JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 18
·14535-14544
·
IF 2.779
Liu Feng,Yao Zhiqian,Xu Suqiong,Fan Xiaohong,Zhang Xianke,Yuan Jujun,Yu Yi,Zhu Xiurong,Xiong Zuzhou,Yu Huajun
In this study, we develop a synergistic strategy combining defect engineering and porous structures to increase the photocatalytic activity of graphitic carbon nitride (g-C 3 N x ) under simulated sunlight. The photocatalytic efficiency of porous g-C 3 N x containing nitrogen defects for the degradation of Rhodamine B (RhB) is about 3.5 times higher than that of pristine g-C 3 N 4 synthesized by direct calcination, which can be attributed to its large specific surface area and surface nitrogen defects. Trapping experiments and electron spin resonance tests reveal that superoxide radical (·O 2 − ) is confirmed to be the predominant active specie for photodegrading RhB.
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高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2021
·Vol. 39
·期 12
·1538-1549
·
IF 3.603
Lin Sha,Sun Hui,Cornel Erik Jan,Jiang Jin-Hui,Zhu Yun-Qing,Fan Zhen,Du Jian-Zhong
Dented nanospheres show promising potential in drug delivery, nanomotors, etc . However, it is still challenging to prepare them by homopolymer self-assembly because of the strict structural requirements of the homopolymer. Herein, we propose a strategy for preparing dented nanospheres from homopolymers by co-assembly with a short peptide. They were co-assembled from poly(2-hydroxy-3-((4-(ethoxycarbonyl)phenyl)amino)propyl methacrylate) (PHBzoMA 59 ) and ( S )-2-(( S )-2-((((9 H -fluoren-9-yl)methoxy)carbonyl)amino)-3-phenylpropanamido)-3-phenylpropanoic acid (Fmoc-FF-OH). PHBzoMA homopolymers can only self-assemble into nanospheres without dent, and the addition of a short peptide introduced hydrogen bonding and complementary π-π stacking interactions led to the final dented nanosphere morphology. The weight fractions of the short peptide can be adjusted to regulate the final morphology. It was confirmed that the radius of curvature of the dent on the surface was related to the organic bubble inside the protospheres prepared at critical aggregation concentration (CAC). The organic bubble can be adjusted by altering the kind of organic solvent and solution pH, which allowed control over the dented nanosphere dimension. The use of different organic solvents with various polarities allows adjustment of the interfacial tension, and hence the denting degree. This degree can also be controlled by manipulating the solution pH to (de)protonate the short peptide and homopolymer. Furthermore, the versatility of this method was highlighted by using a different homopolymer and the applicability of the resulting dented nanospheres was demonstrated by decoration with gold nanoparticles. Overall, this study provided important insights and a new simple strategy to prepare dented nanospheres in a controlled fashion.
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高影响因子
Bioresources and Bioprocessing
·
2018
·Vol. 5
·期 1
·1-8
·
IF 0
Gao Zhen,Yi Yunfei,Zhao Jia,Xia Yongyang,Jiang Min,Cao Fei,Zhou Hua,Wei Ping,Jia Honghua,Yong Xiaoyu
Background Laccase, a multicopper oxidase that catalyzes the oxidation of phenols, aromatic amines, and benzenethiols, has attracted much attention in applications of organic synthesis, bioremediation, and pulp/textile bleaching. However, free laccases cannot be recycled and are easily inactivated in diverse environmental conditions. Enzyme immobilization is a promising strategy to improve stability, resistance to extreme conditions, and reusability of laccase. Results In this study, amino-functionalized magnetic Fe 3 O 4 nanoparticles were synthesized for co-immobilization of 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) and laccase by glutaraldehyde cross-linking method. The magnetic nanoparticles were characterized with FTIR, XRD and VSM. Cyclic voltammetry was carried out to verify electrochemical behaviors of the co-immobilized laccase and TEMPO nanoparticles. When the co-immobilized laccase and TEMPO nanoparticles were used to decolorize acid fuchsin, the maximum decolorization rate of 77.41% was obtained with the ratio of TEMPO to laccase being 0.3 mM/g:120 U/g. Conclusion The co-immobilized nanoparticles retained above 50% residual activity after eight cycles of operation, which presented an approach to develop a co-immobilized laccase and mediator system for potential industrial application.
