JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 16
·A4014
·
IF 3.12
Zhiyuan Song,Xueyu Zhang,Xuesong Li,Lianfeng Duan,Wei Lü
Flexible capacitor systems with high-performance and stretchable characteristics have been widely concerned due to potential applications in portable and wearable electronics. Herein, we prepared PVA/Carbon nanotube (CNT)@Ni(HCO3)2 flexible film as supercapacitor electrodes. CNTs is used as charge transfer pathway to enhance the conductivity of polymer and double-layer capacitance. Ni(HCO3)2 decorated on CNTs provides pseudocapacitance, and PVA matrix provides bendable and stretchable ability. The device achieves a specific capacitance of 143.6 mF cm−2, and the PVA/CNT@Ni(HCO3)2 film exhibits tensile strength of 0.37 MPa with elongation at break of 450%. The flexible device with excellent stretchable and bendable ability shows an instant response to the finger bending with the capacitance change more than 35%, which provides the possibility for fabricating novel smart flexible device to monitor human health and motion detection.
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高影响因子
ENVIRONMENTAL POLLUTION
·
2024
·
IF 7.6
Cheng Wang,Shuijing Zhou,Xiaoming Wang,Wenfeng Tan,Xionghan Feng
Photo-catalyzing sulfite (S(IV)) for the generation of sulfate radical (SO 4 •- ) has emerged as a novel advanced oxidation process (AOP) recently. However, both the potential of soil minerals as effective photocatalysts and the process of water acidification due to S(IV) oxidation have been overlooked. Herein, maghemite (γ-Fe 2 O 3 ), a typical soil iron oxide with excellent photocatalytic reactivity like hematite and magnetic-collectible property like magnetite, was successfully used to activate S(IV) for iohexol degradation under visible light irradiation. As a result, 91.3% of iohexol was eliminated within 15 min at 0.1 g/L maghemite and 0.5 mM S(IV) under neutral conditions. The influencing factors, including initial pH, catalyst dosage, S(IV) amount, co-existing substances and water matrix, were systematically investigated. The maghemite/S(IV)/vis system exhibited superior performance in iohexol degradation at a wide pH range (3–10). It was found that the released proton via S(IV) oxidation led to severe water acidification. Interestingly, a low dose of HCO 3 − could evidently resist water acidification with little influence on iohexol elimination. Radical quenching experiments and electron spin resonance (ESR) analysis confirmed that SO 4 •- , •OH and •O 2 − were involved in iohexol abatement with SO 4 •- being the dominant reactive species. Compared with hydrogen peroxide, persulfate and peroxymonosulfate, the established maghemite/S(IV)/vis system achieved much more remarkable degradation performance. Furthermore, the reactivity of the catalyst was not obviously reduced even after 10 runs of reaction. This study expands the application of soil iron oxide mineral in S(IV) activation in water treatment and proposes an approach to regulate water acidification in S(IV)-based AOP.
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DOI
PubMed
高影响因子
ZEITSCHRIFT FUR PHYSIKALISCHE CHEMIE-INTERNATIONAL JOURNAL OF RESEARCH IN PHYSICAL CHEMISTRY & CHEMICAL PHYSICS
·
2020
·Vol. 235
·期 4
·451-466
·
IF 2.03
Yuli Xue,Yan Zhang,Xiaoling Tan,Wenqing Li,Zhongshu Li,Shaonan Xu,Peng Zhang,Jian Wang,Peiping Zhang,Shiding Miao
It is of importance to reclaim single-salt of potash from Li + -type brines of low concentration. In this work the potassium salts KHCO 3 was efficiently separated from the lithium carbonate-type brines with the aid of CO 2 carbonation. The phase field was provided in which the precipitation of KHCO 3 occurs and single-salt of potassium can be obtained. The low concentration of [Li + ] was also successfully concentrated to a high level (8.1 g/L), and this concentration can be used as sources for Li + -salts production using pre-developed strategies, which looks forward wider applications of the lithium resources of natural brine. This state-of-art was traced via isotherm evaporation on the quaternary system of Li + –K + –CO 3 2− –H 2 O at 298.15 K in which the carbonation steps were performed by CO 2 . Metastable phase diagram was found to consist of three invariant points, seven univariant curves, and four crystallization fields corresponding to Li 2 CO 3 , KHCO 3 , potassium carbonate sesquihydrate (K 2 CO 3 ⋅ 3/2H 2 O), and a potassium carbonate and potassium bicarbonate double salt (K 2 CO 3 ⋅ 2 KHCO 3 ⋅ 1.5H 2 O). There was no crystallization field corresponding to LiHCO 3 . The pH-composition diagram and density-composition diagram were also plotted. This work was carried out in aim of extracting/separating single salts of alkali metals from carbonate-type brines of west China.
