JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2024
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IF 8
Xiaoman Li,Yuanhua Liu,Haiming Huang,Jianhua Cheng
Photocatalysis-self-Fenton combining photocatalytic production of H 2 O 2 with Fenton reaction has been a hotspot, but the pH limitation and iron sludge production problems remain unsolved. Herein, we proposed a self-fenton system based on N-doped carbon dots modified ZnIn 2 S 4 (NCDs@ZnIn 2 S 4 ) composites that exhibits effective degradation of antibiotics under neutral pH using low amounts of Fe 2+ . The decoration of ZnIn 2 S 4 with NCDs significantly increased the surface area, visible light absorption, charge transfer ability and oxygen adsorption ability. NCDs@ZnIn 2 S 4 composites exhibited a high H 2 O 2 production rate (1528 μM g −1 •h −1 ) under visible light, which was 1.9 and 5.3 times higher than ZnIn 2 S 4 and NCDs, respectively. Meanwhile, the Fe 2+ /NCDs@ZnIn 2 S 4 system with a low concentration of Fe 2+ (1 mg/L) could remove over 95% levofloxacin and oxytetracycline within 30 min. Interestingly, the highest degradation efficiency occurred under neutral pH. Quenching experiments and analytical measurements indicated that the high catalytic performance under pH = 7 with low amounts of Fe 2+ stemmed from the higher amount of inner-generate H 2 O 2 under neutral pH and easy regeneration of Fe 2+ by photoinduced electrons for high •OH yields. Additionally, the Fe 2+ /NCDs@ZnIn 2 S 4 system exhibited high degradation performance under different water matrix and ultrahigh degradation efficiency towards levofloxacin under real sunlight irradiation. The work shows the prospects of photocatalysis-self-Fenton systems for overcoming the pH limitation and the difficulty of iron sludge separation in the purification of effluents.
研究领域:
环境科学
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材料科学
·
光催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Zelin Wu,Zhaokun Xiong,Rui Liu,Chuanshu He,Yang Liu,Zhicheng Pan,Gang Yao,Bo Lai
Metal leaching and catalytic stability are the key issues in Fenton-like reaction. Herein, a hollow yolk-shell nanoreactor (HYSCN) with shell confined Co species was fabricated for peroxymonosulfate (PMS) activation to degrade carbamazepine (CBZ). The uniform Co nanoparticles were completely anchored in a hollow void, further confined by a porous N-doped carbon shell. The unique construction significantly reduces Co species leaching in PMS activation and enhances catalytic stability. Co leaching came from HYSCN dropped by almost fourfold compared to CN-8 without shell confined (0.403 mg/L to 0.120 mg/L). The catalytic stability is also greatly improved, confirming the dominant role of heterogeneous catalysis in the HYSCN/PMS system. HYSCN exhibits excellent catalytic performance compared to a solid structure (SCSCN), demonstrating the significance of hollow structures. Mechanism study found that HO • , SO 4 • – and 1 O 2 induced in HYSCN/PMS system and the relative contributions were distinguished and quantified by stoichiometric methods. The UPLC-Q-TOF-MS/MS was used to identify the CBZ degraded intermediate products and the possible degradation pathway was proposed. This study will provide theoretical guidance for reducing metal leaching and improving catalytic stability in the PMS activation.
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
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Rundong Guo,Dong Su,Fu Chen,Yongzhi Cheng,Xian Wang,Rongzhou Gong,Hui Luo
Microwave-absorbing materials have attracted enormous attention for electromagnetic (EM) pollution. Herein, hollow beaded Fe3C/N-doped carbon fibers (Fe3C/NCFs) were synthesized through convenient electrospinning and subsequent thermal treatment. The special hollow morphology of the samples is conducive to achieve lightweight and broadband microwave absorption properties. The thermal treatment temperatures exhibit a significant impact on conductivity and EM properties. The broadest effective absorption bandwidth (EAB) is 5.28 GHz at 2.16 mm when the thermal treatment temperature is 700 °C, and the EAB can cover 13.13 GHz with a tunable absorber thickness from 1.0 to 3.5 mm when the thermal treatment temperature is 750 °C. The excellent microwave absorption properties of the samples are due to the synergistic effect of impedance matching and strong EM energy attenuation abilities. Hence, the magnetic hollow beaded Fe3C/NCFs are expected to be an attractive candidate material as a lightweight and efficient microwave absorber in the future.
