JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Ning An,Min Zhao,Xiangyong Zheng,Qi Wang,Xianfeng Huang,Bo Sun,Yi Shen,Jun Wang,Baoliang Chen,Renlan Liu
Metal-free carbonaceous catalysts are receiving increasing attention in wastewater treatment . Here, nitrogen and sulfur co-doped carbon sphere catalysts (N,S-CSs 900 -OH) were synthesized using glucose and L -cysteine via a hydrothermal method and high temperature alkali activation. The N,S-CSs 900 -10%-OH exhibited excellent catalytic performance for the degradation of oxytetracycline (OTC). The degradation rate was 95.9% in 60 min, and the reaction equilibrium rate constant was 0.0735 min −1 ( k 0–15 min ). The synergistic effect of adsorption-promoting degradation was demonstrated in the removal process of OTC. The excellent adsorption capacity of N,S-CSs 900 -10%-OH ensured the efficient oxidation of OTC. N,S-CSs 900 -10%-OH reduced the activation energy of the OTC degradation reaction ( E a=18.23 kJ/mol). Moreover, the pyrrolic N, thiophene S and carbon skeleton played an important role in the degradation of OTC based on density function theory, and the catalytic mechanism was expounded through radical and nonradical pathways. The active species involved in the reaction were O 2 •− , 1 O 2 , SO 4 •− and •OH, of which O 2 •− was the primary reactive species. This study provides a new insight into the reaction mechanism for efficient treatment of organic pollutants using metal-free doped porous carbon materials.
研究领域:
环境科学
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催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2021
·
IF 5.876
Tingyan Lu,Qian Li,Jiawei Shao,Linlin Wang,Ruixue Pang,Xiaying Wu,Xin Hu
Backgrounds Adsorption by adsorbents is accepted as a promising technology that can efficiently separate CO 2 from flue gas. Optimal adsorption performance can be obtained by specific solid adsorbents with excellent CO 2 adsorption capacity. Methods In this work, N, S co-doped porous carbons were synthesized from polyacrylonitrile fiber by a facile synthesis process i.e. hydrothermal treatment followed by KOH activation. N, S enriched hydrochar was obtained after hydrothermal treatment of polyacrylonitrile fiber and ammonium sulfide. Further KOH activation of hydrochar obtained N, S co-doped carbons with advanced porous structure. Significant findings This series of sorbents has the highest CO 2 uptake of 3.37 and 5.23 mmol g −1 at 1 bar, 25 °C and 0 °C, respectively. Detailed investigation revealed that the mutual effects of narrow microporostiy, N and S content are responsible for the CO 2 uptake of these adsorbents. Additionally, these adsorbents also show various good CO 2 capture properties such as excellent recyclability, reasonable CO 2 /N 2 selectivity, moderate heat of adsorption, fast adsorption kinetics, and good dynamic adsorption capacity. These findings suggest that N, S co-doped porous carbons derived from polyacrylonitrile fiber are potential promising sorbents for CO 2 capture.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Qi Xia,Jinlong Hu,Qingqing Chen,Lingzhi Zhang
Selenium cathode attracts great attention due to its high theoretical volumetric capacity and better electrical conductivity than sulfur cathode. Herein, N/S co-doped microporous carbon (NS-K-PC) is designed and prepared as Se host by a spray drying process of the poly(styrenesulfonic acid)-melamine salt solution followed by carbonization and activation process. The as-prepared NS-K-PC shows a very high micropore contribution of 94.8% in the total surface area, and a total N/S heteroatom doping level of 2.5 wt% in the carbon matrix. The NS-K-PC/Se cathode delivers a high reversible capacity of 499.2 mA h g −1 at 0.1C, superior rate capacity of 324 mA h g −1 at 8C, and great cycling stability with a capacity decay of 0.081% per cycle over 500 cycles at 1C. Additionally, a comparative study demonstrates that NS-K-PC/Se cathode with the carbonate-based electrolytes exhibit better cycling stability than those with ether-based electrolytes primarily resulted from a direct solid–solid conversion of Se to Li 2 Se bypassing the formation of soluble polyselenides.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2023
·
IF 7.4
Hongmin Cui,Jinsong Shi,Jianguo Xu,Nanfu Yan,Yuewei Liu
