RSC Advances
·
2014
·Vol. 5
·期 7
·5164-5172
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IF 3.708
Yuhao Xiong,Fanggui Ye,Cong Zhang,Shufen Shen,Linjing Su,Shulin Zhao
A novel and inexpensive approach was adopted to develop magnetic porous γ-Fe2O3/C@HKUST-1 composites for the adsorption of dyes and heavy metal ions from aqueous solution. The γ-Fe2O3/C with unique functional groups present such as –OH and –NH2 was used as the support to directly grow HKUST-1 by a stepwise liquid-phase epitaxy process. The crystallographic, morphology, and magnetic properties as well as porosity of the as-synthesized γ-Fe2O3/C @HKUST-1 composites were carefully studied by XRD, SEM, TEM, XPS, TGA, and BET. The results indicated that the BET surface area, micropore volume, and saturation magnetization of the γ-Fe2O3/C @HKUST-1 are 993.4 m2 g−1, 0.69 cm3 g−1, and 12.6 emu g−1, respectively. In addition, a uniform distribution of ultrafine γ-Fe2O3 nanoparticles with an average diameter of 2–3 nm was observed in the γ-Fe2O3/C@HKUST-1 composites. Our results showed that methylene blue (MB) and Cr(VI) (used as a model for typical dye pollutants and heavy metal ions) are effectively removed from aqueous solutions by γ-Fe2O3/C@HKUST-1. The maximum adsorption capacities were 370.2 and 101.4 mg g−1 of adsorbent for MB and Cr(VI), respectively. Moreover, a removal efficiency of about 90% was retained after five cycles of consecutive adsorption–desorption. The adsorption kinetics data were well described by a pseudo-second-order model (R2 > 0.99), and equilibrium data were well fitted to the Langmuir isotherm model (R2 > 0.99). Finally, our results suggested that the γ-Fe2O3/C@HKUST-1 composites have a great potential to be employed for treatment of wastewater containing MB and Cr(VI).
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RSC Advances
·
2016
·Vol. 7
·期 1
·336-343
·
IF 3.289
Tao Chen,Yuhao Xiong,Yuemei Qin,Haiguan Yang,Peng Zhang,Fanggui Ye
In this study, a novel and low-cost method was developed for synthesizing magnetic porous γ-Fe2O3/C as an adsorbent and catalyst for removal of methylene blue (MB) from aqueous solution. Using FeCl3·6H2O and bagasse as the precursor, the biomass-based material was synthesized rapidly using a microwave heating process. Fe ions were introduced to achieve both adsorption and catalytic degradation by the Fenton reaction. Characterization by BET, XRD, SEM, and TEM indicated that the prepared γ-Fe2O3/C material exhibited homogeneous mesoporosity with a BET surface area, mesoporous volume, and saturation magnetization of 764.116 m2 g−1, 0.54 cm3 g−1, and 17.1 emu g−1, respectively. The material exhibited excellent adsorption and catalytic degradation abilities for removal of MB from aqueous solution (up to 352.96 mg g−1), with complete degradation of MB within 30 min. Moreover, γ-Fe2O3/C had good stability over 5 cycles. Therefore, this biomass-based γ-Fe2O3/C material can be used as a highly effective and low-cost adsorbent and catalyst and has great potential application in clean-up processes for environmental pollutants.
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CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Xiao Ge,Juntao Liu,Xiangyang Song,Guozhong Wang,Haimin Zhang,Yunxia Zhang,Huijun Zhao
The hierarchical flower-like iron containing γ-MnO 2 hollow microspheres assembled by ultrathin nanosheets have been successfully fabricated via a facile one-step co-precipitation route in the absence of additional templates or surfactants. Structural characterization show that iron element is uniformly incorporated into γ-MnO 2 framework, and no segregated iron oxide appears. The resulting iron containing MnO 2 hollow microspheres exhibit a noticeable enhanced performance for As(III) removal compared to that of the undoped counterparts, accompanied by 102.84 mg/g of the saturated removal capacity towards As(III). The excellent performance for the arsenic removal may be attributed to the unique structural characteristics of highly accessible surface and fully exposed active sites inherited from the hierarchical iron containing γ-MnO 2 samples. The co-existence of oxidation and adsorption is another key factor for the improvement of As(III) removal efficiency, in which manganese dioxide is mainly responsible for oxidizing As(III) to As(V) and ferrous species may serve to the adsorption of the generated As(V), as evidenced by X-ray photoelectron spectroscopy (XPS) analysis. Importantly, the composites exhibit an excellent regenerative ability over three cycles without a significant decrease in its removal efficiency towards As(III). Furthermore, the relatively large micrometer-scale particles can be easily separated by filtration, accompanied by fewer secondary contaminants risks than nanoparticles. Therefore, the fabricated hierarchical Fe-containing γ-MnO 2 hollow spheres in the present study will be an excellent candidate for the arsenic transformation and removal from the contaminated water based on the synergistic effects of effective oxidizing and adsorptive performance, good regeneration together with the convenient separation.
