NEW JOURNAL OF CHEMISTRY
·
2017
·Vol. 41
·期 22
·13327-13335
·
IF 3.269
Ce Gao,Qing-Da An,Zuoyi Xiao,Shangru Zhai,Bin Zhai,Zhan Shi
Nanosilver/alginate composite beads were successfully fabricated via a simple one-pot encapsulation method and were effectively applied to degradation experiments with p-nitrophenol under batch and fixed-bed conditions. Three-dimensional alginate hydrogels cross-linked with calcium ions were used as supporting matrix for “confinement” of the nanosilver, leading to the formation of nanosilver/alginate composite beads without significant aggregation of active nanoparticles. The samples were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. As-fabricated bead-like samples showed excellent catalytic efficiency at ambient temperature; material with 10% silver content required 170 seconds to catalyze hydrogenation of highly toxic p-nitrophenol under batch conditions. Good stability was also demonstrated in the process of dynamic catalytic degradation, which showed continuous high conversion performance for 4-NP; about 40 minutes at 298 K and residual concentration reached 0.0335 mg L−1 at a flow rate of 1 mL min−1. A pseudo-first order kinetic model described the relationship between concentration and time well; the rate constant k is 0.0149 s−1. Very favorably, the way to recycle the catalyst is very simple, namely filtration only is enough. In addition, the catalytic capability did not decline significantly after 10 recycles and average conversion content was still 97.96%.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 52
·期 14
·8391-8400
·
IF 2.599
Zeng Xiaoping,Wang Qin,Wang Hong,Yang Yajiang
Halloysites are a kind of aluminosilicate clay with a morphology of a nanotube. The inner wall of halloysite is positively charged, and the external surface is negatively charged. In this work, we propose a simple and facile method to prepare Ag NPs loaded in the lumen of halloysite nanotubes (HNTs). Herein, N -acetyl- l -cysteine modified silver nanoparticles (Ag NPs) with negative charges spontaneously and stably resided in the lumen of HNTs via electrostatic interactions. The images of transmission electron microscopy and scanning transmission electron microscopy showed that Ag NPs with a size of ~2.6 nm were uniformly distributed in the lumen of HNTs. The catalytic activity of the obtained Ag NPs/HNTs composites was evaluated by the reduction reaction of 4-nitrophenol (4-NP) as a model reaction. When the molar ratio of Ag and 4-NP was set at 0.008, the rate constant of the reaction was found to be 0.91 min −1 , two times higher than that of Ag NPs adsorbed on the external surface of HNTs. Additionally, no Ag NPs were found in the supernatant after the Ag NPs/HNTs suspension was stirred for 30 min. Such structural stability implies good reusability as a catalyst.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2012
·
IF 2.236
Xiuying Qiao,Jun Zhou,Bernard P. Binks,Xinglong Gong,Kang Sun
Silane-modified Fe 3 O 4 nanoparticles can stabilize emulsions of both polar and non-polar oils, and the rheological behavior of these emulsions has been investigated as a function of oil volume fraction ( ϕ o ), oil polarity and magnetic field intensity ( ψ ). All the emulsions show a similar elastic response with a modulus plateau at low frequency and a small phase angle (<15°) in dynamic oscillatory shear, and shear-thinning behavior in steady shear measurements. This is independent of ϕ o , oil polarity and ψ . The dynamic modulus ( G ′) and complex viscosity ( η *) increase with an increase in ϕ o and oil polarity, due to enhanced droplet packing and flocculation and particle aggregation on droplet surfaces. The presence of a magnetic field promotes particle attractions and associations and enhances the strength of the three-dimensional particle and droplet networks, thus remarkably increasing G ′ and η * and raising the yield stress. The increase in modulus, viscosity and yield stress are beneficial for the elevation of the stability of these functional emulsions.
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高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Fangru He,Hejun Ren,Tingting Li,Shuai Liu,Rui Zhou
This work demonstrated a novel N , N -bis(carboxymethyl)glutamic acid (GLDA) modified visible (vis) light assisted Fenton–like system which could effectively removal ciprofloxacin (CIP) at neutral pH. The removal rate of CIP in the GLDA/Fe(III)/H 2 O 2 /vis system was 97.9% within 120 min and was approximately twice as high as that in the Fe(III)/H 2 O 2 /vis system. GLDA could significantly accelerate the Fe(III)/Fe(II) cycle under visible light irradiation. Radical scavenging experiments demonstrated that 74.2% of the Fe(II) in the GLDA/Fe(III)/H 2 O 2 /vis system originated from the ligand–to–metal charge transfer reaction between Fe(III) and GLDA. The hydroxyl radical was the dominant species for CIP degradation. H 2 O 2 utilization kinetic modeling exhibited that 90.1% of H 2 O 2 was used for CIP mineralization. The effects of experimental parameters and coexisting substances on the removal of CIP in the Fe(III)/GLDA/H 2 O 2 /vis system were investigated in detail. The intermediate products of CIP were explored via the high–performance liquid chromatography-mass spectrometry.
