SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Feixiang Gao,Jianwei Bai,Junqing Li,Huijun Yan,Shouzheng Su,Chunhong Zhang,Jun Wang
The development of high-efficiency adsorbents for rapid recovery of uranium from wastewater and seawater is considered an important condition for the sustainable development of nuclear energy. Herein, polyamidoxime (PAO) was introduced into a novel Artemisia sphaerocephala Krasch. gum -polyvinyl alcohol gel system, and ASKG-PVA/PAO gel membrane was prepared by crosslinking and membrane laying. Due to the high swelling capacity of ASKG, PAO chain is fully exposed, and ASKG-PVA/PAO membrane shows excellent uranium adsorption capacity of 681.20 mg·g −1 (pH = 6). The introduction of ASKG greatly improve the adsorption rate of the membrane, and the adsorption process reach equilibrium within 60 min (1/6 of original material). The static adsorption process conforms to the second-order kinetics and Langmuir model. X-ray photoelectron spectroscopy analysis shows that the strong coordination of N and O in amidoxime group is the main reason for uranium adsorption. ASKG-PVA/PAO membrane has great potential as uranium adsorbent due to its fast and efficient adsorption, easy separation and good recycling performance.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 10
·6346-6355
·
IF 3.9
Lina Wu,Huiping Wang,Xiangqian Kong,Haibo Wei,Sheng Chen,Lisheng Chi
Effective removal of strontium isotopes in radioactive waste streams has important implications for the environment and the sustainable development of nuclear energy. In this work, a zirconium phosphate/18-crown-ether-6 (ZrP/18C6) composite was prepared using the intercalation method by loading crown ether into zirconium phosphate. The composite was structurally and morphologically characterized by XRD, FT-IR, XPS, and SEM. The adsorption experiments of Sr2+ onto the ZrP/18C6 composite were conducted as a function of temperature, pH, Sr2+ concentration and competing ions. The results indicate ZrP/18C6 can adsorb 98.6% of Sr2+ within 30 minutes at an Sr2+ concentration of 100 mg L−1 and maintain a high removal rate with a distribution coefficient of 7 × 105 mL g−1 when Sr2+ is at a low level of 4.28 mg L−1. The ZrP/18C6 composite reached a maximum adsorption capacity of 195.74 mg g−1 at an Sr2+ concentration of 380 mg L−1, which is significantly higher than the 43.03 mg g−1 of α-ZrP. The adsorption performance of Sr2+ onto ZrP/18C6 is not significantly affected by temperature, pH and competing ions. Furthermore, the adsorption kinetics and thermodynamics were analyzed based on the adsorption data obtained in the present work. It is shown that the adsorption of Sr2+ onto ZrP/18C6 follows the pseudo-second-order model and the Langmuir monolayer model, respectively. Additionally, the adsorption mechanism of Sr2+ by ZrP/18C6 is discussed.
研究领域:
环境科学
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核化学
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材料科学
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产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Qiang Zhang,Zhenghua Qian,Xueyang Liu,Lin Li,Xilei Duan,Ting Yu,Xiaofeng Liu,Yanbo Qiao
In addition to uranium, thorium is a vital nuclear element that has broad potential for future nuclear energy applications. Herein, we report the synthesis of cubic structured ThO2 nanocrystals (NCs) based on the decomposition of their nitrate salt in air and in a molten salt medium. Both the processes yield pure ThO2 NCs with average sizes of <100 nm. The ThO2 NCs synthesized in the molten salt medium exhibit better crystallinity and a larger average size of ∼75.1 nm with a narrow size distribution owing to the high-temperature liquid growth environment. The ceramic sintered from the salt-derived ThO2 NCs exhibits a considerably higher relative density of 94.6% and similar thermal properties compared with the ceramic fabricated from fine nanopowders (<10 nm) obtained from direct thermolysis of metal nitrate. This study shows that thermal decomposition in a molten salt medium could be an efficient method for producing highly crystalline metal-oxide NCs of thorium-based fuels used in nuclear energy applications.
