RAPID COMMUNICATIONS IN MASS SPECTROMETRY
·
2018
·Vol. 32
·期 17
·1521-1528
·
IF 1.97
Sheng-Kang Wang,Xian-Yong Wei,Sheng Li,Fang-Jing Liu,Yu-Gao Wang,Zhan-Ku Li,Chong Shi,Zheng Yang,Zhi-Min Zong
Rationale Coal oxidation produces carboxylic acids (CAs), including aliphatic acids, benzoic acids, and benzenepolycarboxylic acids, which are important fine chemicals which could be used to understand the structural features of coals. However, detecting CAs usually presents great challenges due to extremely troublesome pretreatments. Therefore, it is essential to develop an analytical method for the rapid detection of CAs from coal oxidation. Methods A series of model compounds (MCs) of oxidation products and two practical samples were investigated by direct analysis in real time time-of-flight mass spectrometry (DART-TOFMS) under three different analytical conditions (ionizing gas temperature, organic solvent, and MC concentration). Results Ionizing methyl benzoate, dimethyl phthalate, and dimethyl adipate produces typical ions of methyl esters, including [M − OCH 3 ] + , [M + H] + , and [M + NH 4 ] + . In contrast, the characteristic ions generated from CAs are polymer ions, such as [2 M + NH 4 ] + , [3 M + NH 4 ] + , [4 M + NH 4 ] + , and [5 M + NH 4 ] + , indicating the strong intermolecular hydrogen-bond interaction among CAs. Conclusions Results suggest that DART-TOFMS could rapidly analyze CAs or esters in coal oxidation products according to their typical ions to further gain deep insights into the coal structure.
研究领域:
分析化学
·
能源化学
✓ 已验证
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 44
·期 6
·2228-2235
·
IF 3.069
Shengchao Hou,Yan Lv,Xueyan Wu,Jixi Guo,Qingqing Sun,Luxiang Wang,Dianzeng Jia
The fabrication of high-performance graphene aerogels by economical and efficient routes is still a challenge. Herein, we prepared ultralight, highly elastic graphene/coal oxide (GC) aerogels with low-cost and simple routes, in which coal oxide was first introduced into the skeleton of graphene aerogels to prevent the severe stacking of graphene nanosheets. After the chemical grafting of the long carbon chains, the modified graphene/coal oxide (MGC) aerogels exhibited excellent hydrophobicity (140°). The ultralight MGC showed outstanding compression performance, recovering to about 100% with the compressive strain of 95% in a dry environment. Meanwhile, the optimized amount of coal oxide could also increase the absorption capacity of the aerogel by 196-fold. Moreover, the super-absorption capacity increased by up to 387 times its own mass via further carbonation treatment. Furthermore, the obtained MGC exhibited excellent absorption reusability in absorption/combustion cycles. Additionally, the MGC can be used as an interfacial solar vapor evaporator with an efficiency of 76% under 1 sun. On the basis of the viable synthesis method, the ultralight and compressive aerogels have promising applications in organic pollution cleanup and solar steam generation.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
COMBUSTION SCIENCE AND TECHNOLOGY
·
2022
·
IF 2.133
Shibin Nie,Haoran Zhang,Chao Han,Jiayi Li,Jinian Yang,Hong Zhang,Guanglong Dai,Hailin Su
The traditional gel foam materials have achieved certain effects in preventing coal fire. However, the traditional gel foam materials commonly use chemical compounds which cause harm to the environment. Therefore, based on biomass materials such as low methoxyl pectin (LMP), calcium L-lactate (Ca-L), and biomass compound foaming agent (BF), a new eco-friendly gel foam (LMP-Ca) was prepared. The foaming performance, gelling time, stability, coal oxidation inhibition and fire extinguishing performances of LMP-Ca were systematically studied. The study shows that the gelling time of LMP-Ca with 1.2 wt% LMP, 0.075 wt% Ca-L and 0.03 wt% BF is 10 min and the half-life is up to 216 h. Moreover, the LMP-Ca has excellent film-forming performance, and the isolation film with thickness up to 2.5 mm can be formed on the surface. The coal oxidation inhibition experiment shows that LMP-Ca can effectively delay the oxidation rate of coal with the temperature rising, and the inhibition rate of CO is 72.1% at 180°C. The fire extinguishing experiment shows that the temperature of the coal treated by LMP-Ca decreases rapidly from 960 to 60°C in 20 min and to 30°C in the following 110 min without the reignition phenomenon. The result indicates that LMP-Ca has excellent fire extinguishing performance. This study is helpful to develop eco-friendly coal fire prevention and control technology, and overcome the shortcomings of traditional gel foam on environmental pollutions.
研究领域:
能源与环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Case Studies in Thermal Engineering
·
2025
·
IF 6.4
Fei Gao,Zhe Jia,Jiangnan Chang,Yuzhu Huang,Gang Bai
Antioxidant is an important material in inhibitor fire prevention technology. The efficient utilization of chemical inhibitors to maximize their antioxidant effects is of significant importance. Based on this, the inhibitory effect of antioxidants on the coal oxidation process was explored by programmed heating experiment. The difference in the inerting effect of antioxidants was analyzed by electron paramagnetic resonance spectroscopy(EPR), and the targeted inhibition effect of antioxidants on the active groups in coal was quantitatively evaluated by Fourier Transform infrared spectroscopy(FT-IR). The results are as follows: The oxidation products emitted by coal samples treated with different antioxidants reduced compared to raw coal, and the intersection temperature elevated compared to that of raw coal, indicating that antioxidants can effectively impede coal oxidation spontaneous combustion. The association between the rule of gas production and heat production in coal samples indicated that the inhibitory effect of antioxidants is generally not proportional to their inhibition life. The variation in the inerting effect of antioxidants arose from their different inerting effects on coal oxygen radicals. The inhibition efficiency of antioxidants on the active structure in coal was notably high, typically ranging from 44% to 99%. GSH and DPA showed an effective and balanced inhibitory effect on the active structure of coal. The inhibition effect of CA on various active structures was also balanced but relatively weak. Tempo and PA showed a significant influence the structures of aliphatic hydrocarbons and hydroxyl groups, but had no a notable effect on aromatic structures and oxygen-containing functional groups. The research findings can provide a theoretical foundation for selecting chemical inhibitors and developing antioxidant chemical inhibitors informed by the targeted selection of coal types.
研究领域:
物理化学
·
能源科学
·
煤矿安全
·
材料化学
·
分析化学
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燃烧学
·
环境工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）