FUEL
·
2020
·
IF 5.578
Yun-Fei Wang,Ling-Ban Wang,Yang Li,Jin-Xiang Gu,Chang-Yu Sun,Guang-Jin Chen,Xiao-Hui Wang,Qing Yuan,Nan Li
Methane hydrate exploitation via depressurization for a reservoir with a bottom gas-rich zone was simulated using a large-sized three-dimensional hydrate simulator. A single vertical well system and a system with a combination of vertical and horizontal wells were employed to elucidate the different effects of horizontal and vertical wells on the exploitation process. The results showed that effect of promoting gas production using a horizontal well is not obvious for a high permeability reservoir. A large exploitation temperature drop may lead to ice blockage in the pipelines, and fracturing technology was introduced to solve this blockage problem. Experiments performed above and below the freezing point inferred that the decomposition of the hydrate in different areas of the reactor was not simultaneous, according to analysis of the temperature distribution of the entire reactor during the exploitation process. For exploitation above the freezing point, temperatures in the bottom of the reactor tend to maintain a low level and work against hydrate decomposition. However, for exploitation below the freezing point, the low-temperature area in the bottom of the reactor preferentially converts to ice. Heat release and salt precipitation promoted hydrate decomposition, and the decomposition rate was significantly accelerated.
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高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2020
·
IF 2.369
Peixin Zhang,Yao Zhong,Qing Yao,Xing Liu,Yan Zhang,Jun Wang,Qiang Deng,Zheling Zeng,Shuguang Deng
Separation of a gas mixture achieved by the vacuum swing adsorption (VSA) technology is considered as an efficient and energy-saving method for Xe/Kr mixtures, but developing efficient and stable adsorbents remains challenging. Herein, we report an ultramicroporous metal–organic framework, namely, MIL-120 with a suitable pore size (5.4 Å × 4.7 Å), rich hydroxyl-decorated sites, and ultrahigh stability, which is capable of highly selective adsorption of xenon from krypton. Specifically, MIL-120 exhibits an excellent adsorption capacity of Xe up to 1.15 and 1.99 mmol g–1 at 298 K under 0.1 bar and 1 bar, respectively, and outstanding ideal adsorbed solution theory selectivity of 9.6 for the Xe/Kr mixture, which is comparable to those of benchmark porous materials. The isosteric heat of adsorption (Qst) and density functional theory calculations further confirm the stronger interaction of the adsorbent toward Xe than Kr. Furthermore, the cycling breakthrough experiments, hydrothermal and acid-based stability tests, and VSA assessment comprehensively demonstrate that the MIL-120 is an efficient and potent adsorbent for Xe/Kr separation under industrial conditions.
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高影响因子
Journal of CO2 Utilization
·
2019
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IF 5.189
Jing Chang,Chengming Hou,Donghai Wan,Xiuli Zhang,Bin Xu,Hongjing Tian,Xia Wang,Qingjie Guo
An alcoholamine, 2-[2-(dimethylamino)ethoxy]ethanol (DMAEE), was co-tethered with pentaethylenehexamine (PEHA) on the surfaces of the flue gas desulfurized gypsum (FGDG) carriers to synthesize a solid bi-amine adsorbent. The effects of temperature, loading of the blended amines, mass ratio of DMAEE to PEHA, CO 2 partial pressure on the CO 2 adsorption performance were discussed. The water of hydration contained in the FGDG carriers promoted the CO 2 adsorption capacity of the bi-amine adsorbent. Both the breakthrough time and the saturation adsorption capacity of the bi-amine adsorbent were distinctly higher than the DMAEE or PEHA singly tethered adsorbents. The adsorption capacity of the bi-amine adsorbent decreased by only 1.86% over twelve cycles. The isosteric heat of adsorption Q s t and the mean free energy of adsorption E f e was determined and both the values indicated that the adsorption was primarily chemisorption. In the kinetics analysis, Avrami model fitted best with the measured adsorption capacity. With the aid of the 13 C–NMR quantitative analysis results, the CO 2 adsorption mechanism of the bi-amine adsorbent in the presence of the water of hydration was revealed. For the bi-amine adsorbents supported on some porous carriers, FGDG particles were testified to replace up to 7 wt.% of montmorillonite clay or 7 wt.% of MCM–41 zeolite or 10.5 wt.% of ZSM–5 zeolite without any decrease in the CO 2 adsorption capacity.
