Environmental Science-Processes & Impacts
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2023
·Vol. 25
·期 8
·1311-1321
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IF 5.5
Ke Min,Shenxi Deng,Zhao Shu,Yong Li,Bo Chen,Ming Ma,Qian Liu,Guibin Jiang
Elemental carbon (EC) and organic carbon (OC) exist ubiquitously and interact mutually in the environment. Simultaneous analysis of EC and OC will greatly advance our understanding of the behavior and fate of EC and OC, but is however still a great challenge due to the lack of suitable analytical tools. Here, we report a matrix-free laser desorption/ionization mass spectrometry (LDI-MS) method capable of simultaneous analysis of EC and OC by monitoring two independent groups of specific MS fingerprint peaks. We found that EC itself can generate carbon cluster peaks in the low mass range under laser excitation, and meanwhile it can also serve as a matrix to assist the ionization of OC in LDI-MS. By using per- and polyfluoroalkyl substances (PFASs) as a typical set of OC and carbon black (CB) as a model EC, we successfully monitored the adsorption process of PFASs on CB enabled by LDI-MS. We show that hydrophobic interaction dominates the sorption of PFASs to CB, which was affected by the functional groups and carbon chain length of PFASs. Furthermore, environmental substances in water such as humic acid (HA) and surfactants can significantly affect the adsorption of PFASs on CB probably by changing the adsorption sites of CB. Overall, we demonstrate that LDI-MS offers a versatile and high-throughput tool for simultaneous analysis of EC and OC species in real environmental samples, which makes it promising for investigating the environmental behaviors and ecological risks of pollutants.
研究领域:
环境科学
·
分析化学
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Runze Wang,Guoqing Li,Yuyao Ma,Tengpeng Wang,Bin Chen,Tao Wei,Dehua Dong
Hybrid direct carbon fuel cells (HDCFCs) are promising to achieve high power density, good fuel-electrode contact, and high carbon-fuel conversion efficiency due to increased reaction sites and hybrid routines of carbon utilization. However, the performance of HDCFC is greatly restricted by mass transfer and detrimental carbon deposition . The so-called CO–CO 2 shuttle process, i. e., the coupling of the electrochemical reaction of CO to CO 2 and subsequent discharge of CO 2 towards the C fuel surface for gasification, is the key mass transfer process needed to be optimized. This study demonstrates a novel high-performance HDCFCs anode by integrating C-gasification tandem catalysis in dendritic channel anode support ( t -HDCFCs), which greatly enhances the CO–CO 2 shuttle and mitigates carbon deposition. As a result, the t -HDCFC delivers a comparable or even higher electrochemical performance than the other HDCFCs under the same operation conditions, such as a peak power density of 556 mW cm −2 at 750 °C.
研究领域:
能源科学
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材料科学
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电化学工程
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产品关联
DOI
高影响因子
Journal of Environmental Sciences
·
2023
·
IF 6.9
Yue Liu,Junjie Liu,Ji Xiao,Jing Ye,Lixu Guo,Caiqing Yan
Carbonaceous aerosol, including organic carbon (OC) and elemental carbon (EC), has significant influence on human health, air quality and climate change. Accurate measurement of carbonaceous aerosol is essential to reduce the uncertainty of radiative forcing estimation and source apportionment. The accurate separation of OC and EC is controversial due to the charring of OC. Therefore, the development of reference materials (RM) for the validation of OC/EC separation is an important basis for further study. Previous RMs were mainly based on ambient air sampling, which could not provide traceability of OC and EC concentration. To develop traceable RMs with known OC/EC contents, our study applied an improved aerosol generation and mixing technique, providing uniform deposition of particles on quartz filters. To generate OC aerosol with similar pyrolytic property of ambient aerosol, both water soluble organic carbon (WSOC) and water insoluble organic carbon (WIOC) were used, and amorphous carbon was selected for EC surrogate. The RMs were analyzed using different protocols. The homogeneity within the filter was validated, reaching below 2 %. The long-term stability of RMs has been validated with RSD ranged from 1.7–3.2 %. Good correlation was observed between nominal concentration of RMs with measured concentration by two protocols, while the difference of EC concentration was within 20 %. The results indicated that the newly developed RMs were acceptable for the calibration of OC and EC, which could improve the accuracy of carbonaceous aerosol measurement. Moreover, the laboratory-generated EC-RMs could be suitable for the calibration of equivalent BC concentration by Aethalometers.
