JOURNAL OF SOLID STATE CHEMISTRY
·
2020
·
IF 2.726
Guilin Wei,Xiaoyan Shu,Zhentao Zhang,Qingyuan Li,Yi Liu,Xiao Wang,Yi Xie,Bingsheng Li,Dadong Shao,Xirui Lu
The treatment of radioactive iodine waste is a difficulty in the field of nuclear waste disposal. In this work, the B 2 O 3 –Bi 2 O 3 –ZnO based materials with 50 mol% of B 2 O 3 is chosen to immobilize silver-coated silica gel with different iodine loadings at 500, 550, and 600 °C. The results show that the highest amorphous fraction is gotten as 0.88 for the sample with 20 wt % of iodine in silver-coated silica gel sintered at 600 °C. In addition, both of the amorphous fraction and density increase with increasing temperature. The SEM-EDS result indicates that part of iodine is fixed into the glassy phase and other AgI grains are physically wrapped by the vitrified bulk. Our findings demonstrate the feasibility of B 2 O 3 –Bi 2 O 3 –ZnO based materials for the immobilization of silver-coated silica gel with different iodine loadings.
研究领域:
核废料处理
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材料科学
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放射性废物管理
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DOI
高影响因子
FIBERS AND POLYMERS
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2021
·Vol. 22
·期 9
·2440-2446
·
IF 2.153
Ju Lin-Xin,Li Fan,Ning Xin,He Hong-Wei,Zhou Rong
As a natural cellulose fiber, kapok fiber is much easier to degrade due to its thin wall structure of fiber in the process of storage and use. In this work, a finishing modification was designed and developed to prevent kapok fiber from degradation. Dopamine was polymerized in situ and deposited on the surface of kapok fiber, which was operated in the mixed solvents of ethanol:water (1:1 in volume) to overcome the strong buoyancy. Polyethyleneimine (PEI) was introduced to assist dopamine polymerization and improve the load rate. An optimum dosage, 1.0 g/ l of PEI could afford the highest loading rate of 32.1% of polydopamine (PDA), and remarkably improve loading fastness. As a multi-amino polymer, PEI could reduce Ag + and chelate with metal silver (Ag). The PDA/Ag covered kapok fiber and nonwovens showed good antibacterial activity and better mechanic strength, which would be more suitable for durable oil absorption and sound absorption materials than pure kapok fiber.
研究领域:
材料科学
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纺织工程
·
生物学
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DOI
高影响因子
Journal of Cleaner Production
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2021
·
IF 9.297
Ruobing Zhang,Yimin Zhang,Tao Liu,Qian Wan,Dalong Zheng
In recent years, the use of spent fluid catalytic cracking (SFCC) catalysts to prepare geopolymers has received attention from academic and industrial circles. However, SFCC catalysts have been classified as hazardous waste in China due to their vanadium and nickel content. In this paper, the immobilization rates of vanadium and nickel in geopolymers prepared with SFCC catalysts were studied through a toxicity characteristic leaching procedure (TCLP). The immobilization mechanism of nickel and vanadium during geopolymerization was investigated by XPS, SEM, XRD , and compressive strength measurements. The nickel and vanadium TCLP concentrations of the SFCC catalyst-based geopolymer are 0.032 mg/L and 10.63 mg/L, respectively. Nickel in the SFCC catalyst is partly dissolved and adsorbed by the negatively charged tetrahedral aluminum in the geopolymer. However, because vanadates formed under alkaline conditions are negatively charged and readily soluble in water, vanadium in the SFCC catalyst is neither immobilized by the charge balance nor effectively immobilized by physical encapsulation. Therefore, the use of SFCC catalysts to prepare geopolymers will lead to vanadium contamination in the environment. In order to clarify the maximum vanadium content in SFCC catalysts for preparing geopolymers without environmental risk, SFCC catalysts with different vanadium levels were prepared by leaching. It was concluded that when the vanadium content in the SFCC catalyst is lower than 1861.4 mg/kg, the vanadium content in the leachate is lower than 2 mg/L and the geopolymer can be considered a non-hazardous material.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 34
·18477-18487
·
IF 12.732
Menghua Yang,Xuewei Wang,Jinfeng Wu,Yue Tian,Xingyu Huang,Ping Liu,Xianyang Li,Xinru Li,Xiaoyan Liu,Hexing Li
Lithium sulfur (Li–S) batteries have been investigated as ideal candidates for future high-density energy storage systems with the advantages of abundant reserves, high energy density and competitive cost. The key issues are the severe shuttling of polysulfides and sluggish redox kinetics. Herein, we report a novel metal–organic framework-derived Co2P–ZnS/ZnS–C nanocomposite constructed from inner Co2P–ZnS and outer ZnS–C heterostructures. Both the experimental results and theoretical calculations demonstrated that these dual electrocatalytic heterostructures enabled strong affinity with polysulfides and facilitated the reaction kinetics. Meanwhile, the hollow carbon polyhedron provided fast electron/ion transfer channels and effectively buffered volume expansion during cycling. As anticipated, a high initial capacity of 1503 mA h g−1 was achieved at 0.2C with Co–Zn/Zn–C/S as a cathode, together with excellent stability after 500 cycles at 1C. Even a high reversible capacity of 540 mA h g−1 was achieved at 1C after 200 cycles under an elevated sulfur loading of 3.65 mg cm−2. This work presents a new strategy for designing dual electrocatalytic hosts for immobilization and conversion of polysulfides, which may offer more opportunities as cathodes in stable Li–S batteries with high energy density.
