APPLIED CATALYSIS B-ENVIRONMENTAL
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2024
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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
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材料科学
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2021
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IF 3.764
Tongge Wang,Miao Chang,Tongan Yan,Yunpan Ying,Qingyuan Yang,Dahuan Liu
Sulfur hexafluoride (SF6), which has a greenhouse effect of 228 000 times more terrible than carbon dioxide, has attracted increasing attention. Its efficient capture, especially from the mixtures with low SF6 concentrations, is urgently needed while challenging. Herein, we use a calcium (Ca)-based metal–organic framework (MOF; SBMOF-1) with multiaromatic ring-functionalized channels to achieve a record selectivity as high as 727 for an industrially relevant SF6/N2 mixture (volume concentration of SF6: 0.03%) at 298 K and 1 bar. Grand canonical Monte Carlo simulations and density functional theory calculations identified that SF6 molecules were energy-favorably trapped in the functionalized MOF channels by the strong interactions between the channel walls and six fluorine atoms on SF6. Excellent breakthrough results accompanied with good stability and regenerability recommend its promising application for practical SF6 capture from low-concentration SF6 mixtures, which also provides a new benchmark for SF6/N2 separation.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
MOLECULES
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2025
·Vol. 30
·期 7
·1481
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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
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材料科学
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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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
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产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2025
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IF 3.7
Runze Dong,Wenhao Li,Qiyu Yang,Ping Li,Pan Zhang,Lemeng Wang,Dong Fu
How to achieve low energy consumption and high degradation efficiency (DRE) under mild conditions is an important issue in the field of sulfur hexafluoride (SF 6 ) treatment. In this work, a new route of SF 6 degradation promoted by Ni-doped ceria (NiO-CeO 2 ) in a packed bed dielectric barrier discharge (PB-DBD) was proposed. The effects of Ni/Ce molar ratio, input power, SF 6 concentration and flow rate on the DRE of SF 6 were investigated. Compared with DBD or CeO 2 -DBD alone, the combination of DBD and NiO-CeO 2 can significantly promote the SF 6 degradation at lower input power. The Experimental results show that when the dosage of catalyst 1.5NiO-CeO 2 (Ni/Ce mole ratio is 1.5%) is 5 g, DBD input power is 50 W and SF 6 (1.5% SF 6 /98.5% Ar) flow rate is 100 ml·min −1 , the highest DRE can reach 97.7% and the energy yield can reach 11.5 gSF 6 ·(kWh) −1 . Adjusting the catalyst dosage according to the flux of SF 6 ( e.g., using 10 g catalyst to degrade SF 6 with a concentration of 1.5% and a flow rate of 80 ml·min -1 ), the DRE of nearly 99% can be achieved for a long time, which is crucial for industrial application. The mechanism deduction shows that the rich surface and mesopores of the catalyst are beneficial to the adsorption of SF 6 and intermediates, while the doping of Ni can significantly increase the content of oxygen vacancies to improve the degradation. Meanwhile, when NiO-CeO 2 is activated by DBD, the free O· can further promote the degradation. It is this coupling effect that leads to the high efficiency and low energy consumption of SF 6 degradation under mild conditions. It can be expected that this coupling technology route will have a good application prospect in the field of SF 6 treatment.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF PHYSICAL CHEMISTRY B
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2018
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IF 3.146
Liping Han,Tao Guo,Zhen Guo,Caifen Wang,Wei Zhang,Shailendra Shakya,Huanyu Ding,Haiyan Li,Xu Xu,Yujie Ren,Jiwen Zhang
γ-Cyclodextrin metal–organic framework (γ-CD-MOF) is a new type of highly porous carrier for potential loading of therapeutic or diagnostic gas like sulfur hexafluoride (SF6). Here, loading of SF6 into γ-CD-MOF was investigated for its mechanism by molecular simulation and quantitative determination of SF6 using quantitative nuclear magnetic resonance (qNMR). For the SF6 loading, γ-CD-MOF was first degassed to remove the air without thermal decomposition or loss of framework crystallinity, then placed in the copper tube, and sealed to adsorb SF6 under 1.2 MPa and 25 °C for 12 h. The qNMR was employed for the determination of SF6 loaded in γ-CD-MOF using Span 80 as suspending agent and trifluoroacetic acid as internal standard. Then, the thermodynamic parameters had been estimated. Finally, molecular modeling combining with 19F NMR spectra was conducted to reveal the status of SF6 molecules in γ-CD-MOF. The results demonstrated that the content of SF6 loaded in γ-CD-MOF was 2.67 ± 0.46 wt %. After exposing to the environment of free SF6 at 0.1 MPa for 10 days, the relative content was 74.7%. It was confirmed that SF6 preferred to stay in the cavity of γ-CD-MOF cubes rather than in the γ-CD molecular pairs, which was a nonchemical adsorptive process. In conclusion, this research has established qNMR method and molecular simulation to demonstrate SF6 molecules in γ-CD-MOF and its loading mechanism.