研究领域:
环境科学
·
大气化学
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分析化学
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Pin Hou,Jiaqi Yan,Xiaoyu Yang,Ridha Djellabi,Xinrui Ge,Xinyu Sun,Jianli Jia,Jianbing Wang
Metal-organic framework (MOF)-derived carbon-based electrodes have demonstrated outstanding capacitive deionization (CDI) performance, owing to their special structures and configurations. Developing novel low-cost controllable protocols to obtain highly efficient Nitrogen-doped carbon-derived MOFs is the most challenging factor to transfer widely the application of these materials at real world. This work aims to develop a low-cost one-step growth route to produce N-doped carbon (NGZC) utilizing N-doped graphene quantum dots (N-GQDs) and zeolitic imidazolate frameworks-8 (ZIF-8) as starting substrates. The surface chemistry, morphology and CDI performance of the as-synthesized NGZC electrode were investigated, compared with conventional materials. The authors found that the introduction of N-doped graphene quantum dots dramatically enhances the mesopore volume (0.742 cm 3 /g) and pyrrolic-N ratio (19.21 %) for NGZC. These improvements effectively shorten the electron and sodium ion transport paths which in turn facilitate the pseudocapacitive activity and charge transfer in NGZC. The specific capacitance and salt adsorption capacity were found to be 283.16 F/g and 17.86 mg/g, respectively, demonstrating superior values than commonly used electrodes. NGZC shows a high stability over 30 adsorption-desorption cycles with a capacity retention of 90 %. DFT results further demonstrate the pseudocapacitive superiority of pyrrolic-N to reinforce the Na + capture. This finding provides new insights into the design of an economical and controllable N-doped carbon electrode for efficient CDI desalination.
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 42
·19688-19697
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IF 3.3
Yang Zou,Xue Li,Siqi Hu,Yumeng Wen,Xiaolong Liu,Chunxin Lu,Tingyu Zhu
Four types of Pt/C catalysts were synthesized by depositing platinum on various carbon materials, including graphene, graphitic carbon nitride, activated carbon, and carbon nanotubes. The microscopic structure and physicochemical properties of these catalysts were analyzed using different techniques such as TEM, XRD, BET, TGA, and XPS. The results indicated that platinum predominantly existed in the form of nanoparticles on graphene, graphitic carbon nitride, and carbon nanotubes. The performance of the catalysts in catalyzing CO oxidation was evaluated, and Pt/CNTs exhibited the highest efficiency compared to other catalysts. At a temperature of 170 °C, the conversion efficiency of CO on Pt/CNTs reached 96.5%. In situ DRIFTS experiments were performed, which did not show any peaks of CO adsorption on the surface of Pt/CNTs. Therefore, the oxidation of CO on Pt/CNTs was presumed to proceed via the Eley–Rideal (ER) mechanism. O2 was adsorbed and activated on Pt NPs to form a Pt NP–O–O*–CO structure with CO, which then decomposed to yield CO2 and an activated oxygen species (O*). Finally, O* reacted with CO again to produce CO2, completing the catalytic cycle.
研究领域:
材料科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Jicheng Li,Hengzhong Fan,Qiangqiang Zhang,Hongxiang Chen,Yunfeng Su,Junjie Song,Litian Hu,Yongsheng Zhang
High-entropy carbides have attracted considerable attention owing to their high melting point and excellent mechanical properties at high temperatures. However, exposures to high temperature environments are often accompanied by oxidation problems. Previous studies generally focused on improving oxidation properties by adding antioxidant elements. However, improving the oxidation properties intrinsically by modifying the crystal structure is still lacking. In this work, we innovative introduced tunable carbon vacancies into high-entropy carbides successfully.Consequently, the oxidation property of high-entropy carbides was improved, with the effect of carbon vacancies on the oxidation property was systematically investigated in this study. The (Ti 0.2 V 0.2 Nb 0.2 Mo 0.2 W 0.2 )C x exhibits the best oxidation resistance property when x = 0.7, with the highest initial oxidation temperature and peak weight gain temperature (950.2 °C) and the lowest mass gain rate (25.2 %). This is mainly attributed to the formation of a higher number of carbonaceous oxides, which hinder the internal oxidation process.
