COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2017
·
IF 2.714
Jian-Rong Li,Lei Xu,Ming-Lai Fu,Huachun Lan
The layered chalcogenide has been shown to efficiently absorb organic pollutant, as well as heavy metals and radioactive ions. Previous studied showed that the regeneration of spent layered chalcogenide was impossible because of the strong affinity between soft metal ions and sulfur ions. While can adsorbent of layered chalcogenide be regenerated for adsorption of organic pollutant? In this study a case study of norfloxacin (NOR) adsorbed by layered chalcogenide in water is illustrated. The typical layered chalcogenide, K 1.9 Mn 0.95 Sn 2.05 S 6 (KMS-1) was hydrothermally synthesized and then used to remove NOR in aqueous solution. The adsorption process was found strongly pH-dependent. The maximum adsorption capacities were obtained at pH of 4 at different temperatures. The shift of Bragg peaks indicated from XRD patterns at different pH accompanying SEM images and adsorption amount showed that cation exchange played an essential role to remove NOR. The intercalation of cationic NOR took titled orientations of di-molecular NOR in KMS-1 with the interlayer space of 1.38 nm and 0.97 nm, respectively. The KMS-1 intercalated with NOR can be successfully regenerated by cation exchange using high concentration (1.0 M) KCl solution, in which the decrease in adsorption capacity was found <10% after three adsorption – desorption cycles. The obtained results suggested layered chalcogenide could be a promising regenerated adsorbent to remove organic pollutant with potential application in the environmental remediation.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2017
·
IF 2.714
Yun-Xia Wang,Kiran Gupta,Jian-Rong Li,Baoling Yuan,Jia-Cheng E. Yang,Ming-Lai Fu
A novel easily separated magnetic chalcogenide composite, KMS-1/L-Cystein/Fe 3 O 4 (KCF), was successfully synthesized using bifunctional linker (L-Cystein) to connect KMS-1 and Fe 3 O 4 nanoparticles, and was examined to remove ciprofloxacin (CIP) from aqueous solution. The composite was thoroughly characterized by XRD, SEM, EDX, FTIR and magnetization measurements techniques. The adsorption experiments were carried out and investigated under different conditions, such as contact time and pH of solution. The CIP removal reaction was found to better follow a pseudo-second-order kinetic model than the pseudo-first-order. The Langmuir adsorption isotherm was employed to understand the removal process. The pH of solution is critical for the adsorption of CIP on KCF, and the maximum adsorption (181.32 mg/g) of CIP could be reached under pH 6. In addition, the KCF adsorbent showed magnetization and operational stability, and it could be readily separated from solution by applying an external magnetic field. The high stability, performance, inexpensive, and easily recyclable KCF composite may serve as a promising adsorbent for water treatment.
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Science Advances
·
2024
·Vol. 10
·期 40
·
IF 11.7
Zhongliang Huang,Yingru Wang,Jing Xia,Shengnan Hu,Nanjun Chen,Tianyi Ding,Changhong Zhan,Chih-Wen Pao,Zhiwei Hu,Wei-Hsiang Huang,Tong Shi,Xiangmin Meng,Yong Xu,Liang Cao,Xiaoqing Huang
Pt-based nanoparticles (NPs) have been widely used in catalysis. However, this suffers from aggregation and/or sintering at working conditions. We demonstrate a robust strategy for stabilizing PtCo NPs under high temperature with strong interaction between M–N–C and PtCo NPs with Pt–M–N coordination, namely, “atom glue.” Such atom glue for stabilizing Pt-based NPs can be extended to Zn, Mn, Fe, Ni, Co, and Cu, being a versatile strategy for stabilizing PtCo NPs, which substantially promotes the performance toward oxygen reduction reaction (ORR) and fuel cell. Impressively, the mass activity (MA) reaches 2.99 A mgPt−1 for ORR over g-Zn–N–C/PtCo, and 79.3% of the initial MA is maintained after 90K cycles in fuel cell. This work provides a versatile strategy for stabilizing Pt-based NPs via atom glue, which is likely to spark widespread interest across various fields.
