MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Heng Zhang,Keqin Deng,Xinmei Qian,Chunxiang Li,Jinglun Wang,Qingfeng Yi,Haowen Huang,Hu Zhou
Hexavalent chromium (Cr(VI)) is highly poisonous and can accumulate in the environment. In this work, we developed a photoelectrochemical (PEC) sensor to detect Cr(VI) content. Firstly, a bean-like AgBr 0.8 I 0.2 -Ag-CNTs composite was synthesized through light reduction and hydrothermal method. The physicochemical characterization was investigated and the results revealed that AgBr 0.8 I 0.2 -Ag-CNTs possessed a wide visible light absorption range and excellent photoelectrochemical activity. Subsequently, a “signal-off” PEC sensor based on AgBr 0.8 I 0.2 -Ag-CNTs as cathodic sensing platform and K 3 [Fe(CN) 6 ] as photoelectron acceptor was proposed. After photoelectrochemical reduction of Cr(VI) ions, Cr(VI) was reduced to cover AgBr 0.8 I 0.2 -Ag-CNTs in the form of Cr(OH) 3 , which severely blocked the photoelectron transfer from AgBr 0.8 I 0.2 -Ag-CNTs to K 3 [Fe(CN) 6 ] and resulted in a falling photocurrent. Compared with previous PEC sensors based on the direct reduction of Cr(VI) to Cr 3+ , the proposed sensor showed a wider linear range of 0.1 nM ∼ 5.0 µM and a lower limit of detection (LOD) of 50 pM.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2018
·
IF 6.434
Yan Gao,Ziyan Lv,Ruimin Gao,Gai Zhang,Ying Zheng,Jianshe Zhao
Fuel desulfurization as a crucial subject has aroused people's attention with the environmental problems becoming more and more important. Oxidative desulfurization (ODS) is one of the most promising methods due to its high efficiency, low cost, easy operation and mild reaction condition. With the loading of polyoxometalate (POM), a hybrid material (CNTs@MOF-199) supported catalysts (CNTs@MOF-199-POM) are designed and prepared using one-pot procedure. The novel catalysts are investigated by FT-IR, XRD, XPS, SEM and BET. Factors affecting the desulfurization, such as catalyst dosage, loading amount of POM, reaction temperature, agitation rate and reaction time, are evaluated, and the optimum reaction conditions are determined. The test results indicate that the catalyst CNTs@MOF-199-Mo 16 V 2 possesses superior catalytic activity, with a desulfurization efficiency of up to 98.30%. In addition, CNTs@MOF-199-Mo 16 V 2 exhibits an excellent reusability, and the catalytic efficiency is only slightly reduced after recycling for 7 times. Besides, the kinetic studies indicate that the desulfurization process belongs to apparent first-order kinetic reaction. And the apparent activation energy is 12.89 kJ/mol.
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
ACS Omega
·
2020
·
IF 2.87
Hongjie Zhao,Ran Wang,Huizhen Deng,Lijun Zhang,Lili Gao,Lexin Zhang,Tifeng Jiao
In this work, a new nanocomposite based on octa-amino polyhedral oligomeric silsesquioxanes (POSS), carbon nanotubes (CNTs), and chitosan (CS) was synthesized and used for wastewater treatment. The properties and morphologies of the prepared composite were analyzed by X-ray diffraction, scanning electron microscopy, transmission electron microscope, thermogravimetric, and atomic force microscopy. The results showed that POSS, CNTs, and CS formed a stable composite through intermolecular forces, and the modification of CS by POSS and CNTs improved its stability. In addition, the obtained composite showed good adsorption performance for the degradation of methyl orange and Congo red dyes. The pseudo-first-order model and pseudo-second-order model were used to analyze the adsorption data, and the results showed that the adsorption process conforms to the kinetic model. Moreover, the maximum adsorption capacity of the composite to methyl orange and Congo red reached 63.23 and 314.97 mg/g, respectively. This work provides new ideas for the preparation of self-assembled multi-composite and their potential applications in wastewater treatment.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 54
·期 1
·592-604
·
IF 2.993
Chen Jin,Wang Enqi,Mu Jiechen,Ai Bing,Zhang Tiezhu,Ge Wenqing,Zhang Lipeng
CNTs–C@TiO 2 composite with 3D networks as electrode has been synthesized for lithium ion batteries (LIBs)/sodium ion batteries (SIBs) by a traditional solvothermal process. The composites were characterized by scanning electron microscopy, field emission electron microscopy, X-ray diffraction, Raman spectroscopy, thermogravimetric analysis, and X-ray photoelectron spectroscopy. The continuous 3D conductive networks, which consisted of acid-treated CNTs, provided numerous attachment sites for TiO 2 particles and carbon layers (similar to a shell) produced by the Ti 4+ -induced polymerization of ethylene glycol, thereby promoting electron and ion transfer. The composites contained 10.09 wt% CNTs (excellent conductor) and 12.75 wt% pyrolytic carbon. The Raman spectra confirmed the high degree of graphitization of the composites, and the improved conductivity resulted in outstanding electrochemical behavior. The electrochemical performance in the Li + /Na + storage of CNTs–C@TiO 2 composites was greatly enhanced, as revealed by this material’s outstanding capacity of 205 mA h g −1 at a current density of 0.1 A g −1 after 200 scanning cycles for LIBs and 148 mA h g −1 at 0.1 A g −1 over 100 cycles for SIBs.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Yuhang Zhu,Qiangqiang Wang,Yuhang Han,Lin Li,Maosheng Cao
