Journal of Materials Chemistry B
·
2014
·Vol. 3
·期 6
·1020-1031
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IF 0
Jianjun Fang,Qi Yong,Kunxi Zhang,Wentao Sun,Shifeng Yan,Lei Cui,Jingbo Yin
In search of an injectable cellular delivery vehicle for tissue regeneration, porous microspheres fabricated from the synthetic polypeptide of poly(γ-benzyl-L-glutamate) (PBLG) were developed. The structural and morphological characteristics of the microspheres could be adjusted by changing the amounts of the gelatin porogen. PBLG microspheres fabricated from 6.5% gelatin content exhibited an average pore diameter of 50.9 ± 10.3 μm and a porosity of 86.58 ± 2.37%. Degradation in vitro of the microspheres could be well controlled by adjusting the molecular weight of PBLG, and the degradability in vivo showed a satisfactory degradation time range from 8 to 12 weeks. Articular chondrocytes, which were seeded within the PBLG porous microspheres, exhibited progressive proliferation and deposition of the cartilaginous extracellular matrix. After cultivation for 2 days in vitro, the PBLG porous microspheres loaded with chondrocytes were injected subcutaneously into nude mice. At 4, 8 and 12 weeks post-injection, neo-generated tissue was harvested for histological observations, which showed a typical cartilage structure and cartilaginous matrix accumulation. A gradual increase of GAG and COL II content in neo-generated tissue was detected by biochemical analysis. These results indicate that the fabricated porous microspheres showing controllable degradation properties, good biocompatibility and cytocompatibility are potentially useful as an injectable vehicle for cartilage tissue engineering.
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ChemSusChem
·
2017
·Vol. 10
·期 8
·1720-1732
·
IF 7.226
Zuojun Wei,Jiongtao Lou,Chuanmin Su,Dechao Guo,Yingxin Liu,Shuguang Deng
Graphical Stability through doping : The embedding of Ru nanoparticles in N-doped mesoporous carbon effectively improve the dispersion and decrease the average size of the Ru nanoparticles, improve the adsorption of levulinic acid, and increase the interaction between Ru and the support. The strategy prevents the Ru nanoparticles from migration, aggregation, and leaching, and consequently increases the reusability of the catalyst. To achieve a higher activity and reusability of a Ru-based catalyst, Ru nanoparticles were embedded in N-doped mesoporous carbon through a hard-template method. The catalyst showed excellent catalytic performance (314 h −1 turnover frequency) and recyclability (reusable five times with 3 % activity loss) for the hydrogenolysis of levulinic acid to γ-valerolactone. Compared with the mesoporous carbon without N-doping and conventional activated carbon, the introduction of N-dopant effectively improved the dispersion of Ru nanoparticles, decreased the average size of Ru nanoparticles to as small as 1.32 nm, and improved the adsorption of levulinic acid, which contributed to the increase in the activity of the catalyst. Additionally, the embedding method increased the interaction between Ru nanoparticles and carbon support in contrast with the conventional impregnation method, thus preventing the Ru nanoparticles from migration, aggregation, and leaching from the carbon surface and therefore increasing the reusability of the catalyst.