研究领域:
材料科学
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医学
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化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
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IF 9.7
Bowen Zhao,Jianyi Lu,Qing Xu,Fei Zheng,Zhiyong Zhou
Owing to its strong chemical inertness, sulfur hexafluoride (SF 6 ) is intrinsically resistant to degradation. Accordingly, a composite material was developed by coupling sulfidated nanoscale zero-valent iron (S-nZVI) with fly ash-derived zeolite ZSM-5, forming a multi-level heterostructure for efficient SF 6 degradation. Experimental results confirmed that the composite exhibited exceptional low-temperature degradation performance, achieving complete removal of 2 vol% SF 6 at 600 °C with a specific degradation amount of 206.1 mL/g. Remarkably, effective degradation was still maintained at 300 °C, surpassing the previously reported minimum temperature limit (∼450 °C) for SF 6 degradation. Kinetic analysis revealed a near-zero-order reaction behavior with an apparent activation energy of only 27.61 kJ/mol, indicating that the initial stage was dominated by adsorption, diffusion, or interfacial electron transfer rather than S F bond cleavage. Comprehensive characterization showed that the composite possessed Fe 0 /FeS and FeS/ZSM-5 dual heterointerfaces, serving simultaneously as adsorption carriers, electron donors and acceptors. Specifically, the microporous framework of ZSM-5 physically confines nonpolar SF 6 molecules through van der Waals and confinement effects, enriching their local concentration and forming a favorable adsorption-activation interface. Electrons released by Fe 0 migrate directionally to these enrichment sites under the drive of the multi-level heterostructure, enabling concurrent adsorption and electron-induced activation of SF 6 , and thereby facilitating S F bond cleavage. The resulting fluoride ions initially react with Fe 0 to generate FeF 3 , which subsequently interacts with the silicate framework to produce SiF 4 , establishing a mediated fluorine migration pathway from SF 6 to SiF 4 and enabling deep degradation with sustained reactivity.
研究领域:
环境化学
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材料科学
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催化化学
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大气污染控制
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无机化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Timur Meng,Enhui Wang,Yuyue Peng,Zhiyi Li,Hongliang Lei,Saowaluk Chaleawlert-umpon,Hongmin Su,Youzhi Wang,Lina Li
Sulfur hexafluoride (SF 6 ), a crucial gas in the power and semiconductor industries, presents significant challenges for recovery and separation. This work reports the synthesis of a series of porous organic polymers (POPs) with high porosity and physicochemical stability via a Lewis acid-catalyzed slow-knitting method. Different fluorinated organic monomers were employed, using dibromomethane (DBrM) as both solvent and electrophilic cross-linker. The resulting DBrM-knitted POPs exhibited BET surface areas up to 1,408.37 m 2 /g, surpassing those of chloroform-knitted POPs by 53.51 %-160.26 %. These materials demonstrated superior SF 6 adsorption capacity, tunable via the position of fluorine groups. The optimal material achieved an SF 6 adsorption capacity of 91 ml/g at 273 K and an SF 6 /N 2 separation selectivity of 195.70. An optimal pore size of 0.73 nm was identified for SF 6 adsorption and separation. These findings contribute significantly to the development of advanced porous materials for efficient SF 6 recovery.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
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2025
·Vol. 16
·期 1
·1-11
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IF 15.7
Li Jinjian,Chen Yuting,Ke Tian,Jin Yuanyuan,Fan Rongrong,Xu Guihong,Yang Liu,Zhang Zhiguo,Bao Zongbi,Ren Qilong,Yang Qiwei