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IONICS
·
2019
·Vol. 25
·期 7
·3143-3152
·
IF 2.289
Li Jie,Lei Xiaoke,Qin Furong,Zong Chuanxin,Liu Lele,Zhang Kai
MoSe 2 nanosheets embedded in a mesoporous carbon matrix is synthesized through a facile route, where molybdenum source is recrystallized forming nanocrystals and further react with selenium. To obtain fine nanocrystals, freeze-drying technique is used to creating a large subcooled temperature. With low MoSe 2 content of ~ 54 wt%, the mesoporous MoSe 2 /C composite shows an initial capacity of 450 mA h g −1 and a reversible capacity of 276 mA h g −1 after 200 cycles.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 38
·57823-57834
·
IF 5.19
Yi Shuang,Bao Binqin,Song Weifeng,Liu MuDdan
In this study, L-methionine and nano-Fe 3 O 4 were encapsulated and cured on sodium alginate by the ionic cross-linking method to form magnetic composite gel spheres (SML) as an adsorbent for the removal of Zn(II) from water. The influence of adsorbent dosages, pH, reaction time, and initial ion concentration on the ability of the gel spheres to adsorb Zn(II) was investigated, and the adsorption mechanism was identified. The experimental results showed that under the optimum conditions (pH = 5, t = 60 min, dosage of SML is 0.7 g·L −1 ), the maximum amount of Zn(II) adsorbed by the adsorbent gel spheres reached 86.84 mgˑg −1 . The reaction process of this adsorbent fits well with the Langmuir and pseudo-second-order kinetic models and is a heat absorption reaction. The adsorbent would preferentially adsorb Pb(II), and the adsorption efficiency of Zn(II) decreased when the concentration of interfering ions increased in the coexistence system. Further mechanistic research showed that this magnetic composite adsorbent is a mesoporous material with superior adsorption performance, and the amino and carboxyl groups on it react with Zn(II) via ligand chelation; the ion exchange effect of Ca(II) also plays a role. The adsorption amount of Zn(II) was maintained at a higher level after 5 cycles, and the loss of Fe was approximately 0.2%. In summary, SML, which is environmentally friendly, efficient, and recyclable, is an ideal adsorbent for Zn(II) removal.
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PubMed
高影响因子
JOURNAL OF SOLUTION CHEMISTRY
·
2022
·Vol. 51
·期 12
·1508-1521
·
IF 2
Wei Mengru,Wu Yuxing,Li Tiancheng,Zhang Ping,Liu Xuejun,Zhai Cuiping,Chen Xin
Cyclic voltammetry (CV), 1 H nuclear magnetic resonance ( 1 H NMR), density functional theory (DFT), quantum theory of atoms in molecules (QTAIM) and reduced density gradient (RDG) were used to study the interactions of dopamine hydrochloride (DH) with nicotinic acid (NAC) in aqueous solution. The results revealed that there existed three weak interactions in the DH–NAC system, C–H···π, π···π stacking and hydrogen bonds. These interactions showed different effects on the DH electrooxidation and its chemical environment. Moreover, the CV and 1 H NMR results indicated that C–H···π interaction between the H atoms on the benzene ring of DH and the pyridine ring of NAC, and π···π stacking between the benzene ring of DH and the pyridine ring of NAC are the main interactions in the system.
