APPLIED CATALYSIS A-GENERAL
·
2017
·
IF 4.339
Xiangjuan Yuan,Shule Duan,Guangyu Wu,Lei Sun,Gang Cao,Dongya Li,Haiming Xu,Qiang Li,Dongsheng Xia
A series of functional organic-metal zinc oxide (ZnO) doped graphitic carbon nitride (g-C 3 N 4 ) denoted as ZnO-CN composites were fabricated via a facile mixing and calcination approach. The composition, structure, and morphology of the as-prepared ZnO-CN composites were characterized by X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET) surface area, fourier transform infrared (FT-IR), field emission scanning electron microscope (FESEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS), respectively. When loading amount of ZnO is 0.1 and calcination temperature is 650 °C (denoted as ZnO-CN 0.1 -650), the kinetic constant of atrazine (ATZ) degradation was 2.73 min −1 , which was almost 10.5 times higher than that of ozone alone, exhibiting the highest catalytic ozonation activity. The results of the characterization indicated that ZnO-CN 0.1 -650 presents the mesoporous structure in laminated g-C 3 N 4 and Zn(II) are strongly coordinated and stabilized within the electron-rich g-C 3 N 4 framework. The feasibility of ZnO-CN 0.1 -650 for practical application was further evaluated at different catalyst dosages, initial ATZ concentrations, solution pHs, and natural organic matters. Radical scavengers experiments demonstrated that O 2 − , OH, and 1 O 2 are the dominant reactive radical species. In addition, the composite showed excellent stability for pollutants removal over multiple reaction cycles. A possible mechanism of the enhanced catalytic ozonation activity is attributed to the host-guest interaction between ZnO and g-C 3 N 4 , as well as the improved meso-porosity, increased surface area, and intensive mass and electron transfer ability ascribed to the electronic and surface properties modification. Overall, the ZnO-CN 0.1 -650 composite is demonstrated to be a highly efficient, stable, and recoverable catalyst, which provided a promising alternative in catalytic ozonation.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 21
·10070-10077
·
IF 3.3
Meng Zhang
The yield of the synthesis of diethyl carbonate only from CO2 and ethanol is ca. 5–15% unless an expensive third monomer is added. To the best of our knowledge, this work represents the first report of the DEC yield exceeding 50% without adding a third monomer. A multiple functional composite support “@3A-CaO–CaC2” is the key to the huge increase of the DEC yield. The yield was 3.93% when catalyzed by Fe2O3–ZrO2–ZnO (1 : 1 : 1) while the yield was 57.7% when catalyzed by 15 wt% Fe2O3–ZrO2–ZnO@3A-CaO–CaC2. 3A provided a strong skeleton network and physically removed water; CaO played a role in chemically removing water; CaC2 played a role in chemically removing water rapidly. Our results suggest that chemical water removal has a more significant effect than physical water removal. Moreover, the water removal rate rather than water removal capacity is the key to increase the DEC yield. In summary, the contribution of this work is that the multifunctional composite carrier realizes the function of in situ water removal, thus greatly improving the efficiency of the catalyst from 3.93% up to 57.7%.
