CHEMICAL PHYSICS LETTERS
·
2019
·
IF 1.901
Fan Li,Wanjun Xu,Linyi Lu,Kai Zhou,Zhining Xia
The high-quality sulfur-doped graphite (SGi) was prepared from concentrated sulfuric acid-graphite intercalation compounds (H 2 SO 4 -GICs) by solid-state microwave irradiation, where H 2 SO 4 was the sulfur (S) source and S-doping occurred within a minute. The preparation of H 2 SO 4 -GICs was a key step for S-doping and exfoliation process. Notably, it was found that S-doping was influenced by the dosage of H 2 SO 4 , where the lower dosage of H 2 SO 4 was beneficial for the S-doping. The exfoliation efficiency was greatly affected by the temperature and dosage of oxidant, where lower temperature and lower dosage of KMnO 4 guaranteed efficient exfoliation.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE FORUM
·
2016
·
IF 0
Shu Yu Zhong,Hai Shao Ye,Ji Qi Jiang,Qian Yang,Pei Song Tang
Using La (NO3)3·6H2O, NH4VO3, citric acid as the main raw materials, nanocrystalline LaVO4 sample was prepared by microwave method. The structure and morphology of sample were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-visible diffuse reflectance spectroscopy (DRS) and Fourier Transform Infrared (FT-IR) spectroscopy. The photocatalytic activity of LaVO4 was studied for methyl orange (MO) used as simulated sewage. The XRD and SEM showed that the particle size of LaVO4 was about 80-100 nm. The DRS showed that LaVO4 had optical absorption onset of 356 nm, indicating the optical band gap of 3.48 eV. The FT-IR showed that LaVO4 had vibration peaks of Fe-O and V-O bond. Under UV-light, the photocatalytic experiment indicated that the prepared LaVO4 nanocrystalline had highly photocatalytic activity for degradation of methyl orange.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2023
·
IF 6.1
Lijun Du,Ning Lv,Jiashuai Li,Jiayi Zhang,Yilan Chen,Yalin Zhang,Zhen Li,Xianqiang Huang,Jujie Luo
NiCoSe 4 nanoflowers were synthesized on carbon fiber felt (CFF) by microwave method, and the effects of microwave time and microwave power on the morphology, physical phase and performance of NiCoSe 4 @CFF were explored. The results display that the nanostructured NiCoSe 4 prepared under the microwave irradiation of 1000 W for 120 s is uniformly loaded on the CFF. The NiCoSe 4 @CFF electrode exhibits a superior specific capacity of 1653.6F g −1 at 1A/g and maintains a superior cycling performance of 87.05 % of the initial capacitance over 150,000 cycles. In addition, the flexible supercapacitor fabricated with NiCoSe 4 @CFF as the cathode exhibits excellent flexibility and flexural strength. As an effective catalyst for oxygen evolution reaction (OER), NiCoSe 4 @CFF demonstrates a low overpotential of 0.358 V, a relatively small Tafel slope of 115.93 mV dec −1 and an excellent lifetime at 10 mA cm −2 .
研究领域:
材料科学
·
电化学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2020
·Vol. 44
·期 6
·4556-4567
·
IF 3.741
Xiaoqi Tan,Shuxia Liu,Qingping Guo,Jie Zhang,Shujun Liang,Maoyong He,Jujie Luo
Summary Amorphous MnO 2 was attached to carbon nanotubes (CNTs) in 60 seconds by solid-state microwave method. As electrodes in supercapacitors, the coactions of the MnO 2 and CNT augmented the actual value of capacitance to 1250 F g −1 , and cycle steadiness held 80% of the starting value after 7000 cycles. The equipped MnO 2 /CNT//AC asymmetric supercapacitor (ASC) manifested preferable energy density with 33.5 Wh kg −1 (at 400 W kg −1 ). Its glorious electrochemical properties of MnO 2 /CNT demonstrated that the microwave method has great potency to realise the composite of electrode materials.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2021
·
IF 7.033
Rongyu Deng,Fulu Chu,Huanyu Yu,Felix Kwofie,Mingzhi Qian,You Zhou,Feixiang Wu
Expanded graphite has garnered considerable interest for potential applications in electrochemical energy storage due to its distinctive morphological and structural Li storage features. However, the present synthetic procedure of preparing expanded graphite is highly complex and yields low production. Herein, we demonstrate that an efficient microwave method can produce large-scale expanded graphite utilizing anthracite as a precursor. The designed expanded graphite exhibits a remarkably ordered graphitic structure and a unique morphology of porous layered gossamer nanosheets having a wider pore size distribution within the ranges of 3–70 nm and a practically huge specific surface area being 21.5 m 2 g −1 , which are beneficial for improving the conductivity of expanded graphite, inducing more active sites for electrochemical reactions and accelerating Li + diffusion. Furthermore, the expanded graphite demonstrates a promising capacity utilization of 278.0 mAh g −1 and a stable Coulombic efficiency of 99.17% during 300 cycles at 0.2C when it is employed as lithium-ion batteries anode material. Hence, this study presents a promising method for the large-scale production of expanded graphite materials as anodes for lithium-ion battery by exploiting natural anthracite as the low-cost raw material.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2016