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CATALYSIS TODAY
·
2017
·
IF 4.636
Zhijie Wu,Min Zhang,Yirong Yao,Jingtuo Wang,Danhong Wang,Minghui Zhang,Yongfeng Li
1,3-propanediol (1,3-PDO) and γ-valerolactone (GVL) were simultaneously obtained via the hydrogenolysis of glycerol in levulinic acid (LA) using Ru/C catalysts. Ru/C catalyst exhibited a high LA conversion (∼99%) and a high GVL selectivity (∼99%) for the hydrogenation of LA; while a low conversion (∼11%) and little selectivity of 1,3-PDO for the hydrogenolysis of glycerol. LA promoted the hydrogenolysis of glycerol over Ru/C catalyst, in which LA catalyzed dehydration of glycerol into acetol (precursor of 1,2-propanediol (1,2-PDO)), and glycerol acetalization with the hydrogenated GVL into cyclic acetals, resulting in the formation of 1,3-PDO. A reaction scheme involves the formation of cyclic acetal ethers between GVL and glycerol was proposed to explain the product distributions in the one-pot synthesis of 1,3-PDO and GVL. 64.5% conversion of glycerol and 35.8% selectivity of 1,3-PDO together with 99.1% conversion of LA and 85.8% selectivity of GVL were obtained during one-pot converting glycerol and LA with 3.0 MPa H 2 at 200 °C for 6 h. We reported an effective strategy for the preparation of 1,3-PDO by selective hydrogenolysis of dioxan originated from glycerol with aldehydes or ketones.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
·
IF 4.9
Jianfeng Cheng,Ju Wang,Qiao Jiang,Jingli Xie,Shengfei Cao,Qi Zhang,Runqiu Gu
During the long-term deep geological disposal of high-level radioactive waste , buffer materials, such as bentonite , in the waste repositories are irradiated with gamma (γ) rays, affecting their structural stability. Furthermore, bentonite colloids are formed owing to the erosion of bentonite particles by groundwater. However, the effects of prolonged irradiation on the stability of bentonite colloids and their interaction with radionuclides , which can affect the migration of the radionuclides , are yet to be elucidated. Herein, we investigated the stability of colloid prepared from irradiated bentonite with varying doses of γ rays and conducted static adsorption batch experiments to examine their U(VI) adsorption behavior. The results showed that the stability of bentonite colloids was affected by their concentration, storage time, pH, and temperature. An investigation into their polymerization kinetics revealed that the critical coagulation concentration of bentonite colloids decreased with increasing irradiation dose, indicating that the colloids formed from unirradiated bentonite were stable. Furthermore, the U(VI) adsorption capacity of bentonite colloids decreased with increasing irradiation dose. This study provides new insights into the formation and stability of colloids of buffer materials after their irradiation and is expected to contribute significantly to the study of the migration behavior of nuclides by colloidal carriers.
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CANADIAN JOURNAL OF CHEMICAL ENGINEERING
·
2024
·
IF 1.6
Tingting Ge,Hui Guo,Yuchao Li,Jinguo Hao,Yanxia Zheng,Lixi Yang,Haofei Huang,Ming Wang,Cuncun Zuo
Effects of trace oxygen on iron sulphides-supported catalysts (FeS x /γ-Al 2 O 3 ) were evaluated through smelter off-gas reduction process for sulphur synthesis. Catalytic performance was evaluated under different oxygen content conditions. The properties of fresh and used catalysts were investigated by means of X-ray diffraction (XRD), thermogravimetry-differential thermal analysis (TG-DTA), X-ray photoelectron spectroscopy (XPS), and elemental analysis and relationships of active phases and activity were analyzed. The relationship between different active crystal crystals (FeS x , FeS 2 , Fe, FeO, γ-Fe 2 O 3 ) and SO 2 /O 2 adsorption and conversion was investigated. The mechanism of oxygen influence on the FeS x /γ-Al 2 O 3 surface was given and the lifetime of the catalyst in the reaction atmosphere close to real smelter off-gas after dust and oxygen removal steps containing trace oxygen (0.5 O 2 v/v.%) was explored.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2025
·
IF 2.9
Shengkai Liu,Zhisong Li,Jinxia Hou,Peiwen Yang,Chunying Min,Siqi Liu,Xiaoyuan Pei,Ruiqi Shao,Amna Siddique,Zhiwei Xu
Epoxy resin is a widely used polymer. However it will generate highly reactive free radicals when exposed to radiation, which impacts its physical and chemical structure. In this study, graphene quantum dots were integrated into the epoxy resin matrix as free radical scavengers to enhance its stability in irradiated environments. Notably the oxide layer of the epoxy resin measured approximately 480 μm in thickness, whereas that of the GQD/EP nanocomposites was significantly thinner, at about 180 μm. After irradiation, the mechanical properties of the epoxy resin decreased by 49%, and the glass transition temperature decreased by 4.4 °C. In contrast the mechanical properties of GQDs/EP nanocomposites decreased by 35%, and its glass transition temperature decreased by only 2.2 °C. These findings indicate that GQDs nanoparticles can effectively enhance the radiation resistance of epoxy resins. Furthermore, we explored the mechanism by which GQDs scavenge free radicals within the epoxy resin matrix.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Nan Shi,Hengxi Zhu,Jiamin Qi,Bin Li,Jin Zhang
