CARBON
·
2022
·
IF 11.307
Jiahao Wang,Junfeng Yan,Jiangni Yun,Pinbo Li,Huiting Zhao,Yu Zhao,Wu Zhao,Zhouhu Deng,Zhiyong Zhang,Zhipeng Zhang,Jiangxiao Tian
A research hotspot material, Prussian blue analogue (PBA), with low cost, easy synthesis, and MOFs structure, has attracted extensive attention in various fields recently. Especially, with the unique unit of metal nanoparticles embedded into the N-doped carbon shell, its derivative is regarded as a candidate in the electromagnetic (EM) absorption field. In this work, CoFe-CNT-PBA, synthesized by the coprecipitation method, was used as precursor to prepare string-bead-like spatial conductive network which is composited by carbon nanotubes (CNT) concatenating units of magnetic CoFe nanoparticles embedded into N-doped carbon shell. To a great extent, the environmental suitability of metal nanoparticles is improved. The result shows, SB-CoFe@C-CNT0.02-800 with microporous and mesoporous has a minimum reflection loss (RL min ) of −67.82 dB at 13.74 GHz with 2.20 mm, and the effective absorption bandwidth (EAB, RL ≤ −10 dB) is 7.23 GHz (10.77–18 GHz) at 2.07 mm. At last, MATLAB was used to simulate by building a double-layer absorber, and EAB dramatically reaches 8.35 GHz, which covers mostly the X band and the whole Ku band . The strategy, CNT concatenating porous micro-spheres derived from PBA, induces conduction loss and interface polarization loss, and provides novel and meaningful thinking for the construction of an excellent electromagnetic wave absorption composite.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
FOOD CHEMISTRY
·
2022
·
IF 9.231
Jingying Yang,Mingfei Pan,Xiao Yang,Kaixin Liu,Yang Song,Shuo Wang
In-situ, real-time and sensitive detection of multiple pesticide residues in food is always an important issue in food safety. Herein, a novel multifunctional bead-string like Ag nanowires@zeolitic imidazolate framework-8 (Ag NW@ZIF-8) core–shell nanochains was successfully synthesized and utilized as surface-enhanced Raman scattering (SERS) substrate for in-situ and simultaneous detection of pesticide residues . Due to the microporous framework structure of ZIF-8 shell and the plasmon property of Ag NWs core, the Ag NWs@ZIF-8 composite was demonstrated to have strong adsorption performance and high SERS activity (enhancement factor: 4.6 × 10 7 ). The Ag NWs@ZIF-8 based SERS strategy achieved sensitive detection of two water-insoluble pesticides methylparathion and carbaryl with detection limits as low as 7.6 × 10 −9 M and 5.7 × 10 −9 M, as well as the in-situ detection of multi-pesticide residues on fruits and vegetables with acceptable recovery ranged from 77.4 % to 117.5 %, demonstrating its great potential for in-situ and rapid detection of food contaminants.
研究领域:
食品安全
·
分析化学
✓ 已验证
DOI
高影响因子
MOLECULES
·
2019
·Vol. 25
·期 1
·47
·
IF 3.06
Chunlei Jiao,Xiao Tan,Aijun Lin,Wenjie Yang
Nanometer zero-valent iron (nZVI) has been widely used in the treatment of heavy metals such as hexavalent chromium (Cr(VI)). A novel composite of bead string-structured nZVI on modified activated carbon (nZVI–MAC) is prepared here, using polyethylene glycol as the stable dispersant rather than traditional ethanol during the loading process. The microstructure characterization shows that nZVI particles are loaded on MAC with a bead string structure in large quantity and stably due to the addition of hydroxyl functional groups on the surface by polyethylene glycol. Experiments on the treatment of Cr(VI) in wastewater show that the reaction process requires only 20 min to achieve equilibrium. The removal rate of Cr(VI) with a low concentration (80–100 mg/L) is over 99% and the maximum saturation removal capacity is up to 66 mg/g. The system converts Cr(VI) to trivalent chromium (Cr(III)) through an oxidation-reduction effect and forms an insoluble material with iron ions by coprecipitation, which is then adsorbed on the surface of the nZVI–MAC. The process conforms to the quasi-second order adsorption kinetics equation (mainly chemical adsorption process).Keywords:bead string structure;nZVI;polyethylene glycol;Cr(VI) wastewater
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2014
·
IF 5.211
Li-Li He,Jie-Ning Zheng,Pei Song,Shu-Xian Zhong,Ai-Jun Wang,Zhaojiang Chen,Jiu-Ju Feng
In this work, a facile one-pot wet-chemical method is developed for preparation of bimetallic platinum–gold (Pt–Au) alloyed string-bead nanochain networks, using allantoin as a structure-directing agent, without any template, surfactant , or seed. The characterization experiments are mainly performed by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD) spectroscopy. The as-prepared Pt–Au nanocrystals show enhanced electrocatalytic performance toward oxygen reduction reaction (ORR) mainly predominated by a four-electron pathway, and display improved catalytic activity and high stability for methanol oxidation reaction (MOR) over commercial Pt black and Pt–Ru black.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）