·Vol. 122
·期 7
·1-10
·
IF 1.444
Du Chun,Zhou Jiangshan,Li Fangzhou,Li Wei,Wang Yinzhen,He Qinyu
A facile and low-cost microwave method was used to prepare C and N co-doped TiO 2 in just 8 min. The prepared samples were thoroughly characterized and were found to have favourable features such as surface adsorption of pollutants and photocatalysis. The rapid decomposition of CH 5 N 3 HCl under microwave irradiation led to mesopores and surface roughness in the as-prepared particles, resulting in large surface adsorption of pollutant and good photodegradation. The best sample is the one with the ratio of TiO 2 /CH 2 N 3 HCl at 3:1, which adsorbed 86.3 % of a methylene orange (MO) solution (20 mg L −1 ) in 10 min.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 54
·34041-34048
·
IF 3.108
Yaguo Cai,Xianqing Piao,Wei Gao,Zhejuan Zhang,Er Nie,Zhuo Sun
In this study, we report a large-scale and facile synthetic method for silver nanoparticles via a microwave method, which is quite time-saving and efficient. The obtained silver nanoparticles maintained a uniform size, and the average size was less than 20 nm although the concentration of the silver source was very high. The obtained silver nanoparticles could be homogeneously dispersed in deionized water, which was beneficial for the fabrication of the conductive ink. For large-scale industrialization, the synthetic process window was widened to a great extent via a series of experiments. We injected the ink into a blank mark pen to fabricate a conductive pen, via which the tracks drawn on the photo paper could immediately become conductive at room temperature with an electrical conductivity of 2.4 μΩ cm (about 1.5 times that of the bulk Ag). The mechanical properties of the tracks were examined for a twistable application. After bending at a radius of 4 mm and 2 mm for 5000 circles, only a slight increase in their resistance of 1.20 and 1.78 relative to their initial resistance, respectively, was observed. The as-prepared conductive ink and fabricated pen have potential applications in flexible electronics.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 87
·84457-84463
·
IF 3.289
Jiangshan Zhou,Fangzhou Li,Chun Du,Junming Liu,Yinzhen Wang,Wei Li,Guannan He,Qinyu He
In recent years, microwave sintering has become a common tool in materials science because of its rapid heating rate and high energy utilization efficiency. In this study, a fast one-step microwave method (3 min) was employed to prepare a porous nitrogen and carbon co-doped TiO2/activated carbon ((C,N)-TiO2/AC) composite bulk material. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), photoluminescence (PL) spectroscopy, ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS), and electrical conductivity measurements. Photodegradation and recyclability experiments were also performed. For comparison, a sample was made by physically mixing (C,N)-TiO2 and AC, and was characterized and examined by the same technique. The photodegradation of a methyl orange solution by the porous (C,N)-TiO2/AC bulk revealed its good photocatalytic properties, with 94% photodegradation occurring within 100 min of irradiation following the initial 4 h of adsorption in the dark. The porous (C,N)-TiO2/AC bulk also demonstrated very good recyclability, achieving 94% photodegradation in the 6th recycle. The results show that the composite material can be used in commercial photodegradation processes because of its low cost, simple method of preparation, and good recyclability.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2024
·
IF 4.3
Junmei Liu,Yu Zhang,Xirui Miao,Haichao Li,Chunying Tao,Jin Liu,Xudong Yang
Novel nitrogen-doped carbon dots (N-CDs) were prepared by microwave method using o -phenylenediamine and formamide as raw materials, and the N-CDs were used successfully for sensing Co(II) on the basis of photoluminescence quenching. The structural characterization of the obtained N-CDs was thoroughly performed by transmission electron microscopy (TEM), Fourier transform infrared (FT-IR) and X-ray diffraction (XRD) spectroscopy. The optical properties were also determined by absorption and fluorescence spectra. N-CDs have bright yellow fluorescence emission and high quantum yield (29 %), with a detection limit as low as 0.38 μM. In order to detect Co(II) more conveniently and quickly, N-CDs/PVA fluorescence composite film was prepared by compounding N-CDs with polyvinyl alcohol. The fluorescence composite film combines the fluorescence characteristics of N-CDs and the stability of polyvinyl alcohol. The application range of Co(II) visual detector in the water environment is expanded.
