Bulletin of Engineering Geology and the Environment
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2024
·Vol. 83
·期 9
·1-16
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IF 3.7
Gao Yuhao,Li Jianzhong,Yang Zhongping,Li Xuyong,Wang Zhitao
The sanitary landfill method remains the primary disposal of municipal waste in developing countries. Effective landfill barriers in intercepting pollutants are warranted to avoid soil and groundwater contamination by leachate leakage from those landfills that threaten human health. This work focuses on enhancing the capability of reticulated red clay barriers to intercept Pb(II) by incorporating activated charcoal and bentonite. The impacts of additives on the hydraulic behavior and Pb(II) blocking efficacy of composite reticulated red clay were explored through hydraulic conductivity and leachate concentration tests, respectively. The microstructural evolution of barrier materials was revealed through scanning electron microscope (SEM) and mercury intrusion porosimetry (MIP) tests. Results suggest that the formulated activated charcoal-bentonite-reticulated red clay composite barrier exhibited significantly better performance than those with the additives individually. The permeability coefficient and Pb(II) leachate concentration of the activated charcoal-bentonite-reticulated red clay barrier with 5% activated charcoal, 16% bentonite, and 79% reticulated red clay were found to be 13.20% and 23.97% of pure reticulated red clay, respectively. The pore size distribution (PSD) curve indicates that the activated charcoal -bentonite-reticulated red clay barrier contains only nanoscale pores. In addition, the activated charcoal and bentonite in the composite barrier form a tortuous network structure that binds the clay aggregates together. This results in more intricate flow paths, enhancing adsorption and ion exchange effects, ultimately reducing hydraulic conductivity and improving the barrier’s ability to intercept contaminants.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Dongya Ma,Shuzhi Yan,Xinru Xue,Miao Niu,Hongliang Li,Deyu Bao,Chao Zhao,Xiujun Li,Peng Wang,Rong Li,Lei Huang,Miao Yu,Sitong Jia,Yanjiao Wang,Xiao Li,Zhen Zhang,Tie Wang
Hydrogen-bonded organic frameworks (HOFs) become promising candidates in the capacitive deionization (CDI) technology due to their prominent redox reaction. Herein, the novel CNTs@HOF-DAT composite with the three-dimensional interwoven-network structure is prepared by the facile solvothermal synthesis and applied to the CDI technology for the first time. The synergistic effect between the special structure of HOF-DAT (multiple hydrogen bonds, abundant heteroatoms and π-π interactions) and the high conductivity of CNTs stimulates more redox active sites for the ion storage and accumulation in the CNTs@HOF-DAT composite. This makes the CNTs@HOF-DAT electrode have a high specific capacitance (152.5 F∙g −1 ) and an improved pseudo-capacitance contribution (49 %). Also, the ion removal capacity (16.33 mg∙g −1 ) of the CNTs@HOF-DAT electrode greatly surpasses that of the single HOF-DAT electrode (3.23 mg∙g −1 ) and CNTs electrode (8.77 mg∙g −1 ). Significantly, the desalination mechanism of the CNTs@HOF-DAT composite electrode is explored in terms of the electrode configurating mode and zero-charge potential of the three prepared electrodes, as well as the redox reaction of the HOF-DAT molecules, which manifests that the CNTs@HOF-DAT electrode is suitable as the cathode of the CDI cell.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Wenhao Peng,Xin Min,Shiping Luo,Aijuan Xie
Transition metal oxides (TMOs) and sulfides (TMSs) have garnered significant attention as promising electrode materials for supercapacitors due to their complementary properties, including high conductivity, abundant active sites, and structural stability. The rational design and facile synthesis of TMO-TMS hybrid materials with unique architectures are critical to achieving high-performance energy storage devices. This study presents a novel CuMn 2 O 4 @CuMn 2 S 4 core-shell nanostructure developed on a nickel foam substrate through hydrothermal and sulfurization processes. The CuMn 2 O 4 core offers robust structural support and high conductivity, while the CuMn 2 S 4 shell enhances electrochemical activity and ion diffusion. The synthesized material, CuMn 2 O 4 @CuMn 2 S 4 NF-2, achieved a specific capacitance of 760.5 F·g −1 at 1.0 A·g −1 , demonstrating superior electron transfer resistance ( R ct =2.06 Ω) and excellent cycling stability, retaining 85.2 % of capacitance after 5000 cycles. Furthermore, an asymmetric supercapacitor (ASC) with CuMn 2 O 4 @CuMn 2 S 4 NF-2 as the positive electrode and activated carbon as the negative electrode delivered a maximum energy density of 35.31 Wh·kg −1 at a power density of 750 W·kg −1 and retained 75.5 % capacitance after 5000 cycles. This study underscores the significant potential of integrating oxide and sulfide materials in a single architecture, offering a promising pathway for designing high-performance energy storage systems that capitalize on the synergistic properties of both material types.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Kai Wang,Wenjun Wang,Yan Wang,Miao Wang
The rapid growth of electric vehicles raises an unmet need to enhance high-temperature performance and safety of Li-ion battery (LIB). Herein, polyethylene glycol/polyvinylidene fluoride (PEG/PVDF) core @ polybutylene succinate (PBS) shell separator with cooling and thermal shutdown functions was fabricated using a one-step coaxial electrospinning method. The separator exhibited superior electrochemical performance even at room temperature due to good wettability and high porosity. When battery temperature rises as discharging, PEG with 50 °C melting point (m.p.) will melt to store heat temporarily. Thus, the separator with cooling function can effectively enhance ion conductivity to alleviate specific capacity drop and polarization voltage increase. As temperature decreases after battery discharging, the separator will release thermal energy to prepare for the next working cycle. When thermal runaway happens and raises temperate above 100 °C rapidly, the PBS shell will melt at 110 °C without skeleton thermal shrinkage. Separator pores can be blocked by the melted PBS and Li + ions transfer can be inhibited in time to prevent disastrous consequence. Thus, dual phase change of the separator provides a novel and effective strategy for synergistic performance and safety enhancement of high temperature LIB.