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2022
·
IF 12.92
Jiang Zhang,Zijian Wang,Mugeng Chen,Yifeng Zhu,Yongmei Liu,Heyong He,Yong Cao,Xinhe Bao
Deoxygenative upgrading of 5-hydromethylfurfural (HMF) into valuable chemicals has attracted intensive research interest in recent years, with product selectivity control remaining an important topic. Herein, TiO 2 supported gold catalysts coated with a thin N-doped porous carbon (NPC) layer were developed via a polydopamine-coating-carbonization strategy and utilized for pathway-specific conversion of HMF into 5-methylfurfural (5-MF) with the use of renewable formic acid (FA) as the deoxygenation reagent. The as-fabricated Au/TiO 2 @NPC exhibited excellent catalytic performance with a high yield of 5-MF (>95%). The catalytic behavior of Au@NPC-based catalysts was shown to be correlated with the suitable combination of highly dispersed Au nanoparticles and favorable interfacial interactions in the Au@NPC core-shell hetero-nanoarchitectures, thereby facilitating the preferential esterification of HMF with FA and suppressing unproductive FA dehydrogenation , which promoted the selective formylation/decarboxylation of hydroxy-methyl group in HMF in a pathway-specific manner. The present NPC/metal interfacial engineering strategy may provide a potential guide for the rational design of advanced catalysts for a wide variety of heterogeneous catalysis processes in terms of the conversion of biomass source.
研究领域:
催化化学
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生物质转化
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Na Li,Lihua Liu,Yi Duan,Huiling Gu,Ji Huang,Chengjun Dong,Hongtao Guan,Gang Chen
Magnetic carbon spheres are promising electromagnetic wave (EMW) absorbing materials due to their strong electromagnetic coupling effect. In the present work, magnetic carbon spheres composed of N-doped carbon spheres (NCSs) with magnetic Fe and Fe 3 C (Fe-Fe 3 C) nanoparticles were synthesized and the contents of Fe nanoparticles were adjusted through dilute hydrochloric acid treatment processes. The prepared NCSs/Fe-Fe 3 C composites dominate excellent EMW absorption performances with an optimal reflection loss value reaching − 63.77 dB at 9.92 GHz under a matching thickness of 2.9 mm, and the effective absorption bandwidth (EAB) reaches 4.88 GHz. The excellent absorption performance can be attributed to the synergistic effect of conductance loss, polarization loss, and magnetic loss arising from the different components of the composites. Moreover, the variation of Fe contents can regulate the dielectric and magnetic permeability characteristics of NCSs/Fe-Fe 3 C composites, and finally balance the impedance matching and attenuation coefficient. Our results pave the way for the development of high-efficiency EMW absorbing materials and clarify the regulation mechanism of magnetic media on the absorption performances of magnetic carbon spheres.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Yueyue Ma,Ling Li,Yiman Zhu,Yajing Zhu,Ruqian Lian,Wenming Zhang
Herein, a composite of N -doped carbon coated phosphating cobalt hollow nanofibers (N/C@CoP-HNFs) was synthesized by electrospinning, phosphating, and carbon coating processes. When employed as multifunctional electrode materials for potassium-ion batteries (PIBs) and lithium-sulfur (Li-S) batteries, the N/C@CoP-HNFs demonstrated notable electrochemical properties. Specifically, it delivered an initial specific capacity of 420.4 mA h g −1 at a current density of 100 mA g −1 , with a sustained capacity of 190.8 mA h g −1 after 200 cycles in PIBs, and a specific capacity of 1448 mA h g −1 at a current density of 0.5C in Li-S batteries, which is considered relatively high for these types of battery technology. This good performance may due to the combination of the carbon nitrogen layer and cobalt phosphide bilayer hollow tube structure, which is conducive to telescoping the diffusion length of ions and electrons and buffer volume variation, and effectively inhibits the shuttle effect. Density functional theory (DFT) calculations were also used to explore the energy storage mechanism of the material. The possible adsorption sites and corresponding adsorption energy of K + were analyzed, and the advantages of the material were explored by calculating the diffusion barrier and state density. The theoretical simulations further validated the strong adsorption capability of CoP for polysulfides. This work is expected to provide new ideas for new energy storage materials.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Energy Materials
·
2024
·
IF 5.4
Liang Li,Demin Jiang,Sainan Cai,Shikuo Li,Yuqiao Wang
The sluggish reaction kinetics of the oxygen reduction reaction (ORR) and the formation of a biofilm on the cathode prevent efficient and stable operation of microbial fuel cells (MFCs). In this work, zeolitic imidazolate framework-derived N-doped carbon-supported CoCu-layered double hydroxide nanosheets (CoCu-LDH@NC) were synthesized as a bifunctional cathode catalyst for MFCs. CoCu-LDH supported on CoO@NC induced the production of carbon nanotubes (CNTs) from the NC matrix. CNTs and CoCu-LDH nanosheets improved the atomic reaction efficiency and active area for the ORR. The high-speed electron-transfer channel was attributed to two-dimensional CoCu-LDH nanosheets and one-dimensional CNTs. The catalytic activity and stability of CoO@NC were sustained through the incorporation of CoCu-LDH nanosheets. The electronic interaction of CoCu-LDH and CoO@NC enhanced the ORR catalytic activities. CoCu-LDH nanosheets generated reactive oxygen species (ROS) and Cu+, improving the antibacterial activity to prevent the growth of biofilm for MFCs. CoCu-LDH@NC demonstrated superior oxygen reduction activity with a half-wave potential of 0.84 V and an onset potential of 0.89 V. The maximum power density and operating cycle of the MFCs assembled with CoCu-LDH@NC reached 1012 mW m–2 and 170 h, respectively. This work offers guidance to enhancing the ORR catalytic activity and stability by designing antibacterial ORR catalysts.