研究领域:
材料科学
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高温材料
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表面工程
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产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Meng Hu,Jiwei Pang,Yuan Tang,Mengdong Ma,Junwen Huang,Penghui Li,Lu Shi,Yan Zhong,Julong He,Jianning Ding
Amorphous carbon exhibits superior performance over its crystalline counterparts due to its unique structural configuration characterized by short-to-medium-range ordered and long-range disordered structure, which fundamentally expands its potential applications in advanced technological fields. The exploration and preparation of novel bulk amorphous carbon materials through innovative synthesis approaches remain crucial in materials research. Here, we successfully synthesized bulk amorphous carbons composed of onion-like carbon structures embedded in disordered graphene networks prepared via spark plasma sintering of carbon black at a pressure of 50 MPa and temperatures ranging from 1700 to 2200 °C. The bulk amorphous carbon demonstrates a unique combination of low density and exceptional mechanical and electrical properties. The sample synthesized at 2200 °C exhibits superior mechanical properties with nanoindentation hardness of 603 MPa, Young’s modulus of 6.78 GPa, compressive strength of 169 MPa, and flexural strength of 69 MPa, comparable to the commercial ISO-68 graphite from Toyo Tanso Co., Ltd. In addition, this bulk amorphous carbon exhibits excellent electrical conductivity, reaching 9.3 × 103 S/m at room temperature. This type of bulk amorphous carbon demonstrates particular promise for advanced applications in aerospace engineering, energy storage, electronic devices, and precision machinery manufacturing.
研究领域:
材料科学
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纳米技术
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工程学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 59
·54020-54026
·
IF 3.289
Jikuan Qiu,Yuling Zhao,Huiyong Wang,Guokai Cui,Jianji Wang
Development of new efficient catalytic systems for chemical transformation of CO2 is a very attractive topic in green chemistry. In this work, we studied the synthesis of α-alkylidene cyclic carbonates through the coupling reaction between propargylic alcohols and CO2 with new silver catalysts. It was found that activated carbon supported AgX (X = Br and I) was a simple and efficient catalyst for the carboxylative cyclization of propargyl alcohols with CO2 at atmospheric pressure and room temperature. Nearly 99% yield of the desired product was obtained, and the product could be simply separated through solvent extraction. Moreover, the catalyst could be easily recovered and reused at least ten times without a decrease in the catalytic activity and selectivity. These findings are useful for the development of an environmentally friendly chemical process for the production of α-alkylidene cyclic carbonates.
研究领域:
绿色化学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2018
·
IF 4.908
Fei Wang,Jianchun Jiang,Kui Wang,Qiaolong Zhai,Hao Sun,Peng Liu,Junfeng Feng,Haihong Xia,Jun Ye,Zhengxiang Li,Fanglin Li,Junming Xu
The activated carbon supported Mo 2 C and W 2 C were synthesized successfully for hydrotreatment of fatty acids to produce diesel-like hydrocarbons. The carburization temperature, carburization gas as well as metal loading amount were studied. High carburization temperature was feasible for W 2 C/AC, but not for Mo 2 C/AC because it resulted in agglomeration of molybdenum compound and destruction of catalyst. Under hydrotreatment condition (360 °C, H 2 3.0 MPa, 3.0 h) the conversion achieved 96.01% over Mo 2 C/AC prepared at 700 °C and 54.88% over W 2 C/AC prepared at 900 °C respectively. During carburization both flowing nitrogen and hydrogen were proper for formation of W 2 C/AC, while only flowing hydrogen was appropriate for Mo 2 C/AC. The hydrotreatment parameters (reaction temperature and reaction time) were also investigated. The high reaction temperature and long reaction time facilitated the conversion of fatty acids, meanwhile the high reaction temperature simultaneously improved the cracking degree of products.