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Nanomaterials
·
2022
·Vol. 12
·期 22
·4062
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IF 5.719
Bo Zhang,Shuai Zhang,Yi Xia,Pingping Yu,Yin Xu,Yue Dong,Qufu Wei,Jing Wang
Optical excitation is widely acknowledged as one of the most effective means of balancing sensor responses and response/recovery properties at room temperature (RT, 25 °C). Moreover, noble metals have been proven to be suitable as photosensitizers for optical excitation. Localized surface plasmon resonance (LSPR) determines the liberalization of quasi-free electrons in noble metals under light irradiation, and numerous injected electrons in semiconductors will greatly promote the generation of chemisorbed oxygen, thus elevating the sensor response. In this study, pure SnO2and Au/SnO2nanowires (NWs) were successfully synthesized through the electrospinning method and validated using XRD, EDS, HRTEM, and XPS. Although a Schottky barrier led to a much higher initial resistance of the Au/SnO2composite compared with pure SnO2at RT in the dark, the photoinduced resistance of the Au/SnO2composite became lower than that of pure SnO2under UV irradiation with the same intensity, which confirmed the effect of LSPR. Furthermore, when used as sensing materials, a detailed comparison between the sensing properties of pure SnO2and Au/SnO2composite toward NO2in the dark and under UV irradiation highlighted the crucial role of the LSPR effects. In particular, the response of Au/SnO2NWs toward 5 ppm NO2could reach 65 at RT under UV irradiation, and the response/recovery time was only 82/42 s, which far exceeded those under Au modification-only or optical excitation-only. Finally, the gas-sensing mechanism corresponding to the change in sensor performance in each case was systematically proposed.Keywords:Au-loaded;UV irradiation;synergistic effect;NO2;gas sensor
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PubMed
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Xinyu Liu,Jianlong Wang
The selective oxidation of ammonia to dinitrogen gas in some special wastewater is of paramount significance, but still a challenge. In this study, chlorine radical (Cl•)-mediated oxidation process was developed to realize the selective oxidation of NH 4 + -N to N 2 , in which Cl• was generated in Co 2+ /peroxymonosulfate (PMS)/chloridion (Cl − ) system. The effect of various operational parameters on the efficiency and selectivity of ammonia oxidation to N 2 was investigated, such as PMS concentration, Co 2+ concentration, Cl − concentration and pH value. The experiment results showed that Cl•-mediated NH 4 + -N oxidation reaction exhibited high NH 4 + -N removal efficiency and considerable selectivity to N 2 in the range of pH from 2.0 to 6.5. The removal efficiency of NH 4 + -N was 90.39%, and the selectivity of NH 4 + -N to N 2 achieved up to 97.16%. The possible mechanism for high efficient and selective oxidation of NH 4 + -N to N 2 was tentatively proposed. The process developed in this study could provide a novel technology for the treatment and selective oxidation of ammonium in some special types of ammonium-containing wastewater.
