ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Ranran Ding,Jie Zhang,Jie Qi,Zhenhua Li,Chengyang Wang,Mingming Chen
To address the issues of low electrical conductivity, sluggish lithiation kinetics and dramatic volume variation in Fe3O4 anodes of lithium ion battery, herein, a double carbon-confined three-dimensional (3D) nanocomposite architecture was synthesized by an electrostatically assisted self-assembly strategy. In the constructed architecture, the ultrafine Fe3O4 subunits (∼10 nm) self-organize to form nanospheres (NSs) that are fully coated by amorphous carbon (AC), formatting core–shell structural Fe3O4/AC NSs. By further encapsulation by reduced graphene oxide (rGO) layers, a constructed 3D architecture was built as dual carbon-confined rGO/Fe3O4/AC. Such structure restrains the adverse reaction of the electrolyte, improves the electronic conductivity and buffers the mechanical stress of the entire electrode, thus performing excellent long-term cycling stability (99.4% capacity retention after 465 cycles relevant to the second cycle at 5 A g–1). Kinetic analysis reveals that a dual lithium storage mechanism including a diffusion reaction mechanism and a surface capacitive behavior mechanism coexists in the composites. Consequently, the resulting rGO/Fe3O4/AC nanocomposite delivers a high reversible capacity (835.8 mA h g–1 for 300 cycles at 1 A g–1), as well as remarkable rate capability (436.7 mA h g–1 at 10 A g–1).
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
Journal of Environmental Chemical Engineering
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2018
·
IF 0
Muhammad Usman,Dan Li,Rauf Razzaq,Ullah Latif,Oki Muraza,Zain Hassan Yamani,Bassem A. Al-Maythalony,Chunshan Li,Suojiang Zhang
The numerous environmental challenges attributed to polyaromatic hydrocarbons (PAH) recently accounted to search for better valorization options especially, naphthalene upgrading into tetralin is a promising catalytic process which is important for the petrochemical industry due to the widespread applicability and global demand. A key challenge in this process is to design highly efficient, low temperature active, selective, stable, yet cost-effective catalyst. Herein, we employed impregnation and temperature-programmed reduction (TPR) method and developed an activated carbon (AC) supported molybdenum phosphide (MoP) catalyst. The samples were successfully characterized using XRD , XPX, SEM , TEM , EPMA , TGA/DTA, N 2 adsorption, NH 3 -TPD and pyridine FTIR. The catalysts were evaluated for naphthalene conversion under various operational conditions; 240–360 °C, 4.0 MPa, and 3.0–20/h LHSV. Excellent naphthalene conversion of 82% and 99% selectivity to tetralin was achieved with the 10 wt.% MoP/AC catalyst. This promising low temperature performance could be attributed to the moderate acidity of the catalyst inhibiting hydrocracking; and the large surface area of AC that increased MoP dispersion and associated AC-MoP interactions.
研究领域:
石油化工
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催化化学
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环境科学
✓ 已验证
DOI
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 47
·期 3
·1081-1088
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IF 3.925
Shuchao Jiang,Guoqing Ren,Tie Yu
Formic acid (FA) is regarded as a promising hydrogen storage material, and designing efficient catalysts for the dehydrogenation of high-concentration FA (HCF) is attractive but challenging. Herein, a catalyst comprising PdAu nanoparticles (NPs) anchored on amine-functionalized commercial active carbon (PdAu/AC-NH2) was synthesized and evaluated for the dehydrogenation of HCF without additives under ambient conditions. The Pd3Au2/AC-NH2 catalyst exhibits durable performance and 100% H2 selectivity when the FA concentration is ≤5 M and affords an excellent turnover frequency (TOF) of 3300 h−1 for 5 M FA and 603 h−1 for neat FA at 303 K. Subsequent characterizations reveal that the Au content affects the surface energy and electron property of Pd on PdAu alloy nanocatalysts, which play an indispensable role in the rate committed step of HCOO* adsorption and C–H cleavage. Besides, ultrafine PdAu NPs (2.20 nm) and amine groups synergistically accelerate catalyst activity. This work may pave the way for HCF-based high hydrogen density storage under ambient conditions.
