CARBON
·
2023
·
IF 10.9
Jie Li,Jie Sheng,Ziyue Yang,Zhaoyuan Liu,Yunzhong Wu,Changsheng Xing,Jiaxu Shuang,Bin Liu,Tong Zhang,Zhaoyu Chen,Lidong Wang,Weidong Fei
Graphene is the strongest material ever identified. However, the fabrication of graphene-based bulk materials from graphene powders presents a significant challenge. Here, a new strategy to fabricate high performance graphene based bulk materials by introducing silicon nanoparticle is proposed. Consequently, ultra-high compressive strength and high flexural strength are achieved, measuring as high as 1102 MPa and 455 MPa, respectively. The compressive strength at the microscale even reaches a remarkable 5.17 GPa. The superior strength of the bulk material is primarily attributed to the Y-type carbon structure and Si-C bonds. The Y-type carbon structures in graphene, produced by the self-propagating high-temperature synthesis (SHS) method, and the Si-C covalent bonds formed at the interface between graphene and SiC contribute to a tight linkage of graphene sheets , thereby preventing slippage of graphene sheets. In addition, the microstructure evolution process of Si-SHS-graphene bulk material is clarified. With the introduction of silicon nanoparticles, the oxidation resistance of graphene based bulk materials is substantially improved, the weight loss is around 6% after oxidized at 1000 °C. This study carries extensive implications for understanding the impact of Y-type carbon structures and the effect of Si-C bonds in graphene-based bulk materials.
研究领域:
材料科学
·
力学工程
✓ 已验证
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2013
·
IF 5.695
Ting Wen,Nian Bing Li,Hong Qun Luo
A novel sensing system has been designed for the detection of sodium dodecyl sulfate (SDS) based on the recovered fluorescence signal of eosin Y and polyethyleneimine (PEI) complex. The eosin Y reacted with PEI to form a complex by virtue of hydrophobic interaction as well as the electrostatic interaction, which resulted in a strong fluorescence quenching of the eosin Y. Subsequently, with the addition of SDS to the eosin Y/PEI system, a strong surface interaction and electrostatic interactions between PEI and SDS resulted in the formation of the PEI/SDS complex and the dissociation of the eosin Y/PEI complex, which led to the significant fluorescence recovery. Herein, we have demonstrated that this facile methodology can offer a rapid, reliable, and selective detection of SDS with a detection limit as low as 0.02 μg mL–1 and a linear range from 0.4 to 6 μg mL–1. Furthermore, the method has been successfully applied to the detection of SDS in real samples with satisfied recovery and accuracy. Overall, these results demonstrate that this method has great promise for environmental applications.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2023
·
IF 2.8
Jiayu Feng,Kai Li,Ping Ning,Chi Wang,Xin Sun,Fei Wang,Peng Gao
In this study, a series of Mg-modified γ-Al2O3 sorbents have been introduced to simultaneously remove HCl and HF in a low-temperature environment. These sorbents were prepared by impregnation, and the effects of Mg loading amount and calcination temperature on the performance of the sorbent were investigated. The optimal sorbent (modified by 15 wt% Mg and calcined at 400℃, Mg15/Al2O3-400) exhibited the highest adsorption capacity of all the sorbents tested, 37.89 mg(HF)•gsorbent−1 and 34.54 mg(HCl)•gsorbent−1, respectively. Taking into account an excellent HF(HCl) capacity of the Mg15/Al2O3-400, these sorbents are very promising HF(HCl)sorbents usable in a low-temperature environment. The role of MgO loaded on γ-Al2O3 was investigated by Brunauer−Emmet−Teller (BET) method, X-ray diffractometer (XRD), scanning electron microscopy (SEM-EDS), X-ray photoelectron spectroscopy (XPS), temperature-programmed desorption of CO2 (CO2-TPD), and thermogravimetric analysis (TG-DTG). The results revealed that MgO acted as a ‘leading role’ to promote the adsorption activity of the sorbents. BET analysis demonstrated that the Mg modification process did not seriously change the pore type of the γ-Al2O3. CO2-TPD results revealed that the calcination temperature will significantly affect the number and strength of the basic sites on the surface of the sorbent. In addition, XRD and XPS analysis indicated that the consumption of MgO and the accumulation of reaction products on the surface and pores are the main reasons for the deactivation of the sorbent.
