ENERGY & FUELS
·
2017
·
IF 3.091
Jun Cheng,Yannan Li,Leiqing Hu,Jianzhong Liu,Junhu Zhou,Kefa Cen
A phase-change solvent for CO2 absorption was prepared by mixing N-methyl-1,3-diaminopropane (MAPA) and N,N-dimethylformamide (DMF). In this MAPA/DMF solvent, MAPA-carbamate precipitate was formed after CO2 absorption to facilitate reducing energy consumption of amine regeneration. The CO2 uptake of MAPA/DMF solvent (14.8 mg/g solvent) was increased by 22% compared with that of MAPA/water solvent (12.1 mg/g solvent). For MAPA/DMF solvent, time was reduced by 22% to reach the CO2 absorption equilibrium. The maximum CO2 uptake rate of MAPA/DMF solvent was 30% higher than that of MAPA/water solvent because DMF displayed higher CO2 solubility and lower MAPA-carbamate solubility than water. Differential scanning calorimetry and thermogravimetry experiments revealed that MAPA(H+)2 and MAPA(CO2–)2 compositions in MAPA-carbamate precipitate first decomposed (peak temperature = 59.9 °C). Subsequently, the MAPACO2 compositions in precipitate also decomposed (peak temperature = 124.2 °C).
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
Inorganic and Nano-Metal Chemistry
·
2017
·
IF 0
Huimin Li,Shasha Li,Yuanrui Wang,Yafeng Li,Qian Qiao
In this article, two novel metal-organic frameworks (MOFs) have been constructed by tuning the metal ions using identical ligand—FDA. Although both of them contain linear trinuclear secondary building unit (SBU) and infinite chain along with SBU, the different metal ions as node can result in the different connection of FDA. As a result, compound I shows 4,4-networks, and compound II contains 3-ring and 4-ring.
✓ 已验证
DOI
CHINESE JOURNAL OF CATALYSIS
·
2021
·
IF 8.271
Lutian Zhao,Yangge Guo,Cehuang Fu,Liuxuan Luo,Guanghua Wei,Shuiyun Shen,Junliang Zhang
In this work, highly monodispersed Pt-Ni alloy nanoparticles were directly deposited on carbon substrate through a facile electrodeposition strategy in the solvent system of N,N -dimethylformamide (DMF). A series of carbon supported Pt-Ni alloy electrocatalysts were synthesized under different applied electrode potentials. Among all as-obtained samples, the Pt-Ni/C electrocatalyst deposited at –1.73 V exhibits the optimal specific activity up to 1.850 mA cm −2 at 0.9 V vs . RHE, which is 6.85 times higher than that of the commercial Pt/C. Comprehensive physiochemical characterizations and computational evaluations via density functional theory were conducted to unveil the nucleation and growth mechanism of PtNi alloy formation. Compared to the aqueous solution, DMF solvent molecule must not be neglected in avoiding particle agglomeration and synthesis of monodispersed nanoparticles. During the alloy co-deposition process, Ni sites produced through the reduction of Ni(II) precursor not only facilitates Pt-Ni alloy crystal nucleation but also in favor of further Pt reduction on the Ni-inserted Pt surface. As for the deposition potential, it adjusts the final particle size. This work provides a hopeful extended Pt-based catalyst layer production strategy for proton exchange membrane fuel cells and a new idea for the nucleation and growth mechanism exploration for electrodeposited Pt alloy.
