COLLOIDS AND SURFACES B-BIOINTERFACES
·
2020
·
IF 4.389
Fei Li,Jie Gao,Yijun Li,Xiwen He,Langxing Chen,Yukui Zhang
In this work, we proposed a facile strategy to prepare molecularly imprinted polymers (MIPs) modified Mn-doped ZnS quantum dots (QDs) as optosensing materials via sol-gel polymerization for specific recognition of celastrol (Cel) in traditional Chinese medicine (TCM). Firstly, L-Cysteine (L-Cys) modified Mn-doped ZnS QDs (L-Cys@Mn-ZnS) was used as imprinting substrate. The amino and carboxyl groups on the surface of Mn-ZnS QDs can provide more binding sites for imprinting polymerization. Then, the fluorescent MIPs was synthesized in the presence of L-Cys@Mn-ZnS QDs, template celastrol, 3-aminopropyl triethoxysilane (APTES) and ammonium hydroxide in the ethanol-water (9/1, v/v) solution. The morphology and structure of the products were characterized by transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffractometer (XRD) and X-ray photoelectron spectroscopy (XPS). The resulting MIPs functionalized Mn-doped ZnS QDs (denoted as MIPs@L-Cys@Mn-ZnS QDs) had higher imprinting factor of 14.19 and significant selectivity. The MIPs@L-Cys@Mn-ZnS QDs as fluorescent probe exhibited sensitive response to Cel in the linear range from 0.1 μM to 3.5 μM and the limit of detection was estimated to be 35.2 nM. The probe was also applied for the detection of Cel in traditional Chinese medicine with recovery ranged from 88.0%–105.0%. The results confirmed that MIPs@L-Cys@Mn-ZnS QDs could efficiently and specifically capture Cel from actual complex traditional Chinese medicine samples.
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Materials Advances
·
2021
·Vol. 3
·期 1
·272-281
·
IF 0
J. Cheng,P. Ganesan,Z. Wang,M. Zhang,G. Zhang,N. Maeda,J. Matsuda,M. Yamauchi,B. Chi,N. Nakashima
Perovskite oxides with a low cost and high catalytic activity are considered as suitable candidates for the oxygen evolution reaction (OER)/oxygen reduction reaction (ORR), but most of them favour only either the ORR or the OER. Besides, their underlying catalytic mechanisms are subject of an ongoing debate. Herein, La0.8Sr0.2CoO3−δ (LSC) was selected as a base perovskite oxide for doping different elements into its B-site to fabricate four different La0.8Sr0.2Co0.8M0.2O3−δ (LSCM; M = Ni, Fe, Mn, and Cu) perovskite oxides. Among the catalysts tested with and without multi-walled carbon nanotubes (MWNTs), La0.8Sr0.2Co0.8Fe0.2O3−δ (LSCF) outperformed any other catalysts in terms of both OER and ORR activity. The OER/ORR activity enhancement with LSCF is also discussed based on spectroscopic and microscopic analyses and lattice oxygen transportation.
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Advanced Optical Materials
·
2019
·Vol. 7
·期 23
·1901082
·
IF 7.125
Daqin Chen,Su Zhou,Feifan Tian,Haitao Ke,Naizhong Jiang,Shujin Wang,Yongzhao Peng,Yue Liu
Recently, Mn 2+ -doped CsPb(Cl/Br) 3 perovskite nanocrystals (NCs), showing the advantages of dual-color emissions via exciton-to-dopant energy transfer and reduced usage of toxic Pb 2+ heavy metal ions by nontoxic Mn 2+ substitution, are widely explored. However, photoluminescence quantum yields (PLQYs) for Mn 2+ -doped CsPb(Cl/Br) 3 NCs still need to be further improved. Here, a halogen-hot-injection strategy is developed to prepare Mn:CsPb(Cl 0.6 Br 0.4 ) 3 NCs with the maximal PLQY of 65%. With this method, intense blue narrowband emission from excitonic recombination and orange broadband emission from Mn 2+ 4 T 1 → 6 A 1 transition can be simultaneously achieved. The competitive luminescence between perovskite NCs and Mn 2+ dopants is systematically investigated by controlling the injected halogen types and ratios. As a proof-of-concept experiment, the present Mn 2+ -doped CsPb(Cl/Br) 3 perovskite NCs with highly efficient dual-color emissions are demonstrated to be applicable as color converter in UV-excitable solid-state lighting.