Carbonyl sulfur (COS) was difficult to be removed by conventional desulfurization technologies because of its stable chemical properties. Mesoporous γ-Al 2 O 3 (MA) showed excellent potential for hydrolysis of COS, but the catalyst life was greatly shortened with the progress of the reaction. Therefore, improving the catalyst life is the key to MA which can apply to hydrolysis of COS. In this study, P123 modified mesoporous γ-Al 2 O 3 (P-MA) catalyst was prepared by sol–gel method, and it was regulated by template agent and acidity regulator. These preparation conditions of P-MA were optimized to improve the hydrolysis efficiency of COS. The effects of temperature, space velocity, relative humidity and oxygen concentration for the hydrolysis efficiency of COS were studied. The results show that the optimized P-MA catalyst is suitable for COS low-temperature hydrolysis reaction, and it can maintain 99 % for 10 h under the tough reaction conditions. The only crystal of P-MA was γ-Al 2 O 3 with large specific surface area and uniform distribution pore, which are beneficial to the COS hydrolysis. In addition, the hydrolysis efficiency of COS can also remain 97 % for 10 h in the O 2 and CO 2 atmosphere, indicating that the P-MA catalyst has a specific anti-poisoning ability. The kinetics and reaction mechanism of COS catalytic hydrolysis were studied, which showed that the adsorption of H 2 S was the key to hindering the continuous reaction. The P-MA can effectively inhibit the adsorption of H 2 S, which greatly improved COS hydrolysis life of P-MA. This study provided a theoretical basis for the application of Al 2 O 3 catalyst in the COS hydrolysis.
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INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Xing Liu,Ting Zhang,Lei Zhou,Ming Li,Rongxing He
A highly luminescent (C13H28N2)2Cu4I8 single crystal containing isolated γ-[Cu4I8]4– anionic cluster was synthesized without the use of unsaturated cations. To the best of our knowledge, compounds bearing such like anions are not dual-emitting under UV excitation. However, dual emission does occur in (C13H28N2)2Cu4I8. Moreover, the emission bands were found to be temperature-sensitive, allowing tuning of the emission colors from blue (0.19, 0.20) to green (0.33, 0.47) in the Commission International de L’ Eclairage (CIE) chromaticity coordinates. Remarkably, the color could be restored on returning to the initial temperature, confirming an efficient and reversible luminescent thermochromic effect in (C13H28N2)2Cu4I8. The origin of this excellent optical performance is discussed, and the difference in the mechanism with the dual-emissive Cu(I) halide complexes is also elucidated. Overall, our work provides a promising way to achieve efficient luminescent thermochromism. The developed (C13H28N2)2Cu4I8 represents one of the viable alternatives for eco-friendly luminescent thermochromic materials.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Yanli Zhao,Ziqi Cao,Yanxiang Liang,Zhichen Liang,Keyin Ling,Feiyan Zhou,Changsheng Guo,Yao Qian,Pengbi Liu,Xi Liu,Chunguang Wang,Mengchen Zhang,Qinglei Zhang
Membrane consisting of high-throughput aligned ion channels has been pursued for precise Li + /Mg 2+ separation. Herein, an aligned amino-functionalized γ-cyclodextrin nanofiltration membrane was fabricated via a customized interfacial polymerization technique, where the orientation of cyclodextrin ion channels was elaborately tailored by controlling the reaction conditions. The as-fabricated membrane featured ultra-thin selective layer of ∼ 26 nm, average pore size of ∼ 0.72 nm, and ultra-stable positive surface charges. In particular, the aligned intrinsic cyclodextrin cavities in the membrane offered vertical shortcuts for preferential Li + transport. Taking advantage of these, superior membrane permselectivity was achieved with the water permeance of 6.5 L·m −2 ·h −1 ·bar −1 and the Li + /Mg 2+ separation factor up to 22.5, highlighting the great potentials in lithium extraction and other ion separations. Given its simplicity and generality, this customized interfacial polymerization strategy holds great promise for manipulating aligned transport channels in thin film composite membranes, thereby enhancing their performance in a wide range of applications including, but not limited to, desalination, water purification, resource extraction, and energy conversion.