研究领域:
催化化学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Jianfei Xiao,Yuan Wang,Tian C. Zhang,Shaojun Yuan
A novel porous carbon derived from glucose and dicyandiamide incorporated with reduced graphene oxide (rGO) was prepared for CO 2 capture and supercapacitors . In this synthesis, one-pot hydrothermal and KOH activation were employed to obtain reducing graphene oxide/N-doped porous carbon (rGO/NPC) composites. Among the rGO/NPC composites derived, the sorbent rGO/NPC-600-2-1 (1 represents the addition amount of graphene oxide is 1% of the total mass of glucose and dicyandiamide, 2 represents the mass ratio of potassium hydroxide to the precursor of carbon composite material is 2 and 600 means activation temperature is 600 °C) had a large surface area of 865.1 m 2 g −1 , a rich nitrogen doping amount of 7.07 wt%, and a high CO 2 capture ability of 5.77 mmol/g at 298 K. Additionally, the as-synthesized rGO/NPC-600-2-1 was used as a supercapacitor electrode, providing a specific capacitance 210.8 F g −1 in 6 M KOH electrolyte under ambient conditions and excellent charge and discharge long cycle stability (circa 100% capacitance retention at a current density of 10 A g −1 after 10000 cycles). Even at a high current density of 20 A g −1 , a capacity of 141.1 F g -1 is still maintained. The results above suggested that the rGO/NPC composites are applicable candidates for both electrochemical energy storage and CO 2 capture.
研究领域:
材料科学
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环境科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Si Hong,Peng-Fei Wang,Ming-Zhao Xiao,Xiao-Jun Shen,Jia Liu,Xue-Fei Cao,Tong-Qi Yuan
Deep eutectic solvent (DES) pretreatment of lignocellulose is an appealing and green approach for efficient lignin extraction. However, the process of lignin regeneration and DES recovery was time-consuming and labor-intensive. Herein, without any separation and purification after the DES pretreatment of Eucalyptus , the lignin/DES mixture was firstly used to fabricate hierarchical porous carbon materials through DES-thermal carbonization (DTC) and activation. Results revealed that the DTC processing involved degradation, condensation, aromatization, and aggregation, which significantly improved the carbonization degree and thermostability of carbon materials. X-ray photoelectron spectroscopic results confirmed the introduction of nitrogen atom from the choline chloride/lactic acid DES into the fabricated carbon materials during the DTC processing. This phenomenon can generate extra pseudocapacitance and thus increase the specific capacitance of supercapacitors. The capacitance retention of the resultant porous carbon materials (AC-200–12) reached above 95% after 10,000 charge-discharge cycles, which was much superior to commercial activated carbon. This facile and sustainable methodology overcomes traditional complex and expensive methods for preparing carbon materials from hardwood, which show promising potential to be used as electrode materials in a supercapacitor.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Jie Jiang,Wei Song,Meng Zhang,Yu Feng,Hecheng Bai,Hong Zhang,Kai Yu,Guangfeng Kan,Boyan Liu,Yanxiao Jiang
In this work, magnetic nitrogen-doped carbon composites decorated with carbon nanotubes (CNT/Co@N–C) were successfully prepared by carbonizing ZIF-67(Co) and melamine with a ZIF-67(Co)/melamine material synthesized in situ at 525 °C under an inert atmosphere. To improve the malachite green removal performance of the adsorbent, calcination temperatures and mass ratios of the ZIF-67(Co)/melamine-derived CNT/Co@N–C materials were optimized. The malachite green removal performance was evaluated based on various experimental parameters including adsorbent dosage, pH, contact time, and salinity. The results showed that pH and salinity had a small effect on the adsorption process of CNT/Co@N–C materials, thus providing a possibility for practical application in water purification. The adsorption of malachite green onto the CNT/Co@N–C material was consistent with the Langmuir isothermal model and the pseudo-second-order model, and the maximum malachite green adsorption of the material was 3881.30 mg/g. The results also suggested that the adsorption was a monolayer chemisorption process that occurred through electrostatic and π–π stacking interactions. Finally, the recyclability, magnetic properties, high adsorption performance, and high stability of CNT/Co@N–C materials suggest that the materials are a promising adsorbent that can be employed in the removal of malachite green. The present work provides an idea for the synthesis of magnetic carbon nanotubes modified with nitrogen-doped carbon materials derived from metal–organic frameworks (MOFs).
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
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