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JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
·
2025
·
IF 2.8
Qingqing Yao,Jiatai Yin,Xiuli Ji,Xue Li,Yifan Gao,Dan Lu,Ying Chen,Qian Li,Dalong Zhi
Despite considerable efforts invested in clinical trials aimed at treating obesity and enhancing the metabolic profiles of Nelumbinis Folium , the precise phytochemicals involved and their mechanisms of action remain unclear due to the absence of an efficient screening technique. Herein, Nelumbinis Folium serves as the focal point to elucidate the bioactive compounds that specifically bind to peroxisome proliferator-activated receptor γ using immobilized receptor chromatography. Following identification through liquid chromatography-mass spectrometry, the compounds were further evaluated using chromatographic techniques and molecular dynamics simulations. The results unveiled catechin and hypericin as the receptor-binding compounds present in Nelumbinis Folium , with hypericin exhibiting a stronger affinity and a faster dissociation rate constant compared to catechin. Molecular dynamics studies highlighted the crucial role of cysteine located at position of 285 in the receptor ligand binding domain during the initial ligand capture phase. Subsequently, Van Der Waals forces and electrostatic interactions facilitated the binding process. The calculated standard binding free energies were − 61.75 ± 2.61 kcal/mol for hypericin and − 43.19 ± 0.63 kcal/mol for catechin. Collectively, these findings provide valuable insights into receptor-drug interactions and confirm the effectiveness of immobilized receptor chromatography in screening potential lead compounds from complex systems.
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PubMed
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COMPOSITES PART B-ENGINEERING
·
2024
·
IF 12.7
Lingli Liu,Shiyuan Ma,Zhisheng Xiao,Jintao Li,Yue Wang,Zhihui Lu,Yitao Zhao,Jinshan Guo
Rapid bone defect regeneration in osteoporotic conditions remains a significant challenge due to the fragile mechanical stability and pathological microenvironment. The absence of bone matrix is the primary characteristic of these defects, and advanced strategies for treating osteoporotic bone defects focus on remodeling the bone matrix's spatial structure and regulating the microenvironment. While many hydrogels have been developed for bone regeneration, their use in repairing osteoporotic bone defects is constrained by deficiencies in shape-adaptivity, weak osteogenic bioactivity, and lack of physiological mechanical support. Herein, a novel bioactive hydrophilic semi-caged NH 2 -T4 silsesquioxane (NH 2 -T4-POSS) nanocage was developed, which was used to modify γ-polyglutamic acid (γ-PGA) together with dopamine, to give an organic/inorganic hybrid hydrogel PGA-DA&T4 for osteoporotic bone regeneration. The developed PGA-DA&T4 hydrogel possesses favorable injectability, shape-adaptivity, self-healability, and strong antioxidant ability. Benefited from organic/inorganic hybridation and multidimensional molecular interacting mechanism, PGA-DA&T4 exhibites enhanced thermal stability and longer degradation period, unique self-polymerizability, high elasticity, and considerable tissue adhesion ability. In vitro experiments proved that PGA-DA&T4 is biocompatible, and is able to promote cell migration and neovascularization, and possesses favorable immunoregulatory to promote macrophage polarization towards anti-inflammatory M2 phenotype. Furthermore, PGA-DA&T4 has been demonstrated to accelerate osteogenic differentiation and inhibit osteoclastogenesis, thereby promoting the repair of osteoporotic bone defects. Our research successfully developed a novel hybrid γ-PGA hydrogel with therapeutic effects and supplied a promising biomaterial with potential clinical application for repairing osteoporotic bone defects.
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NANOTECHNOLOGY
·
2018
·Vol. 29
·期 7
·075708
·
IF 3.404
Hengcong Tao,Jingjing Ding,Chao Xie,Yunnan Gao,Jinliang Song,Zhenyu Sun
We demonstrate a facile and versatile method to grow Ru particles uniformly on pristine few-layer graphene (FLG) in supercritical diethylamine. In particular, a large number of Ru subnanometer clusters less than 1.0 nm were observed. The particle size can be tuned by manipulating the loading content of Ru and controlling the reaction temperature. The resulting Ru/FLG showed remarkably high activity, selectivity, and reusability towards the hydrogenation of levulinic acid to γ-valerolactone. This method is flexible, and can be extended to the synthesis of a variety of other ultrafine metal particles supported on FLG.