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高影响因子
CELLULOSE
·
2018
·Vol. 25
·期 10
·5511-5522
·
IF 3.809
Li Xingkang,Luo Yifan,Daroch Maurycy,Hou Juan,Gui Weiyang
Hemicellulose and lignin act as physical barriers impeding the hydrolysis of lignocellulosic biomass by cellulases. To develop a process which could simultaneously remove most hemicellulose and lignin in biomass, in this study, oxygen-assisted ethanol organosolv pretreatment (O 2 -EOP) of sugarcane bagasse (SCB) was carried out. The effects of temperature, time, oxygen pressure and ethanol concentration on the pH of the hydrolysate, the solubilization and the chemical composition of SCB were investigated. Compared with autocatalytic EOP and acid-catalyzed EOP, O 2 -EOP could remove most xylan and lignin from SCB at much milder conditions. At optimized conditions (40/60 ethanol/water (v/v), 1.5 MPa O 2 , 160 °C and 80 min), 82.9% xylan and 83.3% lignin were removed. Glucan content in the residue reached 86.3%, much higher than results obtained by autocatalytic EOP and acid-catalyzed EOP. In subsequent enzymatic hydrolysis (1% solid loading, 4.96 mg protein/g cellulose, 72 h), O 2 -EOP pretreated SCB produced 3.97 and 1.90 times more glucose than untreated material and N 2 -EOP pretreated SCB, respectively. O 2 -EOP also produced abundant organic acids, total amounts of formic acid and acetic acid in the hemicellulose hydrolysate reached 5.42 g/L. In conclusion, O 2 -assisted EOP was an effective process for the production of pulp with high cellulose purity and good accessibility to cellulases.
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高影响因子
JOURNAL OF POLYMER RESEARCH
·
2013
·Vol. 20
·期 8
·1-6
·
IF 2.019
Li Chunfang,Li Dongxiang,Qiu Chuanlong,Hou Wanguo
Amphiphilic dendritic macromolecules are suitable for the noncovalent encapsulation of guest molecules and could potentially be applied in drug-delivery systems. In this work, amphiphilic carbosilane dendrimers with peripheral poly(ethylene glycol) (PEG) units were synthesized using a hydrosilylation reaction, and their encapsulation properties were studied by fluorescence spectroscopy, using pyrene as the probe molecule. The results showed that the encapsulating capacity of the dendrimers increased as the number of PEG units increased, and that it also depended to some degree on the dendrimer generation.
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高影响因子
Frontiers of Materials Science
·
2016
·Vol. 10
·期 2
·113-121
·
IF 1.354
Wei Qilin,Xu Feiyang,Xu Xingjian,Geng Xue,Ye Lin,Zhang Aiying,Feng Zengguo
The non-woven wound dressing with core–shell structured fibers was prepared by coaxial electrospinning. The polycaprolactone (PCL) was electrospun as the fiber’s core to provide mechanical strength whereas collagen was fabricated into the shell in order to utilize its good biocompatibility. Simultaneously, the silver nanoparticles (Ag-NPs) as anti-bacterial agent were loaded in the shell whereas the vitamin A palmitate (VA) as healing-promoting drug was encapsulated in the core. Resulting from the fiber’s core–shell structure, the VA released from the core and Ag-NPs present in the shell can endow the dressing both heal-promoting and anti-bacteria ability simultaneously, which can greatly enhance the dressing’s clinical therapeutic effect. The dressing can maintain high swelling ratio of 190% for 3 d indicating its potential application as wet dressing. Furthermore, the dressing’s anti-bacteria ability against Staphylococcus aureus was proved by in vitro anti-bacteria test. The in vitro drug release test showed the sustainable release of VA within 72 h, while the cell attachment showed L929 cells can well attach on the dressing indicating its good biocompatibility. In conclusion, the fabricated nanofibrous dressing possesses multiple functions to benefit wound healing and shows promising potential for clinical application.
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高影响因子
International Journal of Environmental Science and Technology
·
2018
·Vol. 16
·期 10
·5669-5684
·
IF 2.037
Zhou H.,Chen X.,Ying T.,Xuan Y.,Wangjin Y.,Liu X.
Thirteen wastewater-marking pharmaceuticals were selected to explore their variations and behavior under hydrodynamic conditions in urban river systems. Four flow velocities were set, i.e., 0 cm/s for static condition, and 5, 10 and 20 cm/s for dynamic conditions. In the water phase, most of target compounds emerged big fluctuations between static and dynamic conditions. The lower concentrations were detected in the dynamic conditions. However, carbamazepine had minimum relative change during the whole 15-day tests with at least 85% of the initial concentration remaining. In the sediment, the concentrations of most pharmaceuticals in the dynamic conditions were higher than in the static condition, whereas carbamazepine showed big fluctuation in both static and dynamic conditions. With the change of the flow velocities, all target pharmaceuticals showed obviously different variation tendencies mainly due to the changes of environmental parameters, such as turbidity, dissolved matters, microbial biomass, and suspended particulates. In addition, five metabolites were selected to further investigate the transformation of diclofenac and carbamazepine with different flow velocities in the water phase. More diclofenac were transformed into 4-Hydroxy diclofenac in the water phase in the dynamic conditions. Moreover, in the case of a set flow velocity, the concentrations of some pharmaceuticals changed remarkably between the straight and turning channels of an urban river system. Overall, hydrodynamic conditions showed significant influences on the levels of target compounds in the aquatic environment and, therefore, could be taken into account in the risk assessment and control of these compounds.
