Scientific Reports
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2017
·Vol. 7
·期 1
·1-9
·
IF 4.259
Chen Yipeng,Wang Hanwei,Dang Baokang,Xiong Ye,Yao Qiufang,Wang Chao,Sun Qingfeng,Jin Chunde
Nacre, the gold standard for biomimicry, provides an excellent example and guideline for assembling high-performance composites. Inspired by the layered structure and extraordinary strength and toughness of natural nacre, nacre-like nanolignocellulose/poly (vinyl alcohol)/TiO 2 composites possessed the similar layered structure of natural nacre were constructed through hot-pressing process. Poly (vinyl alcohol) and TiO 2 nanoparticles have been used as nanofillers to improve the mechanical performance and synchronously endow the superior photocatalytic activity of the composites. This research would be provided a promising candidate for the photooxidation of volatile organic compounds also combined with outstanding mechanical property.
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PubMed
高影响因子
Microbial Cell Factories
·
2017
·Vol. 16
·期 1
·1-10
·
IF 3.681
Zhang Hui,Li Mengya,Li Jie,Wang Guangli,Liu Yuan
Quizalofop- p -ethyl (QPE) is a post-emergence herbicide that effectively controls grass weeds and is often detected in the environment. However, the biochemical and molecular mechanisms of QPE degradation in the environment remains unclear. In this study, a highly effective QPE-degrading bacterial strain J-2 was isolated from acclimated activated sludge and identified as a Pseudomonas sp., containing the QPE breakdown metabolite quizalofop acid (QA) identified by Liquid Chromatography-Ion Trap-Mass Spectrometry (LC-IT-MS n ) analysis. A novel QPE hydrolase esterase-encoding gene qpeH was cloned from strain J-2 and functionally expressed in Escherichia coli BL21 (DE3). The specific activity of recombinant QpeH was 198.9 ± 2.7 U mg −1 for QPE with K
m
and K
cat
values of 41.3 ± 3.6 μM and 127.3 ± 4.5 s −1 . The optimal pH and temperature for the recombinant QpeH were 8.0 and 30 °C, respectively and the enzyme was activated by Ca 2+ , Cd 2+ , Li + , Fe 3+ and Co 2+ and inhibited by Ni 2+ , Fe 2+ , Ag + , DEPC, SDS, Tween 80, Triton X, β-mercaptoethanol, PMSF, and pCMB. In addition, the catalytic efficiency of QpeH toward different AOPP herbicides in descending order was as follows: fenoxaprop-P-ethyl > quizalofop-P-tefuryl > QPE > haloxyfop-P-methyl > cyhalofopbutyl > clodinafop-propargyl. On the basis of the phylogenetic analysis and multiple sequence alignment, the identified enzyme QpeH, was clustered with esterase family V, suggesting a new member of this family because of its low similarity of amino acid sequence with esterases reported previously.
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CELLULOSE
·
2017
·Vol. 24
·期 7
·2861-2875
·
IF 3.417
Huang Biao,Liu Mingxian,Zhou Changren
Halloysite nanotubes (HNTs) were added to cellulose NaOH/urea solution to prepare composite hydrogels using epichlorhydrine crosslinking at an elevated temperature. The shear viscosity, mechanical properties, microstructure, swelling properties, cytocompatibility, and drug delivery behavior of the cellulose/HNT composite hydrogels were investigated. The viscosity of the composite solution increases with the addition of HNT. The compressive mechanical properties of composite hydrogels are significantly improved compared with pure cellulose hydrogel. The compressive strength of the composite hydrogels with 66.7% HNTs is 128 kPa, while that of pure cellulose hydrogel is only 29.8 kPa in compressive strength. Rheological measurement suggests the resistance to deformation is improved for composite hydrogels. X-ray diffraction and Fourier transform infrared spectroscopy show that the crystal structure and chemical structure of HNT are not changed in the composite hydrogels. Hydrogen bonding interactions between HNT and cellulose exist in the composites. A porous structure of the composite hydrogels with pore size of 200–400 μm was found by scanning electron microscopy. The addition of HNT leads to decreased swelling ratios in NaCl solution and pure water for the composite hydrogels. Cytotoxicity assays show that the cellulose/HNT composite hydrogels have a good biocompatibility with MC3T3-E1 cells and MCF-7 cells. Curcumin is further loaded into the composite hydrogel via physical adsorption. The curcumin-loaded composite hydrogels show a strong inhibition effect on the cancer cells. All the results illustrate that the cellulose/HNT composite hydrogels have promising applications such as anticancer drug delivery systems and anti-inflammatory wound dressings.