研究领域:
材料科学
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环境科学
·
电化学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Xinxiang Chen,Huiqun Liu,Mingzhe Zhou,Guozhao Fang,Haimin Zhang,Zhenyang Cai,Xiaojun Zhao,Lairong Xiao,Sainan Liu,Yi Zhang
ABSTRACT Sodium-ion batteries (SIBs) are one of the most potential candidates for large-scale energy storage due to the low cost and eco-friendliness, however, a stable and reversible anode is urgently developed. In this work, a novel 2 × 2 tunnel-structured K 1.28 Ti 8 O 16 @N-doped carbon nanofibers (KTO@N CNFs) anode is successfully synthesized via simple electrospinning and subsequent thermal treatment with urea acted as the additional convenient nitrogen source. In-situ X-ray diffraction (XRD) measurement confirms the intercalation reaction mechanism and robust structure during Na + insertion/extraction. This composite material exhibits a reversible capacity of 116.4 mAh g − 1 at a current density of 100 mA g − 1 after 1000 cycles. More impressively, even at a high current density of 1 A g − 1 , the battery delivers capacity retention of 98.4 mAh g − 1 after 5000 cycles. The excellent electrochemical performance is attributed to the adequate 2 × 2 tunnel structure and the nano-confinement of N-doped nanofibers on K 1.28 Ti 8 O 16 nanocrystals, which offers enough diffusion paths and enhance the ionic diffusion of sodium ions. This work provides a facile strategy to synthesis stable, reversible, and long-cycle anode for sodium-ion batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Sustainable Energy & Fuels
·
2022
·Vol. 6
·期 11
·2745-2754
·
IF 6.813
Hua Tan,Xuecheng Li,Hao Ma,Xiaolin Yang,Tong Zhan,Wenyu Xie,Suhua Wang,Jiaping Zhu
Herein, N-doped carbon embedded Ni catalysts were prepared by a co-impregnation method followed by pyrolysis in a N2 atmosphere for transfer hydrogenolysis of lignin β-O-4 alcohol and ketone model compounds using isopropanol as the hydrogen source. It was found that pyrolysis at 800 °C resulted in the formation of graphitic N-doped carbon shell encapsulated Ni nanoparticles (Ni@NC-800). The obtained Ni@NC-800 exhibited higher activity and selectivity to aromatics in the conversion of 2-phenoxy-1-phenylthanol and 2-phenoxyacetophenone, compared with Ni@NC-600 and Ni/NC-800. Moreover, the selectivity to aromatics could be further improved over Ni@NC-800-H, which is Ni@NC-800 after strong acid leaching. However, the presence of Cα–OH in lignin β-O-4 model compounds was essential for their product distributions. The control and characterization experiments suggested that the catalytic reaction occurred on the surface of N-doped carbon shells, because the encapsulated Ni NPs could donate electrons to the outer shells, leading to surface electron enrichment, thus making inert shells the new active sites in Ni@NC-800-H. In addition, Ni@NC-800-H was efficient for the conversion of various lignin β-O-4 alcohol and ketone model compounds with methoxyl groups with high yields of the aromatic products and also possessed high stability during consecutive reaction runs, which is because Ni nanoparticles are physically isolated from the reactive environment.