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高影响因子
DALTON TRANSACTIONS
·
2012
·Vol. 41
·期 36
·11125-11133
·
IF 3.838
Jia Zhao,Zhenhong Wei,Xianghua Zeng,Xiaoming Liu
Three diiron complexes (1-Ph, 2-OH, and 3-OCOFc) as mimics of the diiron subunit of [FeFe]-hydrogenase were electrochemically investigated in 0.1 mol L−1 [NBut4]BF4–acetonitrile (MeCN) under CO and Ar atmosphere. Complex 3-OCOFc was prepared from the reaction of complex 2-OH with ferrocenylacyl chloride (FcOCCl). The complex was fully characterised using a variety of spectroscopic techniques. Its structure was established using X-ray single crystal diffraction analysis. In addition to the well-established ECE (E for electrochemical and C for chemical) mechanism, it was revealed that a further reversible reduction at a potential more negative by ca. 600 mV was observed under CO atmosphere. It was further proposed based on the analysis of electrochemical and infrared spectroscopic data that the second redox was due to a two-electron process of supposedly a tetrairon cluster. This product was formed in situ from the reaction between the dianion generated from the ECE process and its parent complex (1-Ph, 2-OH, and 3-OCOFc) and is supposedly of a core “Fe4(II)”. This reaction occurred only when CO was presented. Under Ar atmosphere, bulk electrolysis led to fully-reduced products, that is, with the iron at the oxidation state of zero, but complex 2-OH was an exception. An overall mechanism to describe the electron transfer and coupled chemical reactions under CO atmosphere was proposed.
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高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 14
·4869-4875
·
IF 7.059
Qi-Yu Liu,Yao Zhong,Zheng-Zhi Jiang,Kai Chen,Song Ma,Peng-Fei Wang,Wei Wang,Li Zhou,Meng-Dai Luoshan,Qu-Quan Wang
Metallic nanostars have tunable plasmon resonances and high photocatalytic activities; however, controlling the number and length uniformity of branches for the colloidal nanostars is still a challenge. Herein, we report a successful growth of triangular nanostars of an AuCu alloy by tuning the atomic ratio of Cu (γCu = 0.36). The growth kinetics is dominated by the γCu, and the evolution from triangular to pentacle nanostars is observed. The triangle AuCu nanostars have a uniform branch length and therefore exhibit strong strength of surface plasmon resonance in the near-infrared region. Furthermore, we demonstrate plasmon-enhanced photocatalytic performance by overgrowing CdS nanocrystals onto the triangle AuCu nanostars. The hydrogen production rate of the AuCu@CdS heterostars reaches 607 μmol g−1 h−1 under light irradiation (λ > 420 nm), which is 2.94 times the sum of that of the pure CdS nanoparticles and the triangular AuCu nanostars. These observations provide an approach to control the morphology of plasmonic nanoantennas and may find the applications ranging from bio-sensor to photocatalysis.
