FUEL
·
2022
·
IF 8.035
Zhanshi Ni,Haobo Bi,Chunlong Jiang,Hao Sun,Wenliang Zhou,Zhicong Qiu,Qizhao Lin
Faced with increasingly severe environmental and energy issues, the development and utilization of solid waste have become a trend. In this study, a thermogravimetric-Fourier infrared spectrometer-mass spectrometer (TG-FTIR-MS) was used to carry out the co-pyrolysis experiment of coal slime and cellulose. The samples with mass mixing ratios of 0:10, 1:9, 3:7, 5:5, 7:3, 9:1, and 10:0 were pyrolyzed in N 2 atmosphere. The percentages of mass loss during the pyrolysis of coal slime and cellulose were 15.69 and 94.28%, respectively. The addition of cellulose to the coal slime could significantly improve the pyrolysis performance of the sample. It was detected by FTIR that the pyrolysis of the blends mainly formed C=O-containing compounds. MS was used to monitor the ion current intensity of gaseous products of sample pyrolysis online. The average activation energy of the reaction between coal slime and cellulose calculated by the Kissinger-Akahira-Sunose method were 237.59 kJ/mol and 174.06 kJ/mol, respectively. The principal component 1 and principal component 2 dominated the co-pyrolysis process of coal slime and cellulose. The MAE, RMSE, and R 2 of the artificial neural network prediction model for predicting the pyrolysis process of the sample were 0.5249, 0.8244, and 0.9994, respectively. This research provided basic theory and data support for understanding the co-pyrolysis of coal slime and biomass.
研究领域:
能源化学
·
环境科学
·
热化学转化
·
可再生能源
·
固体废物利用
✓ 已验证
DOI
高影响因子
Catalysts
·
2020
·Vol. 10
·期 3
·331
·
IF 3.52
Ergang Yao,Siyu Xu,Fengqi Zhao,Taizhong Huang,Haijian Li,Ningning Zhao,Jianhua Yi,Yanjing Yang,Changjian Wang
The fiber-like bis-(dimethylglyoximato) nickel(II) complex, Ni(DMG)2was successfully synthesized. The obtained samples were characterized by SEM-EDS, FT-IR, XRD, and XPS. The TG-DSC-FTIR-MS coupling technique was used to characterize the thermal decomposition behavior and evolved gas analysis of Ni(DMG)2. The non-isothermal decomposition reaction kinetic parameters were obtained by both combined kinetic analysis and isoconversional Vyazovkin methods. It was found that Ni(DMG)2begins to decompose at around 280 °C, and a sharp exothermic peak is observed in the DSC curve at about 308.2 °C at a heating rate of 10 °C·min−1. The main gaseous products are H2O, NH3, N2O, CO, and HCN, and the content of H2O is significantly higher than that of the others. The activation energy obtained by the combined kinetic analysis method is 170.61 ± 0.65 kJ·mol−1. The decomposition process can be described by the random nucleation and growth of the nuclei model. However, it was challenging to attempt to evaluate the reaction mechanism precisely by one ideal kinetic model.Keywords:nickel (II) complex;dimethylglyoxime;thermal behavior;kinetic analysis;combustion catalyst
研究领域:
材料科学
·
化学动力学
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产品关联
DOI
高影响因子
AICHE JOURNAL
·
2025
·
IF 4
Hui Wang,Yifan Jin,Yaxin Jin,Siyu Kuang,Tianxiang Yan,Xinyue Wang,Xiao Wang,Wenquan Cui,Sheng Zhang
Electrochemical carbon dioxide reduction reaction (CO 2 RR) is one of the most prospective strategies to achieve carbon neutrality. Multi-carbon compound (C 2+ ) products have higher commercial value and wider applications, among which ethanol is a widely used chemical feedstock and high energy density fuel. Here, we prepared nitrogen-doped carbon nanofibers containing copper-zinc double atoms using the electrospinning technique and controlled the content of both metal atoms by varying the calcination temperature. This catalyst exhibited ultra-high selectivity for ethanol at low potentials. Ethanol selectivity at −0.3 V versus RHE was more than 60% with the total alcohol selectivity of over 80%. Meanwhile, we explored the ethanol production pathway by combining density-functional theory (DFT) and ATR-FTIR spectroscopy, and found that OCCO* intermediates were most abundant for the optimal ratio of Cu to Zn atoms, lowering the energetic barriers to ethanol formation, and thus improving the selectivity of ethanol production.