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Journal of Physical Chemistry C
·
2012
·
IF 4.805
Le Xin Song,Yue Teng,Jie Chen
The first part of the study is devoted to the comparison between the doping effect of urea (a small molecule) and polyethylene glycol (PEG, a long-chain polymer) on the physical property of metallic gallium (Ga). The physical properties of the Ga composited in the two materials, Ga/urea and Ga/PEG, were investigated by scanning electron microscopy, X-ray powder diffraction, X-ray photoelectron spectroscopy, differential scanning calorimetry, superconducting quantum interference device, and surface-enhanced Raman scattering spectra and compared with our previous results for the effect of macrocyclic hosts (e.g., cyclodextrins, calixarenes) on the physical modification of metallic Ga. Our data provide new direct evidence that the modification of physical properties of Ga is highly dependent on the nature of dopants used. For example, the addition of a small amount of urea causes a fundamental change in the crystallization behavior of Ga, and the presence of PEG results in the occurrence of a weak paramagnetism of Ga at high fields, both of which are completely different from the effect of other dopants. The other part of the study is devoted to demonstrating whether there is a significant difference in the oxidation process of metallic Ga and its composites. Our result gives a strong positive answer to the question. β- and γ-gallium oxide nanocrystals were obtained by sintering the Ga/urea composite at different temperatures and exhibited distinctive photoluminescence and photocatalysis properties. These results gave a strong impression that the introduction of different dopants leads metallic Ga to generate different features in microstructure, physical property, and especially chemical reactivity. We believe that the findings of this study have important implications for the development of inorganic materials.
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MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Mingcai Yao,Guang Luo,Yifan Ran,Chenyang Li,Liang Dong
A chloramphenicol (CAP) electrochemical sensor based on zinc tungstate and magnetic hematite (ZnWO 4 /γ-Fe 2 O 3 ) magnetic molecularly imprinted polymer (ZnWO 4 /γ-Fe 2 O 3 /MIP) is proposed. First, ZnWO 4 , γ-Fe 2 O 3 nanomaterials were synthesized by one-step hydrothermal method, and then ZnWO 4 , magnetic nanoparticles were combined with molecularly imprinted polymers, that is, ZnWO 4 /γ-Fe 2 O 3 was coated with a molecularly imprinted (MIP) shells by precipitation polymerization method to prepare magnetic molecularly imprinted nanomaterials, and then modified on glassy carbon electrodes to construct an electrochemical sensor for the determining of CAP. The results show that under the optimal conditions, the ZnWO 4 /γ-Fe 2 O 3 /MIP (MMIP) modified electrode has a stronger CAP detection reduction peak current than the one-component electrode, and exhibits better electrocatalytic activity, which is an excellent electrochemically modified electrode. Compared to magnetic non-molecular imprint sensors (MNIP), MMIP sensors have higher detection efficiency. The linear range of ZnWO 4 /γ-Fe 2 O 3 /MIP/GCE for the detection of CAP was 0.12 ∼ 1224 μM, and the detection limit was 0.034 μM, showing excellent stability and reproducibility, and good selectivity in the presence of different interferences. ZnWO 4 /γ-Fe 2 O 3 /MIP/GCE was applied to the detection of CAP in milk samples with satisfactory results.
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NEW JOURNAL OF CHEMISTRY
·
2024
·
IF 2.7
Zhuangzhuang Niu,Pengqi Zhu,Gang Li,Caifang Gao,Yuqin Liu,Xiaoli Liu,Jinghua Sun,Ruiping Zhang
Excessive ultraviolet (UV) radiation can cause human skin erythema, tanning, inflammation and other adverse reactions. Human skin can spontaneously synthesize endogenous melanin under UV radiation to defend the damage of UV, but the skin problems such as light damage and light aging cannot be avoided due to its low UV shielding efficiency. Therefore, we design a natural and biocompatible PGDA (PDA-L doped sunscreen hydrogel) sunscreen hydrogel by crosslinking melanin-like L-lysine doped polydopamine (PDA-L) and amino acid biopolymer poly-γ-glutamic acid, which displays good biosafety, efficient UVA shielding performance and excellent anti-inflammatory performance in the application of the skin protection of sun and repair after sunburn. The introduction of PDA-L to the hydrogel can improve the absorption intensity in the UV region and antioxidative performance of the hydrogel. Meanwhile, the usage of biocompatible PGDA sunscreen hydrogel can avoid the skin oxidative damage and penetrative toxicity of the conventional sunscreen.