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高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2022
·Vol. 24
·期 6
·1-16
·
IF 2.533
Yang Yuhang,Zhu Zhongan,Adu-Frimpong Michael,Liu Jing,Wang Yaping,Chen Lin,Toreniyazov Elmurat,Ji Hao,Cao Xia,Shi Feng,Wang Qilong,Yu Jiangnan,Xu Ximing
Licorice chalcone A (LCA) possesses a variety of pharmacological activities amid poor solubility in water which consequently restricts its clinical application. In this study, LCA micelles (LCA-M) and LCA micelles modified with TPGS (LCA-M-T) were prepared, wherein in vitro, in vivo, and hepatoprotection potential of the formulations were evaluated. LCA-M-T and LCA-M were prepared by thin-film dispersion method and characterized by a transmission electron microscope (TEM). The encapsulation efficiency, in vitro release, and stability of LCA-M-T and LCA-M were detected by HPLC and UV, respectively. The pharmacokinetics, tissue distribution studies, and pharmacodynamics research were also carried out after oral administration. The sizes of micellar particles were 34.02 ± 0.29 nm (LCA-M) and 62.46 ± 0.51 nm (LCA-M-T) with 0.223 ± 0.021 (LCA-M) and 0.343 ± 0.006 (LCA-M-T) polydispersities, − 35.06 ± 2.27 mV (LCA-M) and − 38.58 ± 1.69 mV (LCA-M-T) zeta potentials, and 95.2 ± 0.27% (LCA-M) and 90.34 ± 0.31% (LCA-M-T) encapsulation efficiencies. The drug loadings were 8.56 ± 0.27% (LCA-M) and 8.04 ± 0.19% (LCA-M-T). The two preparations released quickly and reached over 95% in the four-dissolution media (pH = 1.2 pH = 6.8 pH = 7 pH = 7.4). The preparations of LCA showed significant elevation of cumulative release compared with the free LCA and more importantly 119% (LCA-M) and 285% (LCA-M-T) increments in the relative oral bioavailability of the drug. Preparations of LCA may act as a promising approach to improve solubility and enhance bioavailability and liver protective activity of LCA.
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高影响因子
RSC Advances
·
2024
·Vol. 14
·期 2
·1150-1155
·
IF 3.9
Shuangying Chen,Fushui Guo,Liantao Hao,Xuliang Zhang
Photocatalysis has received much attention as an environmentally friendly route to manage the emerging organic pollution problems. Herein, BiOBr nanosheets have been synthesized by a hydrothermal method, and then PCN/BiOBr hybrids are designed via a facile wet chemical method. The as-prepared PCN/BiOBr hybrids are characterized by X-ray diffraction (XRD), UV-vis diffuse reflectance spectra (UV-vis DRS), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). The PCN/BiOBr composite exhibits remarkable improved activity in the degradation of 2,4-dichlorophenol (2,4-DCP) as compared to the pristine BiOBr. Based on the ·OH amount-related fluorescence spectra fluorescence and the photoelectrochemistry (PEC) tests, it is confirmed that the enhanced photocatalytic performance of PCN/BiOBr is attributed to the promoted charge separation. Moreover, by means of the radical-trapping experiments it is demonstrated that the formed ·O2− species, as the electron-modulated direct products, are the primary active species during the photocatalytic degradation of 2,4-DCP. This work would provide a feasible design strategy to fabricate high-activity photocatalysts for 2,4-DCP degradation.
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PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Yuxia Zhu,Xiaopu Ren,Yingjie Bao,Shun Li,Zengqi Peng,Yawei Zhang,Guanghong Zhou
Hypothesis Eggplant is rich in polysaccharides . The mechanically homogenized eggplant flesh pulp (EFP) is expected to emulsify and stabilize o/w emulsions. The adsorption and network structure of the polysaccharides are hypothesized to contribute to the stability of emulsions . Experiments Creaming index (CI) and droplet size distribution were observed to evaluate the stabilities of EFP emulsions at different EFP concentrations (0.50, 0.75, 1.00, 1.25 and 1.50% w/v). Optical and fluorescence microscopy, confocal laser scanning microscopy and cryogenic scanning electron microscopy were conducted to observe the emulsification properties of the EFP-stabilized emulsions. In addition, rheological measurements were performed to reveal the EFP emulsions’ rheological behaviours. Findings The prepared oil-in-water emulsion emulsified by EFP remained stable at an EFP concentration of 1.50%. Rheological analysis illustrated that the emulsions had typical shear-thinning property and gel-like nature. The emulsification mechanisms were explained by the formation of an interfacial film adhered to the oil droplets and the coherent three-dimensional network formed by filament and sheet-like polysaccharide strands in the continuous phase. This finding may define a new kind of natural and dietary emulsifier for emulsion-based food, beverage, and pharmaceutical products.