研究领域:
材料科学
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能源存储技术
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DOI
高影响因子
RADIOCHIMICA ACTA
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2022
·
IF 2.083
Lei Li,Ran Ma,Xuewei Liu,Tao Wen,Bo Wu,Mingtai Sun,Zheng Jiang,Suhua Wang,Xiangke Wang
Inorganic ion-exchange materials show potential application for toxic radioactive ions due to their remarkable high efficiency and selectivity features. Here, two type of carbon-supported titanate (C@TNFs and C@TNFs(H)) nanofibers have been synthesized by a cost-effective in suit growth method. The resulting C@TNFs and C@TNFs(H) microspheres present uniform flower-like morphology and large surface area. The interlayer Na + in the titanate shell provides docking sites for ion-exchange of radioactive ions (U(VI), Ba(II), and Sr(II)). Interestingly, the exceeding theoretical cation-exchange capacities (CECs) are achieved on C@TNFs for U(VI) ∼4.76 meq g −1 and Ba(II) ∼2.65 meq g −1 and C@TNFs(H) for Ba(II) ∼2.53 meq g −1 and Sr(II) ∼2.24 meq g −1 , respectively. The impressive adsorption performance is mainly attributed to the synergistic effects of ion-exchange and surface complexation. More significantly, C@TNFs and C@TNFs(H) maintain high distribution coefficients ( K
d
U ) of >104 mL g −1 over a wider pH range (pH = 3.5–9.0) and high adsorption rate with short equilibrium time within 50 min. Competitive ion-exchange investigation shows a selectivity order of U(VI) > Ba(II) > Sr(II) at individual 10 ppm concentration, pH = 6.0 and T = 298 K. The related spectroscopic studies reveal the intercalative mechanism of radionuclides in the deformed titanate structure, as a result of target ions firmly trapped in the interlayer of C@TNFs and C@TNFs(H). These advantageous features allow the C@TNFs and C@TNFs(H) to be promising candidates for the remediation of toxic radioactive ions polluted water.
研究领域:
材料科学
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环境科学
·
放射化学
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2019
·
IF 7.65
Peng Liao,Binrui Li,Lin Xie,Xiaoao Bai,Han Qiao,Qianqian Li,Biwei Yang,Chongxuan Liu
Engineered nanoparticles-mediated contaminant transport has been recognized as a significant process governing the mobility of metals and radionuclides in groundwater. Engineered silicate nanoparticles (ESNPs) are attractive materials for the sequestration or extraction of Cr(VI) and other metals and radionuclides from groundwater. While great efforts have been devoted toward the application of these materials for Cr(VI) sequestration, the underlying interface adsorption mechanism is not thoroughly elucidated. This study investigates the immobilization mechanisms of Cr(VI) on a representative ESNPs, NH 2 -MCM-41, over a range of water chemistry conditions. By combining batch adsorption experiments with an array of complementary characterizations, we provided spectroscopic and microscopic evidence that the electrostatic interactions between the positively charged NH 2 -MCM-41 surface derived from amino functionality and the negatively charged Cr(VI) species was the dominant mechanism responsible for Cr(VI) immobilization. In addition, the weak hydrogen bonding interactions may also contribute to adsorption to a degree. Furthermore, thermodynamic studies suggested a favorable, spontaneous, and exothermic adsorption process. Site energy analysis illustrated that the distribution of energy binding sites on NH 2 -MCM-41 is Cr(VI) loading dependent. The new insights provided here can advance understanding of the transport of Cr(VI) associated NH 2 -MCM-41 that benefits the application of ESNPs-based technologies for metals immobilization in groundwater.
