MICROCHIMICA ACTA
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2019
·Vol. 186
·期 6
·1-8
·
IF 5.479
Li Chunmei,Zheng Youkun,Ding Hongwei,Jiang Hui,Wang Xuemei
We report on the synthesis of chromium(III)-doped carbon dots (Cr-CDs) by one-pot hydrothermal pathway using tris(2, 4-pentanedionato) chromium(III) and polyethyleneimine as precursors. The Cr-CDs have a graphene-analogous structure and display blue-green fluorescence with excitation/emission maxima at 350/466 nm, a 20% quantum yield, and excitation-independent emissions. Their cytotoxicity is low. The Cr-CDs were used as a fluorescence probe for p -nitrophenol ( p -NP). The assay has a linear working range that extends from 0.8~150 μM and a 0.27 μM lower detection limit. The assay was applied to the detecting of p -NP in spiked human urine, and conceivably may be extended to a method for the determination of parathion.
Schematic presentation for the synthesis of Cr-CDs (chromium(III)-doped carbon dots) and their application to the fluorometric determination of p -NP ( p -nitrophenol) based on an inner filter effect.
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 5
·1-8
·
IF 5.479
Zhao Chen,Hong Cheng-yi,Lin Zheng-zhong,Chen Xiao-mei,Huang Zhi-Yong
A specific and sensitive colorimetric aptasensor is described for the determination of Malachite Green (MG). It is exploiting the inhibition of the peroxidase-like activity of gold nanoparticles (AuNPs). The AuNPs act as enzyme mimics that catalyze the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) by H 2 O 2 to yield a dark blue solution. The catalytic activity is inhibited by hexadecyl trimethyl ammonium ion, specifically by cetyltrimethylammonium bromide (CTAB), which causes the aggregation of AuNPs. If a (negatively charged) RNA-aptamer against MG is added, it binds to the positively charged CTAB and prevents aggregation. This enhances the enzyme mimicking activity of the AuNPs and leads to the formation of a dark blue solution. However, in the presence of MG, the aptamer binds to MG, and leads to the aggregation of AuNPs again. The aggregated AuNPs possess a light blue color. A colorimetric method (best performed at 650 nm) was work out that can detect MG in a concentration range from 10 to 500 nmol L −1 . The detection limit based on 3σ/k criterion is 1.8 nmol L −1 . The assay is highly specific and accurate. Recoveries from spiked real samples (aquaculture water) ranged from 80% to 120%.
Based on the inhibition of cetyltrimethyal ammonium ion and the enhancement of RNA-aptamer, the differences of the peroxidase-like activities of AuNPs can be greatly enlarged with and without MG, by which a colorimetric aptasensor can be constructed for the detection of Malachite Green (MG).
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Nature Communications
·
2019
·Vol. 10
·期 1
·1-10
·
IF 11.878
Yang Bo,Pan Weicheng,Wu Haodi,Niu Guangda,Yuan Jun-Hui,Xue Kan-Hao,Yin Lixiao,Du Xinyuan,Miao Xiang-Shui,Yang Xiaoquan,Xie Qingguo,Tang Jiang
X-ray detectors are broadly utilized in medical imaging and product inspection. Halide perovskites recently demonstrate excellent performance for direct X-ray detection. However, ionic migration causes large noise and baseline drift, limiting the detection and imaging performance. Here we largely eliminate the ionic migration in cesium silver bismuth bromide (Cs 2 AgBiBr 6 ) polycrystalline wafers by introducing bismuth oxybromide (BiOBr) as heteroepitaxial passivation layers. Good lattice match between BiOBr and Cs 2 AgBiBr 6 enables complete defect passivation and suppressed ionic migration. The detector hence achieves outstanding balanced performance with a signal drifting one order of magnitude lower than all previous studies, low noise (1/ f noise free), a high sensitivity of 250 µC Gy air −1 cm –2 , and a spatial resolution of 4.9 lp mm −1 . The wafer area could be easily scaled up by the isostatic-pressing method, together with the heteroepitaxial passivation, strengthens the competitiveness of Cs 2 AgBiBr 6 -based X-ray detectors as next-generation X-ray imaging flat panels.