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PubMed
高影响因子
ADVANCED MATERIALS
·
2024
·Vol. 36
·期 39
·2404772
·
IF 27.4
Ning Sun,Zhichuan Zheng,Zhuangzhuang Lai,Junjie Wang,Peng Du,Tianping Ying,Haifeng Wang,Jianchun Xu,Runze Yu,Zhiwei Hu,Chih-Wen Pao,Wei-Hsiang Huang,Ke Bi,Ming Lei,Kai Huang
While high-entropy alloys, high-entropy oxides, and high-entropy hydroxides, are advanced as a novel frontier in electrocatalytic oxygen evolution, their inherent activity deficiency poses a major challenge. To achieve the unlimited goal to tailor the structure–activity relationship in multicomponent systems, entropy-driven composition engineering presents substantial potential, by fabricating high-entropy anion-regulated transition metal compounds as sophisticated oxygen evolution reaction electrocatalysts. Herein, a versatile 2D high-entropy metal phosphorus trisulfide is developed as a promising and adjustable platform. Leveraging the multiple electron couplings and d–p orbital hybridizations induced by the cocktail effect, the exceptional oxygen evolution catalytic activity is disclosed upon van der Waals material (MnFeCoNiZn)PS 3 , exhibiting an impressively low overpotential of 240 mV at a current density of 10 mA cm −2 , a minimal Tafel slope of 32 mV dec −1 , and negligible degradation under varying current densities for over 96 h. Density functional theory calculations further offer insights into the correlation between orbital hybridization and catalytic performance within high-entropy systems, underscoring the contribution of active phosphorus centers on the substrate to performance enhancements. Moreover, by achieving electron redistribution to optimize the electron coordination environment, this work presents an effective strategy for advanced catalysts in energy-related applications.
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MATERIALS & DESIGN
·
2016
·
IF 3.997
Xinjian Cheng,Yun Yu,Yiru Jia,Lian Duan
Three small molecular boron dipyrromethene (BODIPY) derivatives (B3a, B3b and B3c) were well-designed and synthesized at first, and then were incorporated into polyurethane to obtain macromolecular fluorescent sensors. These small molecular BODIPY derivatives exhibited high sensitivity and selectivity to Hg 2 + , Cr 3 + and Fe 3 + ions. The colors of these chemicals changed rapidly upon the addition of Hg 2 + , Cr 3 + and Fe 3 + ions. In addition, their fluorescence peaks shifted and was enhanced as well. B3a, B3b and B3c still remained the sensing properties when being introduced to polyurethane (PU). The functionalized PU films not only showed color change and fluorescence shift for detecting Hg 2 + , Cr 3 + and Fe 3 + ions as their small molecular counterparts, but also triggered a new emission peak in 500–600 nm. Besides, the functionalized PU film (PU-B3a as a sample) could absorb Hg 2 + ions more than 84 mg/g in unit time and volume. It suggested that as long as the structure of the small molecular sensor was remained, the fluorescent ability remained even it is introduced to the macromolecular chains. In addition, Glass transition temperature (T g ) of the PU films changed when B3a, B3b and B3c were introduced.
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JOURNAL OF ASIA-PACIFIC ENTOMOLOGY
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2017
·
IF 1.046
Yunhua Zhang,Jinyun Ji,Xiao Zhao,Ruoheng Jin,Jianhong Li,Hu Wan
A previous study demonstrated that a β- N -acetyl- d -hexosaminidase ( NlHex4 ) from the brown planthopper could serve as a new potential target for biopesticides due to its requirement for molting, and lethal phenotypes were observed via RNA interference . However, the enzymatic properties of NlHex4 remain unclear. In the present study, NlHex4 was expressed, purified and characterized. Recombinant NlHex4 was functionally expressed in baculovirus-infected insect cells and purified with a molecular weight of approximately 70 kDa. Recombinant NlHex4 had an optimal pH and temperature of 6.0 and 60 °C, respectively. Moreover, recombinant NlHex4 exhibited thermal stability at 50 °C for at least 1 h. Furthermore, the activity of recombinant NlHex4 was inhibited by the metal ions Fe 2 + and Fe 3 + and the serine protease inhibitor phenylmethanesulfonyl fluoride. These results reveal the enzymatic properties of NlHex4 and provide a basis for future investigation of the interaction between HEX and chitin oligosaccharide .
