Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Kexin Zhu,Fuping Zeng,Zhihui Li,Langlang Lv,Hua Jiang,Guangzhi Chen,Xiangyu Wang,Ju Tang
In this study, CuO-ZnO has been found to decompose sulfur hexafluoride (SF 6 ) with the activity higher than pure metal oxides (e.g. Al 2 O 3 ). After using the organic metal nanocage ZIF-8 as a precursor, the resulting CuO-ZnO particles exhibit uniform nanoscale size and possess an excellent surface area. When these particles are mixed with CaO and reacted with SF 6 at 600 °C and 0.2 MPa, a high SF 6 conversion rate of up to 99 % is achieved, with SO 2 making up about 98 % of the sulfur-containing products. Besides, the reaction demonstrates excellent degradation efficiency and maintains good stability over a continuous 78-hour operation. The results indicate that the CuO-ZnO particles provide abundant active sites that promote SF 6 adsorption and bond cleavage. Meanwhile, CaO helps disperse the CuO-ZnO particles, inhibits sintering, and provides an oxygen source for SO 2 formation, while also facilitating the fixation of fluorine, thereby enhancing both the selectivity and stability of the reaction. In addition, we also found that NH 3 is more conducive to promoting the decomposition of SF 6 by CuO-ZnO, whereas O 2 inhibits the progression of this reaction. Considering the global warming potential and long-term environmental impact of SF 6 , the proposed approach shows high degradation efficiency, excellent stability, and selectivity, contributing to mitigating the negative impact of SF 6 on global climate change.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Changdie Cao,Yali Zhao,Yurun Dai,Yanying Wei,Qibin Xia,Haihui Wang
Sulphur hexafluoride (SF 6 ) is a commonly utilized insulation gas in electrical equipment because to its superior insulating capabilities and arc extinguishing characteristics, which holds high recycling value and necessity from the economic and environmental perspective. However, traditional method of recovering SF 6 based on cryogenic distillation is energy consuming, alternative separation technic is urgently required. Herein, a variety of ZIF-8 membranes fabricated via fast current-driven synthesis are proposed for N 2 /SF 6 separation. For a typical insulation gas in gas insulated switchgear comprising 70 % N 2 and 30 % SF 6 , the ZIF-8 membrane presents a N 2 /SF 6 selectivity up to 809 and a high N 2 permeance of 557 GPU with outstanding pressure resistance, which indicates that the ZIF-8 membrane separation would be an excellent new route for highly efficient SF 6 recovery.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2020
·
IF 16.602
Huajin He,Fucheng Ren,Jianping Zhu,Yuxuan Xiang,Bizhu Zheng,Sheng Li,Shijian Chen,Yixiao Li,Qi-Hui Wu,Yong Yang
Li-SF 6 battery has been proposed as a novel energy conversion device for both reducing greenhouse-effect SF 6 and potentially providing large specific energy . However, the real discharge process of SF 6 remains ambiguous with fast cathode passivation and large polarization. Here we report that the Li-SF 6 chemistry is able to deliver an unprecedented capacity of >20,000 mA h g c −1 with reduced polarization and excellent rate capability by using a low-cost, high-surface-area porous carbon as cathode host. More importantly, by adjusting the SF 6 atmosphere, an approximately eight-electron transfer process with predominant products of LiF and Li 2 S is realized via two voltage steps, whereas previously only a little Li 2 S could be found with one plateau appearing. The eight-electron process leads to a high energy density about 2,300 W h kg −1 based on the mass of carbon and discharge products, which sheds light on SF 6 as a promising high-energy-density cathode.