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Catalysts
·
2024
·Vol. 14
·期 12
·885
·
IF 3.8
Yulin Sun,Yiwei Zhang,Baoqing Hou,Yong He,Wubin Weng,Yanqun Zhu,Zhihua Wang
Formaldehyde (HCHO) is known as one of the important indoor organic pollutants. How to remove and decompose the low concentration of formaldehyde at room temperature is important for indoor environments. Catalytic ozonation is an efficient method to thoroughly remove HCHO at room temperature, with high efficiency and few byproducts. A series of MnOx/γ-Al2O3catalysts were prepared in this work via the impregnation method and treated with different reagents (acid, alkali, and H2O2) to evaluate their catalytic activity for HCHO removal. The results showed that MnAl-II (acid treatment) performed well in activity tests, reaching a nearly 100% HCHO conversion at an O3/HCHO of 2.0 and attaining a CO2selectivity of above 95% at an O3/HCHO of 3.0 at 30 °C, with almost no ozone residual existing. The larger specific surface area, abundant oxygen vacancies, and higher number of acid sites contributed to the excellent performance of MnAl-II. Stability and H2O resistance tests of MnAl-II were also conducted. To reveal the intermediate product formation and further investigate the reaction mechanism of HCHO ozonation, in-situ DRIFTS measurement was carried out combined with DFT calculations.
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Materials Science & Engineering C-Materials for Biological Applications
·
2020
·
IF 5.88
Liwei Sun,Lingjie Song,Xu Zhang,Rongtao Zhou,Jinghua Yin,Shifang Luan
Pathogenic bacterial infections associated with wound healing progress usually result in serious complications. Herein, biocompatible and antimicrobial electrospun nanofibrous mats with photodynamic therapy (PDT) effect were fabricated to accelerate the infected wound healing. The nanofibrous mats were fabricated by co-electrospining of polyanionic poly(γ-glutamic acid) (γ-PGA) and cationic photosensitizer 5,10,15,20-tetrakis(1-methylpyridinium-4-yl)porphyrin tetra (p-toluenesulfonate) (TMPyP) in aqueous solution and stabilized by the chemical crosslinking. The as-prepared nanofibrous mats can not only confer the moist microenvironment to the wound bed, but also provide potent bactericidal activity upon visible light irradiation by releasing the cytotoxic reactive oxygen species (ROS). The antibacterial assay in vitro showed that they can effectively eradicate the board-spectrum bacteria at a relatively low loading dose of TMPyP ( e.g. , 0.1 wt%). Meanwhile, those nanofibrous mats showed good biocompatibility with no obvious adverse effects on mammalian cells and red blood cells (RBCs). The animal test in vivo suggested that the restrained inflammatory reaction and better wound healing could be achieved upon timely and effective antibacterial treatment with negligible local toxicities. This biocompatible and antibacterial γ-PGA-TMPyP nanofibrous mat may show great potential in practical infection-resistant applications, particularly for wound dressing applications.
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JOURNAL OF CATALYSIS
·
2024
·
IF 6.5
Jingru Qiu,Guo-Qing Yang,Jiachang Zuo,Xiaoying Liu,Zhipeng Lan,Weikun Chen,Zhong-Wen Liu,Youzhu Yuan
The selective oxidation of methyl glycolate (MG) to methyl glyoxylate (MGO) using molecular oxygen in a fixed-bed reactor represents a greener and more efficient alternative to the traditional batch processing for producing this important fine chemical and intermediate. Despite its potential, detailed understanding of this catalytic reaction is still limited. In our study, VO x / γ -Al 2 O 3 catalysts were identified as effective for the reaction, but their performance strongly depended on the structure of VO x species. The optimal catalyst with nearly monolayer dispersed VO x achieved a high MG conversion of 91% and an MGO selectivity of 71%, alongside maintaining stability for 300 h without noticeable deactivation. At a low V loading of 0.6%, isolated VO x species were formed, exhibiting the highest turnover frequency (TOF) but the lowest MGO selectivity. Increasing the V loading to 3.9% resulted in a blend of less polymeric and isolated VO x species, which decreased the TOF but enhanced MGO selectivity to 59%. With the V loading ranging from 5% to 6.2%, monolayer dispersed VO x became dominant, yielding a lower TOF and the highest MGO selectivity. A further increase in V loading caused the emergence of crystalline V 2 O 5 , which seemed to act as a bystander. Moreover, the redox cycles of V 4+ and V 5+ over the VO x / γ -Al 2 O 3 catalyst played an important role in the selective oxidation of MG to MGO, while the overoxidation of MG to CO 2 might take place through the V 3+ /V 4+ redox pairs, the extent of which was determined by the structure of VO x species. These insights are crucial for developing high-performance VO x -based catalysts for the production of MGO through the selective oxidation of MG.
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