研究领域:
化学工程
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材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2025
·Vol. 40
·期 2
·382-388
·
IF 1.1
Cao Tian,Li Wei,Ren Lin,Song Tao,Song Jie,Lin Jiacheng,Yang Li,Liu Wenxiu,Wang Ping,Feng Shaojie
The adsorption of phosphate was conducted by the complex of chitosan/polyacrylamide/ferric(CS/PAM/Fe(III)) prepared. The SEM images and XPS spectra confirmed the successful adsorption of phosphate. The adsorption process was studied by varying the influencing aspects like pH, co-existing ions, contact time, and initial phosphate concentration. The experimental results indicate that the adsorptive capacity decreases with the increase of pH. However, it is commendable that there is still a adsorption capacity of more than 5 mg/g when the pH is 8–11. The adsorption kinetics can be accurately described by the pseudo-second-order model and is controlled by both chemisorption and surface diffusion. The adsorption process is a single layer adsorption. This paper proposed that the adsorption mechanism of CS/PAM/Fe(III) complex is the joint action of electrostatic attraction and ligand exchange.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Xiaozhou Wang,Jiannan Li,Wanting Chen,Bo Pang,Yong Liu,Yusong Guo,Xuemei Wu,Fujun Cui,Gaohong He
A comb-shape amphiphilic cationic side chain is proposed to well-balance the water sorption in anion exchange membranes (AEMs), in which the cationic group is in between of an ether-containing hydrophilic spacer and an alkyl hydrophobic spacer. By fully grafting the amphiphilic side chains onto polybenzimidazole (PBI), comb-shape amphiphilic microphase networks are well-developed in the AEMs, in which the alkyl hydrophobic network greatly restricts water swelling and the ether-containing hydrophilic network keeps the hydration of the cationic groups and enlarges the ion conductive channel. The as-prepared membranes achieve a high conductivity of about 91.2 mS cm–1, an extremely low swelling ratio of about 8.1% at 80 °C, and good mechanical properties at a hydrated state (tensile strength and elongation at a break of about 14.6 MPa and 77.5%, respectively). Benefits from the balanced water sorption in AEMs, the H2/O2 fuel cell with a 10 μm ultrathin membrane could withstand 80 °C and 0.1 MPa back pressure and achieve a high open circuit voltage of about 1.0 V and a high peak power density of about 631.5 mW cm–2. This work provides a new insight into the design of high-performance AEM.
研究领域:
材料科学
·
能源工程
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Wei Ting Gao,Xue Lang Gao,Wei Wei Gou,Jia Jun Wang,Zhi Hong Cai,Qiu Gen Zhang,Ai Mei Zhu,Qing Lin Liu
The development of high-performance anion exchange membranes (AEMs) has become more urgent for fuel cells. One of the critical challenges is to prepare AEMs with sufficient ion conductivity and robust alkaline endurance. In this work, bulky twisted binaphthyl units are introduced into the backbones of AEMs by a one-pot superacid-catalyzed polymerization to enhance both the conductivity and stability. The binaphthyl unit can depress the chain packing density and enlarge the free volume of the AEMs, conducing to form well-defined microphase separation and to build well-developed ion-conductive highways. The poly(binaphthyl piperidinium)-based AEM (QABNP) shows the highest OH − conductivity of 135.25 mS cm −1 superior to the poly(quaterphenyl piperidinium)-based AEM (QAQPP) (109.12 mS cm −1 ). Meanwhile, the QABNP AEM exhibits about 90% conductivity retention after being tested in a harsh alkaline environment (2 M NaOH at 80 °C) for 1080 h. Importantly, the QABNP based single cell possesses the highest peak power density (PPD) of 1.16 W cm −2 at a high current density of 2.37 A cm −2 with a low high frequency resistance (HFR) of 0.04 Ω cm 2 . This study demonstrates the merits of bulky twisted binaphthyl incorporated in a polymer backbone for improving AEM performances.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
Biomaterials Advances
·
2022
·
IF 0
Lianghua Jiang,Xufeng Yang,Yijian Zhang,Dawei He,Yijun Gao,Ke Lu,Yanming Hao,Yan Gao,Daming Lu,Xiangyun Jin,Chong Li
Accelerating angiogenesis of diabetic wounds is crucial to promoting wound healing. Currently, vascular endothelial growth factor (VEGF), an angiogenesis-related bioactive molecule, is widely used in clinic to enhance wound angiogenesis, but it faces problems of inactivation and low utilization due to harsh microenvironment. Here, we developed a novel reactive oxygen species (ROS)-scavenging hydrogel aimed to polarize macrophages toward an anti-inflammatory phenotype, inducing efficient angiogenesis in diabetic wounds. This composite hydrogel with good biosafety and mechanical properties showed sustainable release of bioactive VEGF. Importantly, it could significantly reduce ROS level and rapidly improve wound microenvironment, which ensured the activity of VEGF in vitro and in vivo and successful healing eventually. At the same time, the composite hydrogel exhibited excellent antibacterial properties. In vivo results confirmed good anti-inflammatory, stimulated vascularization and accelerated wound healing attributed to the novel ROS-scavenging hydrogel, which might serve as a promising wound dressing in diabetic wound healing.