研究领域:
材料科学
·
催化化学
·
燃料电池研究
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Yanyan Cheng,Fujian Li,Qingrong Wu,Kuilin Peng,Bangyu Fan,Yinge Bai,Zhongzhi Wang,Nian Zhang,Xiangping Zhang
Metal-containing ionic liquids (MILs) have been considered as promising solvents for ethylene/ethane (C 2 H 4 /C 2 H 6 ) separation. With multiple 4f and 5d empty electronic orbitals, special electronic configuration and abundant electron energy levels, rare earth elements have potential to be great electron acceptor of C 2 H 4 . Herein, a new strategy of rare earth metal ionic liquids (REMILs), 1-butyl-3-methylimidazolium trifluoromethanesulfonate containing erbium ([Bmim][TFO]/Er(TFO) 3 ) in N, N-dimethylformamide (DMF) was exploited to separate C 2 H 4 /C 2 H 6 for the first time. The complexation between Er 3+ and C 2 H 4 and interactions in absorbents were adopted to achieve fast and selective C 2 H 4 absorption. The physical properties of the absorbents were measured and studied firstly. The addition of 20 wt% DMF in REMILs was optimized with a decrease in viscosity of 6–7 times at 293 K. The absorption parameters, such as Er 3+ concentration, temperature and regeneration of absorbents were also investigated systematically. The results showed that the selectivity of C 2 H 4 /C 2 H 6 was enhanced with increasing Er 3+ concentration. The solubility of C 2 H 4 in [Bmim][TFO]/Er(TFO) 3 + 20 wt% DMF was 0.95 mg/g with C 2 H 4 /C 2 H 6 selectivity of 10 (at 303 K, 0.1 MPa), much higher than that of conventional ILs. The interaction energy (ΔE) of Er 3+ -C 2 H 4 was more negative than Er 3+ -C 2 H 6 through density functional theory (DFT). Furthermore, the rare earth absorbents exhibited excellent reversibility after five cycles. In summary, this work provides a potential method for efficient separating C 2 H 4 /C 2 H 6 via REMILs in DMF solution.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2026
·
IF 6.7
Xiaoxiao Zhou,Miaomiao Feng,Dandan Luo,Lan Yi,Jialing Chen,Pengzhi Bei,Hao Luo,Xiaoqin Wu,Wen-Ying Li
Unlocking the cross-linked network structure of low-rank coal is pivotal for its high-value utilization, yet this process is severely constrained by mass transfer resistance. To address this challenge, a “carrier-permeation” synergistic strategy is proposed herein, which integrates high-permeability dimethylformamide (DMF) with high-activity deep eutectic solvents (DES). Molecular dynamics simulations indicate that DMF may function as a molecular carrier, promoting the deep penetration of viscous DES components into the coal matrix. Experimentally, this synergistic effect induces substantial physical restructuring: particle size is reduced by more than 82% (to 22.57 μm) and the aromatic interlayer spacing ( d 002 ) is increased to 0.355 nm via effective disruption of stacking interactions. Chemically, the system achieves an exceptional desulfurization rate of 90.81%, along with the selective cleavage of ether bridges and long aliphatic chains (CH 2 /CH 3 ratio minimized to 2.71). Consequently, pyrolysis pathways are substantially redirected by this structural remodeling, shifting product distribution from low-value alkanes to high-value olefins (50.47%) and esters (24.09%). A molecular-scale deconstruction system is elucidated, offering a novel approach for clean and value-added utilization of lignite.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Yan Li,Fang-Ting Liu,Hui-Xia Zhang,Xue Li,Xiao-Fei Dong,Cheng-Wei Wang
Designing adsorbents possessing high-efficient and selective adsorption performance is valuable for water pollution control, yet challengeable. Herein, a new N , N -dimethylformamide (DMF)-hydrothermal strategy was introduced to treat amorphous carbon nanospheres (CNPs) to make it possess a pH-sensitive and high selective adsorption behavior for organic dye. Excitingly, the surface electrical behavior of DMF-CNPs and CNPs are entirely different at pH 5.0, and thus in striking contrast to CNPs, DMF-CNPs exhibits a rapid removal of 70 mg L −1 cationic rhodamine B (at least 99% within 10 min), and also a pH-sensitive adsorption with a maximum adsorbability of 63.85 mg g −1 at pH 9.0 and a minimum value of 32.99 mg g −1 at pH 3.0. The DMF-CNPs's adsorption mechanism could be well explained the pseudo-second-order kinetic model and better fitted the Langmuir isotherm model with a high adsorption capacity of 56.56 mg g −1 at pH 6.5. The significantly improved adsorption performance of DMF-CNPs could be mainly ascribed to its doubled specific surface area, more positive charged active sites of oxygen-containing functional groups available for synergistic adsorption.