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
ACS Catalysis
·
2020
·
IF 12.35
Peng Liu,Zhi Li,Xingyu Liu,Weiyu Song,Bowen Peng,Xinyue Zhang,Suofu Nie,Penghui Zeng,Zhongdong Zhang,Xionghou Gao,Baojian Shen
In fluid catalytic cracking (FCC), Brønsted acid plays a very important role. Herein, a zinc-modified ultrastable Y (USY) zeolite containing higher Brønsted acidity was prepared by synergistic treatment with zinc chloride and steaming. The results of characterization showed that selective dealumination and silicon healing due to introduction of zinc ions ([ZnCl]+ and [ZnOH]+) into zeolite could promote the formation of extra-framework silicon (EFS) and different silicon healing of the Al vacancies, which led to the formation of half-sodalite cages connecting with supercages and thus increased the availability of acidic sites in the sodalite cage. Meanwhile, DFT calculations demonstrated that the acidic strength of protons in the sodalite cage was enhanced by [ZnCl]+ and [ZnOH]+, and the synergy of Brønsted/[ZnCl]+ became stronger. As a result, the strong Brønsted acid was increased by 19%. This translated to higher n-octane and heavy oil (VGO) catalytic cracking activity and gasoline yield.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2016
·Vol. 33
·期 6
·1931-1937
·
IF 1.408
Fu Xiaoqin,Sheng Xiaoli,Zhou Yuming,Fu Zhiwei,Zhao Shuo,Zhang Zewu,Zhang Yiwei
Well-dispersed hierarchical zeolite Y, structure-directed by ionic liquid 1-methyl-3-[3'-(trimethoxysilyl) propyl] imidazolium chloride, was synthesized for the first time using a novel ultrasonic/microwave synergistic synthesis (UMSS). The time required for the synthesis of zeolite Y by UMSS method was remarkably reduced to 6 h instead of 24 h under conventional hydrothermal conditions. The structures of all samples were characterized by XRD, BET, FT-IR, SEM and TEM. The results clearly demonstrated that the UMSS is a promising strategy to achieve zeolite Y with improved crystallinity, large BET surface area, bulky mesopore volume, well-dispersed morphology, small zeolite nanoparticle. The catalytic activity of hierarchically micro-mesoporous zeolite Y was evaluated by using the alkylation of o-xylene with styrene. Mesoporous zeolite Y synthesized by UMSS method showed significantly higher catalytic activity, stability and reusability, compared with conventional hydrothermal synthesis. It might be ascribed to its large mesoporous volume, small crystal nanoparticle and high surface area, minimizing the diffusion length as the reactant molecules diffuse into the pores, and correspondingly the products diffuse out of zeolites. This study suggests that UMSS method is a good alternative for the synthesis of micro-mesoporous zeolite Y, which may be of remarkable benefit for industrial applications.
研究领域:
材料化学
·
催化化学
·
纳米材料科学
·
工业化学
·
多孔材料
✓ 已验证
DOI
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2022
·
IF 6.056
Chengtuo Niu,Lina Yang,Feiyun Zheng,Chunfeng Liu,Jinjing Wang,Xin Xu,Qi Li
This study aimed to provide a systematic analysis of the effect of environmental factors on the growth and volatile flavor compounds (VFCs) production ability of Zygosaccharomyces rouxii Y-8 and further elucidate its contribution to doubanjiang fermentation in different salinity. Lower salinity (0–9%), acidic pH (4.5–5.5), moderate temperature (25–35 °C) and air exposure favored the growth and VFCs accumulation of Z. rouxii Y-8, which also had higher concentrations of key jiang flavor contributing compounds benzene ethanol, 2-methoxy-phenol and pyrazines. Interestingly, samples with higher VFCs concentration were found to contain less kinds of VFCs. When inoculated into doubanjiang fermentation, Z. rouxii Y-8 showed critical roles on the formation of VFCs in doubanjiang . Among doubanjiang samples fermented in different salinity, doubanjiang with 9% salinity had the highest kinds of VFCs. Moreover, its flavor was more balanced and the jiang flavor was stronger. This indicated that the presence of adequate salinity was necessary for Z. rouxii Y-8 to produce critical VCFs responsible for doubanjiang flavor. The results would provide researchers and manufacturers with a deeper understanding of the characteristics of Z. rouxii Y-8 and rationales to utilize Z. rouxii Y-8 as starter to produce high quality BBFFs.