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PubMed
高影响因子
MATERIALS & DESIGN
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2022
·
IF 9.417
Haifeng Zhang,Yang Liu,Xueya Xu,Ting Meng,Gangwen Fu,Yong Gao,Jie Pu,Yuxuan Wang
In the past decade, single-atom and nanocluster catalysts have emerged as promising materials for high efficiency electrocatalysis, while geometric morphologies and electronic properties of the supporting substrates dramatically affect the overall electrocatalytic performances. We have constructed highly oriented nitrogen-doped carbon nanotubes on carbon cloth (V-CNTs/CC) and demonstrated it can serve as superior substrate for Pt nanoclusters that are typical electrocatalysts for hydrogen evolution reactions. Compared with Pt@CNTs/CC, the Pt@V-CNTs/CC has significantly improved electron transport and charge transfer efficiency, as well as gas diffusion capability, leading to excellent catalytic activity and stability. The V-CNTs/CC designed in this work can serve as general support for various single-atom or nanocluster catalysts for high-performance electrocatalysis.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Tieyue Qi,Jingzhao Zhang,Tong Li,Shanlong An,Qiangwei Li,Lidong Wang
Accelerating the oxidation of calcium sulfite is extremely crucial for the limestone/gypsum method of flue-gas desulfurization by enhancing the desulfurization efficiency, preventing subsequent SO 2 release, and generating pure calcium sulfate as a value-added product for downstream utilization. In this work, MnTiO 3 perovskite nanodisks with high crystallinity and good thermal stability were synthesized by a hydrothermal method. The highly stabled exposed 001 facets of the MnTiO 3 catalyst give rise to its catalytic reactivity which promote the electron transfer in sulfite oxidation process thus effectively generated reactive oxygen species ( O 2 − , OH, and SO 4 − ) to accelerate the sulfite oxidation cycle. Compared with non-catalytic oxidation reactions, the calcium sulfite oxidation rate and calcium sulfate yield were increased by 4.3 times and 34.02% by using MnTiO 3 , respectively. After four cycles, the calcium sulfite oxidation rate was only 9.57% lower than that in the first cycle, and Mn leaching was minimal. To simulate actual usage scenarios, the extrusion method was employed to prepare a molded catalyst for facile separation from the desulfurization slurry, which revealed acceptable performance at a dosage of 10 g·L −1 . The proposed MnTiO 3 perovskite catalyst is non-toxic, cost-effective, convenient to synthesize, and recyclable, providing new possibilities for sulfur reclamation during flue-gas desulfurization.
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高影响因子
JOURNAL OF SEPARATION SCIENCE
·
2023
·
IF 3.1
Huijun Liu,Baoquan Pan,Jingkun Zhang,Zhongping Huang,Pingping Li,Jian Shen
A method for the determination of five microplastics in agricultural soil was established by double-shot pyrolysis-gas chromatography combined with two-step extraction. First, polycarbonate (PC), polystyrene (PS), polypropylene (PP), and polyethylene (PE) were extracted from soil samples using a mixed solvent of cyclohexanone and p -xylene, and then PE terephthalate was extracted with m -methylphenol. Subsequently, PC and PE terephthalate were analyzed by thermochemolysis, and PE, PP, and PS were investigated by direct pyrolysis at 600°C. The linearity of the method was satisfactory for five microplastics and the correlation coefficients were higher than 0.97 in the respective concentration range. The limits of detection and the limits of quantification were 0.2–10.0 and 0.5–20.0 μg/g, respectively. The method provided recoveries of 75.1%–141.5%, with acceptable repeatability within 20.0%. It was a supplementary method for the existing characterization of microplastics in agricultural soil.
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PubMed
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2022
·
IF 5.204
Yi Xu,Zhengbai Li,Keqi Zhu,Xinyue Sun,Yujia Liu,Shenghua Xiong,Yi Wu,Yunyun Yang
It is an important research direction to improve the flame retardant properties of polymers. Benzoxazine resins have attracted a great deal of interest due to their good thermal property, but the brittleness hindered their further application. A high-toughness diamine-based polybenzoxazine/polyhexahydrotriazine interpenetrating polymer network (poly(PH-ddm)/PHT IPN) have been prepared successfully in our group. In this paper, the flame-retardant mechanism of the poly(PH-ddm)/PHT IPN was discussed. Its flammability property and the thermal decomposition mechanism were measured and analyzed with Cone Calorimeter, Thermogravimetric Analysis-Fourier Transform Infrared Spectroscopy (TGA-FTIR), and Pyrolysis-Gas Chromatography/Mass Spectrometry (Py-GC/MS). The results illustrated that little heat was released during the ignition process of the cured resin. The main gas including NH 3 and CO 2 were generated during the thermal decomposition. With the release of these self-extinguishing gas that insulate the materials from oxygen and take away the burning heat, the poly(PH-ddm)/PHT IPN with the hexahydrotriazine structure exhibits good gas phase flame retardance.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Liangyu Zhai,Gangqiang Zhu,Fei Rao,Zehan Liu,Weibin Zhang,Lujun Zhu,Xianjin Shi,Yu Huang,Yanmin Jia,Mirabbos Hojamberdiev