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APPLIED CATALYSIS A-GENERAL
·
2025
·
IF 4.8
Weimeng Cai,Haojie Du,Erju Wang,Yuting Qiang,Kunhong Hu,Jianhua Guo
The synthesis of value-added chemicals from renewable biomass is becoming increasingly important in the transition to a sustainable and low-carbon energy system. Herein, we demonstrate a solvent-polarity modulation strategy to engineer biomass-derived Cu-MOF using 2,5-furandicarboxylic acid (FDCA) as a renewable ligand, where tailored β/α ratios via Kamlet-Taft parameters balance nucleation-growth kinetics to optimize textural properties. Pyrolyzed Cu-MOF at 500 °C under a nitrogen atmosphere yield the Cu/C catalysts, which were subsequently employed in the selective hydrogenation of levulinic acid (LA) to γ-valerolactone (GVL). Among the various solvents used, the Cu-MOF precursor synthesized in a mixed solvent of methanol and N, N-dimethylformamide (DMF) demonstrated the highest catalytic performance, outperforming those synthesized in other solvents. This highlights the significant impact of solvent selection on the structure of Cu-MOF, which in turn affects their hydrogenation activity. Advanced characterization confirming that the uniform Cu dispersion (confirmed by HRTEM mapping) and Cu⁰/Cu⁺ electronic synergy (via Cu Auger analysis) enhanced hydrogenation performance. Additionally, the biomass-derived catalysts exhibited excellent durability. Overall, this research provides a promising approach to develop highly efficient catalysts using renewable ligands and demonstrates the potential of regulating catalyst properties through the strategic selection of solvents, as informed by Kamlet-Taft parameters.
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JOURNAL OF INORGANIC BIOCHEMISTRY
·
2020
·
IF 3.212
Zhijun He,Menghuan Wang,Qionghui Zhao,Xiaoqian Li,Pengan Liu,Bingyu Ren,Chong Wu,Xiubo Du,Nan Li,Qiong Liu
Neuronal apoptosis caused by amyloid-beta (Aβ) overproduction is one of the most important pathological features in Alzheimer's disease (AD). Endoplasmic reticulum (ER) stress induced by Aβ overload plays a critical role in this process. Bis(ethylmaltolato)oxidovanadium (IV) (BEOV), a vanadium compound which had been regarded as peroxisome proliferator-activated receptor γ (PPARγ) agonist, was reported to exert an antagonistic effect on ER stress. In this study, we tested whether BEOV could ameliorate the Aβ-induced neuronal apoptosis by inhibiting ER stress. It was observed that BEOV treatment ameliorated both tunicamycin-induced and/or Aβ-induced ER stress and neurotoxicity in a dose-dependent manner through downgrading ER stress-associated and apoptosis-associated proteins in primary hippocampal neurons. Consistent with in vitro results, BEOV also reduced ER stress and inhibited neuronal apoptosis in hippocampi and cortexes of transgenic AD model mice. Moreover, by adopting GW9662 and salubrinal , the inhibitor of PPARγ and hyperphosphorylated eukaryotic translation initiation factor 2α, respectively, we further confirmed that BEOV alleviated Aβ–induced ER stress and neuronal apoptosis in primary hippocampal neurons by activating PPARγ. Taken together, these results provided scientific evidences to support the concept that BEOV ameliorates Aβ–induced ER stress and neuronal apoptosis through activating PPARγ.
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PubMed
高影响因子
FUEL
·
2016
·
IF 3.611
Libo Qin,Yang Zheng,Dianqing Li,Yunshan Zhou,Lijuan Zhang,Zareen Zuhra
The composite material HPW/NH 2 –Al 2 O 3 was successfully prepared by immobilization of phosphotungstic acid H 3 PW 12 O 40 (HPW) on the surface of amino functionalized spherical millimeter-sized mesoporous γ-Al 2 O 3 beads (NH 2 –Al 2 O 3 ), that featured high specific surface area, remarkable enhanced mechanical strength, chemical stability and low cost. This composite material was characterized by Fourier Transform Infrared Spectroscopy (FTIR), X-ray diffraction (XRD), Brunner−Emmet−Teller (BET) and mechanical strength measurements. The experimental results showed that introduction of NH 2 group in between HPW and Al 2 O 3 surface not only provide strong binding sites for catalytic centers HPW to get high dispersion on the carrier surface but also prevent HPW from structural decomposition. As a consequence, the prepared HPW/NH 2 –Al 2 O 3 exhibited excellent catalytic performance in the oxidative desulfurization of model oil composed of dibenzothiophene (DBT) and n-octane. The 350 ppmw S of sulfur content in 20 mL of n-octane can be dropped down to 2.8 ppmw S in 2 h using 60 mg of HPW/NH 2 –Al 2 O 3 catalyst under the optimal conditions. Remarkably, the catalyst can be conveniently recycled by simple decantation method. After 10 times recycling, the oxidation desulfurization efficiency just dropped down slightly from 99.2% to 98.6%. The results indicate that synthesized HPW/NH 2 –Al 2 O 3 beads have great potential as a catalyst in oxidative desulfurization for special practical applications.
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