研究领域:
材料科学
·
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·
IF 2.7
Yuanwen Hou,Jia Tang,Li Jiang,Ning Xie,Hongquan Fu,Juan Zhang,Hejun Gao,Bin Xu,Yunwen Liao
Piezocatalytic technology represents an innovative form of advanced oxidation technology for degradation of organic pollutants. Piezoelectric catalysis technology combines electrochemistry and piezoelectric properties, and promotes charge transfer through a piezoelectric field, thus promoting catalytic reactions. This study employed a one-step microwave method to fabricate an α-Bi2O3/BiO2 heterojunction with a narrow bandgap. This catalyst exhibited a high efficiency in the degradation of methyl orange dye, achieving a removal rate of 93% in 60 minutes, with a reaction rate constant of 0.0324 min−1. The investigation of the catalytic mechanism demonstrates that the construction of the α-Bi2O3/BiO2 heterojunction facilitates the separation of charge carriers, increases the degree of polarization, and consequently enhances the efficiency of piezoelectric catalytic degradation. This work opens the way for the design and development of high-performance piezoelectric catalysts.
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
Journal of Cleaner Production
·
2019
·
IF 6.395
Song Cheng,Fuqiang Liu,Chen Shen,Changqing Zhu,Aimin Li
A green and energy-saving method was proposed to fabricate magnetic carbon (Fe@CS) beads (diameter: 0.5–1 mm) as Fenton-like catalyst and to simultaneously regenerate saturated activated carbon. Chitosan (CS) was used as the precursor of carbon, and tremendous heat produced during the regeneration of activated carbon by microwave irradiation (600 W) was utilized for carbonization within 2 min. The effects of microwave irradiation time and iron/CS mass ratio on Fe@CS were evaluated through various characterization methods, such as iron content, phase, microstructure, degree of graphitization , and associated Fenton-like catalytic activity . Fe 3 O 4 and slight Fe(0) were the main iron species in Fe@CS beads. The microstructure of Fe@CS beads presented a hollow nanosphere structure and the Fe 3 O 4 nanoparticles were uniformly embedded in the carbon layer . The Fe@CS/H 2 O 2 Fenton-like system managed to efficiently degrade acid orange II even in a wide pH range of 3–9. Hydroxyl radical was proven by electron spin resonance spectroscopy as the dominant active species. The crystal or catalytic activity of Fe@CS hardly changed after five cycles. Moreover, the catalytic activity was enhanced after each cycle because the surface bound iron and increased iron leaching (<2 mg/L in first four cycles). The stability could be restored (decreased iron leaching) easily through a convenient regeneration process. In conclusion, this study proposed a novel and facile method for preparing reusable heterogeneous Fenton-like particle catalysts , providing valuable insights for the green, energy-saving and reusable applications of catalysts.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Environmental Sciences
·
2017
·
IF 2.865
Fangzhou Li,Jiangshan Zhou,Chun Du,Wei Li,Yinzhen Wang,Guannan He,Qinyu He
A one-step microwave irradiation method was used to deposit carbon and nitrogen co-doped TiO 2 ((C, N)-TiO 2 ) on commercial brick ((C, N)-TiO 2 /brick). The as-prepared samples were characterized by X-ray diffraction, ultraviolet–visible (UV–vis) diffuse reflectance spectroscopy, photoluminescence spectroscopy, X-ray photoelectron spectroscopy, and scanning electron microscopy (SEM). A selective technique was also used to investigate the concentration of hydroxyl radicals during UV–vis irradiation of the Methyl Orange solution with the as-prepared samples. The C and N dopants enhanced visible light absorption and provided a longer lifetime for the photo-generated electron–hole pairs. The SEM images showed that the as-prepared sample is porous. The dark adsorption and photodegradation test for (C, N)-TiO 2 /brick showed good photodegradation and good recyclability . The best photodegradation rate was 94% after 2 hr. The maximum degradation rate was maintained even after the 6th cycle. The good photocatalytic properties are attributed to the enhanced visible light absorption , enhanced pollutant adsorption arising from the porous structure of the (C, N)-TiO 2 thin film , and longer lifetime of the photo-generated electron–hole pairs. (C, N)-TiO 2 /brick should have potential commercial applications in photodegradation processes because of its low cost, good photodegradation, and excellent recyclability .
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
危险品化学品经营许可证（带存储）