtained while reaction temperature arrived at 45 °C and 0.389 mM of 3-CP could be completely dechlorinated into phenol only within 10 min reaction.
研究领域:
环境科学
·
纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
BIOINORGANIC CHEMISTRY AND APPLICATIONS
·
2015
·
IF 2.081
Zeyu Guan,Jinquan Wan,Yongwen Ma,Yan Wang,Yajie Shu
A novel amino-functionalized silica-coated nanoscale zerovalent iron (NZVI@SiO2-NH2) was successfully synthesized by using one-step liquid-phase method with the surface functionalization of nanoscale zerovalent iron (NZVI) to enhance degradation of chlorinated organic contaminants from anaerobic microbial system. NZVI@SiO2-NH2 nanoparticles were synthesized under optimal conditions with the uniform core-shell structure (80–100 nm), high loading of amino functionality (~0.9 wt%), and relatively large specific surface area (126.3 m2/g). The result demonstrated that well-dispersed NZVI@SiO2-NH2 nanoparticle with nFe0-core and amino-functional silicon shell can effectively remove 2,4,6-trichlorophenol (2,4,6-TCP) in the neutral condition, much higher than that of NZVI. Besides, the surface-modified nanoparticles (NZVI@SiO2-NH2) in anaerobic granule sludge system also showed a positive effect to promote anaerobic biodechlorination system. More than 94.6% of 2,4,6-TCP was removed from the combined NZVI@SiO2-NH2-anaerobic granular sludge system during the anaerobic dechlorination processes. Moreover, adding the appropriate concentration of NZVI@SiO2-NH2 in anaerobic granular sludge treatment system can decrease the toxicity of 2,4,6-TCP to anaerobic microorganisms and improved the cumulative amount of methane production and electron transport system activity. The results from this study clearly demonstrated that the NZVI@SiO2-NH2/anaerobic granular sludge system could become an effective and promising technology for the removal of chlorophenols in industrial wastewater.
研究领域:
环境科学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Guodong Jiang,Meng Wei,Songdong Yuan,Qing Chang
4-chlorophenol could be efficiently photoreductively dechlorinated over anatase TiO 2 nanocrystals with co-exposed {0 0 1} and {1 0 1} facets, which were synthesized and further characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Although fluorine could adsorb on {0 0 1} facets to decrease their surface energy, enabling TiO 2 to expose high energy {0 0 1} facets, the surface bonded fluorine might depress the photoreductive dechlorination efficiency of 4-chlorophenol, attributed to the electron trapping role of surface ≡Ti F groups. Due to the formation of a surface heterojunction between {1 0 1} and {0 0 1} facets in a single TiO 2 nanocrystal, electrons and holes were spontaneously self-separated and selectively migrate to {1 0 1} and {0 0 1} facets, respectively. Electron trapping experiments demonstrated that photogenerated electrons are the responsible for the reductive dechlorinaton of 4-chlorophenol to phenol. To avoid the oxidative degradation of 4-chlorophenol by holes and ensure sufficient electrons to reductively dechlorinate the substrate, moderate scavengers were required in the reaction system and dissolved oxygen, which might deplete electron on TiO 2 , also should be removed. With the optimal scavengers, the conversion efficiency of 4-chlorophenol (4-CP) achieved 97.5% and the selectivity for phenol was 92.5%, which were much higher than that of commercial TiO 2 P25.
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
Desalination and Water Treatment
·
2015
·
IF 1.173
Ping Yu,Qilong Sun,Jianfeng Li,Jianming Pan,Zhenjiang Tan,Yongsheng Yan
Poly(styrene-divinyl benzene) (St-DVB) magnetic porous microspheres were prepared by sulfonation for the adsorption of 2,4-dichlorophenol(2,4-DCP) and 2,4,6-trichlorophenol (2,4,6-TCP) from aqueous solution. The as-prepared microspheres were characterized by FT-IR, XRD, SEM, TGA, VSM, and N2 adsorption–desorption techniques, showing that the as-prepared microspheres were porous and had good magnetism (Ms = 40 emu g−1). The adsorption performance of St-DVB magnetic porous microspheres were investigated by batch mode adsorption experiments with respect to pH, temperature, initial concentration, and contact time. The St-DVB magnetic porous microspheres were sensitive to pH. The equilibrium data was better fitted to the Langmuir isotherm model than the Freundlich model. The kinetics experimental data was well fitted to the pseudo-second-order model. The thermodynamic parameters were calculated by the Gibbs free energy function, revealing that the adsorption process was spontaneous and endothermic. Furthermore, the St-DVB magnetic porous microspheres had good recycling performance.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2020
·Vol. 20
·期 12
·7469-7479
·
IF 1.134
Ji Dongliang,Zhang Meixing,Geng Xinxiang,Zha Zhenxing,Li Ying,Yang Jing,Cui Shihai
The graphitic carbon nitride (g-C3N4) and the Fe3O4/g-C3N4 magnetic materials were synthesized in this paper. The structures of the materials were confirmed by a series of analysis. The Fe3O4/g-C3N4
was then used as a sorbent to adsorb polychlorinated diphenyl ethers and polychlorinated biphenyls. Different extraction conditions were examined, including adsorbent amount, salinity, pH of the sample matrix, adsorption time, reaction temperature, elution solvent and preconcentration factor.
The maximum recoveries were obtained by employing methanol to desorb pollutants on 40.0 mg Fe3O4/g-C3N4 in 120.0 mL environmental water with a salinity of 5% (w/v) at a pH of 7 at 25 °C within 10 min. Using the optimized parameters, the detection
limits of the method are between 0.01 and 0.04 μ · L−1 with a satisfying linear relationship. The adsorbent can be recycled at least 10 times with no significant reduction in the extraction efficiency.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）