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IONICS
·
2019
·Vol. 25
·期 8
·3859-3866
·
IF 2.289
Bao Wentao,Tian Hua,Jiang Yang,Zhu Kaixin,Zhang Runa,Tan Yu,Li Wang,Yu Zhifeng,Wang Lin
Ni–Al layered double hydroxide with nitrate anions as interlayer building blocks was synthesized by a dual-anion intercalating strategy of hydroxyl and nitrate anions during a facile co-precipitation process. In this case, nitrate anions with low charge densities are capable to expand the interplanar spacing between host layers of Ni–Al layered double hydroxide in the replacement of pristine carbonate anions, benefiting to the diffusion of electrolyte ions to active sites within electrodes. Moreover, the optimization for packed arrangement of Ni–Al layered double hydroxide with nitrate anions nanosheets can be effectively realized by modulating reactant concentrations, leading to the formation of nanolayered structure in favor of increasing electrolyte accessible active sites within electrodes. The optimized Ni–Al layered double hydroxide with nitrate anions achieves a high specific capacitance of 1616 F g −1 at 1 A g −1 together with a capacitance retention of 82% at 10 A g −1 and good cycling stability.
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TRIBOLOGY LETTERS
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2019
·Vol. 67
·期 3
·1-11
·
IF 2.235
Chang Qiuying,Zhang Hao,Gao Rongqin
Nanocomposite lubricant additive consisting of Magnesium silicate hydroxide and amorphous carbon (MSH@C) was prepared. Amorphous carbon in the nanocomposite of MSH@C was obtained by hydrothermal decomposition of polytetrafluoroethylene (PTFE) under subcritical water condition. The MSH@C was characterized by Scanning electron microscope, X-ray diffractometer, Fourier transform infrared spectrometer, Raman spectrometer, and X-ray photoelectron spectrometer. The analysis results show that addition of PTFE in the process of synthesizing MSH can inhibit the tubular crystallization of MSH@C powder. Tribological experiments show that the doping of amorphous carbon materials can significantly enhance the friction reduction and wear resistance of nanocomposite powders as lubricant additive, and is superior to MSH and fully formulated commercial lubricant 5W30. The tribofilm on the worn balls including amorphous carbon originated from MSH@C nanoparticles accounts for the significant tribological properties.
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3 Biotech
·
2019
·Vol. 9
·期 7
·1-10
·
IF 1.786
Gao Jing,Chen Cuili,Wang Liyuan,Lei Youfeng,Ji Hongwu,Liu Shucheng
Pretreatment of lignocellulosic biomass with ionic liquids (ILs) for the large-scale biorefinery remains challenging due to its high price. This study focused on the utilization of inorganic salts as adjuvants for ionic liquid–water pretreatment to improve the tolerance to water and the reusability of the ILs. After the pretreatment of rice straw by the mixture of 40% 1-ethyl-3-methylimidazolium chloride ([C 2 mim]Cl) + 53% water + 7% K 2 CO 3 at 110 °C for 1 h, the residues became highly susceptible to enzymatic hydrolysis; 93.70% of lignin was removed, and 92.07% sugar yield was achieved. [C 2 mim]Cl-K 2 CO 3 aqueous biphasic system was formed at room temperature when K 2 CO 3 concentration increased to more than 30%, and the [C 2 mim]Cl recovery of 94.32% was achieved. The results indicate that the addition of inorganic salts to IL aqueous solutions can significantly reduce the cost of IL pretreatment, while maintaining an efficient enzymatic hydrolysis of lignocellulosic biomass.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2019
·Vol. 35
·期 3
·382-389
·
IF 1.071
Wang Chengke,Tan Rong,Li Jiangyu,Zhang Zexiang
A double magnetic separation-assisted fluorescence method was developed to rapidly detect ochratoxin A(OTA). The OTA aptamer functionalized magnetic nanomaterial(Fe 3 O 4 -Aptamer) and complementary DNA conjugated nitrogen-doped graphene quantum dots(NGQDs-cDNA) were used in this assay. Aptamer could hybridize with cDNA, which induced the NGQDs-cDNA to bind onto Fe 3 O 4 -Aptamer, and resulted in the fluorescence quenching of NGQDs. After the addition of OTA, the NGQDs-cDNA could release into the solution, and resulted in the recovery of fluorescence signal of NGQDs consequently. By utilizing the magnetic separation, the unbonded NGQDs-cDNA and residual Fe3O4-Aptamer were removed, which significantly increased the fluorescence signal intensity. OTA could be detected in the linear range of 10 nmol/L to 2000 nmol/L, with a limit of detection as 0.66 nmol/L. The advantages of this method include simple operation, good selectivity and high sensitivity, and this method can be used for the rapid detection of ochratoxin A in wheat and corn.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2019