In the current work, we proposed the use of two organic potassium salts, 4-morpholineethanesulfonic acid (MES) potassium salt and 1,4-piperazinediethanesulfonic acid (PIPES) dipotassium salt, as novel and tri-functional activators for the synthesis of N, S co-doped carbons (NSCDCs). The organic potassium salts served as activator and N/S source at the same time, allowing direct synthesis of NSCDCs with N/S free precursor. In order to verify this hypothesis, N,S free hydrochar derived from glucose was selected as the carbon source. NSCDCs with high and tunable surface area (1673–2235 m 2 /g), N content (3.44–5.80 wt%), and S content (5.26–8.72 wt%) were obtained. Physicochemical properties of the carbons were mainly decided by potassium salt and activation temperature. The NSCDCs were also investigated for their CO 2 adsorption properties. At 25 °C and 1 bar, high CO 2 uptake of 3.04–3.99 mmol/g was achieved by the carbons. Q st of the NSCDCs was 22.6–28.7 kJ/mol, and CO 2 adsorption selectivity over N 2 was 10.5–17.3 at 25 °C and 1 bar. At 25 °C and 20 bar, CO 2 uptake increased to 11.26–17.29 mmol/g, and exhibited linear dependence on specific surface area. The current work indicated that MES potassium salt/PIPES dipotassium salt could be used as activator for convenient synthesis of NSCDCs as efficient CO 2 adsorbents.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2018
·
IF 5.123
Xingxing Wu,Shucheng Wu,Yingchun Li,Han Chen,Qunhui Yuan,Wei Gan
Lately, an “all-in-one” strategy via direct pyrolysis of protic salt has attracted great attention in the preparation of hetero-doped porous carbons due to its distinctive simplicity. However, protic salt derived carbons usually process large grain sizes thus hamper their applications. Herein, a protic salt derived N, S co-doped porous carbon (N, S-PC) with improved porosity was synthesized by nanocasting and carbonization of protic salt. In the nanocasting silica sphere was used as auxiliary template and an easily obtained protic salt ([pPDA][nHSO 4 ]) was served as C, N and S sources. The obtained N, S-PC contains rich N, S contents and hierarchical textural porosity, thus favors the electrochemical detection of toxic cadmium ions . The N, S-PC based sensor shows excellent sensitivity and selectivity for Cd(II) versus other metals, with a low detection limit of 0.1 μg L −1 (S/N = 3) over a wide concentration range of 4–80 μg L −1 . Applications of the N, S-PC based sensor for Cd(II) assay in tap water samples achieved results with good recoveries, indicating that the N, S-PC based electrode is promising in real sample analysis.
研究领域:
材料科学
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环境科学
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分析化学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Yang Wang,Hui Li,Ji Li,Lina Zhou,Chunkai Feng,Guangwei Liu,Jianzhi Wang,Chen Hou
Perfluorohexane-1,3-dicarboxylic acid (GenX) is now widely used as a substitute for the prohibited perfluorooctanoic acid (PFOA), which has caused growing concerns about its persistence and potential hazards to human health. This study developed a biomass gelatin-derived N and S self-doped porous carbon electrodes (NSGC), for the electro-Fenton (EF) degradation of GenX. To facilitate absorotion, diffusion, and degradation in EF, the NSGC was fluorinated to enhance the selectivit and binding energy between the catalyst and GenX by the “F-F interactions”. The resulted F-NSGC reach 58.8% electroadsorption efficiency to GenX in 60 min, and then degraded 95.8% with a mineralization rate of 63.2% within 180 min. The degradation mechanism was discussed by identifying intermediate products. Moreover, the F-NSGC can maintain a good degradation effect in complex ionic background conditions and actual water samples. These findings extend the applications of biomass-based carbon electrodes and consolidate the effect of F-F interactions on degradation of GenX and other per- and polyfluorinated alkyl substances.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Jianfei Xiao,Yuan Wang,Tian C. Zhang,Shaojun Yuan
Nitrogen-sulfur codoped porous carbon (NSPC) is a promising advanced material, showing great application potential in greenhouse gas capture and energy storage. Here, a novel NSPC with controllable porous structure was fabricated via pyrolysis and activation of N, -containing polycondensates, which were synthesized by one-pot polycondensation reaction of triglycidyl isocyanurate, glucose and thiourea. The obtained sample NSPC-1-650 showed cross-linked spherical morphology with uniform pore size (2.61 nm), large specific surface areas (1927.46 m 2 ·g −1 ), and the doping of nitrogen (4 wt%) and sulfur (2 wt%), which leaded to a good CO 2 adsorption capability (5.56 mmol·g −1 at 298.15 K, 5 bar) and excellent stability. Additionally, when used as a supercapacitor, the NSPC-1-650 sample showed an ultrahigh specific capacitance (224.3F·g −1 at 1 A·g −1 in 6 M KOH electrolyte), an excellent rate capability, and good stability (retained > 85% capacity after 5000 cycles). Notably, the all solid-state symmetrical NSPC-1-650-based supercapacitors delivered a high energy density (the maximal value = 7.8 Wh·Kg −1 ) and power density (the maximal value = 4500 W·Kg −1 ). These results suggest that NSPC-1-650 be a competitive candidate as a CO 2 adsorbent and supercapacitor.