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2015
·
IF 3.368
Jian-Rong Li,Yun-Xia Wang,Xu Wang,Baoling Yuan,Ming-Lai Fu
The hydrothermally synthesized layered chalcogenide, K 2 x Mn x Sn 3− x S 6 ( x = 0.5–0.95) (KMS-1), was applied to remove ciprofloxacin from aqueous solution. Kinetic data showed the removal reaction followed a pseudo-second-order kinetic model and the rate controlling step was both through external film and intraparticle diffusion . The adsorption of CIP by KMS-1 is endothermic and the maximum adsorption capacity of KMS-1 was 199.6, 230.9 and 269.5 mg/g at temperature of 10, 25 and 40 °C, respectively. The heavy metal ions had great effect on the removal efficiency of CIP and the degree of inhibition followed the order: Pb 2+ > Zn 2+ > Cd 2+ > Ni 2+ . The shift of Bragg peaks from XRD at various pH accompanying CIP removal and FE-SEM images confirmed that cation exchange is the major mechanism for the adsorption of CIP by KMS-1. In the pH range of 4.0–7.0, the intercalation of cationic CIP adopted a titled orientation of di-molecular CIP in KMS-1 with the titling angle of 68° and 42°, respectively. A vertical arrangement of the zwitterionic CIP adsorbed on the surface of KMS-1 was also confirmed. These results suggested that KMS-1 is an effective adsorbent to remove CIP from water.
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PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2014
·
IF 2.083
Jian-Rong Li,Xu Wang,Baoling Yuan,Ming-Lai Fu
The layered chalcogenide, K 2x Mn x Sn 3− x S 6 (x = 0.5 –0.95), which exhibited excellent adsorption properties for removal of Cu 2 + from aqueous solution, was synthesized hydrothermally. X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and energy dispersive spectrometer (EDS) were used to characterize the crystal structure, chemical composition and micro-morphologies of KMS-1 before and after adsorption. Cu 2 + can covalently bond with sulfur atoms after it exchanged with K + . The interlayer spacing of KMS-1 was changed from 0.851 nm to 0.592 nm after adsorption. The sizes of KMS-1 crystalline after adsorption changed to smaller. The effects of pH, reaction time, initial concentration, reaction temperature and coexisting ions on the adsorption of Cu 2 + by KMS-1 were studied. The pH was found to be a slight factor determining adsorption capacity at pH from 3 to 6. Kinetic data were fitted well to a pseudo-second-order kinetic model and the rate controlling steps were external film diffusion and intraparticle diffusion at different temperatures. The activation energy for the adsorption process was estimated to be 45.15 kJ/mol. The maximum adsorption capacity of KMS-1 was 164.7, 155.6 and 152.7 mg/g at a temperature of 10, 25 and 40 °C, respectively. The Langmuir adsorption isotherm was used to fit the adsorption equilibrium process. The alkaline and alkaline earth metal ions had slight effect on the removal efficiency of Cu 2 + and the degree of inhibition followed the order: Ca 2 + > Mg 2 + > Na + . The heavy metal ions had great effect on the removal efficiency of Cu 2 + and the degree of inhibition followed the order: Cd 2 + > Pb 2 + > Zn 2 + > Ni 2 + . The adsorbed KMS-1 can be considered as an excellent permanent waste storage without the risk of leaching of Cu 2 + .