研究领域:
能量转换
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电化学
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材料科学
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环境科学
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电源技术
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Hairui Fang,Hong Chen,Feng Zhang,Rong Tan,Chenshuai Han,Xin Ai,Xiao Ma,Yiwen Cui,Dong Wang
Sulfur hexafluoride (SF 6 ) from Gas Insulated Switchgear (GIS) will decompose and produce hydrogen sulfide (H 2 S) in the event of equipment failure. Therefore, the detection of H 2 S can determine whether the equipment has malfunctioned. Due to the low concentration of the SF 6 decomposition product H 2 S and its application in industrial environments, sensors must have a low detection limit and rapid response time . Considering that the oxides of rare earth elements can improve the sensing characteristics, praseodymium oxide (Pr 6 O 11 )-indium oxide (In 2 O 3 ) was prepared. The impact of Pr 6 O 11 doping on In 2 O 3 was investigated through characterization methods. To validate its feasibility for use in GIS, the best sensor (F3) exhibits good sensing characteristics for H 2 S in the SF 6 and air ambient. The responses to 10 parts per million (ppm) H 2 S at 190°C were 146.6 in SF 6 and 190.8 in air. In SF 6 ambient, the F3 sensor demonstrated a low detection limit (50 parts per billion (ppb)). The good sensing characteristics are attributed to the doping of rare earth elements, which induces an increase in the proportion of defect oxygen and accelerate the chemical reaction. The sensing characteristics of the material can be attributed to the doping of Pr 6 O 11 and the electronic effect. This study provides a novel approach for detecting H 2 S generated from SF 6 decomposition.
研究领域:
材料科学
·
电气工程
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Wufeng Wu,Changdie Cao,Yali Zhao,Qibin Xia,Yanying Wei
Sulfur hexafluoride (SF 6 ) is widely utilized as an insulating gas in power systems because of its outstanding dielectric insulation and arc-quenching properties, which presents significant value and necessity for recycling from both environmental impact and economic benefit. However, conventional thermally driven methods for SF 6 recovery suffer from high energy consumption, urgently necessitating the development of alternative separation techniques that operate under ambient conditions and reduce energy consumption. Herein, a stiffer EZIF-8 is employed as fillers in mixed matrix membranes (MMMs) for efficient SF 6 recovery. EZIF-8 is synthesized under an electric field, which is mainly composed of ZIF-8_ Cm phase. The fabricated MMMs exhibit an excellent N 2 /SF 6 selectivity of 182 with N 2 permeability of 278 Barrer, showing an 18-fold improvement in selectivity compared to that of the pure polymer membranes. Importantly, for both typical insulation gas mixture (70 % N 2 /30 % SF 6 ) commonly used in gas insulated switchgear and 100 h long-term operation, the MMMs are able to maintain steady operation with a relatively high N 2 permeability and N 2 /SF 6 selectivity, demonstrating the promising potential for the efficient recovery of SF 6 especially at low concentrations.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
SENSORS
·
2018
·Vol. 18
·期 10
·3493
·
IF 2.475
Yingang Gui,Xiaoxing Zhang,Peigeng Lv,Shan Wang,Chao Tang,Qu Zhou
SF6decomposition components detection is a key technology to evaluate and diagnose the insulation status of SF6-insulated equipment online, especially when insulation defects-induced discharge occurs in equipment. In order to detect the type and concentration of SF6decomposition components, a Ni-modified carbon nanotube (Ni-CNT) gas sensor has been prepared to analyze its gas sensitivity and selectivity to SF6decomposition components based on an experimental and density functional theory (DFT) theoretical study. Experimental results show that a Ni-CNT gas sensor presents an outstanding gas sensing property according to the significant change of conductivity during the gas molecule adsorption. The conductivity increases in the following order: H2S > SOF2> SO2> SO2F2. The limit of detection of the Ni-CNT gas sensor reaches 1 ppm. In addition, the excellent recovery property of the Ni-CNT gas sensor makes it easy to be widely used. A DFT theoretical study was applied to analyze the influence mechanism of Ni modification on SF6decomposition components detection. In summary, the Ni-CNT gas sensor prepared in this study can be an effective way to evaluate and diagnose the insulation status of SF6-insulated equipment online.Keywords:SF6decomposition components;carbon nanotube sensor;Ni modification;adsorption;DFT calculations
研究领域:
材料科学
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电气工程
·
理论化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small
·
2021
·Vol. 17
·期 47
·2103778
·
IF 13.281
Huajin He,Ying Liao,Wenhua Zuo,Guochang Li,Jiabao Gu,Yixiao Li,Zheng Hu,Yong Yang
Reducing SF 6 (as gas cathode) in Li batteries is a promising concept for the double benefit of mildly converting greenhouse SF 6 and providing a high theoretical energy density of 3922 Wh kg −1 . However, the reduction process is hampered by its sluggish kinetics. Here, cobalt phthalocyanine (CoPc) molecules immobilized on porous carbon matrix are, for the first time, introduced to the Li SF 6 chemistry to deliver an enhanced energy density. It is revealed that the high redox potential of Co(II)Pc/[Co(I)Pc] − (≈2.85 V) facilitates the formation of Co(I) N 4 sites to catalyze the SF 6 electrochemical reduction. By using highly porous holey nitrogen-doped carbon nanocages as carbon matrix, the Li SF 6 cells deliver a high discharge voltage of 2.82 V at 50 mA g C+CoPc −1 and an unprecedented areal capacity of 25 mAh cm −2 at 0.1 mA cm −2 , much superior to previous results. This work opens up new possibilities for high-efficiency conversion of SF 6 in lithium batteries.