研究领域:
环境科学
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纳米技术
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污染治理
✓ 已验证
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2014
·
IF 2.538
Zhirong Xin,Shunjie Yan,Jiaotong Ding,Zongfeng Yang,Binbin Du,Shanshan Du
Amphiphilic N-alkyl-1-amino-1-deoxy- D -glucitol (C n AG, n = 8, 12) were successfully prepared. Polypropylene nonwoven fabrics (PP NWF ) were grafted with glycidyl methacrylate (GMA) via a technique of UV-induced graft polymerization combined with plasma pre-treatment, and then PP NWF -g-GMA was used for the covalent immobilization of C n AG. The surface graft polymerization was confirmed by ATR-FTIR and XPS, respectively. Effect of grafting parameters, e.g., acetone content, monomer concentration and UV irradiation time on the grafting density of GMA was investigated. And the hemocompatibility of the modified PP NWF was evaluated by protein adsorption and platelet adhesion. It was founded that the C n AG-modified substrates greatly suppressed protein adsorption and platelet adhesion compared with the native and pGMA-grafted PP NWF .
研究领域:
材料科学
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高分子化学
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生物医学工程
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DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2018
·Vol. 20
·期 3
·1-11
·
IF 2.127
Han Congcong,Yang Jian,Gu Jinlou
Silver nanoparticles (AgNPs) are a potential class of nanomaterial for antibiosis and chemotherapeutic effects against human carcinoma cells. However, the DNA-damaging ability of free AgNPs pose the critical issues in their biomedical applications. Herein, we demonstrated a facile method to capture Ag + ions and reduce them into active AgNPs within Zr-based metal-organic frameworks (MOFs) of UiO-66 with a mild reductant of DMF (AgNPs@UiO-66(DMF)). The average diameters of UiO-66 carriers and AgNPs were facilely controlled to be 140 and 10 nm, respectively. The obtained UiO-66 nanocarriers exhibited excellent biocompatibility and could be effectively endocytosed by cancer cells. Additionally, the AgNPs@UiO-66(DMF) could rapidly release Ag + ions and efficiently inhibit the growth of cancer cells. The half maximal inhibitory concentration (IC 50 ) values of the encapsulated AgNPs were calculated to be 2.7 and 2.45 μg mL −1 for SMMC-7721 and HeLa cells, respectively, which were much lower than those of free AgNPs in the reported works. Therefore, the developed AgNPs@UiO-66(DMF) not only maintained the therapeutic effect against cancer cells but also reduced the dosage of free AgNPs in chemotherapy treatment.
A mild reduction process was developed for the fabrication of AgNPs@UiO-66, which exhibited efficient induction of apoptosis in cancer cells.
研究领域:
纳米技术
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癌症研究
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材料科学
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生物医学工程
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DOI
高影响因子
Frontiers in Bioengineering and Biotechnology
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2022
·
IF 6.064
Huang Jianhao,Lu Jingwei,Liu Ziying,Jin Jing,Xie Chunmei,Zheng Yang,Wang Zhen,Yu Lingfeng,Zhu Yan,Fan Gentao,Sun Guojing,Xu Zhihong,Zhou Guangxin
Objective: Promoting bone regeneration and repairing in bone defects is of great significance in clinical work. Using a simple and effective surface treatment method to enhance the osteogenic ability of existing bone scaffold is a promising method. In this article, we study the application of catecholic amino acid 3,4-dihydroxyphenylalanine (DOPA) surface coating chelated with vascular endothelial growth factor (VEGF) on allogeneic bone.Method: Allogeneic bone is immersed in DOPA solution and DOPA form polydopamine (PDA) with good adhesion. Electron microscopy is used to characterize the surface characteristics of allogeneic bone. MC3T3-E1 cells were tested for biocompatibility and osteogenic signal expression. Finally, a 12-week rabbit bone defect model was established to evaluate bone regeneration capability.Results: We found that the surface microenvironment of DOPA bonded allogeneic bone was similar to the natural allogeneic bone. VEGF loaded allografts exhibited satisfying biocompatibility and promoted the expression of osteogenic related signals in vitro. The VEGF loaded allografts healed the bone defect after 12 weeks of implantation that continuous and intact bone cortex was observed.Conclusion: The PDA coating is a simple surface modification method and has mild properties and high adhesion. Meanwhile, the PDA coating can act on the surface modification of different materials. This study provides an efficient surface modification method for enhancing bone regeneration by PDA coating, which has a high potential for translational clinical applications.