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JOURNAL OF MATERIALS SCIENCE
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2017
·Vol. 52
·期 17
·10567-10580
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IF 2.599
Tong Zaizai,Zhuo Wangqian,Zhou Jie,Huang Runsheng,Jiang Guohua
Noncovalent functionalization was used to modify the graphene nanosheets via π – π stacking of pyrene-terminated molecule (Py-LC), resulting in an intercalated layer structure incorporated with about 45 wt% of Py-LC. The organically modified graphene (Py-LC-rGO) has a better dispersion in the PET matrix compared with that without modification. Consequently, it remarkably accelerates the crystallization of PET. Moreover, the nucleation ability of Py-LC-rGO is even stronger than that of commercial nucleation agent, sodium benzoate, leading to a thicker lamellar crystals and denser stacking of lamellae. Accordingly, the impact toughness of such a composite is improved to be nine times as that of neat PET, which can be a promising candidate as nanofiller for PET.
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WATER AIR AND SOIL POLLUTION
·
2017
·Vol. 228
·期 11
·1-10
·
IF 1.702
Laipan Minwang,Fu Haoyang,Zhu Runliang,Rivera Linda,Zhu Gangqiang,Zhu Jianxi,He Hongping
Hexavalent chromium (Cr(VI)) and dyes are of particular environmental concern and need to be removed from water urgently due to their high toxicity. Herein, we explored the possibility of electron transferring from dye Orange II (OII) to Cr(VI) under UV and simulated solar light irradiation, expecting to simultaneously decolorize dyes and reduce Cr(VI). Experimental results show that light irradiation can partially decolorize OII but has no ability to reduce Cr(VI) in solution only with OII or Cr(VI). However, both dyes and Cr(VI) can effectively and simultaneously be decolorized and reduced in the solution containing both OII and Cr(VI) under light irradiation, and a low pH level and high OII/Cr(VI) concentration ratio significantly favor the co-removal. Additionally, insoluble organo–Cr(III) complexes identified by FTIR and XPS characterization were generated during the reaction. These complexes are beneficial to the removal of chromium and total organic carbon from water. The possible degradation pathway of OII is further proposed based on the detection of degraded products by GC-MS analysis. The results of this work offer an approach for simultaneously removing multiple contaminants.
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CATALYSIS LETTERS
·
2017
·Vol. 147
·期 7
·1631-1639
·
IF 2.799
Zhang Zhengwei,Xiao An,Yan Kun,Liu Yanhua,Yan Zhengyu,Chen Jianqiu
Abstract Herein, the CuInS 2 /ZnS/TGA quantum dots (QDs) were prepared by the oil phase reaction containing thioglycolic acid (TGA) as a functional modification agent under a nitrogen atmosphere. The CuInS 2 /ZnS/TGA QDs using as the photocatalysts exhibited high photocatalytic activity for the degradation of Rhodamine B (RhB) under ultraviolet irradiation. The photocatalytic conditions were optimized to degrade RhB with superior performances, including the initial RhB and CuInS 2 /ZnS/TGA QDs concentrations, solution pH values and ultraviolet light intensities. Furthermore, the kinetic equations of photocatalytic reaction and possible photocatalytic degradation mechanism were investigated. The results indicated that it belongs to the typical first order kinetic in accordance with the Langmuir–Hinshelwood mechanism, and the electrons and holes on the surface of the CuInS 2 /ZnS/TGA microspheres are the main acting forces during the RhB photocatalytic degradation. Graphical Abstract
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MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 8
·2981-2990
·
IF 4.58
Wang Ting,Liu Siyu,Gao Guihua,Zhao Pan,Lu Nan,Lun Xiaowen,Hou Xiaohong
The authors describe a method for magnetic solid phase extraction (MSPE) combined with ultra-high performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) for the quantitation of eight non-steroidal anti-inflammatory drugs (NSAIDs) in wastewater and environmental water samples. Specifically, the NSAIDs were directly extracted by using a magnetic nanocomposite of type Fe 3 O 4 /MIL-101(Cr) (Matérial Institute Lavoisier, MIL) from 50 mL water samples without any further cleanup. The effects of the amount of adsorbent, pH value, salt concentration, ultrasonic extraction time, desorption solvent nature and volume and desorption time were investigated. Under the optimal conditions, UPLC-MS/MS based detection resulted in the following figures of merit: (a) Linear calibration plots that typically extend from 0.1 (0.2, 0.05, 0.02) to 50 μg·L −1 , depending on the compound; (b) detection limits between 3 to 60 ng·L −1 ; and (c), recoveries varying from 81.2% to 116.8% with relative standard deviations between 0.4% and 10.8%. The adsorption of NSAIDs on Fe 3 O 4 /MIL-101(Cr) was characterized by adsorption isotherms, kinetics and thermodynamics studies and provides a deeper insight into the adsorption mechanism. Compared to other method for pretreatment and preconcentration of NSAIDs, the new method is more rapid, sensitive, accurate and eco-friendly. The method was successfully applied to the determination of the NSAID residues in a variety of real environmental and wastewater samples.