研究领域:
生物医学工程
·
伤口愈合
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材料科学
·
药剂学
✓ 已验证
产品关联
DOI
PubMed
FIBERS AND POLYMERS
·
2023
·Vol. 24
·期 8
·2743-2750
·
IF 2.5
Fu Sida,Li Haidong,Jiang Yue,Zhao Yan,Xu Zhiguang
In this study, superamphiphilic fabrics with under-oil superhydrophilic property have been prepared using trimesoyl chloride (TMC), tetrakis(hydroxymethyl) phosphonium chloride (THPC), and urea as coating materials. Owing to the unique under-oil superhydrophilicity, the coated fabric is able to absorb water droplets dispersed in oil, and oil stains on the coated fabric (dry) can be easily cleaned off just by rinsing with water (without the use of detergent), showing strong anti-oil-fouling ability. The coating is durable enough to withstand at least 50 cycles of home laundering, 1000 cycles of Martindale abrasions, as well as acid/base etching for 12 h without losing its under-oil superhydrophilic property. Meanwhile, the coated fabric exhibits excellent flame-retardant properties, with an oxygen limiting index (LOI) of 39.5% and a char length of 8.5 cm in vertical flame test. This multi-functional coating may find wide applications in functional textiles, water recovery, and flame-retardant field.
研究领域:
功能纺织品
·
表面工程
·
阻燃材料
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油水分离
·
材料科学
✓ 已验证
DOI
高影响因子
Frontiers in Bioengineering and Biotechnology
·
2023
·
IF 5.7
Ding Wenbin,Zhou Qirong,Lu Yifeng,Wei Qiang,Tang Hao,Zhang Donghua,Liu Zhixiao,Wang Guangchao,Wu Dajiang
Stem cell-based therapy has drawn attention as an alternative option for promoting prosthetic osteointegration in osteoporosis by virtue of its unique characteristics. However, estrogen deficiency is the main mechanism of postmenopausal osteoporosis. Estrogen, as an effective antioxidant, deficienncy also results in the accumulation of reactive oxygen species (ROS) in the body, affecting the osteogenic differentiation of stem cells and the bone formation i osteoporosis. In this study, we prepared a ROS-scavenging hydrogel by crosslinking of epigallocatechin-3-gallate (EGCG), 3-acrylamido phenylboronic acid (APBA) and acrylamide. The engineered hydrogel can scavenge ROS efficiently, enabling it to be a cell carrier of bone marrow-derived mesenchymal stem cells (BMSCs) to protect delivered cells from ROS-mediated death and osteogenesis inhibition, favorably enhancing the tissue repair potential of stem cells. Further in vivo investigations seriously demonstrated that this ROS-scavenging hydrogel encapsulated with BMSCs can prominently promote osteointegration of 3D printed microporous titanium alloy prosthesis in osteoporosis, including scavenging accumulated ROS, inducing macrophages to polarize toward M2 phenotype, suppressing inflammatory cytokines expression, and improving osteogenesis related markers (e.g., ALP, Runx-2, COL-1, BSP, OCN, and OPN). This work provides a novel strategy for conquering the challenge of transplanted stem cells cannot fully function in the impaired microenvironment, and enhancing prosthetic osteointegration in osteoporosis.
