Metals
·
2023
·Vol. 13
·期 4
·677
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IF 2.9
Yuliang Chen,Xiangbiao Yin,Hao Fu,Zheyang Lin,Guangcan Ma,Xinpeng Wang,Qingsong Wang,Fangqiang Chen
Strontium, the main component of radioactive nuclear wastewater, is characterized by a high fission yield and an extended half-life. It is easily absorbed by the human body, thus greatly threatening the environment and the human body. In this study, a mesoporous composite phase sodium superionic conductor (NVP@NMP) was synthesized by the droplet template method, and the rapid capture of Sr2+from wastewater was achieved by constructing a nano-heterogeneous interface to increase the ion diffusion rate. NVP@NMP showed efficient and rapid removal of strontium ions in adsorption kinetics, isothermal adsorption, solution pH, and interfering ions concentration tests, especially using the equilibrium time of 2 min for strontium absorption by NVP@NMP and a maximum theoretical adsorption capacity of 361.36 mg/g. The adsorption process was spontaneous, endothermic, and feasible. At higher concentrations of other competing ions (Na, K, Ca, Mg, and Cs), the adsorbent exhibited higher selectivity towards Sr2+.TEM, XPS, and XRD analyses revealed that ion exchange was the main mechanism for the NVP@NMP ultrafast adsorption of Sr2+. In this research, we investigated the feasibility of ultrafast strontium capture by sodium superionic conductor structured phosphates and explained the ultrafast strontium adsorption mechanism of NASICON materials through XPS.Keywords:NASICON;ultrafast adsorption;strontium;ion exchange;wastewater
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
FUEL
·
2023
·
IF 7.4
Kaiwen Zheng,Qiliang Gao,Chao Li,Guojie Zhang,Qingde Zhang,Junfeng Zhang,Yizhuo Han,Yisheng Tan
The production of high value-added oxygenated chemicals from methanol and its derivatives is one of the important ways of coal conversion and clean and efficient utilization. Herein, a series of environmentally-friendly Cs-modified NASICON materials were applied to catalyze the aldol condensation of acetic acid (HAc) and formaldehyde (FA) to acrylic acid (AA) and methyl acrylate (MA). Encouragingly, the selectivity of target products (AA + MA) was highly up to 92.2%, corresponding to the space–time-yield more than 48.0 μmol·g cat - 1 ·min - 1 over the 2Cs/NSC catalyst, achieving the synchronization of good selectivity and productivity for the target products. Characterization results demonstrated that the acid-base modulation by Cs was responsible for catalyst supremacy. The weak basic sites on catalyst surface were efficient in adsorbing and activating HAc. Plenty of acidic sites especially the medium-strong and strong acidic sites were more favorable for the AA formation.
研究领域:
催化化学
·
煤化工
·
清洁能源
✓ 已验证
产品关联
DOI
高影响因子
Sustainable Energy & Fuels
·
2025
·
IF 4.1
Yitao Hui,Xianhe Meng,Aobo Yue,Qi Shen,Bingyu Liu,Nengjun Yu,Qiaoling Kang,Lijing Yan,Chubin Wan,Tingli Ma
Na superionic conductors (NASICONs) have attracted much attention due to their unique framework structure and high capacity. However, the poor intrinsic electron conductivity severely limits further development. This work develops a soft-hard carbon composite modified Na3V2(PO4)3 (NVP) cathode with excellent rate performance and long-term cycling stability. The optimized sample exhibits excellent electrochemical performance and can release a specific discharge capacity of 102.7 mAh g-1 at 1 C rate. At the same time, after 5000 cycles at 20 C rate, the discharge capacity can reach 82.3 mAh g-1, and the capacity retention rate is 100.1 %. The morphological characteristics of the NVP/C samples were investigated, Meanwhile, combined with Raman spectroscopy and electrochemical analysis, these results revealed that the synergistic interaction between soft and hard carbon components significantly enhances electronic conductivity and facilitates rapid ionic transport. This work provides a unique idea for the surface modification and synthesis of NASICON cathode materials for sodium-ion batteries.
研究领域:
材料科学
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电化学
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能源存储
·
无机固体化学
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纳米材料
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电池技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Binghao Lin,Xu Wu,Xuejie He,Jiaxin Ye,Yuqin Song,Ping Jiang,Linxuan Bai,Xiangyue Liao,Yangjie Li,Yu Huo,Qiaoji Zheng,Heng Zhang,Dunmin Lin
Na 3 V 2 (PO 4 ) 3 (NVP) with typical NASICON structure is highly regarded as one of the most appealing cathodes for sodium-ion batteries (SIBs) for their excellent structural stability; however, the poor electronic conductivity and irreversible phase transition at high voltage (∼4 V) for the material result in poor rate capabilities and significant capacity degradation during electrochemical reactions. Herein, the high-entropy doping strategy of introducing six types of metal ions into the V-sites in Na 3 V 2 (PO 4 ) 3 is used to design a high-performance cathode of Na 3 V 1.73 (Mn, Ca, Mg, Al, Zr) 0.05 Nb 0.02 (PO 4 ) 3 (HE-NVP) for SIBs. After the high-entropy doping, a reversible V 4+ /V 5+ redox pair is activated at high voltage of ∼4 V, which significantly contributes to the enhancement of energy density and operating voltage. Moreover, after high entropy doping, the single solid solution phase transition in high voltage range is induced, effectively improving the material’s structural stability and exhibiting very small volume change of 1.1 % during the Na + extraction/insertion. Based on the unique advantages mentioned above, the high-entropy HE-NVP exhibits a superior discharge capacity of 122.1 mAh g −1 at a current rate of 0.5C and maintains a remarkable capacity retention of 90.1 % after 500 cycles at a rate of 5C. This work provides a useful reference for designing advanced cathodes for SIBs by regulating high entropy doping.
研究领域:
材料科学
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电化学
·
储能技术
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电池技术
✓ 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）