研究领域:
化学工程
·
催化材料
·
可再生资源转化
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Yi Wang,Chuangchuang Liu,Shaofeng Zhou,Rui Hou,Lihua Zhou,Fengyi Guan,Renlian Chen,Yong Yuan
Three-dimensional (3D) nano-structure materials with a large bacterial accessible specific area have emerged as promising electrode materials for bioelectrochemical systems (BESs), achieving high bioelectricity outputs. However, it remains a challenge that biofilms with increased thickness inhibit substrate diffusion into the 3D nano-structure during long-term operation of BESs, causing a reduction in bioenergy output. Herein, an innovative ordered 3D nano-structure electrode was fabricated by growing self-supported N-doped C/Fe 3 O 4 -nanotube composite arrays onto carbon fiber cloth ( [email protected] /Fe 3 O 4 ), using template-based deposition coupled with thermal reduction/carbonization methods. The fabricated [email protected] /Fe 3 O 4 electrode was applied as a bioelectrode in a conventional three-electrode BES and as an anode in microbial fuel cell (MFC), while their capacity to improve bioelectricity generation was assessed. Results indicate that the hierarchical N-doped C-coated nanotube arrays not only significantly enhanced conductivity and areal capacitance of the electrode, but also reduced its charge transfer resistance and provided the 3D open nano-structure with excellent biocompatibility for microbial colonization and internal diffusion of the culture substrate. Consequently, a high maximum current density (4.11 mA/cm 2 ) and coulombic efficiency (~89%) was obtained from the [email protected] /Fe 3 O 4 electrode after about 3 months of BES operation, exhibiting higher biocatalytic performance and extracellular electron transfer efficiency than the original carbon fiber cloth (CC, 1.89 mA/cm 2 ). Moreover, MFC equipped with [email protected] /Fe 3 O 4 anode produced a maximum power density of 1.21 ± 0.04 W/m 2 , which was 2.1 times higher than CC (0.58 ± 0.03 W/m 2 ). This study demonstrates the outstanding advantages of [email protected] /Fe 3 O 4 nanotube composite arrays assembled on CC, making it a potential alternative to existing 3D electrodes for high-performance BES applications.
研究领域:
材料科学
·
环境科学
·
生物技术
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2019
·
IF 7.149
Zhiqiang Sun,Lei Zhao,Caihong Liu,Yufei Zhen,Jun Ma
A novel synergetic mechanism of hydroxyl radical (•OH) oxidation and an intra-electron-transfer nonradical reaction was found in the catalytic ozonation of ketoprofen (KTP) with the in situ N-doped hollow sphere carbon (NHC). Outperforming the conventional •OH-based catalytic ozonation process, O3/NHC not only realized an enhancement of the pseudo-first-order rate constant of 11 times in comparison with that of O3 alone, but was also endowed with a high stability over a wide pH (4–9) and temperature (15–35 °C) range for the degradation of KTP. The high graphitization degree (ID/IG = 0.78–0.88) and low unsaturated oxygen content (0.10–1.38%) of NHC highlighted the dominant role of N-heteroatoms in the O3/NHC system. The specific effects of different N species were confirmed by a relationship study (N property vs catalytic activity) and X-ray photoelectron spectroscopy characterization. The graphitic N forming in the bulk of the graphitic structure served as the “electron-mobility” region to promote KTP degradation with the transfer of electrons from the KTP molecule to O3 via a nonradical reaction process. The pyrrolic and pyridinic N located at defects of the graphitic structure acted as the “radical-generation” region to decompose O3 into •OH for degrading KTP by a radical oxidation process. This finding provided a brand new insight into engineering N-doped carbonaceous catalysts precisely in the catalytic ozonation process for the efficient treatment of organic-contaminated water.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2021
·
IF 5.455
Xiangtao Qin,Taotao Qiang,Lu Chen,Shaoting Wang
MOF-5 is an emerging semiconductor material with a great potential in photocatalytic wastewater treatment . However, its inherent deficiencies, such as the narrow range of photo-response, the fast recombination of photoinduced carriers and the unstable structure, largely limit its further application. In this work, super biocompatible N-doped carbon quantum dots (N-CQD) derived from the green precursor, coconut shells, were in situ grown on MOF-5 via a facile solvothermal method to construction of 0D/3D N-CQD/MOF-5 photocatalyst with an enhanced photoreduction ability. A sustainable and pollution-free preparation process of N-CQD/MOF-5 photocatalyst was delivered and biomass waste resource was effectively utilized via this method. This well-designed photocatalyst with the optimized 1% N-CQD loading presented a considerable photoreduction rate of Cr (VI), which was 2.5 times higher that of pure MOF-5. It also possessed a strong structural stability and reusability even after multiple tests. The boosting photocatalysis activity could be attributed to the doping of N-CQD, who not only act as an electron acceptor to separate the photoexcited electrons and holes effectively, but also play a vital role as a photosensitizer to improve the visible-light absorption. Furthermore, the influence of activation methods on the photocatalytic activity of MOF-5 were also investigated theoretically. For the purpose of clarifying the potentially photocatalytic mechanism of N-CQD/MOF-5 in photoreduction Cr (VI), a series of tests involving photoelectrical characterizations and fluorescence spectroscopy were executed. Therefore, this study provides an innovative photocatalytic system for an enhanced photoreduction performance of Cr (VI) of MOF-5.
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
危险品化学品经营许可证（带存储）