研究领域:
催化化学
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能源材料科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 50
·76321-76338
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IF 5.19
Song Tingting,He Quanbao,Meng Xiaoyan,He Zhangxing,Ge Ming
Heterogeneous photocatalysis/persulfate oxidation process has been considered as a promising technology for dye contaminants removal. The magnetic ZnFe 2 O 4 /active carbon (AC) composites were hydrothermally synthesized and firstly used to activate peroxydisulfate (PDS) for rhodamine B (RhB) degradation under visible LED light irradiation. The optimized Vis-ZnFe 2 O 4 /AC(4/1)-PDS system can enhance the RhB degradation efficiency by 32.01% and 13.87% compared with Vis-ZnFe 2 O 4 -PDS and Vis-AC-PDS systems, respectively. The influence of operational parameters such as catalyst dosage (0.2 − 0.4 g L −1 ), PDS concentration (1.0 − 2.0 g L −1 ), temperature (25 − 45 °C), solution pH (2.7 − 10.9), and coexisting inorganic ions (Cl − , NO 3 − , HCO 3 − , PO 4 3− , Cu 2+ , Fe 3+ , and Ca 2+ ) on RhB degradation was studied, and 100% of RhB (20 mg L −1 ) was degraded after 80 min at operational condition: 0.30 g L −1 of ZnFe 2 O 4 /AC(4/1) and 1.5 g L −1 of PDS, solution pH of 2.74, reaction temperature of 25 °C. The quenching experiments, EPR test, and XPS analysis were employed to reveal the proposed mechanism, which demonstrated that 1 O 2 played a more important role than other reactive species (SO 4 •− , •OH, O 2 •− , and h + ) in RhB degradation. The generation of 1 O 2 via the two routes was as follows: (i) the in situ formed active oxygen (O * ) reacted with HSO 5 − to produce 1 O 2 ; (ii) O 2 •− was oxidized by h + to form 1 O 2 . After five consecutive cycles, the photodegradation efficiency of RhB by ZnFe 2 O 4 /AC(4/1) catalyst slightly decreased from 88.52 to 83.92%, indicating the excellent reusability of ZnFe 2 O 4 /AC(4/1) photocatalyst. As designed, Vis-ZnFe 2 O 4 /AC-PDS oxidation system can effectively remove RhB from the different real water matrices, and the degradation efficiency of RhB in tap water, river water, and secondary effluent was 78.24%, 79.55%, and 74.53% after 80 min of reaction, respectively.
研究领域:
环境科学
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化学工程
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Materials Technologies
·
2022
·Vol. 8
·期 5
·2201682
·
IF 8.856
Yulu Cai,Biao Yang,Junpeng Ji,Fuchang Sun,Yiqian Zhao,Lirong Yu,Changbin Zhao,Manyu Liu,Mingqiang Liu,Yaowu He,Chaohong Zhang,Hong Meng
With the development of modern technology, the functions of smart windows are expected to be more abundant apart from reducing energy consumption. A viable and popular solution is to develop a versatile product. Here a multi-functional tandem device enabled by ionic gels to form a smart glass that can be applied in manifold scenarios, is reported. The ionic gels successfully fulfill the multiple tasks of simultaneously being electrolytes, ion storage medium, as well as transparent electrodes, and help heighten the overall transparency of the devices. The novel tandem configuration simply consists of five stacking functional layers and is universal for DC-driven electrochromic and AC-driven electroluminescent sub-devices. The newly-developed devices demonstrate magnificent characteristics of high and tunable transparency (0–77%), selective infrared shielding ability, diversified displaying and decoration, excellent stability (3000 cycles), and even flexibility. Multifarious application scenarios of the structure in diversified device forms are proposed and presented. The proposed device architecture provides a facile methodology to fabricate functional devices and will provoke infinite novel ideas for developing the next-generation smart windows.
研究领域:
材料科学
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电化学
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光电子学
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能源效率
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2022
·Vol. 331
·期 11
·4635-4648
·
IF 1.754
Liu Chang,Li Ye,Liu Shuang,Zhou Yuzhi,Liu Dongxue,Fu Chengbin,Ye Lingfeng
In this work, an inexpensive PEI-AC sorbent was synthesized by facile hydrothermal grafting method and used to uranium capture from seawater. Batch experimental demonstrated that the optimal operation pH of PEI-AC was 6.0. The adsorption process is conformed to pseudo-second-order kinetic model and Langmuir monolayer adsorption isotherm, and the maximum equilibrium adsorption capacity reached 50.27 mg/g. The PEI-AC samples exhibited better selective and efficiency in various competing ions and uranium-spiked seawater. Furthermore, the removal efficiency remained 88.52% after five sequence adsorption/desorption experiments. By the analysis of XPS, the interaction of UO 2 2+ with N/O-containing ligands were the primary immobilization mechanism.