研究领域:
材料科学
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核能工程
·
化学合成
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DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2024
·
IF 1.8
Meihan Ren,Xiao You,Mengli Xiao,Han Luo,Yudong Xue,Chunjing Liao,Haijun Zhou,Jinshan Yang,Xiangyu Zhang,Shaoming Dong
The reliable jointing of SiC f /SiC is considered to be a key factor limiting the application in the field of nuclear cladding. In this work, a jointing layer with interconnected SiC nanowires (SiCNWs) toughening network is prepared by a typical two-step routine. The high-viscosity slurry containing the precursor is pyrolyzed to form a porous SiC-based jointing layer, which is then densified by chemical vapor infiltration. Besides, SiC powders are introduced into the slurry to further increase the density of the jointing layer. The homogeneous SiC jointing material enables the strength and effectively avoids the mismatch between the thermal expansion coefficient of the jointing layer and SiC f /SiC composites, and the apparent shear strength of the jointing specimen reaches 7.211 MPa. It is found that the joint with SiCNWs shows better shear strength than the joint without SiCNWs, and the improved mechanical properties could be attributed to the pull-out and bridging of SiCNWs.
研究领域:
材料科学
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核工程
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Juncheng Ma,Shuangping Xu,Xintian Wang,Mingyu Zhang,Yanqing Qu,Qiping Cao,Hongge Jia,Jingyu Xu,Xing Wang
The efficient adsorption and storage of radioactive iodine from uranium fission reactions is essential for safe nuclear energy. Bio-based adsorption materials have gained significant attention in the field of radioactive contaminants removal. This is primarily due to their numerous advantages, including a wide range of raw material sources, low cost, ease of preparation, low toxicity, high removal efficiency and stable storage. In this study, rape pollen was chosen as sources of biomass porous carbon, which possesses a micron-sized ellipsoidal shape, homogeneous size, porous structure with sparsely linked network inside, and high carbon content. A biomass derived porous carbon (K-RPC) was synthesized by pretreatment, heat treatment, and advanced treatment techniques. The results indicate that the K-RPC exhibited a hierarchical porous structure with homogeneous and wormhole-like micro- or nanopores, and high specific surface area. The K-RPC demonstrates exceptional iodine capture performance, the capacity surpasses that of most bio-based adsorbents. Remarkably, the maximum adsorption capacity of iodine vapor is approximately fifteen times higher than that of commercial silver exchanged zeolite. The adsorption mechanism, primarily characterized by chemisorption. This study is the first attempt to apply pollen in the field of iodine capture, and the biomass porous carbon extracted from rape pollen has the potential to be a cost-effective iodine adsorption material.
研究领域:
材料科学
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环境科学
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核技术
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生物学
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·Vol. 49
·期 9
·3536-3544
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IF 2.5
Yang Shen,Jingbo Zhang,Yue Wang,Xuemei Li
The development of covalent organic polymers (COPs) to remove iodine in vapor and from solutions is highly desirable for the sustainable production of nuclear energy. Herein, we reported the successful synthesis of an ionic COP (iCOP) via a post-synthesis functionalization approach. Subsequently, a magnetically responsive iCOP (IMF-COP-Fe) was obtained using a simple double-solvent reduction method to facilitate separation. It is noteworthy that IMF-COP-Fe could rapidly achieve solid–liquid separation under the influence of an external magnetic field, with a magnetic recovery rate of 91.89%. The rational design endowed IMF-COP-Fe with affinity sites for removal of iodine in vapor and from solutions. Experimental findings demonstrated that the adsorption capacity of IMF-COP-Fe towards iodine vapor was 2.46 g g−1 at 75 °C. Concurrently, the iodine removal rate of IMF-COP-Fe in 700 mg L−1 iodine–cyclohexane solution reached 80.56%. Even after four adsorption–desorption experiments, it still maintained good adsorption performance. Furthermore, the maximum adsorption capacity of IMF-COP-Fe for iodide ions was found to be 109.9 mg g−1. The present study proposes original concepts for the rational molecular design of materials for simultaneous removal of various forms of radioactive iodine.