·Vol. 30
·期 12
·11108-11116
·
IF 2.195
Jiang Xishun,He Wenjun,Zheng Shaokang,Shi Yonghua,Sun Zhaoqi
A series of TiO 2 nanostructures with rutile phase were synthesized on arbitrary substrates of conductive transparent fluorine-doped tin oxide (FTO), tin-doped indium oxide (ITO), and glass at the low temperature of 150 °C by the hydrothermal method. The samples were characterized by XRD, SEM, TEM, XPS, UV–Vis absorption, and micro-Raman spectroscopy. The effects of growth substrates on the morphologies and optical properties of nanostructures were investigated. TiO 2 nanorods were grown on the FTO substrate, while TiO 2 nanoflowers were grown on the ITO and glass substrates, and the growth mechanism for these different nanostructures is discussed in detail. The results show that the TiO 2 nanorods can improve photocatalytic properties and photoelctrochemical (PEC) performance for its unique structure and optical properties. The TiO 2 nanorods exhibited a maximal photocatalytic rate of 4.42 min −1 and photocurrent density of 0.049 mA/cm 2 , which is about 1.52 and 3.03 times higher than those of TiO 2 nanoflowers grown on the ITO substrates, respectively. These findings are quite promising and encouraging for the use of TiO 2 nanoarrays in photocatalysis and energy applications.
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Nano-Micro Letters
·
2019
·Vol. 11
·期 1
·1-13
·
IF 9.043
Zhao Shuai,Sun Shan,Jiang Kai,Wang Yuhui,Liu Yu,Wu Song,Li Zhongjun,Shu Qinghai,Lin Hengwei
Multifunctional nanocarrier-based theranostics is supposed to overcome some key problems in cancer treatment. In this work, a novel method for the preparation of a fluorescent mesoporous silica–carbon dot nanohybrid was developed. Carbon dots (CDs), from folic acid as the raw material, were prepared in situ and anchored on the surface of amino-modified mesoporous silica nanoparticles (MSNs–NH 2 ) via a microwave-assisted solvothermal reaction. The as-prepared nanohybrid (designated MSNs–CDs) not only exhibited strong and stable yellow emission but also preserved the unique features of MSNs (e.g., mesoporous structure, large specific surface area, and good biocompatibility), demonstrating a potential capability for fluorescence imaging-guided drug delivery. More interestingly, the MSNs–CDs nanohybrid was able to selectively target folate receptor-overexpressing cancer cells (e.g., HeLa), indicating that folic acid still retained its function even after undergoing the solvothermal reaction. Benefited by these excellent properties, the fluorescent MSNs–CDs nanohybrid can be employed as a fluorescence-guided nanocarrier for the targeted delivery of anticancer drugs (e.g., doxorubicin), thereby enhancing chemotherapeutic efficacy and reducing side effects. Our studies may provide a facile strategy for the fabrication of multifunctional MSN-based theranostic platforms, which is beneficial in the diagnosis and therapy of cancers in future.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 15
·15710-15723
·
IF 2.914
Wang Yuxiong,Rao Lei,Wang Peifang,Guo Yong,Guo Xiang,Zhang Lixin
In order to overcome photocatalytic technology application limitations in water due to weak light intensity, it is crucial to synthesize photocatalysts that respond to weak light. In this study, porous and oxygen-doped carbon nitride (CN-MC) was synthesized via supramolecular preassembly technology using melamine and cyanuric chloride. The carbon nitride catalyst produced via this technology has a relatively high surface area (63.2 m 2 g −1 ), irregular pores, and oxygen doping characteristics, which enhance the light capture capacity, increase the number of reactive sites, and accelerate electron–hole separation efficiency. Thus, the CN-MC exhibited excellent photocatalytic activity during the degradation of organic pollutants Rhodamine B (RhB, 95% removal within 6 h) and tetracycline hydrochloride (TC-HCl, 70% removal within 6 h) under low-intensity light (the light intensity = 0.8~1.8 mW cm −2 with a wavelength range of 300–700 nm). Mechanistic analysis showed that ·O 2 − and ·OH were the dominant active free radicals during RhB and TC-HCl photocatalytic degradation over CN-MC. The proposed synthesis strategy effectively improves the photocatalytic activity of graphite carbon nitride under weak light by producing a porous morphology and oxygen atom doping.