研究领域:
材料科学
·
催化化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Soft Matter
·
2015
·Vol. 11
·期 35
·7059-7065
·
IF 4.029
Lei Hou,Peiyi Wu
The UCST-type transition of poly(acrylamide-co-acrylonitrile) (P(AAm-co-AN)) (molar fraction of AN: 13.3%; PDI = 3.2) in H2O and D2O is explored and compared by applying turbidity, DLS as well as FTIR measurements. The transition temperature of P(AAm-co-AN) in D2O is observed to be almost 10 °C higher than that in H2O at the same concentration, demonstrating a dramatic solvent isotope effect. Such a phenomenon could be rooted from a stronger interaction among polymer chains in D2O than in H2O, as indicated from DLS results. It is also observed in second-derivative analysis of FTIR spectra in the ν(CO) region, where all CO groups participate in the formation of inter-/intra-chain hydrogen bonds (CO⋯H–N) in D2O while there is still part of relatively “free” CO groups in H2O. Moreover, we find in the temperature-dependent FTIR spectra that CN groups exhibit hydrating behavior while CO groups present increased inter-/intra-molecular hydrogen bonding interaction (CO⋯H–N) upon cooling, revealing the later process to be the driving force of the UCST-type transition.
研究领域:
高分子化学
·
物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTEGRATED FERROELECTRICS
·
2018
·
IF 0.367
Xiaolei Song,Yuan Yu,Chunxia Wang,Mingqiao Ge
Magnetic nanoparticles of Nd-Fe3O4 were prepared by hydrothermal synthesis method, using NdCl3·6H2O and FeCl3·6H2O as the starting materials in this paper. The structure and morphology of nanoparticles were investigated by XRD, FTIR, EDS and TEM. The results showed that, while the addition of Nd at 10% in mole ratio, resulted in the formation of Nd2O3 crystal peak in cubic Fe3O4 nanocrystallites by XRD. The absorption bands of Fe‒O, ‒OH, ‒O‒C‒O‒ and ‒CH2‒ were accordant to the correspondent chemical groups by FTIR. The morphology of the prepared nanoparticles exhibited spherical structure and evenly distributed without agglomeration phenomenon by TEM. The elemental composition were mainly consistent with the precursor materials used in the experiment.
研究领域:
材料科学
·
纳米技术
·
化学
✓ 已验证
产品关联
DOI
高影响因子
THERMOCHIMICA ACTA
·
2023
·
IF 3.5
Yongchen Zhu,Jianwei Zhang,Weidong He
5-Amino-1H-tetrazole (5-ATZ), an environmentally friendly energy-containing material for new propellants, is gradually applied in high-energy propellants and its ionic salt compounds have received wide attention. This study focused on investigating the interaction mechanism of guanidinium-5-aminotetrazole (GA) and nitrocellulose (NC) by kinetic methods and TG-DSC-FTIR analysis. DSC and TG experiments indicated that there was a certain interaction during the pyrolysis process of NC and GA. Comparing the kinetic models of NC and peak 3 in NC-GA, it can be found that the addition of GA mainly affected the m-value and contribution in the second step B→C, and the mechanism function changed from F n to C n,m. TG-DSC-FTIR experiments indicated that the initial decomposition product of NC, NO 2 , participated in the thermal decomposition process of GA, and the two reacted chemically to form CO, N 2 O, which made NO 2 unable to completely oxidize the skeleton of NC to produce CH 2 O, HCOOH.