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
MOLECULES
·
2023
·Vol. 28
·期 13
·5170
·
IF 4.6
Jinyuan Zhu,Yingying Zhu,Yifan Zhou,Chen Wu,Zhen Chen,Geng Chen
The direct or indirect discharge of organic pollutants causes serious environmental problems and endangers human health. The high electron–hole recombination rate greatly limits the catalytic efficiency of traditional TiO2-based catalysts. Therefore, starting from low-cost activated carbon (AC), a photocatalyst (F-Si-TiO2/AC) comprising fluorine (F)- and silicon (Si)-doped TiO2loaded on AC has been developed. F-Si-TiO2/AC has a porous structure. TiO2nanoparticles were uniformly fixed on the surface or pores of AC, producing many catalytic sites. The band gap of F-Si-TiO2/AC is only 2.7 eV. In addition, F-Si-TiO2/AC exhibits an excellent adsorption capacity toward methyl orange (MO) (57%) in the dark after 60 min. Under the optimal preparation conditions, F-Si-TiO2/AC showed a significant photodegradation performance toward MO, reaching 97.7% after irradiation with visible light for 70 min. Even under the action of different anions and cations, its degradation efficiency is the lowest, at 64.0%, which has good prospects for practical application. At the same time, F-Si-TiO2/AC has long-term, stable, practical application potential and can be easily recovered from the solution. Therefore, this work provides new insights for the fabrication of low-cost, porous, activated, carbon-based photocatalysts, which can be used as high-performance photocatalysts for the degradation of organic pollutants.Keywords:F-Si-TiO2;methyl orange;visible light;doped;electronic cage
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIOMASS & BIOENERGY
·
2022
·
IF 5.774
Botian Hao,Wei Ning,Donghai Xu,Yu Wang,Yang Guo,Shuzhong Wang
Indole is commonly reported as a N-containing heterocyclic compounds in biomass supercritical water gasification (SCWG), and is difficult to be degraded to small molecule substances. In this work, Ni/AC, Ni–Cu/AC, Ni–Co/AC, Ni–Ce/AC were prepared and tested for catalytic SCWG of indole. The results showed that Ni–Cu/AC had the highest activity for converting indole and producing gases, leading to the highest hydrogen gasification efficiency (135.1%) and carbon gasification efficiency (33.1%). During the catalytic SCWG of indole, the addition of auxiliary metal Cu in multi-component catalyst showed synergistic effects by changing reaction pathways and reaction rates. It significantly promoted water-gas shift and steam reforming reactions, so forming the highest H 2 yield of 2.62 mol mol −1 . Furthermore, large specific surface, Ni reduction and high catalyst stability point to potential advantages of the Ni–Cu/AC catalyst for catalytic SCWG of recalcitrant N-containing compounds.
研究领域:
化学工程
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能源转换
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环境科学
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催化
·
可再生能源
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
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2022
·
IF 12.92
Qing Yu,Shiyi Wang,Mengru Wang,Xiaoling Mou,Ronghe Lin,Yunjie Ding
Acetylene coupling with ethylene dichloride, which uses both coal and oil resources, is attractive for sustainable PVC manufacturing. Herein, highly active and stable carbon nitride-based catalysts were developed by a novel pre-oxidation-pyrolysis process, affording unprecedented dehydrochlorination activity with good durability. The best-performing system was further modified with different precious metals (Au, Pt, and Ru) to promote the hydrochlorination chemistry between the in-situ formed hydrogen chloride and acetylene co-feed. The presence of metal centers intensifies the hydrochlorination activity but weakens the dehydrochlorination ability due to competitive adsorption between the two reactants at the metal sites. Superior coupling performance was achieved over C 3 N 4 /AC and single-atom Au/C 3 N 4 /AC catalysts in cascade reactors. Our results strongly suggest that dehydrochlorination is an essential step in the coupling reaction, and the activation of acetylene and ethylene dichloride molecules requires different active sites that should be engineered in future work.