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Xinxin Zhang,Kang Hu,Xuliang Zhang,Wajid Ali,Zhijun Li,Yang Qu,Hao Wang,Qingyang Zhang,Liqiang Jing
In this work, an in-situ way has been developed to achieve the co-modification of highly-dispersed Mn and Cu oxides to g-C 3 N 4 nanosheets for efficient CO 2 reduction. The Mn & Cu amount-optimized nanosheets exhibit the improved photocatalytic activity for CO 2 reduction to CO and CH 4 both by 3 times compared with the generally-bulk g-C 3 N 4 , mainly attributed to the nanosheet structure and to the roles of modified Mn and Cu oxides. Based on the transient-state surface photovoltage responses, transient-state photoluminescence spectra, and electrochemical measurements, it is confirmed that the modified Mn and Cu oxides could respectively capture the photogenerated holes and electrons, and provide the catalytic functions for water oxidation and CO 2 reduction. Remarkably, the simultaneous introduction of Mn and Cu oxides shows an obvious synergistic effect on the improvement of photocatalytic activity for CO 2 reduction. This work provides a feasible way to synthesize high-activity g-C 3 N 4 -based photocatalysts for energy production.
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高影响因子
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
·
2019
·Vol. 645
·期 10
·745-751
·
IF 1.337
Xiaofang Li,Yuandong Wu,Dajiang Mei,Thomas Doert
Three new alkali metal transition metal sulfate-oxalates, RbFe(SO 4 )(C 2 O 4 ) 0.5 · H 2 O and Cs M (SO 4 )(C 2 O 4 ) 0.5 · H 2 O ( M = Mn, Fe) were prepared through hydrothermal reactions and characterized by single-crystal X-ray diffraction, solid state UV/Vis/NIR diffuse reflectance spectroscopy, infrared spectra, thermogravimetric analysis, and powder X-ray diffraction. The title compounds all crystallize in the monoclinic space group P 2 1 / c (no. 14) with lattice parameters: a = 7.9193(5), b = 9.4907(6), c = 8.8090(6) Å, β = 95.180(2)°, Z = 4 for RbFe(SO 4 )(C 2 O 4 ) 0.5 · H 2 O; a = 8.0654(11), b = 9.6103(13), c = 9.2189(13) Å, β = 94.564(4)°, Z = 4 for CsMn(SO 4 )(C 2 O 4 ) 0.5 · H 2 O; and a = 7.9377(3), b = 9.5757(4), c = 9.1474(4) Å, β = 96.1040(10)°, Z = 4 for CsFe(SO 4 )(C 2 O 4 ) 0.5 · H 2 O. All compounds exhibit three-dimensional frameworks composed of [ M O 6 ] octahedra, [SO 4 ] 2– tetrahedra, and [C 2 O 4 ] 2– anions. The alkali cations are located in one-dimensional tunnels.
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高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Kunlun Yang,Yuanli Liu,Yizhou Li,Zhen Cao,Chuchen Zhou,Zheni Wang,Xurui Zhou,Shams Ali Baig,Xinhua Xu
In this study, the selective adsorption performance of different Fe-Mn binary oxides (FMBOs) towards Sb(V) in the textile wastewater under different concentrations of coexisting anions, surfactants and dyes were investigated. Results showed that the influences of different anions on the Sb(V) removal followed an order of phosphate > carbonate > sulfate > nitrate > chloride. The frequently-used organic acid of acetate was found to have insignificant effect. The coexisting surfactant with sulfonic groups could have adverse effect on the removal due to sulfonic groups could compete the adsorptive sites on Fe oxides with Sb(V). While the quaternary ammonium surfactant might have minor effect. The influences of the three widely used dyes on the Sb(V) adsorption decreased in the following order: reactive black-5 >acid orange-7> disperse blue-60, which confirmed that the dyes with sulfonic groups would have relatively higher effect. The selective adsorption capacities of Sb(V) by FMBOs followed an order of FMBO 3 > FMBO 5 >FMBO 10 > FMBO 20 >PFO. Fixed-bed column adsorption supplied useful parameters and evidently indicated that the cyclic utilization of FMBO 3 was cost-efficient for practical dynamic Sb(V) removal. The Sb(V) removal by FMBO 3 from real textile wastewater can simultaneously improve the removal efficiency, stabilize pH and prevent the increase of iron concentration as compared to the traditional coagulation, further demonstrating the high practical applicability of FMBO 3 .