研究领域:
化学
·
材料科学
·
能源与推进剂研究
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2025
·
IF 6.2
Donghua Xu,Yibing Wei,Haoyu Xiao,Tengyue Zhang,Zichun Sheng,Haiping Yang,Yingquan Chen,Xianhua Wang,Hanping Chen
Pyrolysis mechanisms of nitrogen (N)-containing plastics hold significant importance for recovering high-value fuels and chemicals from real plastic waste, whereas current insights remain unclear. This work systematically investigated the pyrolysis behaviors, volatile release characteristics, and backbone decomposition mechanisms of polyamide 6 (PA6), thermoplastic polyurethane (TPU), and polyacrylonitrile (PAN) through integrating TG-FTIR-GC/MS and density functional theory (DFT). Kinetic analysis based on Coats-Redfern and Achar methods suggested a higher average activation energy of PA6 (228 kJ/mol) compared to TPU (94 kJ/mol) and PAN (189 kJ/mol). PA6 pyrolysis predominantly produced c aprolactam (92.01 %) at 481 °C through the nucleophilic attack of terminal amino group on adjacent amide structure, forming a four-membered transition state with a free energy barrier of 217.0 kJ/mol. Owing to the lower bond dissociation energies (BDEs) of the acyloxy bonds in urethane groups compared to the alkoxy bonds in polyester structures, the hard and soft segments of TPU occurred sequential cracking at 358 and 448 °C, releasing 4,4’-diphenylmethane diisocyanate (85.12 %) and cyclopentanone (69.12 %), respectively. PAN backbone preferentially cleaved at mid-chain C-C bonds with lower BDEs, forming acrylonitrile dimer and monomer fragments, which coupled with each other and combined with hydrogen radicals to generate abundant NH 3 and fatty nitriles like 2-methylglutaronitrile, 1,3,6-hexanetricarbonitrile, and acrylonitrile. These findings elucidated the intrinsic connection between pyrolysis volatile evolution and backbone degradation mechanisms of N-containing plastics at the molecular level, thereby offering theoretical guidance for optimizing the pyrolysis process of real plastic waste to prepare high-value products.
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2026
·
IF 6.1
Hui Ma,Shaobing Yang,Yuanzhong Wang
The nine-steaming and nine drying process is the traditional preparation method for Polygonatum sibiricum , involving repeated steaming and drying nine times to optimize its dual medicinal and edible value, making it the preferred technique. Though costly, unscrupulous merchants cut corners by reducing production steps to lower costs, yet the differences are nearly undetectable to the naked eye. Therefore, it is urgently necessary to establish a rapid and accurate identification method. This study employed a combination of Fourier transform near-infrared (FT-NIR) spectroscopy and attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy with deep learning to identify nine processed samples of nine steaming and nine drying of Polygonatum kingianum . The results demonstrated that the residual neural network (ResNet) model based on synchronous two-dimensional correlation spectroscopy (2DCOS) images exhibited stable performance and high accuracy. Both the test set and training set achieved an accurate rate of 100 %. Subsequently, to explore the critical factors in different treated samples, we employed principal component analysis (PCA) to interpret the spectral variables and identified that the key variables were related to carbohydrates. Therefore, we analyzed the sugar metabolites of nine treatments using gas chromatography-mass spectrometry (GC-MS) and identified d -Xylulose, d -Ribose, d -Arabinose, and l -Rhamnose as the key metabolites distinguishing the ninth steaming of Polygonatum kingianum . Ultimately, the rapid identification of Polygonatum kingianum processed by the traditional “nine steaming and nine drying” method based on FTIR and deep learning was achieved, and its identification features were analyzed using metabolomics.
✓ 已验证
DOI
PubMed
高影响因子
EUROPEAN POLYMER JOURNAL
·
2014
·
IF 3.242
Bolin Li,Xiaolin Lu,Yonghao Ma,Zhan Chen
A novel thermo- and pH-responsive poly(acrylic acid) (PAA)/poly(4-vinylpyridine) (P4VP) aqueous material with an upper critical solution temperature (UCST) was developed in this study. It was found that the formation of the aqueous complex material was caused by the deprotonation of pyridinium groups of P4VP molecules and consequent hydrogen bonding formation between pyridine and carboxylic groups. This aqueous material exhibited significant reversible transition behaviors between the turbid colloidal and transparent solution states upon altering the pH and temperature values. Furthermore, the correlation between the solution pH and the upper critical solution temperature (UCST) enables us to design responsive aqueous materials with a broadly adjustable transition temperature range.