研究领域:
材料科学
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环境科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2021
·Vol. 50
·期 11
·6237-6244
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IF 1.938
Zhao Guixiang,Meng Yanshuang,Zhang Hongshuai,Duan Mingtao,Zhu Fuliang
The development of lithium–sulfur batteries is limited due to its notorious "shuttle effect". Heteroatoms are introduced to the host materials to absorb the polysulfides and further to alleviate the shuttle effect. Herein, porous carbon (NSPC) was successfully prepared by template method and used as sulfur host material. The results show that NSPC has a high specific surface area (697.19 m 2 g −1 ) and abundant heteroatom doping, which helps to enhance the capture and absorption of polysulfides. The prepared S@NSPC was loaded with 76% sulfur, and the composite electrode displayed excellent cycle stability because of its strong polysulfide absorption. The S@NSPC composite electrode shows high initial specific capacity of 741.8 mAh g −1 at 167.5 mA g −1 , the capacity of the S@NSPC composite electrode remained 609.8 mAh g −1 after 500 cycles, and the attenuation per cycle was only 0.027%, showing good stability.
研究领域:
材料科学
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能源存储技术
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2023
·
IF 8.3
Xiaojun Lai,Xuebing Liang,Xiaohua Zhao,Yang Li,Weicheng Xu
To enhance the catalytic activity of carbon materials and streamline their synthesis process, it is necessary to optimize the doping of heteroatoms and reduce the dependence on organic solvents. This can be achieved by utilizing carbonized Polypyrrole-Polythiophene (C(Ppy-Pth)), which is obtained through simultaneous and in-situ co-doping of N and S. This material can serve as an effective activator of peroxydisulfate (PDS) for the degradation of aniline (AN). The results showed that Ppy-Pth could be efficiently synthesized by using cetyltrimethyl ammonium bromide , pyrrole , thiophene , FeCl 3 , and H 2 O 2 in water. Based on the price, self-decomposition and oxidation efficiency, the performance of PDS activated by C(Ppy-Pth) was superior to that of peroxymonosulfate (PMS) in degrading AN. The optimum conditions for catalyzing PDS and degrading 30 mg/L AN by C(Ppy-Pth) were 0.10 g/L C(Ppy-Pth)-1000-1/1, 2.10 mM PDS, and pH 0 = 3.00, which resulted in 86.69% AN removal in 30 min. Carbonation temperature, N/S ratio and pyridine N content are the key factors affecting the catalytic activity of C(Ppy-Pth). Quenching, probe, and electrochemical experiment revealed that in the catalytic PDS system with C(Ppy-Pth)-1000-1/1 (pH 0 = 3.00), the oxidation of AN mainly occurred through the generation of hydroxyl radical (·OH), superoxide anion (O 2 ·- ), and electron transfer on the C(Ppy-Pth)-1000-1/1 surface. The steady-state concentration of ·OH and O 2 ·- were 2.65 × 10 −14 M and 1.97 × 10 −13 M, respectively, and the contribution rate of ·OH oxidation was 31.28%. The oxidation of AN by sulfate radical (SO 4 ·- ) and singlet oxygen ( 1 O 2 ) could be neglected. This study provides a promising strategy for the construction of PDS catalyst and wastewater treatment.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Huiyu Li,Na Li,Pingping Zuo,Shijie Qu,Fangfang Qin,Wenzhong Shen
The development of high-performance bifunctional electrocatalysts for oxygen evolution reaction and heavy metal ion (HMI) detection is significant and challenging. Here, a novel nitrogen, sulfur co-doped porous carbon sphere bifunctional catalyst was designed and fabricated by hydrothermal followed by carbonization using starch as carbon source and thiourea as nitrogen, sulfur source for HMI detection and oxygen evolution reactions. Under the synergistic effect of pore structure , active sites and nitrogen, sulfur functional groups, C-S 0.75 -HT-C 800 demonstrated excellent HMI detection performance and oxygen evolution reaction activity. Under optimized conditions, the detection limits (LODs) of C-S 0.75 -HT-C 800 sensor were 3.90, 3.86 and 4.91 nM for Cd 2+ , Pb 2+ and Hg 2+ when detected individually; and the sensitivities were 13.12, 19.50 and 21.19 μA/μM. The sensor also obtained high recoveries of Cd 2+ , Hg 2+ and Pb 2+ in river water samples. During the oxygen evolution reaction, a Tafel slope of 70.1 mV/dec and a low overpotential of 277 mV were obtained for C-S 0.75 -HT-C 800 electrocatalyst with a current density of 10 mA/cm 2 in basic electrolyte. This research offers a neoteric and simple strategy in the design as well as fabrication of bifunctional carbon-based electrocatalysts.