CNTs, with high electrical conductivity, are considered as an excellent electromagnetic (EM) attenuation material, and have attracted the attention of countless researchers for a long time. However, there is a daunting challenge to obtain both microwave absorbing and electromagnetic interference (EMI) shielding functions in a same material. Herein, by constructing WSe 2 @CNTs heterojunction , excellent microwave absorbing and EMI shielding is obtained, which is attributed to the tunable dielectric properties. The WSe 2 @CNTs composite shows high reflection loss (RL) of −61.6 dB, broad effective absorption bandwidth (EAB) of 4.56 GHz, and efficient EMI shielding . More importantly, high green shielding index (>1) is found in the Ku band. This result confirms the WSe 2 @CNTs composite as a suitable candidate for EM bifunctional materials. Meanwhile, this strategy of constructing heterojunction provides a valuable guide for designing novel EM attenuation materials in the future.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Deqing Zhang,Honghan Wang,Junye Cheng,Changyu Han,Xiuying Yang,Jingyu Xu,Guangcun Shan,Guangping Zheng,Maosheng Cao
Herein, ultra-thin tungsten disulfide nanosheets/carbon nanotubes (WS 2 -NS/CNTs) hybrids were successfully synthesized by using a one-step hydrothermal method. The WS 2 -NS is evenly grown on the surfaces of CNTs , leading to a remarkable three-dimensional (3D) heterostructure. Outstanding electromagnetic wave absorption performance of the WS 2 -NS/CNTs hybrids can be achieved by tuning the amount of CNTs. The minimum reflection loss can reach up to −51.6 dB at 14.8 GHz, and the effective absorption bandwidth is 5.4 GHz for the hybrids with a thickness of 1.95 mm. Comparison of the results with those of simple mixtures of WS 2 -NS and CNTs prepared by using ultrasonic methods indicates that the absorption performance of the optimized WS 2 -NS/CNTs hybrids are closely related to that of the 3D mesh conductive network constructed by the addition of CNTs and the synergistic effect of WS 2 -NS and CNTs in the hybrids. These WS 2 -NS/CNTs hybrids open a new avenue for the development of electromagnetic wave absorbers with extraordinary absorption performance, light weight, small thickness, broad absorption bandwidth, and low cost.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Ying Mao,Langping Wang,Xiaofeng Wang
In order to improve the current-carrying properties of AgCu10 alloy, AgCuS-carbon nanotubes (CNTs) composite coatings were synthesized on AgCu10 substrates using an in-situ sulfide method. During the process, an entangled CNTs layer was formed firstly on the AgCu10 substrate by dipping the substrate into a CNTs dispersant and dried at room temperature, then an AgCuS-CNTs coating was synthesized in-situ by immersing the substrate with the CNTs layer in a 0.1 M Na 2 S solution. The current-carrying friction performance of the composite coating was significantly improved. Compared with the AgCu10 substrate, the friction coefficient was decreased from ∼0.35 to ∼0.15, and the wear rate was reduced by 2 orders of magnitude. Furthermore, the electrical resistivity of the coatings was as low as 2.44 × 10 −6 Ω·cm, which was almost the same as the AgCu10 substrate.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Jieru Guo,Ge Song,Minghua Zhou
Iron-based catalysts usually have a narrow pH application range and are easy to agglomerate and inactivate in the heterogeneous electro-Fenton (Hetero-EF) process. In this work, FeN-carbon nanotubes (FeN-CNTs) catalysts with highly dispersed FeNx sites and tubular structures were synthesized. This FeN-CNTs/Hetero-EF process extended the pH application range to 3–11 with low metal leaching (0.4 mg/L at pH 3) and negligible homogeneous contribution. Compared with nitrogen-doped carbon (N-C, prepared with the same procedure but without FeCl 3 ⋅6H 2 O precursor), its pseudo-first order reaction rate constant was increased by 4.4 times, suggesting that the uniformly dispersed active site FeNx played a key role in the catalytic activation of H 2 O 2 and the efficient degradation of carbamazepine (CBZ). Effective CBZ removal (10 mg/L) could be achieved at low current density (1.25 mA/cm 2 ) and catalyst dosage (50 mg/L) in FeN-CNTs/Hetero-EF. The capture experiments and EPR tests confirmed the existence of various active species such as • OH and 1 O 2 , among which • OH played a dominant role in the degradation of CBZ. FeN-CNTs significantly improves the removal of pollutants under a wide pH range, showing broad application prospects.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Jiaao Dai,Cuijie Zhu,Yong Fan,Li Wen,Yuanfang Zhao,Zhixiang Huang,Wei Zeng,Siliang Wang
In view of the growing market for new energy vehicles and flexible wearable electronic devices, the demand for high performance, low cost and high safety energy storage devices is increasing. Here, a zinc-ion supercapacitor (ZISC) with CZIF-67-CNTs cathode and zinc foil anode was constructed. This energy storage system provides superb electrochemical properties with specific capacitance of 103.3 F g −1 (0.2 A g −1 ), energy density of 32.3 Wh kg −1 (150 W kg −1 ) and capacitance retention of 74 % (20,000 cycles). A facile sensor application is also provided for ZISC with hydrogel as the electrolyte, and the device exhibits a stress-sensitive current response. Then an elastic electrochemical operating mechanism is also proposed. This compressible quasi-solid-state ZISC shows enormous application value in wearable stress sensing and energy storage devices.