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SN Applied Sciences
·
2019
·Vol. 1
·期 5
·1-10
·
IF 0
Wang Longlong,Weng Yujing,Duan Peigao,Liu Xianyun,Wang Xiaolong,Zhang Yulong,Wang Chenguang,Liu Qiying,Ma Longlong
Sorbitol was reported as one promising platform compounds as a C6 sugar related derivative from biomass cellulose due to its high oxygen content with six hydroxyl groups. Our previous work has reported the selective hydrodeoxyenation (HDO) of sorbitol into long alkanes such as pentane and hexane (C5/C6) over carbon supported ruthenium-molybdenum catalysts. Here, the effect of acidic pretreatments of those carbon catalysts on the performance of HDO reaction was studied in detailed. The result indicated that carbon support pretreated by phosphoric acid presented much phosphorus groups, but the carbon support pretreated by nitric acid presented high graphitization degree. Moreover, the phosphoric acid pretreated catalyst (RuMo/C–P) obtained high HDO performance in the sorbitol conversion with 79.7% carbon yield of C5/C6 alkane (pentane and hexane). Finally, detailed characterizations (N 2 -adsorption, XRD, HRTEM, XPS, XRF, Raman, NH 3 -TPD, Py-IR spectrums, etc.) were performed over relevant catalysts for correlating their catalytic and physicochemical properties.
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RARE METALS
·
2019
·Vol. 38
·期 5
·379-389
·
IF 1.785
Ji Jia-Hui,Xiao Yi-Fei,Shen Bin,Yi Qiu-Ying,Zhang Jin-Long,Xing Ming-Yang
The recovery of heterogeneous catalysts can save costs and avoid secondary pollution, but its separation efficiency and recovery cost are limited by conventional separation methods such as precipitation–flocculation, centrifugation and filtration. In this paper, we found that surface-defective metal sulfides/oxides (WS 2 , CuS, ZnS, MoS 2 , CdS, TiO 2 , MoO 2 and ZnO) commonly used in advanced oxidation processes (AOPs) could be magnetically recovered at room temperature and atmospheric pressure by mechanically mixing with Fe 3 O 4 . Zeta potential, Raman, X-ray photoelectron spectroscopy (XPS) and electro-spin resonance (ESR) spectra were measured to explore the mechanism of the magnetic separation phenomenon. The exposed active metal sites on the surface of defective metal sulfides/oxides are beneficial for the formation of chemical bonds, which are combined with electrostatic force to be responsible for the magnetic separation. Moreover, other factors affecting the magnetic separation were also investigated, such as the addition of amount of Fe 3 O 4 , different solvents and particle sizes. Finally, WS 2 was chosen to be applied as a co-catalyst in Fenton reaction, which could be well separated by the magnetic Fe 3 O 4 to achieve the recycle of catalyst in Fenton reaction. Our research provides a general strategy for the recycle of metal sulfides/oxides in the catalytic applications.
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