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MATERIALS CHEMISTRY AND PHYSICS
·
2019
·
IF 2.781
Tianyu Cai,Li Yuan,Guozheng Liang,Hong Wang,Aijuan Gu
Achieving lower curing temperature and higher properties has been the significant target for developing heat-resistant thermosetting resins . Herein, a facile covalent approach has been built to fabricate functionalized graphene oxide (HBP@GO/MnF) through grafting hyperbranched polysiloxane (HBP) and hybridizing metal–organic framework with Mn 2+ (MnF), which has been proved to have desirable abilities of simultaneously decreasing curing temperature as well as improving toughness and stiffness while maintaining the biggest advantage (low dielectric loss) and high thermal resistance of cyanate ester (BCy) resin. A comparative study demonstrates that the activation from HBP endows HBP@GO/MnF with good dispersion in BCy resin and provides strong interfacial action between HBP@GO/MnF and BCy resin. When the loading of HBP@GO/MnF is as small as 0.5 wt%, the peak temperature of curing reduces to 278 °C from 313 °C of BCy, meanwhile severally about 60%, 98%, 120% and 93% increased flexural strength , flexural modulus, impact strength and fracture toughness are achieved. In addition, all modified BCy resins post-cured at 220 °C/4 h have better mechanical properties and higher heat resistance than pure BCy resin post-cured at 240 °C for 4 h. These outstanding performances prove that HBP@GO/MnF is promising filler for fabricating new resins with higher performances and better curing feature.
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MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 10
·1-8
·
IF 5.705
Pang Jiawei,Lu Yuexiang,Gao Xinyu,Song Panshu,Yang Fengyi,Liu Yueying
A selective phosphorescent on-off-on probe with long decay lifetime has been designed for the detection of pyrophosphate ions (PPi). The detection scheme is based on the use of europium(III)-modulated Mn(II)-doped ZnS quantum dots capped with N-acetyl-L-cysteine. Both the aggregation of quantum dots and electron transfer induced by Eu(III) ions cause phosphorescence to be quenched (“off” state). Phosphorescence is, however, restored on addition of PPi to the system (“on” state). The effect is attributed to the removal of Eu(III) from the carboxy groups on the surface of the quantum dots owing to the stronger interaction between PPi and Eu(III). A linear relationship exists between phosphorescence intensity (best measured at excitation/emission wavelengths of 316/594 nm) and PPi concentration in the 400 nM to 6000 nM with a detection limit of 145 nM. An additional attractive feature is provided by the long-lived phosphorescence (1920 μs) of the quantum dots. It can be used to eliminate interference by short-lived fluorescence in biological samples by performing time resolved measurements. The probe was applied to the determination of PPi in spiked in urine samples and gave recoveries in the range from 98 to 105% with RSDs of <2.0%.
Schematic of a long-lived phosphorescent on-off-on probe for the sensitive and selective detection of pyrophosphate ions (PPi). It is based on the use of Eu(III)-modulated Mn(II)-doped ZnS quantum dots (QDs). Phosphorescence is quenched of QDs after the addition of Eu 3+ but restored after the addition of PPi.
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CHINESE JOURNAL OF CATALYSIS
·
2015
·
IF 1.964
Xin Zhao,Lei Huang,Hongrui Li,Hang Hu,Jin Han,Liyi Shi,Dengsong Zhang
Different transition metals were used to modify V 2 O 5 -based catalysts (M-V, M = Cu, Fe, Mn, Co) on TiO 2 via impregnation, for the selective reduction of NO with NH 3 . The introduced metals induced high dispersion in the vanadium species and the formation of vanadates on the TiO 2 support, and increased the amount of surface acid sites and the strength of these acids. The strong acid sites might be responsible for the high N 2 selectivity at higher temperatures. Among these catalysts, Cu-V/TiO 2 showed the highest activity and N 2 selectivity at 225–375 °C. The results of X-ray photoelectron spectroscopy, NH 3 -temperature-programmed desorption, and in-situ diffuse reflectance infrared Fourier transform spectroscopy suggested that the improved performance was probably due to more active surface oxygen species and increased strong surface acid sites. The outstanding activity, stability, and SO 2 /H 2 O durability of Cu-V/TiO 2 make it a candidate to be a NO x removal catalyst for stationary flue gas.