研究领域:
材料科学
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电化学
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环境科学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Shuang Ni,Li Xu,Xi-Ting Zhang,Shao-Min Wang,Qing-Yuan Yang
Efficient and economical capture and separation of sulfur hexafluoride (SF6) are critical for emissions mitigation and industrial reuse. Conventional distillation methods remain energy-intensive, prompting the need for cost-effective alternatives. Here, MOF-303, constructed from earth-abundant aluminum and low-cost linkers, features optimally sized pores (8.3 Å) that selectively adsorb SF6 (5.5 Å) over N2 (3.6 Å). This rational pore engineering enables MOF-303 to achieve benchmark SF6 capture (1.91 mmol g–1 at P < 0.1 bar) with exceptional selectivity (148), while its low regeneration energy (22.9 kJ mol–1) ensures practical cycling. Breakthrough experiments confirm robust performance under dynamic conditions. Computational studies reveal how pore geometry enables size-exclusive recognition. Compared to noble-metal adsorbents, MOF-303’s earth-abundant components reduce costs by >70%, offering a sustainable solution for industrial SF6 recovery.
研究领域:
环境科学
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材料科学
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化学工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Qiaobo Liao,Haocheng Xu,Can Ke,Yiying Zhang,Qingwen Han,Yifan Zhang,Yang Xu,Ding Wang,Kai Xi
Sulfur hexafluoride (SF 6 ) is the most potent greenhouse gas whose emission is in great need of reduction during industrial processes. Here, a variety of imine-linked covalent organic frameworks with varying surface areas, pore size distributions, and topologies are rationally designed and regulated for systematically studying structure–property relationships of COF-based SF 6 adsorbents. In terms of imine-linked COFs without further modification, the surface area was found to be a prerequisite for achieving high SF 6 uptakes, and a small pore size at ca. 0.9 nm could effectively strengthen the adsorbate-adsorbent interaction and hence enhance the SF 6 /N 2 selectivity. With a large specific surface area, suitable pore size, and strong covalent bonds, RCOF-1 showed superior SF 6 adsorption capacities up to 4.13 mmol g −1 and large SF 6 /N 2 selectivity up to 125 (273 K, 100 kPa) accompanied by excellent stability, which can be considered one of the most high-performance porous materials for SF 6 capture and separation. This work not only provides a series of high-performance SF 6 adsorbents but also broadens the horizon of applications of the emerging COFs, pointing out their development direction in the field of SF 6 capture and separation.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Environmental Science-Nano
·
2023
·Vol. 11
·期 1
·459-469
·
IF 7.3
Hu Meng,Zhiwen Liu,Xiaoxin Wang,Liang Feng
Compared with carbon dioxide, fluorinated greenhouse gases (F-type gases), such as hydrofluorocarbons (HFCs), perfluorocarbons (PFCs) and sulfur hexafluoride (SF6), have a stronger greenhouse effect, and their global warming potential can reach thousands or even tens of thousands of times that of carbon dioxide. Thus, the rapid online accurate detection of fluorinated greenhouse gases is highly desired and it can provide a basis for the evaluation of the greenhouse effect and a yardstick for the formulation of emission reduction measures. Unfortunately, these highly noble chemical gas molecules, especially at trace concentration levels, are extremely difficult to detect with conventional rapid screening methods. The use of the most common gas sensing techniques, semiconducting metal oxides, in the detection of HFCs and PFCs has not appeared within the scope of our knowledge. Herein, we report a novel N-doped tin oxide semiconducting metal oxide prepared by using a