研究领域:
生物材料
·
组织工程
·
再生医学
·
骨科
·
干细胞生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Tissue Engineering and Regenerative Medicine
·
2023
·
IF 3.6
Ye Yuanjian,Zhong Haobo,Huang Shoubin,Lai Weiqiang,Huang Yizhi,Sun Chunhan,Zhang Yanling,Zheng Shaowei
Background: Implantation of bone marrow mesenchymal stem cells (BMSCs) is a potential alternative for promoting bone defects healing or osseointegration in osteoporosis. However, the reactive oxygen species (ROS) accumulated and excessive inflammation in the osteoporotic microenvironment could weaken the self-replication and multi-directional differentiation of transplanted BMSCs. Methods: In this study, to improve the hostile microenvironment in osteoporosis, Poloxamer 407 and hyaluronic acid (HA) was crosslinked to synthetize a thermos-responsive and injectable hydrogel to load MnO 2 nanoparticles as a protective carrier (MnO 2 @Pol/HA hydrogel) for delivering BMSCs. Results: The resulting MnO 2 @Pol/HA hydrogel processed excellent biocompatibility and durable retention time, and can eliminate accumulated ROS effectively, thereby protecting BMSCs from ROS-mediated inhibition of cell viability, including survival, proliferation, and osteogenic differentiation. In osteoporotic bone defects, implanting of this BMSCs incorporated MnO 2 @Pol/HA hydrogel significantly eliminated ROS level in bone marrow and bone tissue, induced macrophages polarization from M1 to M2 phenotype, decreased the expression of pro-inflammatory cytokines (e.g . , TNF-α, IL-1β, and IL-6) and osteogenic related factors (e.g., TGF-β and PDGF). Conclusion: This hydrogel-based BMSCs protected delivery strategy indicated better bone repair effect than BMSCs delivering or MnO 2 @Pol/HA hydrogel implantation singly, which providing a potential alternative strategy for enhancing osteoporotic bone defects healing.
研究领域:
生物医学工程
·
组织工程
·
再生医学
·
纳米技术
·
骨科
·
干细胞研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Acta Biomaterialia
·
2023
·
IF 9.7
Xin Shi,Tong Zhou,Shenyu Huang,Yuejun Yao,Peifang Xu,Shaodan Hu,Chenxi Tu,Wei Yin,Changyou Gao,Juan Ye
s Ocular alkali burn is a serious ophthalmic emergency. Highly penetrative alkalis cause strong inflammatory responses leading to persistent epithelial defects, acute corneal perforation and severe scarring, and thereby persistent pain, loss of vision and cicatricial sequelae. Early and effective anti-inflammation management is vital in reducing the severity of injury. In this study, a double network biomaterial was prepared by compounding electrospinning nanofibres of thioketal-containing polyurethane (PUTK) with a reactive oxygen species (ROS)-scavenging hydrogel (RH) fabricated by crosslinking poly(poly(ethylene glycol) methyl ether methacrylate-co-glycidyl methacrylate) with thioketal diamine and 3,3′-dithiobis(propionohydrazide). The developed PUTK/RH patch exhibited good transparency, high tensile strength and increased hydrophilicity . Most importantly, it demonstrated strong antioxidant activity against H 2 O 2 and 2,2-di(4-tert-octylphenyl)-1-picryl-hydrazyl (DPPH). Next, a rat corneal alkali burn model was established, and the PUTK/RH patch was transplanted on the injured cornea. Reduced inflammatory cell infiltration was revealed by confocal microscopy , and lower expression levels of genes relative to inflammation, vascularization and scarring were identified by qRT-PCR and western blot. Fluorescein sodium dyeing, hematoxylin and eosin (H&E) staining and immunohistochemical staining confirmed that the PUTK/RH patch could accelerate corneal wound healing by inhibiting inflammation, promoting epithelial regeneration and decreasing scar formation. Statement of significance Ocular alkali burn is a serious ophthalmic emergency, characterized with persistent inflammation and irreversible vision loss. Oxidative stress is the main pathological process at the acute inflammatory stage, during which combined use of glucocorticoids and amniotic membrane transplantation is the most widely accepted treatment. In this study, we fabricated a polyurethane electrospun nanofiber membrane functionalized with a ROS-scavenging hydrogel. This composite patch could be a promising amniotic membrane substitute, possessing with a transparent appearance, elasticity and anti-inflammation effect. It could be easily transplanted onto the alkali-burned corneas, resulting in a significant inhibition of stromal inflammation and accelerating the recovery of corneal transparency. The conception of ROS-scavenging wound patch may offer a new way for ocular alkali burn.
研究领域:
眼科学
·
生物材料科学
·
组织工程
·
伤口愈合
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）