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高影响因子
CHEMOSPHERE
·
2024
·
IF 8.1
Yanfang Huang,Meimei Wang,Bingbing Liu,Shengpeng Su,Hu Sun,Shuzhen Yang,Guihong Han
Ion precipitation flotation technology was demonstrated to be an efficient method for the separation of valuable metals from low-concentration solution. However, the selective separation of three metals from mixing solution is a great challenge, and highly selective reagents are the key to polymetallic separation. In this work, stepwise separation of Co and Zn from the simulated zinc hydrometallurgy wastewater containing ternary Co–Zn–Mn metals by ion precipitation flotation process was proposed. It's demonstrated that organic reagents of 1-nitroso-2-naphthol (NN) and sodium dimethyldithiocarbamate (SDDC) had excellent selectivity for the capture of Co and Zn to form respective precipitate from wastewaters via the chelation reactions. After precipitation, dodecylpyridinium chloride (DPC) and tetradecyltrimethylammonium bromide (TTAB) were chosen as surfactants for the separation of Co and Zn sediments from the solution via the flotation process. The effects of solution pH, molar ratio, reaction temperature, and reaction time on the selective precipitation efficiencies of Co and Zn as well as the effects of surfactant dosage and flotation gas velocity on the flotation separation efficiencies were systematically investigated. It's demonstrated that the comprehensive recovery rates of Co, Mn, and Zn reach 98%, 90%, and 99%, respectively. After separation, oxidation calcination of the foam products was conducted to prepare high-purity Co 3 O 4 and ZnO nanoparticles in which the organic matters were burnt out with gas emissions. The stepwise chelation capture mechanisms of Co and Zn by highly selective precipitation reagents were minutely discussed. It's demonstrated that the proposed selective stepwise precipitation and flotation method is suitable for recovery of critical metal ions from low-concentration polymetallic wastewaters.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Yang Yao,Lin Cao,Haoyue Yang,Raz Muhammad,Yingjie Ren,Xinjiang Luo,Fayaz Hussain,Bing Liu,Minmin Mao,Hadi Barzegar Bafrooei,Ehsan Taheri-Nassaj,Kaixin Song
In this study, high-entropy Mg 1.8 R 0.2 Al 4 Si 5 O 18 (R Ni, Ni 1/2 Co 1/2 , Ni 1/3 Co 1/3 Zn 1/3 , Ni 1/4 Co 1/4 Zn 1/4 Cu 1/4 , Ni 1/5 Co 1/5 Zn 1/5 Cu 1/5 Mn 1/5 ) cordierite ceramics based on equimolar ratios were designed and synthesized through the solid-state reaction technique at high temperatures. The effect of various R-ionic substitutions at the octahedral site and their relationship with ionic polarization, chemical bonding, and configurational entropy were explored. These factors have greatly affected the microwave dielectric properties of Mg 1.8 R 0.2 Al 4 Si 5 O 18 ceramics. The presence of cation radius mismatch and electronegativity mismatch at [MgO 6 ]-octahedron lattice sites revealed lattice distortion resulting from multiple cation substitutions. As the entropy values increased, the temperature stability of microwave dielectric properties of Mg 1.8 R 0.2 Al 4 Si 5 O 18 ceramics improved. For R Ni 1/2 Co 1/2 , a higher Q×f of approximately 73,658 GHz @ 13 GHz, with ɛ r ∼4.44 and τ f ∼ −23.9 ppm/°C was obtained. In the case of R Ni 1/5 Co 1/5 Zn 1/5 Cu 1/5 Mn 1/5 , a near zero τ f (−10.7 ppm/°C), ɛ r = 4.68 and Q×f = 35,478 GHz @13 GHz were achieved, making it potentially suitable for practical applications.
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高影响因子
CHEMOSPHERE
·
2024
·
IF 8.1
Haishuo Wang,Xuefeng Ge,Shiyin Li,Heyong Huang
Dissolved organic matter (DOM) plays an important role in metal migration and transformation within inland surface waters . In our study, spectroscopic and dialysis equilibrium analysis were combined to characterize the binding properties between DOM and Fe(II)/Mn(II). Four different type of DOM including two commercial DOM: humic acid、fulvic acid, and two natural dissolved organic matter collected from macrophyte-dominant region (MDR) and algae-dominated region (ADR) of Taihu Lake. Steady state/time resolved fluorescence spectroscopy indicated that the fluorescence intensity of DOM was quenched by Fe(II)/Mn(II) through a static quenching process. The adsorption isotherm shows that the adsorption capacity of DOM from Taihu Lake for metal ions is significantly higher than that of commercial humic acid . Simultaneously, the combination of MDR and Fe(II) has the highest adsorption capacity at 110.950 mg/g among all combinations. Furthermore, the Pseudo-second-order kinetic model and Elovich model were found to be superior in describing the adsorption process , with chemical adsorption controlling the rate of the adsorption reaction. The results of this study show that potentially toxic elements (PETs) pollution in eutrophic shallow lakes may become more serious due to the excessive expansion of algae dominant regions and the reduction of macrophyte dominant regions. In addition, risk analysis and assessment of PETs should consider the contribution of metal binding capabilities.
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危险品化学品经营许可证（带存储）