研究领域:
微生物学
·
食品科学
✓ 已验证
产品关联
DOI
高影响因子
RENEWABLE ENERGY
·
2020
·
IF 6.274
Hui Yong,Xin Wei,Jifan Hu,Zeming Yuan,Ming Wu,Dongliang Zhao,Yanghuan Zhang
A composite catalyst Fe@C was successfully prepared by chemical blowing and carbonization method, at the same time its defect level, pore distribution and specific surface area were investigated. In addition, the Mg–Ce–Y + x wt.% Fe@C ( x = 1, 3, 6, 10) composites also were synthesized by mechanical ball-milling. The effect of the Fe@C content on hydrogen absorption and desorption property of the Mg–Ce–Y alloy was characterized by XRD, SEM , TEM, PCI , and DSC method. The activated composites exhibit an excellent absorption and desorption kinetic performance, which attributeed to the efficient catalysis of Fe@C composite catalyst. The Mg–Ce–Y + 6 wt % Fe@C composite exhibits the fastest hydrogen absorption/desorption kinetics and relatively lower decomposition temperature and it can absorb 90% of the maximum hydrogen capacity within 2 min and only takes 12 min to release the same amount of hydrogen under 300 °C. Besides, the dehydrogenation activation energy is reduced to 84.9 kJ/mol and the initial hydrogen release temperature is less than 250 °C, which is owing to the outstanding synergistic catalyst effect of Fe@C on Mg-based hydrogen storage alloy . However, the thermodynamic properties of the composites have not been improved, of which the enthalpy change is 80.6 kJ/mol.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Zihan Liu,Chaojie Li,Zhiru Yuan,Weiwei He,Lifen Zhang,Zhenping Cheng
A fluorinated surfactant exhibits extremely high surface activity and is the key component of the aqueous film-forming foam (AFFF) extinguishing agent. Unfortunately, the long fluorinated carbon chain has been proven to be bioaccumulative and has been banned internationally. This study aims to design and synthesize Y-shaped surfactants based on short fluorocarbon chains through atom transfer radical addition (ATRA), while maintaining the excellent performance as that with a long fluorocarbon chain. A minimum surface tension of 13.5 mN/m for (FC6HC6)2-CHOSO3Na can be reached with even a quite low concentration (0.04 g/L) according to a surface activity test, satisfying the performance requirements of the surfactant used for AFFF extinguishing agent. Moreover, the aqueous solution on the oil spreads out rapidly (<0.5 s), with a large spreading area of 2.89 cm2. In addition, an AFFF extinguishing agent formula based on the synthesized fluorinated surfactant is successfully obtained, whose foam production fulfills the requirements of the national standard of a fire-extinguishing agent (GB 15308-2006). In subsequent fire extinguishing tests, this extinguishing agent behaves successfully. To sum up, the Y-type surfactant is a degradable surfactant, which can be used as an AFFF extinguishing agent with excellent performance, highly promising in practical application.
研究领域:
化学工程
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2019
·
IF 5.026
Ying Li,Yijie Han,Wei Li,Yuxin Li,Deyun Zhang,Yeqing Lan
A novel magnetic sulfur-doped Fe–Cu–Y trimetal oxide (MST) nanomaterial was successfully synthesized by a chemical coprecipitation method to remove As(III) via simultaneous oxidation and adsorption and then characterized by BET, VSM, FESEM, XPS, and FTIR techniques. The effect of solution initial pH on the adsorption of As(III), and the adsorption kinetics and isotherm were investigated in detail. The results indicated that the MST nanoparticles exhibited an excellent performance for As(III) removal in a pH range of 7–10 and were easily separated from aqueous solution with a magnet. The maximum removal capability for As(III) reached 202.0 mg/g at pH 7.0. The adsorption of As(III) was well fitted by the pseudo-second-order kinetic model and Langmuir isotherm model, respectively. The investigation of mechanism revealed that As(III) could be oxidized to As(V) by O 2 − and OH free radicals, generated via the dissolved O 2 obtaining an electron from Cu(I) on the surface of the adsorbent and Fenton/Fenton-like reaction, respectively. Meanwhile, the produced As(V) was adsorbed onto the surface of the nanoparticles through the electrostatic attraction or diffusion. The adsorbed As(V) further interacted with –OH groups via ion exchange or with Y(III) on the surface of the adsorbent to form a precipitate. Therefore, the MST nanoparticles are promising for the removal of arsenic from water.