facile hydrothermal method. The experimental characterization results showed that the as-prepared materials were uniform spherical nanoparticles. The doping ratio of N-doped tin oxide was further optimized, and gas-sensing tests using these materials were carefully conducted. The results showed that the sensor had good detection performance for F-type gases, represented by SF6, C2F6 and C2H2F4, including low working temperature (200 °C), high selectivity, good repeatability, relatively high response, and low limit of detection (LOD ∼7 ppb). To the best of our knowledge, this is the first report on an F-type gas sensor based on semiconductor metal oxide. The ultra-fine particle size and uniform morphology of spherical particles, high concentration of oxygen vacancy defects and N doping contribute to the excellent performance of the sensor.
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
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Wenhui Zhou,Yue Zhao,Boxu Dong,Hongran Guo,Ziqi Si,Fengxiang Ma,Shan Zhu,Jiantao Zai,Xuefeng Qian
Sulfur hexafluoride (SF 6 ), widely used in industries, poses a significant threat as the strongest greenhouse gas. Current methods for degrading SF 6 are hindered by high energy consumption and costs, thus there is an urgent need for a low-cost, convenient, and efficient solution. In response, we established a gas-liquid-solid three-phase (GLS) system for efficient photocatalytic SF 6 degradation by Bi 2 O 2 CO 3 , whose efficiency was approximately 20 times that of traditional gas-solid systems. Further, possible degradation mechanisms were demonstrated through the detection of material changes in three phases, respectively. Detailed studies revealed Bi 2 O 2 CO 3 can in-situ form Bi 2 S 3 heterojunction during the reaction, facilitating carrier separation. Besides, O 2 can transform to ·O 2 − and accelerate the photodegradation process. This approach offered a novel toolbox for SF 6 degradation. We predict this method will have a wider range of applications in the field of solar-powered catalytic degradation of extremely stable fluorinated pollutants at lower costs in the future.
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
MOLECULES
·
2025
·Vol. 30
·期 7
·1481
·
IF 4.6
Wenhui Zhou,Boxu Dong,Ziqi Si,Yushuai Xu,Xinhua He,Ziyi Zhan,Yaru Zhang,Chaoyu Song,Zhuoqian Lv,Jiantao Zai,Xuefeng Qian
Sulfur hexafluoride (SF6), the strongest greenhouse gas, has great challenges in degradation because of its stable structure, posing significant environmental concerns. Photocatalysis offers an environmentally friendly, low-energy solution, but the fluoride deposition on catalysts reduces their activity, thus limiting their large-scale application. To prevent catalyst fluoride poisoning, we report a thin-layer graphitic carbon nitride (CN) material loaded with MoOx(CNM) that resists fluoride deposition for long-term SF6degradation. By combining molecular structure design and nanostructure regulation, we construct a photocatalyst with enhanced charge carrier mobility and reduced transport distances. We find that the CNM exhibits a high specific surface area, increased contact between reactants and active sites, and efficient electron–hole separation due to the Mo-N bonds, achieving an SF6degradation efficiency of 1.73 mmol/g after one day due to the prolonged catalytic durability of the catalyst, which is eight times higher than pristine g-C3N4(0.21 mmol/g). We demonstrate the potential of CNMs for low-energy, high-efficiency SF6degradation, offering a new approach to mitigate the environmental impact of this potent greenhouse gas. We envision that this study will inspire further research into advanced photocatalytic materials for environmental remediation, contributing to global efforts in combating climate change.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）