研究领域:
环境科学
·
材料科学
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2017
·
IF 4.601
Yannan Li,Jun Cheng,Leiqing Hu,Jianzhong Liu,Junhu Zhou,Kefa Cen
In order to reduce energy consumption of absorbent regeneration, an amine absorbent piperazine (PZ) was dissolved in an organic solvent N , N -dimethylformamide (DMF) to prepare a phase-changing PZ/DMF solution for CO 2 absorption with solid precipitate of PZ-carbamate. The CO 2 absorption capacity and peak rate of PZ/DMF solution were 22.9% and 29% higher than those of PZ/water solution, respectively. Based on differential scanning calorimetry/thermogravimetry experiments, biscarbamate PZ(CO 2 ) 2 2− and protonation PZ(H) 2 2+ compositions (34.5 wt%) in the PZ-carbamate precipitate mainly decomposed at peak temperature of 91.9 °C due to their instability, and then PZ(CO 2 ) composition (65.5 wt%) in the PZ-carbamate precipitate decomposed at peak temperature of 125.7 °C. The electrochemical corrosion tests and scanning electron microscopy revealed that PZ/DMF solution had much lower corrosivity than PZ/water solution.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Bo Yu,Xinqiang Wang,Fei Qi,Binjie Zheng,Jiarui He,Jie Lin,Wanli Zhang,Yanrong Li,Yuanfu Chen
For the first time, self-assembled coral-like hierarchical architecture constructed by NiSe2 nanocrystals has been synthesized via a facile one-pot DMF-solvothermal method. Compared with hydrothermally synthesized NiSe2 (H-NiSe2), the DMF-solvothermally synthesized nanocrystalline NiSe2 (DNC-NiSe2) exhibits superior performance of hydrogen evolution reaction (HER): it has a very low onset overpotential of ∼136 mV (vs RHE), a very high cathode current density of 40 mA/cm2 at ∼200 mV (vs RHE), and an excellent long-term stability; most importantly, it delivers an ultrasmall Tafel slope of 29.4 mV dec–1, which is the lowest ever reported for NiSe2-based catalysts, and even lower than that of precious platinum (Pt) catalyst (30.8 mV dec–1). The superior HER performance of DNC-NiSe2 is attributed to the unique self-assembled coral-like network, which is a benefit to form abundant active sites and facilitates the charge transportation due to the inherent high conductivity of NiSe2 nanocrystals. The DNC-NiSe2 is promising to be a viable alternative to precious metal catalysts for hydrogen evolution.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
PubMed
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2013
·Vol. 25
·期 2
·168-172
·
IF 1.635
Li Zhu,Jinmin Qin,Xueqiong Yin,Li Ji,Qiang Lin,Ziyu Qin
Bacterial cellulose (BC) is a form of cellulose synthesized by microorganisms, which has unique structure properties and differs from plant cellulose. Up to now, chemical modification of BC has not been studied widely. This paper aims to prepare sodium bacterial cellulose sulfate (SBS) in N,N-dimethylformamide (DMF) with a ClSO 3 H/DMF complex as the sulfating agent. SBSs with diverse degree of sulfation (DS, 0.04–0.86) were synthesized. The system could change from heterogeneous to homogeneous during the sulfation. Regarding to the DS, the optimal ClSO 3 H amount and reaction time were 6 mol/mol anhydroglucose unit and 4 h, respectively. DS increased a little when increasing the temperature, while the yield decreased significantly. SBSs with DS > 0.24 were soluble in deionized water. Carbon nuclear magnetic resonance spectroscopy revealed that the sulfation prefers to take place in the order of C-6 > C-2 > C-3. The X-ray diffraction profiles indicated that the crystalline structure of BC was destroyed during sulfation. BC has better reactivity than microcrystalline cellulose in both sulfation and depolymerization processes. SBS is a potential biomaterial. However, BC depolymerized obviously in present sulfation, which forbids application of SBS in material. Moisture of the reaction mixture should be removed as completely as possible to guarantee efficient sulfation and decrease depolymerization. Copyright © 2013 John Wiley & Sons, Ltd.