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2014
·Vol. 30
·期 3
·362-367
·
IF 1.119
Cao Li,Jia Chunman,Zhang Qi,Chen Da,Zhang Chunyan,Qian Yaao
A fluorescent probe with a coumarin moiety bound to rhodamine 6G hydrazide( 1 ) was synthesized. Its sensing behavior toward various metal ions was investigated with fluorescence methods. Compound 1 displays different fluorescence emission responses to Al 3+ and Ca 2+ at the same excitation wavelength in the visible light region, while no changes occur after the addition of other metal ions. The binding ratios of the complexs of 1 -Al 3+ and 1 -Ca 2+ are both 2:1 according to the Job plot and high resolution mass spectrometer(HRMS) experiments. Moreover, emission spectrum of 1 -Ca 2+ complex and absorption spectrum of the rhodamine dyes overlap largely. When Al 3+ was added to the 1 -Ca 2+ system, calcium in complex 1 -Ca 2+ can be displaced by Al 3+ , resulting in the output of another ratiometric sensing signal, which demonstrates that the 1 -Ca 2+ complex can be served as a new and effective fluorescence resonance energy transfer(FRET) donor for rhodamine derivatives.
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Materials Research Letters
·
2014
·
IF 0
Q. Z. Tao,C. F. Hu,S. Lin,H. B. Zhang,F. Z. Li,D. Qu,M. L. Wu,Y. P. Sun,Y. Sakka,M. W. Barsoum
Herein we present evidence for the coexistence of a Mn-rich ferromagnetic (FM) state and a Mn-poor reentrant cluster glass state in bulk, polycrystalline, layered (Cr1−x,Mnx)2GeC samples, where x is varied between 0.01 and 0.1. The Mn-poor regions form a reentrant cluster glass state below ∼30 K. The Mn-rich regions become FM at Curie temperatures that increase with increasing Mn content. The interface coupling between these two regions gives rise to exchange anisotropy and a change in sign at 20 K resulting in, rarely observed, inverted hysteresis loops.
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Coatings
·
2017
·Vol. 7
·期 6
·78
·
IF 2.175
Shengzhong Jin,Shichao Zhao,Jiaxin Weng,Yanfei Lv
Molybdenum disulphide (MoS2) monolayer is a two-dimensional semiconductor material with potential applications in nano electronic devices. However, it is still a challenge to reproducibly synthesize single layer MoS2in high quality. Herein, we report the growth of monolayer of MoS2on the SiO2/Si substrate with manganese heterogeneous nucleation. It was shown that the Mn promotes the growth of monolayer MoS2via heterogeneous nucleation. The growth temperature range expanded two-fold, the nucleation density increased as well. The monolayer prepared in the presence of Mn exhibits a unique red emission peak at 732 nm at room temperature compared to the sample in the absence of Mn.Keywords:molybdenum disulphide;heterogeneous nucleation;growth;photoluminescence
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MATERIALS CHEMISTRY AND PHYSICS
·
2017
·
IF 2.084
Yiru Jia,Yi Pan,Haiying Wang,Rong Chen,Hua Wang,Xinjian Cheng
A fluorescent monomer of boron dipyrromethene (BODIPY) derivative ( 9AnPD) is designed and synthesized at first, and then it is introduced into polyurethane to obtain polymeric chemosensor with dangling fluorescent side groups. The monomer chemosensor 9AnPD exhibits highly selective properties to Hg 2+ ion in a wide pH range. The color of the monomer changed rapidly upon the addition of Hg 2+ ion. The fluorescence peak shifted and is enhanced about 4-flod. In addition, the monomer chemosensor reaches the detection limit of Hg 2+ is as low as 5 × 10 −6 m. When the fluorescent monomer is introduced to polymers, the sensing properties of the monomer chemosensor 9AnPD still remained. The polymer chemosensors not only exhibit fluorescence shift and color change for identifying Hg 2+ ion as its monomer chemosensor, but also improve the efficiency of detection. The detection limit of polymer chemosensor could reach 5 × 10 −7 m , and the fluorescence enhanced about 6-flod. The glass transition temperature (T g ) of the fluorescent PU is increased with the introduction of 9AnPD . However, it is about 60 °C, and will not lead to any adverse effect for the process. The molecular weights of PUs are lower than which without 9AnPD , but still of the macromolecular level.
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危险品化学品经营许可证（带存储）