Schematic of a method for determination of non-steroidal anti-inflammatory drugs (NSAIDs) in environmental water by magnetic solid phase extraction based on Fe 3 O 4 /MIL-101(Cr) combined with UPLC-MS/MS. The adsorption mechanism of NSAIDs on Fe 3 O 4 /MIL-101(Cr) was studied.
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IRANIAN POLYMER JOURNAL
·
2017
·Vol. 26
·期 3
·205-211
·
IF 1.422
Zhou Min-Jie,He Fang,Wu Hu,Wang Guo-Xiang,Liu Li-Chao,Xu Wenyuan
Fe-mediated photo-induced atom transfer radical polymerization (ATRP) of methyl methacrylate was studied with chlorophyll A as photoredox catalyst in the absence of ligands. This is the first report on photo-induced and FeBr 3 -mediated ATRP. A low-cost and environmentally friendly ATRP is provided in this system. A good linear semi-logarithmic plot of polymerization kinetics is the first-order time conversion, and narrow molecular weight distributions explain the well-controlled behavior. The measured number average molecular weight, M
n,GPC (determined by gel permeation chromatography), is increased with monomer conversion, and it is in good agreement with the theoretical values ( M
n,th ). The effect of FeBr 3 is studied with respect to the polymerization. The values of the resultant PMMA increased with reduced FeBr 3 concentration. In this system, the effect of periodic light/off process has been investigated through chain growth instantly turned on and off in response to the visible light. The polymerization was controllable even though the concentration of Fe-based catalyst was dropped to 4 ppm. The chain-end group having a functionality in the synthesized poly(methyl methacrylate) was characterized by nuclear magnetic resonance spectrometry ( 1 H NMR). However, chain extension experiments show reserved chain-end functionality in the synthesized polymers and further confirm the “living” feature of the Fe-mediated photo-induced atom transfer radical polymerization.
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CELLULOSE
·
2024
·Vol. 31
·期 14
·8681-8693
·
IF 4.9
Yi Zhaodi,Song Zengbin,Wang Jian,He Ming
Hydrogel smart windows with light modulation capability have received widespread attention because they can meet the requirements of indoor lighting at daytime, privacy protection at night and energy saving. However, it remains challenging to achieve these multiple goals simultaneously and enable active actuation to meet the temporary needs of users. In this study, a thermal and solvent responsive hydrogel smart window was developed by introducing hydroxypropyl cellulose (HPC) and sodium dodecyl sulfate (SDS) micelles into a polyacrylamide (PAAm) cross-linked network. By adding different concentrations of NaCl solution, the hydrogels underwent upper critical solution temperature (UCST)- and lower critical solution temperature (LCST)-type phase transitions in the ranges of 1 − 15 °C and 25 − 80 °C, respectively, which enabled the hydrogel to achieve a reversible transition between opacity and transparency with temperature change. The smart window exhibited an excellent solar modulation ability (T lum = 91.39%, ΔT sol , 15−5℃ = 68.67%, ΔT sol , 15−40℃ = 62.50%) and effective IR shielding. Furthermore, actively actuated light modulation of hydrogel smart windows was achieved by spraying ethanol on the hydrogel surface. Ethanol stimulation and volatilization induced the reconfiguration and dissociation of hydrogen bonds between HPC and PAAm molecular chains, resulting in reversible transparency transitions. We anticipate that this facile strategy for preparing thermal and solvent responsive hydrogels could serve as a promising alternative for designing phase change hydrogels for a variety of applications. Graphical Abstract
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2024
·Vol. 50
·期 7
·3033-3052
·
IF 2.8
Huang Guihua,Yang Zizhen,Li Sijia,Wang Zhengwei,Xu Jundong,Zheng Shuqin
In-situ crystallization was used to prepare the composite molecular sieve ZSM-5/MOR (Z/M) successfully, and FeLa-ZSM-5/MOR (FeLa-Z/M) was obtained by loading Fe and La on the surface of the composite molecular sieve by hydrothermal method. The composite molecular sieve combined the water absorption of mordenite (MOR) and the mass transfer performance of ZSM-5, and effectively improved the surface area and porous structure. This zeolite improved the dispersion performance of active sites in Z/M and reduced mutual aggregation between particles, which was conducive to catalytic efficiency. The addition of La increases the number of oxygen vacancies, according to XRD, TEM, XPS, UV-DRS, and other data analyses. Because doping of La stretched the Fe–O bond, reduced the oxygen vacancies’ formation energy, and promoted oxygen vacancies’ formation, which was an essential reason for Fe 3+ reduction and Fe 3 O 4 formation. The addition of La also had a highly dispersed effect on Fe. Under the optimal conditions, with a FeLa mass ratio of 1:1, FeLa-Z/M at 25 mg, H 2 O 2 at 0.5 ml, and a pH of 3, the degradation rate of IC was found to be 97.8% and 99.5% in 5 min and 10 min respectively. Analysis of the reaction indicated that the catalyst followed a first-order reaction kinetic. Free radical quenching experiments confirmed that the main free radicals in the FeLa-Z/M Fenton-like system were hydroxyl radicals (·OH), suggesting a possible catalytic mechanism. Furthermore, the synthesized FeLa-Z/M catalyst exhibited superior performance compared to other methods of IC removal, demonstrating high reusability and efficient degradation even after multiple uses. Graphical abstract