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高影响因子
MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 12
·1-8
·
IF 5.705
Lin Haizhu,Chen Hemei,Shao Xi,Deng Chunhui
A zirconium(IV)-based metal organic framework (Zr-MOF) was deposited on polydopamine-coated silica microspheres to form microspheres of type SiO 2 @PDA@Zr-MOF. These were packed into capillary columns for enrichment of phosphopeptides. The column was off-line coupled to both matrix-assisted laser desorption/ionization time of flight mass spectrometry and LC-ESI-MS/MS. The method has a detection limit as low as 4 fmol of β-casein digest and a selectivity as high as 1:1000 (molar ratio of β-casein and BSA digest). It was applied to the analysis of human saliva. In total, 240 endogenous phosphopeptides were identified in only 25 μL human saliva.
A zirconium-based metal organic framework (Zr-MOF) was modified outside of polydopamine-coated silica microspheres to form microspheres named SiO 2 @PDA@Zr-MOF. Then they were packed in capillary columns for selective enrichment of phosphopeptides via interaction between Zr-O clusters and phosphate groups. The pre-concentration resulted in a better detection of phosphopeptides by mass spectrometry. Tris: Tris(hydroxymethyl)aminomethane; DMF: Dimethyl Formamide; Zr-MOF: Zirconium(IV)-organic framework; MOAC: Metal oxide affinity chromatography.
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PubMed
高影响因子
JOURNAL OF APPLIED ELECTROCHEMISTRY
·
2018
·Vol. 48
·期 10
·1163-1173
·
IF 2.262
Luo Fan,Liu Mingrui,Chi Bin,Dang Dai,Hou Sanying,Liao Shijun,Li Xiuhua,Song Huiyu
Abstract Through decorating commercial Pt/C catalyst with a binary oxide of silicon and tin, a catalyst with significantly enhanced self-humidification capacity and ultra-high stability has been successfully prepared. After 5000 cycles, ECSA and ORR activity decay by only 30% and 28.4%, respectively, for our optimal decorated catalyst, compared with 75% and 99.9% for undecorated Pt/C under the same conditions. We attribute this improvement to the prevention of Pt nanoparticle aggregation and the synergistic effects between the Pt active component and the binary oxide. The decorated catalyst also exhibits excellent self-humidification. Under non-humidified operating conditions, a membrane electrode assembly (MEA) with a decorated Pt/C catalyst anode is discharged at 0.6 V for 8 h with only slight current density decay, whereas serious decay is observed for an MEA with a non-decorated Pt/C anode. The catalysts are characterized using XRD, SEM/TEM, XPS, and contacted angle measurement. We find that the dissolution, migration, and aggregation of Pt nanoparticles can be effectively prevented by decoration with the binary oxide, and that the contact angle is decreased by 56°, indicating great improvement in the catalyst’s wettability. The interactions between Pt and oxide, Sn and Si are revealed by XPS analysis. This work may provide a facile and effective way to address the durability and humidification issues of PEM fuel cells. Graphical Abstract An oxide modified Pt/C catalyst was prepared by decorating the commercial Tanaka Pt/C catalyst with a binary oxide of Sn and Si, the catalyst exhibited significantly enhanced stability/durability, slightly enhanced activity and excellent self-humidification property. The catalysts were characterized with HRTEM, XPS etc. The enhancements should be attributed to the prevention of the coated binary oxide to the aggregation of Pt, the corrosion of carbon support. And self-humidification may be resulted from the wettability of the silicon oxide.
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高影响因子
危险品化学品经营许可证（带存储）