研究领域:
材料科学
·
环境科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENERGY & FUELS
·
2024
·
IF 5.2
Penghua Zhao,Jiachuan Chen,Lei Zhang,Chenglong Qiu,Baobin Wang,Jinze Li,Kai Zhang,Guihua Yang
Heteroatom-doped porous carbon has become a key material in the field of supercapacitors (SCs) and the oxygen reduction reaction (ORR). Here, eucalyptus pulping red liquor was used as the starting material for a straightforward one-step NH4Cl-assisted carbonization technique that produced a nitrogen and sulfur codoped bifunctional porous carbon material. The sulfur in sodium lignosulfonate was used as a S atom dopant. NH4Cl added to the red liquor can not only produce NaCl as a template but also as a nitrogen source. The resulting carbons possess rich hierarchical porous structures and high specific surface area (1092 m2 g–1) and ID/IG ratio (1.04), leading to remarkable electrocatalytic activity with a specific capacitance of 326 F g–1 at 0.5 A g–1 for capacitance and an identical onset and half-wave potentials of 0.988 V vs reversible hydrogen electrode (RHE) and 0.847 V vs RHE for the ORR, as compared with the benchmark Pt/C catalyst. Furthermore, when BLC-N/S-1000 was used as an electrocatalyst in an air electrode of a zinc–air battery, it showed superior long-term stability for 356 h at 5 mA cm–2 and 20 min/cycle. Results in the present work pave a new green method to convert abundant low-cost biomass into high-end heteroatom-doped carbons with rich hierarchical porous structures for electrochemical energy devices.
研究领域:
材料科学
·
能源化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Xiaojing Zhu,Qikai Wu,Jiale Dai,Dengke Zhao,Chenghao Yang,Ligui Li,Nanwen Li,Shaowei Chen
Directly pyrolyzing organometal complex represents a judicious strategy to fabricate efficient multifunctional carbon-based electrocatalysts , but the structure/composition of the catalysts is commonly complicated and the corresponding electrocatalytic activities are usually compromised. In this study, we report a selective leaching route to prepare small Co 9 S 8 nanoparticles supported on nitrogen, sulfur codoped porous carbon nanosheets (Co 9 S 8 @PNSC) by pyrolyzing sheet-like Co(II)-coordinated thiourea-ethylenediamine-formaldehyde resin (Co-TEFR)/polydopamine (PDA) hybrids that are covered by silica shell layer, followed by removal of the silica and Co nanoparticles with NH 4 HF 2 through a wet etching method. Consequently, the resultant Co 9 S 8 @PNSC exhibits high specific surface area, hierarchical porosity and tiny Co 9 S 8 nanoparticles, which are conducive to the maximal utilization of active sites, endowing remarkable oxygen electrocatalysis with a half-wave potential of +0.845 V for oxygen reduction reaction and a low overpotential of 314 mV at current density of 10 mA cm −2 for oxygen evolution reaction. Besides, such composite also shows a considerable electrocatalytic performance for hydrogen generation. When applied in an assembled zinc-air battery, Co 9 S 8 @PNSC displays a high power-density (203 mW cm −2 ) and favorable cycling lifespan. The results from the present strategy may provide an exemplification in rational design and fabrication of carbon-based nanocomposite for high-performance multifunctional electrocatalysis.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）