Physisorption presents a promising alternative to cryogenic distillation for capturing the most potent greenhouse gas, SF 6 , but existing adsorbents face challenges in meeting diverse chemical and engineering concerns. Herein, with insights into in-pore chemistry and industrial process design, we report a systematic investigation that constructed two low-cost composites pellets (Al(fum)@2%HPC and Al(fum)@5%Kaolin) coupled with an innovative two-stage Vacuum Temperature Swing Adsorption (VTSA) process for the ultra-efficient recovery of low-concentration SF 6 from N 2 . Record-high selectivities (> 2×10 4 ) and SF 6 dynamic capacities (~ 2.7 mmol/g) were achieved, while exceptional SF 6 productivities (~ 58.7 L/kg), yields (~ 96.8%), and recyclability (~ 1000 cycles) were demonstrated in fixed-bed adsorption-desorption experiments under mild regeneration conditions. 2D solid-state NMR/in-situ FTIR, DFT-D binding/diffusion simulation analyses revealed the multi-site binding mode and the ultra-fast diffusion of SF 6 within the channels. The proposed VTSA processes successfully met the dual stringent requirements of both environmental protection and electricity equipment operation: the SF 6 recovery of 99.91% accompanied with a SF 6 purity/working capacity of 99.91%/2.1 mmol/g, which significantly outperformed the industrial employed adsorbent zeolite 13X and showed only 18.7% the energy consumption of the cryogenic distillation.
研究领域:
材料科学
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环境工程
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Dan Baohui,Mahmood ul Haq,Salah Ud Din,Shabab Hussain,Shao Wenyi,Wu Jingmin,Chi Hanwen,Zhizhen Ye,Liping Zhu
The SF 6 gas in gas-insulated switchgear (GIS) systems decomposes into SO 2 F 2 , SOF 2 , SO 2 , and H 2 S under abnormal conditions such as partial discharge. The detection of these decomposition gases with high sensitivity is essential for the safe operation of GIS devices. Herein, we report the synthesis of cerium oxide and multiwalled carbon nanotube composite (CeO 2 @MWCNTs). The CeO 2 @MWCNTs composite was characterized by X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, transmission electron microscopy , X-ray photoelectron spectroscopy, and Brunauer–Emmett–Teller analysis. The CeO 2 @MWCNTs composite sensor provided a response value of 7.7 at 100 ppm of SO 2 F 2 at a low operating temperature (50 °C), and the response and recovery features of the CeO 2 @MWCNTs composite sensor were recorded at 43 and 28 s, respectively. Moreover, the composite sensor exhibited excellent stability after two months. The developed CeO 2 @MWCNTs composite sensor can offer an exceptional platform for gas sensing applications in diverse fields.
研究领域:
材料科学
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气体传感技术
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电力设备监测
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纳米复合材料
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环境监测
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2016
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IF 4.758
Fangming Deng,Yigang He,Guolong Shi,Bing Li,Xiang Wu
Gaseous sensor system was developed for the detection of sulfur hexafluoride vapor based on its cataluminescence (CTL) emission by using coral-like Zn-doped SnO 2 composite. The test architecture, experiment characteristics and optimal conditions were studied in detail under optimized experiment conditions. Results showed that the gas sensor system covered a linear detection range from 8 mg/L to 5600 mg/L (R = 0.9963, n = 7) with a detection limit of 6.2 mg/L (S/N = 3), which was below the standard permitted concentration. The sensor showed a rapid response of 2 s and a recovery time of 30 s, respectively. Moreover, pattern recognition method was used to test the recognizable performance of this sensor, which has found that analyte can be distinguished clearly. As sensing materials for a CTL gas sensor, this coral-like Zn-doped SnO 2 demonstrates excellent CTL behavior (that is, high sensitivity, superior selectivity to sulfur hexafluoride compared with other eleven kinds of common volatile organic compounds (VOCs) as well as a fast response and recovery). The excellent sensing properties including improved sensitivity, selectivity and stability proved this sensor to be a promising candidate for detecting gas contaminants.
研究领域:
材料科学
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化学工程
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环境科学
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传感器技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）