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高影响因子
Frontiers of Chemical Science and Engineering
·
2017
·Vol. 12
·期 1
·32-42
·
IF 1.712
Jiang Yuxia,Wang Donge,Pan Zhendong,Ma Huaijun,Li Min,Li Jiahe,Zheng Anda,Lv Guang,Tian Zhijian
Flower-like intercalated MoS 2 nanomaterials have been successfully synthesized via a microemulsionmediated hydrothermal (MMH) method, and characterized by X-ray diffraction, Raman spectroscopy, element analysis, scanning electron microscopy, transmission electron microscopy, thermogravimetric analysis, and Fourier transform infrared spectroscopy in detail. Their catalytic performance for anthracene hydrogenation was evaluated using a slurry-bed batch reactor with an initial hydrogen pressure of 80 bar at 350 °C for 4 h. The intercalated MoS 2 nanoflowers synthesized from Na 2 MoO 4 (MoS 2 -S) and H 2 MoO 4 (MoS 2 -A) as molybdenum precursors have diameters of about 150 and 50 nm, respectively. MoS 2 nanosheets on MoS 2 -S and MoS 2 -A possess stacking layer numbers of 5–10 and 2–5, and slab lengths of about 15 and 10 nm, respectively. The interlayer distances of MoS 2 -S and MoS 2 -A are both enlarged from 0.62 nm to about 0.95 nm due to the intercalation of NH4 + and surfactant molecules. The MoS 2 nanoflowers have high catalytic activities for anthracene hydrogenation. The selectivity for octahydroanthracene, a deeply hydrogenated product, over MoS 2 -A is 89.8%, which is 31.0 times higher than that over commercial bulk MoS 2 . Fully hydrogenated product (perhydroanthracene) was also detected over MoS 2 nanoflowers with a selectivity of 3.7%. The enhanced hydrogenation activities of MoS 2 nanoflowers can be ascribed to the high exposure of catalytic active sites, resulting from the smaller particle size, fewer stacking layer, shorter slab length and enlarged interlayer distance of MoS 2 nanoflowers compared with commercial bulk MoS 2 . In addition, a possible growth mechanism of MoS 2 nanoflowers synthesized via the MMH method was proposed.
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高影响因子
ACS Applied Materials & Interfaces
·
2014
·
IF 5.9
Wei Cao,Renliang Huang,Wei Qi,Rongxin Su,Zhimin He
Encapsulation of enzymes during the creation of an emulsion is a simple and efficient route for enhancing enzyme catalysis in organic media. Herein, we report a capsule with a shell comprising a monolayer of silica Janus particles (JPs) (referred to as a monolayer capsule) and a Pickering emulsion for the encapsulation of enzyme molecules for catalysis purposes in organic media using amphiphilic silica JPs as building blocks. We demonstrate that the JP capsules had a monolayer shell consisting of closely packed silica JPs (270 nm). The capsules were on average 5–50 μm in diameter. The stability of the JP capsules (Pickering emulsion) was investigated with the use of homogeneous silica nanoparticles as a control. The results show that the emulsion stabilized via amphiphilic silica JPs presented no obvious changes in physical appearance after 15 days, indicating the high stability of the emulsions and JP capsules. Furthermore, the lipase from Candida sp. was chosen as a model enzyme for encapsulation within the JP capsules during their formation. The catalytic performance of lipase was evaluated according to the esterification of 1-hexanol with hexanoic acid. It was found that the specific activity of the encapsulated enzymes (28.7 U mL–1) was more than 5.6 times higher than that of free enzymes in a biphasic system (5.1 U mL–1). The enzyme activity was further increased by varying the volume ratio of water to oil and the JPs loadings. The enzyme-loaded capsule also exhibited high stability during the reaction process and good recyclability. In particular, the jellification of agarose in the JP capsules further enhanced their operating stability. We believe that the monolayer structure of the JP capsules, together with their high stability, rendered the capsules to be ideal enzyme carriers and microreactors for enzyme catalysis in organic media because they created a large interfacial area and had low mass transfer resistance through the monolayer shell.
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高影响因子
APPLIED PHYSICS LETTERS
·
2012
·Vol. 101
·期 1
·
IF 3.844
Zhou Yongcun,Wang Lu,Zhang Hu,Bai Yuanyuan,Niu Yujuan,Wang Hong
A kind of polymer based composites was prepared by embedding the fillers of core-shell Ag@SiO 2 nanoparticles into the polyimide (PI) matrix. The obtained Ag@SiO 2 /PI (50% vf of fillers) composites show remarkably improved high thermal conductivity and low relative permittivity. The maximum value of the thermal conductivity of composites is 7.88 W/(mK) and the relative permittivity and dielectric loss are about 11.7 and 0.015 at 1 MHz, respectively. Compared with self-passivated nanometer Al* particles composites, core-shell Ag@SiO 2 nano-composite is beneficial to increase the thermal conductivity and reduce the permittivity of the composites. The relative mechanism was studied and discussed.
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高影响因子
危险品化学品经营许可证（带存储）