研究领域:
化学工程
·
催化科学
✓ 已验证
DOI
高影响因子
ELECTROPHORESIS
·
2019
·Vol. 40
·期 20
·2699-2705
·
IF 2.754
Haochen Qi,Meiqi Zhao,Huaguo Liang,Jayne Wu,Zhengfeng Huang,Anming Hu,Jian Wang,Yingchun Lu,Jian Zhang
Copper is an indispensable trace element for human health. Too much or too little intake of copper ion (Cu 2+ ) can lead to its own adverse health conditions. Therefore, detection of Cu 2+ is always of vital importance. In this work, a simple sensor was developed for rapid detection of trace Cu 2+ in water, in which L-cysteine (Cys) as a molecular probe was self-assembled on a gold interdigital electrode to form a monolayer for specific capture of Cu 2+ . The interfacial capacitance of interdigital electrode was detected to indicate the target adsorption level under an AC signal working as the excitation to induce directed movement and enrichment of Cu 2+ to the electrode surface. This sensor reached a limit of detection of 4.14 fM and a satisfactory selectivity against eight other ions (Zn 2+ , Hg 2+ , Pb 2+ , Cd 2+ , Mg 2+ , Fe 2+ , As 3+ , and As 5+ ). Testing of spiked tap water was also performed, demonstrating the sensor's usability. This sensor as well as the detection method shows a great application potential in fields such as environmental monitoring and medical diagnosis.
研究领域:
环境监测
·
分析化学
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生物传感器
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微流控技术
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电化学传感器
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2017
·
IF 5.951
Liang Qi,Guangyin Ji,Zhigang Luo,Zhigang Xiao,Qingyu Yang
In this work, an enhanced starch-dissolving room-temperature ionic liquid 1-hydroxypropyl-3-methylimidazolium acetate ([C3OHmim]Ac) was tailor-made to serve as the polar phase in the formation of [C3OHmim]Ac/TX-100 + 1-butanol/cyclohexane (IL/O) microemulsion. Its superior solubility to starch was verified by the polarized-light microscope and turbidity test. Furthermore, a pseudoternary phase diagram, conductivity measurement, and dynamic light scattering (DLS) were used to analyze the phase behavior and microregion of IL/O microemulsion. On this basis starch nanoparticles with a mean diameter of 86.69 nm were successfully prepared in this novel IL/O microemulsion with octenyl succinic anhydride (OSA) maize starch as the raw material and epichlorohydrin as a cross-linker through microemulsion cross-linking reaction. For starch nanoparticles, Fourier transform infrared spectroscopy (FTIR) data demonstrated the formation of ester bonds, and cross-linking reaction in starch molecules and X-ray diffraction (XRD) disclosed the destruction of the crystal structure. In addition, scanning electron microscopy (SEM) intuitively revealed that OSA-modified starch nanoparticles possessed good dispersibility, nanoscaled size, and a relatively concentrated size distribution. Finally, drug loading and releasing properties of starch nanoparticles were investigated with indomethacin as a drug model.
研究领域:
纳米技术
·
药剂学
·
高分子科学
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药物递送系统
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绿色化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
IF 6.633
Muhammad Fasehullah,Feipeng Wang,Sidra Jamil
Synthetic ester (SE) oil-based nanofluids (NFs) are indispensable for high voltage (HV) applications due to their impressive properties; for instance, high biodegradability, environmental friendliness, high dielectric strength and thermal stability. In this work, the solvothermal route is adopted to synthesise cadmium sulfide (CdS) nanomaterials of three different morphologies. CdS nanoparticles (NPs) possess a zinc blende (cubic) phase; however, CdS nanobelts (NBs) and CdS ultra-thin nanosheets (NSs) exhibit a wurtzite (hexagonal) phase. Thereafter, CdS nano-additives are dispersed in SE oil (MIDEL-7131) to investigate the influence of phase, morphology and bandgap of nano-additives on the AC breakdown characteristics of nanofluids. The resultant NFs exhibit significantly augmented AC breakdown strength because of expedited charge scavenging ability due to high bandgap and the formation of an electrical double layer (EDL). NPs based nanofluid (SE/NPs), NBs based nanofluid (SE/NBs), and NSs based nanofluid (SE/NSs) display their optimum doping concentration of 0.3 g/L, 0.3 g/L, and 0.2 g/L, respectively. Furthermore, the thermal stability of NFs of optimum doping concentration is investigated and compared with SE via TGA/DSC/DTG technique. The findings evince that the initial decomposition temperature is high and heat dissipation is low in NFs compared to SE, which indicates that the nanofluids are thermally stable both in air and nitrogen. Finally, the kinematic viscosity measurements of NFs of optimum doping concentration exhibit slightly lower viscosity than that of SE. Hence, CdS nano-additive is proved to be a magnificent potential aspirant which is highly efficient for insulating oil-based NFs development without any surfactant.
研究领域:
电气工程
·
材料科学
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纳米技术
·
高压工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）