研究领域:
材料科学
·
能源技术
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2023
·
IF 5.2
Xijun Li,Luna Ruan,Lihua Zhu,Jun Liu,Huan Zhang
Herein, we synthesized PtCo/CNTs, Pt/CNTs, and Co/CNTs nanocatalysts at room temperature by chemical reduction method. The synergistic effect in PtCo/CNTs for crotonaldehyde (CAL) hydrogenation is investigated. The nanostructures , morphologies, electronic property, Pt–Co interaction, surface characteristic and composition of the catalysts are examined by XRD , BET, SEM, XPS, HRTEM , STEM, STEM-EDX elemental maps and line profiles and H 2 -TPD. It is found that Pt and Co forms PtCo bimetallic nanoparticles in the PtCo/CNTs catalyst and the PtCo bimetallic nanoparticles are coated on multi-walled carbon nanotubes. And PtCo/CNTs achieves 83.5% CAL conversion, 91.3% crotyl alcohol (COL) selectivity, and 647.4 h −1 turnover frequency (TOF) at 60 °C within 2 h under 3 MPa hydrogen, and its catalytic performance remains basically unchanged after five recycles. According to the analysis, the presence of PtCo bimetallic particles lead to electron transferring from Co to Pt (synergy effect), which improves their activation ability of hydrogen and desorption of C C in COL and thus enhances its selectivity to COL.
研究领域:
催化化学
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材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2024
·Vol. 14
·期 20
·1621
·
IF 4.4
Junjun Wang,Linlin Tai,Wei Zhou,Han Chen,Jingxiong Liu,Shaohua Jiang
Transition metal sulfide compounds with high theoretical specific capacity and excellent electronic conductivity that can be used as cathode materials for secondary batteries attract great research interest in the field of electrochemical energy storage. Among these materials, MnSe2garners significant interest from researchers due to its unique three-dimensional cubic structure and inherent stability. However, according to the relevant literature, the performance and cycle life of MnSe2are not yet satisfactory. To address this issue, we synthesize MnSe2/CNTs composites via a straightforward hydrothermal method. MnSO4·H2O, Se, and N2H4·H2O are used as reactants, and CNTs are incorporated during the stirring process. The experimental outcomes indicate that the fabricated electrode demonstrates an initial discharge specific capacity that reaches 621 mAh g−1at a current density of 0.1 A g−1. Moreover, it exhibits excellent rate capability, delivering a discharge specific capacity of 476 mAh g−1at 10 A g−1. The electrode is able to maintain a high discharge specific capacity of 545 mAh g−1after cycling for 1000 times at a current density of 2 A g−1. The exceptional electrochemical performance of the MnSe2/CNTs composites can be ascribed to their three-dimensional cubic architecture and the 3D CNT network. This research aids in the progression of aqueous Cu-ion cathode materials with significant potential, offering a viable route for their advancement.
研究领域:
材料科学
·
电化学能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Yong Liu,Yang Zhao,Jianlong Wang
In this study, a novel Cu 0 -Cu 2 O@CNTs composite was synthesized, characterized and applied to activate peroxydisulfate (PDS) for the degradation of 2, 4-dichlorophenol (2,4-DCP) in contaminated lake water. The results indicated that Cu 0 -Cu 2 O@CNTs can effectively activate PDS to produce O 2 • − radical, which has high selectivity to degrade organic pollutants in actual contaminated water. The efficiency of 2,4-DCP degradation and mineralization was 99.27% and 66.90%, respectively under the optimal condition. In the presence of Cl − , HCO 3 − and natural organic matters (NOMs) or in real wastewater containing 2,4-DCP, Cu 0 -Cu 2 O@CNTs/PDS system had a good selectivity for 2,4-DCP degradation. O 2 • − was the dominant reactive species in Cu 0 -Cu 2 O@CNTs/PDS system for 2,4-DCP degradation. The possible degradation pathway of 2,4-DCP was proposed. It was concluded that Cu 0 -Cu 2 O@CNTs composite could overcome the shortcomings of PDS activation by Cu 0 and Cu 2 O alone, such as low activating capability of Cu 0 and instability of Cu 2 O, which was high efficient for activating PDS. Cu 0 -Cu 2 O@CNTs composite can be used as an efficient catalyst to activate PDS for the degradation of toxic organic pollutants in water and wastewater.
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
危险品化学品经营许可证（带存储）