✓ 已验证
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL ENGINEERING
·
2026
·Vol. 152
·期 4
·04026004
·
IF 1.6
Beibei Kang,Chunyan Li,Yi Wu,Qian Li
In response to the high biological toxicity and difficult degradation of chemical wastewater containing dimethylformamide (DMF), this study uses electrocatalytic oxidation technology to treat it. The effects of electrode type, electrolyte type, electrode spacing, current, and solution pH on the degradation efficiency of DMF containing wastewater in electrocatalytic oxidation are investigated. By constructing an integrated machine learning model, the mechanism of multiparameter synergy is analyzed and the process limit performance is predicted. The results showed that when Ti/RuO2-IrO was used as the anode material and NaCl was used as the electrolyte, under the conditions of 9 g/LCl− concentration, 4 A current, 1 cm electrode spacing, and 8 pH value, the removal rates of TOC and TN of wastewater were 92.9% and 93.4%. In the prediction results of the integrated model, the determination coefficients for the removal rates of TOC and TN were 0.96 and 0.95, with root mean square error of 2.1% and 2.4%. The model predicted data validated the global optimality of experimental parameters, revealing that the interaction effect between current intensity and electrode spacing can improve mass transfer efficiency by 37%, providing a quantitative control basis for process enhancement. The research results can offer technical support and theoretical reference for the treatment of DMF containing wastewater in the synthetic fiber industry.
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 142
·期 2
·e56356
·
IF 2.7
Rongying Xia,Zhixiu Yang,Dayu Sun,Ziqi Wang,Mingzhu Yao,Huijun Liu,Lei Yang,Guanghui Ma,Lijing Gao,Ruiping Wei,Guomin Xiao,Xiaomei Pan
Achieving satisfactory separation of N, N-Dimethylformamide (DMF)/water is still challenging in industrial wastewater treatment. To address this issue, a novel method involving pervaporation (PV) separation using polyvinyl alcohol/chitosan (PVA/CS) blend films is proposed. Various characterization methods confirmed the strong compatibility between PVA and CS, and the blending improved their mechanical properties and thermal stability. Heat treatment significantly reduced the swelling degree of the membranes. In a binary aqueous system with low concentrations of DMF, controlled separation can be achieved by adjusting the blending ratio of PVA to CS. The membranes exhibited preferential selectivity for DMF when the CS content is 40–75 wt%, which allowed for the concentration and recovery of DMF. At 20 °C with a feed of 10 wt% DMF solution, 2 h heat-treated PVA/CS-50 membrane exhibited the best performance, which could be attributed to its strong hydrogen bonding force, with a total flux of 484.09 g m −2 h −1 and a separation factor of 5.41 for DMF. The PVA/CS blend membranes exhibit excellent acid and alkali resistant and are promising candidates for the separation and recovery of DMF from industrial wastewater by membrane technology.
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
Advanced Optical Materials
·
2020
·Vol. 9
·期 3
·2001435
·
IF 8.286
Bo Zhou,Dong Ding,Ye Wang,Shaofan Fang,Zexiang Liu,Jian Tang,Henan Li,Haizhe Zhong,Bingbing Tian,Yumeng Shi
All-inorganic cesium lead bromide perovskites have attracted a lot of attention because of their excellent optical properties that can potentially be applied in various optical devices. However, large-scale preparation of cesium lead bromide perovskites with outstanding optical performance is still hindered by the poor solubility of CsBr in polar aprotic solvents. In this work, a water/dimethylsulfoxide (DMSO)/dimethylformamide (DMF) system is demonstrated for the synthesis of inorganic cesium lead bromide perovskites, where the introduction of water can effectively address the dissolution issue of Cs + ions. Large-scale synthesis of pure-phase emissive Cs 4 PbBr 6 with a product yield of up to 73% is achieved and the photoluminescence quantum yield of resulting product reaches as high as 76%. The origin of the light emission is further revealed by the photoluminescence evolution of the colored Cs 4 PbBr 6 single crystals. Furthermore, reversible phase transitions between Cs 4 PbBr 6 , CsPbBr 3 and CsPb 2 Br 5 are achieved by changing solely the water content, which paves the way for the recycle of the mother solution of Cs 4 PbBr 6 without generation of additional hazardous waste. The three-solvent-based synthetic approaches enable an economical, robust, and large-scale production for all-inorganic cesium lead bromide perovskites.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）