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高影响因子
MOLECULES
·
2024
·Vol. 29
·期 3
·659
·
IF 4.2
Zedian Li,Liangrui Xiang,Shijia Pan,Dahai Zhu,Shen Li,He Guo
This research constructed a novel O3/CaO2/HCO3−system to degrade antibiotic oxytetracycline (OTC) in water. The results indicated that CaO2andHCO3−addition could promote OTC degradation in an O3system. There is an optimal dosage of CaO2(0.05 g/L) andHCO3−(2.25 mmol/L) that promotes OTC degradation. After 30 min of treatment, approximately 91.5% of the OTC molecules were eliminated in the O3/CaO2/HCO3−system. A higher O3concentration, alkaline condition, and lower OTC concentration were conducive to OTC decomposition. Active substances including ·OH,1O2,·O2−, and ·HCO3−play certain roles in OTC degradation. The production of ·OH followed the order: O3/CaO2/HCO3−> O3/CaO2> O3. Compared to the sole O3system, TOC and COD were easier to remove in the O3/CaO2/HCO3−system. Based on DFT and LC-MS, active species dominant in the degradation pathways of OTC were proposed. Then, an evaluation of the toxic changes in intermediates during OTC degradation was carried out. The feasibility of O3/CaO2/HCO3−for the treatment of other substances, such as bisphenol A, tetracycline, and actual wastewater, was investigated. Finally, the energy efficiency of the O3/CaO2/HCO3−system was calculated and compared with other mainstream processes of OTC degradation. The O3/CaO2/HCO3−system may be considered as an efficient and economical approach for antibiotic destruction.
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DOI
PubMed
高影响因子
Catalysis Science & Technology
·
2024
·Vol. 14
·期 4
·990-998
·
IF 4.4
Huichao He,Jinyu Wen,Qiwen Chen,Hai Yu,Kun Liu,Tao Han,Xiaoyan Liu,Gaili Ke,Yutong Li,Huaming Yang
The catalytic activation of HCO3−/H2O2 to generate reactive oxygen species could treat neutral or weak alkaline organic wastewater effectively. Based on the activation principle of HCO3−/H2O2 and the advantages of natural tourmaline, four types of common tourmaline powders were investigated as catalysts to activate HCO3−/H2O2 for the degradation of typical anionic (methyl orange: MO) and cationic (methylene blue: MB; rhodamine B: RhB) dyes in aqueous solution. Compared to magnesium-rich tourmaline, lithium-rich tourmaline and low Fe content tourmaline, higher activity was observed for high Fe content tourmaline (high-Fe TM) in the catalytic activation of HCO3−/H2O2 to achieve dye degradation. Furthermore, high-Fe TM exhibited acceptable stability for activating HCO3−/H2O2 for the degradation of dyes, and the co-existing ions in municipal tap water, temperature and pH had a weak influence on the catalytic activity of high-Fe TM. The degradation of dyes in the high-Fe TM/HCO3−/H2O2 system was found to be initiated by typical reactive oxygen species, which are mainly originated from the catalytic activation of HCO3−/H2O2 with high-Fe TM. Specifically, the Fe-based sites of high-Fe TM and the Fe ions dissolved with high-Fe TM co-activated HCO3−/H2O2 through heterogeneous and homogeneous catalysis, respectively. The degradation of RhB was driven by ˙OH and ˙O2−, and the degradation of MB and MO was initiated by 1O2.
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高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Bo Lv,Xuefan Feng,Xinyan Feng,Xiaoming Wang,Zhenyu Yuan,Bowen Xu,Yu Yang,Fuqin Zhang
Using photocatalysts to produce hydrogen from photocatalytic water splitting is a green approach for producing renewable energy with minimum environmental impact. The key to the success of this technology is to develop an efficient hydrogen production catalyst with stable performance. In this work, we report a simple two-step preparation of zinc carbonate modified with Cd 0.5 Zn 0.5 S/Ni(HCO 3 ) 2 composite. The participation of Ni(HCO 3 ) 2 co-catalyst improved the visible light activity, which also irreversibly inhibited the recombination of holes and electrons. Meanwhile, the novel 0D and 2D heterojunctions are responsible for the excellent catalytic performance with superior stability. The catalytic hydrogen production reached the best rate of 64 mmol/g/h with the cumulative hydrogen production of 320 mmol/g in 5 h, which is even better than that from the photocatalysts activated with the precious metal, Pt. The underlying mechanism was rationalized by the hydrogen evolution kinetics analysis. The excellent hydrogen production performance, presented in this work, demonstrated that the composite of zinc carbonate modified with Cd 0.5 Zn 0.5 S/Ni(HCO 3 ) 2 is a promising, economical and efficient choice of the photocatalyst.
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高影响因子
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