研究领域:
高分子化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Zhao-Yun Wang,Lei Jin,Guang Li,Jia-Qiang Yang,Wei-Qing Li,DongPing Zhan,Yan-Xia Jiang,Fang-Zu Yang,Shi-Gang Sun
An organic additive, gentian violet (GVT), is explored for the first time as a novel leveler with excellent property in through-holes (THs) metallization of Cu electronic plating in acidic medium for printed circuit board (PCB) applications. Studies of galvanostatic measurements with a platinum rotation disk electrode and density functional theory calculations demonstrate that the GVT behaves the fundamental leveler's characteristics of mass transfer adsorption, and displays a strong inhibition effect on electro-reduction of cupric ions at high rotating rate. Although the adsorption ability of GVT on Cu surface is weaker than that of commercial leveler Janus Green B (JGB), the potential difference of cupric ion reduction between low and high rotating rates is larger in case of GVT than that of JGB at same current density. Cyclic voltammetry measurements indicate that the Cu amounts of cathodic deposition and that of anodic stripping tend to the same at both low and high rotating rates when GVT, Cl − , polyethylene glycol (PEG) and bis-(sodium sulfopropyl)-disulfide (SPS) coexist in the solution, demonstrating excellent synergistic action of these additives and super leveling effect. In situ FTIR spectroscopic analysis combined with cyclic voltammetry measurements illustrate that the GVT adsorbs on Cu surface and thus affects the electro-reduction of cupric ions, which reveals the very complicated synergistic actions of these additives, i.e., the adsorption ability of GVT can be slightly enhanced by Cl − , while it has been greatly enhanced in the presence of PEG which nevertheless decreases slightly the inhibition effect of PEG on electro-reduction of cupric ions; the SPS plays an antagonistic effect with GVT due to their competitive adsorption. Based on the characterization of GVT as a novel leveler, we developed a GVT-based formula of THs metallization of Cu electronic plating, and demonstrated an excellent efficiency of a throwing power of 97.6% at 10 mA·cm −2 in a real PCB THs metallization of Cu electronic plating.
研究领域:
材料科学
·
电化学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
Metals
·
2025
·Vol. 15
·期 7
·815
·
IF 2.5
Feng Jiang,Pengyuan Wang,Jiaxing Qi,Wei Sun,Yulin Zhou,Weishang Zhao,Shuai He,Yuanjia Luo,Honghu Tang
The efficient separation of antimonate minerals from quartz remains a significant challenge in mineral processing due to their similar surface properties and strong hydrophilicity. This study explored the application of sodium dodecyl sulfonate (SDS) as a selective collector for antimonate–quartz flotation separation. Micro-flotation tests demonstrated that SDS achieved optimal recovery of antimonate minerals (90.25%) at pH 8 with a dosage of 70 mg/L, while quartz recovery remained below 10%. Contact angle measurements revealed a significant increase in the hydrophobicity of antimonate minerals after SDS treatment, whereas quartz remained highly hydrophilic. FTIR and XPS analyses confirmed the selective chemisorption of SDS on antimonate mineral surfaces through Sb-O-S bond formation, while negligible adsorption occurred on quartz. Adsorption isotherms further showed the higher SDS uptake on antimonate minerals compared to quartz. These findings collectively demonstrate the effectiveness of SDS as a selective collector for the flotation of antimonate minerals, providing a promising approach to enhancing the recovery of fine antimonate particles.
研究领域:
矿物加工
·
表面化学
·
浮选化学
·
资源回收
·
胶体与界面科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2022
·
IF 4.598
Mingjun Lu,Rongting Guo,Wei Li,Yiju Lv,Fushun Tang,Weiyi Feng,Zheng Liu,Guo-Cheng Han,Zhihua Zhan
The interfacial characterization of the cathode material Na 2 FePO 4 F with carbon capping material Na 2 FePO 4 F@C taking bagasse as the carbon source is reported. Both the higher-capacity Na 2 FePO 4 F@C material (93 mAh/g) and lower-capacity Na 2 FePO 4 F material (10 mAh/g) showed different degrees of capacity decay during cycling. The rupture and spontaneous repair process of the solid electrolyte interface (SEI) film resulting in increased impedance and blocked charge transfer, as well as irreversible changes in the surface microstructure of the electrode material after cycling, which are responsible for the decrease in capacity. The XRD and FTIR results before and after cycling shown that the characteristic peaks of the carbon coated material Na 2 FePO 4 F@C and raw material Na 2 FePO 4 F were consistent, indicated that their functional groups and crystalline structures are not the main causes of capacity decay at low cycling times (within 50 cycles).
研究领域:
电化学
·
材料科学
·
能源存储
·
电池技术
·
界面化学
·
无机非金属材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）