研究领域:
生物材料
·
组织工程
·
生物医学工程
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DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 11
·8391-8399
·
IF 3.201
Yajie Wang,Qiang Wang,Xiaoping Song,Jingjing Cai
Dextranase is a unique biocatalyst for the enzymatic hydrolysis of dextran in carbohydrate chemistry, but the instability and poor recycling ability of dextranase significantly limit its long-term applications. As an alternative method, stabilization of dextranase on a solid carrier is a promising strategy. In this study, a kind of polyethylenimine (PEI) polymer modified magnetic particle was fabricated and employed as the substrate for covalent immobilization of dextranase (Fe3O4@SiO2-PEI-dextranase) to improve the stability and reusability performance for the first time. The grafted PEI polymer on the surface enhanced the amount of primary amine groups, and improved the loading capacity of dextranase on Fe3O4@SiO2-PEI-dextranase to 217.2 mg g−1, which was 3.84 times that measured on Fe3O4@SiO2-NH2-dextranase particles. Under the optimized conditions, high immobilization efficiency (72.38%) and enzymatic activity (82.84%) of Fe3O4@SiO2-PEI-dextranase were achieved. Thermal and pH tolerance, and long-term storage tests revealed that the Fe3O4@SiO2-PEI-dextranase exhibited much better stabilities. More importantly, Fe3O4@SiO2-PEI-dextranase retained 83.26% of its initial activity after reuse 15 times, suggesting its excellent reusability. It is believed that the immobilized dextranase could have potential applications in biological and biocatalytic fields.
研究领域:
生物化学
·
生物技术
·
酶学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Zeqing Liu,Yuhan Li,Lingmei Dai,Dehua Liu,Wei Du
Single-crystalline ordered macro-microporous CuBTC shows excellent mass transfer performance and has high fatty acid stability, making it highly promising as an enzyme immobilization carrier. However, its practical application is severely limited by its poor water stability. To address this challenge, we introduced a ligand, 1,2,3-benzotriazole (BTA), known for its hydrophobicity and strong coordination with copper. A series of CuBTC-derived dual-ligand SOM-MOFs (SOM-MIXs) was successfully synthesized with enhanced hydrophobicity and improved water stability. The CuBTC-derived SOM-MIXs demonstrated superior performance for lipase immobilization, resulting in a maximum increase of 66.9% in specific activity. To address the limitation that excessive addition of 1,2,3-benzotriazole does not further enhance the hydrophobicity of the carrier and may lead to structural damage, a sol–gel method was employed to coat the SOM-MIX with highly hydrophobic PDMS, leading to a further increase of 139.1% in the specific activity. The resulting immobilized lipase exhibited excellent catalytic performance and remarkable reusability, with 90.09% activity retention after five cycles in the synthesis process of 1-oleoyl-2-palmitoyl-3-linoleoylglycerol (OPL) by acidolysis. This work highlights the potential of SOM-MIX@PDMS and provides valuable insights into the rational design and postmodification of metal–organic frameworks (MOFs) for enzyme immobilization in diverse applications.
研究领域:
生物化学
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材料科学
·
酶工程
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产品关联
DOI
高影响因子
Water
·
2024
·Vol. 16
·期 3
·416
·
IF 3
Qiang Li,Yuehui He,Boyan Wang,Nanhai Weng,Lei Zhang,Kaichun Wang,Fengrong Tian,Mingsheng Lyu,Shujun Wang
The biological denitrification of low-C/N wastewater is a great challenge in treatment plants due to the lack of microorganisms with heterotrophic nitrification–aerobic denitrification (HN-AD) abilities. In this study,Bacillussp. L2 was isolated from aeration tank water samples using a nitrification medium and screened for its ability to perform HN-AD in low-C/N wastewater. The strain showed a maximum NH4+-N removal rate of 98.37% under low-C/N conditions. In the presence of a mixed N source, strain L2 was capable of completely removing NH4+-N within 24 h. Furthermore, optimal nitrogen removal conditions for strain L2 were found to be C/N = 9, pH = 9, and sodium acetate as the C source. Under optimal conditions, the strain was able to maintain a high NH4+-N removal rate under 0–3% salinity and an NH4+-N concentration of 200 mg/L or less. The denitrification pathways of strain L2 were NH4+→NH2OH→NO2−(↔NO3−)→NO→N2O→N2and NH4+→NH2OH→NO→N2O→N2. Furthermore, semi-continuous wastewater treatment was conducted using immobilized technology, which resulted in more than 82% NH4+-N removal after three cycles of reuse. This study demonstrates the great potential ofBacillussp. L2 in wastewater treatment applications.
研究领域:
环境微生物学
·
污水处理
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）