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
ANALYTICAL CHEMISTRY
·
2018
·
IF 6.042
Lin Yang,Ming Xuan Gao,Hong Yan Zou,Yuan Fang Li,Cheng Zhi Huang
Nature enzyme-based immunoassays have been widely used in fundamental scientific research and clinical diagnosis. However, the limitations of natural enzyme, such as the low physical/chemical stability or susceptibility to protein denaturation, greatly restrained its applications. In this article, we reported a new enzyme-free SERS immunoassay by utilizing plasmonic Cu2–xSySe1–y nanoparticles (NPs) as nanocatalyst to catalyze the click chemistry between the azido and alkynyl substrate which is used as the SERS signal reporter. The unique vibration of C≡C of alkynyl in the Raman-silent region (1800–2800 cm–1) is not overlapped with the signals of the other conventional Raman reporters or endogenous biological species, and thus it can make sure the enzyme-free SERS immunoassay has high selectivity and sensitivity. As a proof of concept, prostate-specific antigen (PSA), a biomarker of prostate cancer in blood, has been detected. The SERS immunoassay shows good analytical performance for PSA in the range of 3–120 ng mL–1, and it has been successfully applied to detect PSA in the serum samples of prostate cancer patients, proving that the proposed enzyme-free SERS immunoassay has great potential in the clinical diagnosis of cancer.
研究领域:
生物医学工程
·
癌症诊断
·
纳米技术
·
免疫学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2016
·Vol. 4
·期 24
·5584-5592
·
IF 5.066
Xiaolong Li,Shirong Wang,Yin Xiao,Xianggao Li
Based on Y-type titanylphthalocyanine nanoparticles (Y-TiOPc NPs) with an average diameter of 2.5 ± 0.6 nm, a trap-assisted ultrasensitive near-infrared organic photodetector (NIR OPD) has been successfully fabricated using the dip-coating process. The prepared OPD exhibited an obvious photomultiplication phenomenon with the highest external quantum efficiency (EQE) of 354 200%, an excellent photosensitivity with the maximum photoresponsivity (R) of 2227 A W−1, and an outstanding low-light detection with the highest normalized detectivity (D*) of 3.1 × 1014 Jones under 780 nm illumination with a low intensity of 0.1 μW cm−2 at +15 V μm−1. Such performances were attributed to the ultrasmall Y-YiOPc NPs with remarkable photosensitivity and a high surface-to-volume ratio which can enhance external hole tunneling injection assisted by trapped-electrons at the photoactive layer/ITO interface. The high EQE and R properties of the device, as well as the prompt, steady and reproducible photocurrent response during repeated on/off cycles of illumination, suggested that the prepared OPD was desired for ultrasensitive NIR detection. Therefore, the ultrasmall Y-TiOPc NPs proposed in this study showed great promising application in the large-area and low-cost solution process of ultrasensitive NIR OPDs.
研究领域:
材料科学
·
光学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
RARE METALS
·
2021
·Vol. 41
·期 2
·650-662
·
IF 4.003
Guo Hua,Li Jun,Zou Xian-Rui,Wang Hong-Shui,Kang An,Zhou Huan,Li Ming-Jun,Zhao Xiao-Yan
Abstract Development of photocatalytic materials able to profit from the whole spectrum of sun for efficient organic pollution removal and bacterial elimination is a fascinating strategy in environmental engineering. In current work, GO-TiO 2 /(Ca,Y)F 2 :Tm,Yb, a full-spectrum composite photocatalyst, was prepared via hydrothermal processing with TiO 2 /(Ca,Y)F 2 :Tm,Yb particles deposited on the surface of graphene oxide (GO). The surface properties of GO-TiO 2 /(Ca,Y)F 2 :Tm,Yb were characterized using various characterization techniques including X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and Brunauer–Emmett–Teller (BET) surface area analyzer. Besides, ultraviolet–visible (UV–Vis) diffuse reflectance spectroscopy, electron spin resonance (ESR) and other methods were used to systematically explore the photocatalytic mechanism of GO enhancement of TiO 2 /(Ca,Y)F 2 :Tm,Yb. In photocatalytic degradation study, the degradation rate of methyl orange (MO) was improved by 40% when GO was added into the TiO 2 /(Ca,Y)F 2 :Tm,Yb system. In addition, the presence of GO also improves the antibacterial ability of TiO 2 /(Ca,Y)F 2 :Tm,Yb against Escherichia coli and Staphylococcus aureus . All results reveal high efficacy of GO-TiO 2 /(Ca,Y)F 2 :Tm,Yb under full spectrum light irradiation, in which (Ca,Y)F 2 :Tm,Yb and TiO 2 can improve its utilization of full spectrum sunlight, and GO can enhance adsorption ability of dye and electron–hole pair differentiation ability of TiO 2 /(Ca,Y)F 2 :Tm,Yb. Graphic abstract
研究领域:
环境工程
·
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）