研究领域:
材料科学
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环境科学
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核技术
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2020
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IF 5.162
Jia Li,Yuankun Wang,Zhifeng Wang,Jun Wang,Defeng Wu
Chitin nanocrystal (ChNC) is good nucleation agent for aliphatic polyesters because of its high-energy surface. To moderate its nucleation activity, silane coupling agents with different chain lengths or functional groups were used to modify ChNCs in this work, and biodegradable poly( β -hydroxybutyrate) (PHB) was used as target polymer for crystallization study. Surface coupling of ChNCs improves their phase adhesion to PHB chain and weakens their nucleation activities. The alterations strongly depend on the surface chain structure of ChNCs: sulfhydryl silane-coupled ChNC shows lowered nucleation activity, whereas amino silane-coupled ChNCs even become antinucleation agents. The interfacial compatibility is vital to altered role of ChNCs and to following changes in spherulite growth and ring-banded morphology, which is further disclosed using Flory-Huggins interaction parameters and rheological responses as probes. This work provides useful information on tailoring the functions of ChNCs as nanoadditive for biodegradable aliphatic polyesters by the way of surface chain engineering.
研究领域:
材料科学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2023
·Vol. 148
·期 6
·2401-2415
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IF 4.4
Gao Wei,Li Yufeng,Zhao Jitao,Tang Weiwei,Zhang Zhe,Wang Jun,Wu Zhenyu,Li Minggang
The low crystallization rate and long molding time of poly(ethylene terephthalate) (PET) restricts its application in the field of engineering plastics. PET/graphene oxide (GO) composites were synthesized through in situ polymerization method with dimethyl terephthalate (DMT), ethylene glycol (EG) as reactants and GO as filler in order to overcome the above shortcomings. Influence of GO on the crystallization performance of PET was investigated. It was revealed GO raised the crystallization temperature and crystallization rate of PET, demonstrating the excellent nucleation capability of GO. The mechanism of PET nucleation induced by GO was investigated by Avrami equation and Hoffman-Lauritzen theory. It was obvious the crystallization behavior of PET was improved by reducing the free energy of nucleation and the fold surface free energy of PET caused by GO. Moreover, the non-isothermal kinetics of thermal decomposition of PET and PET/GO composites were studied by Friedman method. It was obvious that all of PET and PET/GO composites exhibited a fine thermal stability with no significant mass loss observed up to 370 °C (< 0.5%). The addition of GO improved the thermal stability of PET through raising the apparent activation energy, inhibiting the escape of volatile products and absorbing the degradation products in PET thermal decomposition procedure.
研究领域:
材料科学
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高分子化学
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产品关联
DOI
高影响因子
CHEMOSPHERE
·
2024
·
IF 8.1
Yazhou Wang,Xudong Wu,Xiyang Liu,Chengkun Cai,Chenghu Liang,Lichun Dai,Xinsheng He,Rong He,Huanhuan Liu,Wenkun Zhu
Nuclear energy is playing an increasingly important role on the earth, but the nuclear plants leaves a legacy of radioactive waste pollution, especially uranium-containing pollution. Straw biochar with wide sources, large output, low cost, and easy availability, has emerged as a promising material for uranium extraction from radioactive wastewater, but the natural biomass with suboptimal structure and low content of functional groups limits the efficiency. In this work, microbial etch was first came up to regulate the biochar's structure and function. The surface of the biochar becomes rougher and more microporous, and the mineral contents (Ca, P) indirectly increased by microbial etch. The biochar was modified by calcium phosphate and exhibited a remarkable uranium extraction capacity of 590.8 mg g − 1 (fitted value). This work provides a cost-effective and sustainable method for preparing functionalized biochar via microbial etch, which has potential for application to uranium extraction from radioactive wastewater.