The detection of formaldehyde gas generally requires a relatively high temperature. It is still challenging to simultaneously possess high sensitivity and strong selectivity for the detection of low-concentration formaldehyde at room temperature . The activation energy of the reaction can be reduced by introducing oxygen vacancies or loading the metal clusters on the surface of metal oxide-based semiconductors, leading to an improvement in the performance and detection limit of the sensor. However, this approach may lead to an increased cross-sensitivity to other gases and a reduction in the selectivity of the sensors. In this study, In 2 O 3 can capture a significant amount of adsorbed oxygen by increasing the oxygen vacancies and introducing platinum nanoclusters on the surface of In 2 O 3 synthesized with a specific morphology, leading to high sensitivity and selectivity for the detection of formaldehyde gas at room temperature. The Pt-In 2 O 3 sensor exhibits a response value of approximately 38 to a concentration of 1 ppm formaldehyde gas at 20 °C. Moreover, the developed sensor demonstrates excellent performance in a complex atmosphere and exhibits good long-term stability. The achieved high sensitivity and selectivity for the detection of formaldehyde gas at low temperatures hold significant implications for research and practical applications in the field of sensors.
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高影响因子
JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
·
2023
·
IF 3
Rongrong Zhu,Yan Yuan,Rourou Qi,Jianying Liang,Yan Shi,Hongbo Weng
Diabetic kidney disease (DKD), a common microvascular complication of diabetes, currently lacks specific diagnostic indicators and therapeutic targets, resulting in miss of early intervention. To profile metabolic conditions in complex and precious biological samples and screen potential biomarkers for DKD diagnosis and prognosis, a rapid, convenient and reliable quantification method for carboxyl compounds by gas chromatography-mass spectrometry (GC–MS) was established with isobutyl chloroformate derivatization. The derivatives were extracted with hexane, injected into GC–MS and quantified with selected ion monitoring mode. This method showed excellent linearity(R 2 > 0.99), good recoveries (81.1%-115.5%), good repeatability (RSD < 20%) and sensitivity (LODs: 0.20–499.90 pg, LOQs: 2.00–1007.00 pg). Among the 37 carboxyl compounds analyzed, 12 metabolites in short-chain fatty acids (SCFAs) metabolism pathway and amino acid metabolism pathway were linked with DKD development and among them, 6 metabolites were associated with both development and prognosis of DKD in mice. In conclusion, a reliable, convenient and sensitive method based on isobutyl chloroformate derivatization and GC–MS analysis is established and successfully applied to quantify 37 carboxyl compounds in biological samples of mice and 12 potential biomarkers for DKD development and prognosis are screened.
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PubMed
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2023
·Vol. 39
·期 6
·1084-1091
·
IF 3.1
Gao Zhuangzhuang,Li Baoju,Ou Shuxian,Li Dongsheng,Fang Qianrong,Qiu Shilun,Xue Ming
M etal-organic frameworks (MOFs) are attractive in membrane separation due to their special pore structure and suitable aperture size. The fabrication of defect-free and robust MOF membranes with excellent durability is highly demanded but remains challenging. In this work, we report a one-step active γ -alumina conversion strategy for the facile and reliable fabrication of an MIL-96 membrane. In this case, the γ -Al 2 O 3 sol was dip-coated and sintered on the α -Al 2 O 3 disc as the active aluminum source and substrate for the nucleation and growth of MOF. A continuous and well-intergrown MIL-96 membrane was generated with exceptional stability due to the strong adhesion to the substrate. The resultant MIL-96 membrane yielded a satisfactory H 2 /CO 2 permselectivity and high-temperature resistance, delivering a selectivity of 12.35 with H 2 permeance of 6.20×10 −7 mol·m −2 ·s −1 ·Pa −1 at 150 °C. Moreover, the probe membrane presented remarkable durability and recyclability under harsh hydrothermal conditions. This method paves the way for constructing highly stable and selective MOF membranes and could accelerate the development of advanced membrane separation technologies for gas purification and recycling in addressing the severe energy and environmental problems.
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