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BMC Oral Health
·
2024
·Vol. 24
·期 1
·1-13
·
IF 2.6
Tao Lu,Gao Ying,Li Yushen,Yang Liuqing,Yao Jingjing,Huang Handan,Yu Jinling,Han Bing,Wang Bowei,Liu Zhihui
Background Medication-related osteonecrosis of the Jaw (MRONJ) is a rare but severe side effect in patients treated with medications such as Bisphosphonates (BPs). Its pathophysiological mechanism needs to be more precise. Establishing preventive measures and treatment standards is necessary. This study aimed to develop a composite hydrogel scaffold constituted by methacrylated gelatin (GelMA), methacrylated heparin (HepMA) and PRF, and investigate its potential application value in the prevention of MRONJ.Methods GelMA, HepMA, and PRF were prepared using specific ratios for hydrogel scaffolds. Through mechanical properties and biocompatibility analysis, the release rate of growth factors and the ability to promote bone differentiation in vitro were evaluated. To explore the healing-enhancing effects of hydrogels in vivo, the composite hydrogel scaffold was implanted to the MRONJ rat model. Micro-computed tomography (Micro-CT) and histological examination were conducted to evaluate the bone morphology and tissue regeneration.Results The Hep/GelMA-PRF hydrogel improved the degradation rate and swelling rate. It was also used to control the release rate of growth factors effectively. In vitro, the Hep/GelMA-PRF hydrogel was biocompatible and capable of reversing the inhibitory effect of zoledronic acid (ZOL) on the osteogenic differentiation of MC3T3-E1s. In vivo, the micro-CT analysis and histological evaluation demonstrated that the Hep/GelMA-PRF group exhibited the best tissue reconstruction. Moreover, compared to the ZOL group, the expression of osteogenesis proteins, including osteocalcin (OCN), type collagen I (Col I), and bone morphogenetic protein-2 (BMP-2) in the Hep/GelMA-PRF group were all significantly upregulated (P < 0.05).Conclusion sThe Hep/GelMA-PRF hydrogel scaffold could effectively control the release rate of growth factors, induce osteogenic differentiation, reduce inflammation, and keep a stable microenvironment for tissue repair. It has potential application value in the prevention of MRONJ.
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CHINESE JOURNAL OF POLYMER SCIENCE
·
2025
·
IF 4
Fan Wen-Jie,Xie Meng,Tian Jin-Feng,He Yan,Xia Shuang,Fu Wen-Xin
Low dielectric constant (low- k ) materials are critical for advanced packaging in high-density microelectronic devices and high-frequency communication technologies. Ladder polysiloxanes, which are characterized by their unique double-chain structure and intrinsic microporosity, offer remarkable advantages in terms of thermal stability, oxidation resistance, and dielectric performance. However, structural defects in ladder polysiloxanes, such as cage-like and irregular oligomers, and their effects on dielectric properties remain underexplored. In this study, a series of ladder-like polysiloxanes ( X-TMS ) with diverse side groups weresynthesized via a one-step base-catalyzed method. The influence of the benzocyclobutene (BCB) side groups on the formation of regular ladder structures was systematically investigated. Notably, BCB incorporation disrupted the structural regularity, favoring the formation of cage-like and irregular topologies, which were extensively characterized using 29 silicon nuclear magnetic resonance spectroscopy ( 29 Si-NMR), Fourier transform infrared spectroscopy (FTIR), gel permeation chromatography (GPC), and X-ray diffraction (XRD). These structural defects were beneficial for improving the hydrophobicity and thermal stability. Copolymerization of X-TMS with commercial DVS-BCB resins further enhanced the mechanical properties, with the elastic modulus increasing from 3.6 GPa to 4.4 GPa and water absorption reduced from 0.33 wt% to 0.06 wt%. This study establishes a clear correlation between topological structures and material properties. These findings not only advance the understanding of the structure-property relationships in ladder polysiloxanes but also provide a novel approach for designing high-performance interlayer dielectric materials for next-generation microelectronics.
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危险品化学品经营许可证（带存储）