研究领域:
环境科学
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材料科学
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核工程
·
生物技术
·
化学工程
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 10
·49966
·
IF 2.52
Yue Yin,Bo Jiang,Linghui Meng
In order to solve the poor nucleation ability and slow crystallization rate of polyethylene terephthalate (PET), we propose a new strategy to prepare PET with self-nucleation ability based on the mechanism of mutual attraction of ions. In this study, a hydroxyl-terminated sulfonate monomer, sulfonated 1,4-butanediol (SBDO) without rigid structure was synthesized as nucleating agent functionalized PET third monomer, and then PET ionomers (PETi) were prepared through melt polycondensation with different contents of SBDO. The half-crystallization time of PETi was sharply decreased in contrast with pure PET and the crystallization temperature was significantly increased from 182.6°C to 210.8°C for PETi1. Due to the high nucleation efficiency of SBDO, the crystallization temperature of PET was significantly increased, avoiding the excessive addition of traditional nucleating agents to deteriorate the mechanical properties of PET. The increased nucleation efficiency was contributed to the aggregation of SBDO induced by the ionic interactions.
研究领域:
高分子化学
·
材料科学
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Lijun Guo,Liangqiong Peng,Jiheng Li,Wenhua Zhang,Bi Shi
The simultaneous removal and selective separation of U(VI) and Th(IV) via adsorption remain challenging due to their strong mobility, reactivity, and similar chemical properties. Thus, a surface-functioned lignin nanoparticle (AL-PEI) was synthesized to adsorb U(VI)/Th(IV) in a unitary system via a pH-dependent process. In alkaline solution, AL-PEI exhibited excellent adsorption performance, and the maximum adsorption capacities for U(VI) and Th(IV) reached 392 and 396 mg/g, respectively. Discrepantly in acidic solution, the adsorption performance of AL-PEI for U(VI) could still reach a high capacity (332 mg/g), whereas highly limited adsorption capacity (less than 40 mg/g) for Th(IV) was obtained, and the separation factor of U(VI) from U(VI)-Th(IV) matrix significantly reached 6662 in 3 M of the HNO 3 medium. The simultaneously efficient adsorption in alkaline solution and highly selective separation performance in acidic solution of AL-PEI also showed excellent anti-ions interference capacities, high reusability, and strong stability. This study is the first to apply lignin fabricating radiation-resistant adsorbent material, and the adsorbent displays good performance for U(VI)/Th(IV) removal and selective separation via a novel pH-dependent process, which is important to the green and sustainable development of nuclear energy and environmental protection.
研究领域:
环境科学
·
核工程
·
材料科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Man Wang,Lijuan Feng,Guangsheng Luo,Tiantian Feng,Shilei Zhao,Hui Wang,Se Shi,Tao Liu,Qiongyao Fu,Jingquan Li,Ning Wang,Yihui Yuan
The highly effective utilization of uranium resources in global seawater is a viable method to satisfy the rising demands for fueling nuclear energy industry. Herein, inspired by the multi-mechanisms of the marine bacteria for uranium immobilization, CdS nanoparticles are deposited on the cell of marine bacterial strain Bacillus velezensis UUS-1 to create a photosensitized biohybrid system UUS-1/CdS. This system achieves high uranium extraction efficiency using a cascaded strategy, where the bacterial cells guarantee high extraction selectivity and the photosensitive CdS nanoparticles realize cascading photoreduction of high soluble U(VI) to low soluble U(IV) to enhance extraction capacity. As one of the fastest-acting adsorbents in natural seawater, a high extraction capacity for uranium of 7.03 mg g −1 is achieved with an ultrafast extraction speed of 4.69 mg g −1 d −1 . The cascaded strategy promisingly improves uranium extraction performance and pioneers a new direction for the design of adsorbents to extract uranium from seawater.
研究领域:
环境科学
·
材料科学
·
核工程
·
生物技术
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）