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FUEL
·
2025
·
IF 7.5
Jie Gao,Zijun Ran,Jingyu Ran,Xin Huang,Chuan Ma,Yunlin Shao
The catalysts utilized for low-temperature catalytic oxidation of Hg 0 from flue gas typically suffer from issues related to H 2 O and SO 2 poisoning. This study focused on doping modification of La 0.875 Ce 0.125 CoO 3 perovskite with promoters and conducted a thorough investigation on the H 2 O and SO 2 resistance through characterization and DFT methods. Experimental results demonstrated that the LCeCO/30 wt% ZrO 2 possessed optimal H 2 O and SO 2 resistance. Under high sulfur (1500 ppm SO 2 ) and high humidity (10 % H 2 O(g)) conditions, it maintained approximately 91 % Hg 0 removal efficiency after thermal regeneration cycles. Characterization results indicated that ZrO 2 doping facilitated the formation of three-dimensional macroporous structure and protected active Co 3+ sites on the surface. Based on DFT calculations, the H 2 O poisoning is attributed to competitive adsorption between H 2 O(g) and Hg 0 on the active sites. Also, the SO 2 poisoning occurs due to competitive adsorption of SO 2 and the toxicity of sulfates to the surface active sites. Meanwhile, ZrO 2 doping can lower the adsorption energies of H 2 O(g) and SO 2 by modifying their adsorption configuration, thus weakening the competitive adsorption of H 2 O(g) and SO 2 with Hg 0 . Overall, LCeCO/ZrO 2 is a promising Hg 0 removal catalyst with superior H 2 O and SO 2 resistance.
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ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Xiaoqi Song,Xiping Lei,Tian Tian,Ting Yu,Hang Zhu,Zewei Zhang,Gengwei Li,Xuanhong Xu,Zhiqiang Wang
Lithium metal anode is broadly regarded as one of the most promising anode materials for batteries due to its extremely high specific capacity, very low redox potential, and mass density. Nevertheless, non-uniform deposition of lithium ions hinder the practical application of lithium metal batteries (LMBs). Herein, it was essential to design a separator with high electrolyte affinity to inhibit the non-uniform deposition of lithium ions. In this work, the wettability and electrolyte uptake of the polypropylene (PP) separator were remarkably improved by introducing reduced graphene oxide (rGO) and polyvinylidene fluoride (PVDF) to the surface of the separator through one-sided coating. The composite separator resulted in lithium ion with high conductivity (1.35 × 10 –3 S cm -1 ) and transfer number (0.63). After assembling the rGO/PVDF@PP separator into the LiFePO 4 ||Li battery and conducting the test, it was found that the specific discharge capacity could still reach 136 mAh g -1 after 100 cycles at 1C. Furthermore, After 1000 h of cycling in the assembled Li‖Li symmetric battery, there is no obvious generation of lithium dendrites on the surface of the lithium metal, indicating the successful suppression of lithium dendrites by the composite separator. This study offers a promising pathway for producing large quantities of new composite separators with high levels of safety.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Kai-Yang Zhang,Han-Hao Liu,Meng-Yuan Su,Jia-Lin Yang,Xiao-Tong Wang,Edison Huixiang Ang,Zhen-Yi Gu,Shuo-Hang Zheng,Yong-Li Heng,Hao-Jie Liang,Yinglin Wang,Shuying Li,Xing-Long Wu
Expanded graphite (EG) stands out as a promising material for the negative electrode in potassium-ion batteries. However, its full potential is hindered by the limited diffusion pathway and storage sites for potassium ions, restricting the improvement of its electrochemical performance. To overcome this challenge, defect engineering emerges as a highly effective strategy to enhance the adsorption and reaction kinetics of potassium ions on electrode materials. This study delves into the specific effectiveness of defects in facilitating potassium storage, exploring the impact of defect-rich structures on dynamic processes. Employing ball milling, we introduce surface defects in EG, uncovering unique effects on its electrochemical behavior. These defects exhibit a remarkable ability to adsorb a significant quantity of potassium ions, facilitating the subsequent intercalation of potassium ions into the graphite structure. Consequently, this process leads to a higher potassium voltage. Furthermore, the generation of a diluted stage compound is more pronounced under high voltage conditions, promoting the progression of multiple stage reactions. Consequently, the EG sample post-ball milling demonstrates a notable capacity of 286.2 mAh g -1 at a current density of 25 mA g −1 , showcasing an outstanding rate capability that surpasses that of pristine EG. This research not only highlights the efficacy of defect engineering in carbon materials but also provides unique insights into the specific manifestations of defects on dynamic processes, contributing to the advancement of potassium-ion battery technology.
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Journal of Energy Storage
·
2024
·
IF 8.9
Yanchen Li,Qi Lu,Jiawei Yang,Weiwei He
Wood is widely used in human life as a natural renewable material. Improving the temperature regulation function of wood is of great significance to reduce the consumption of fossil energy and promote the construction of a low-carbon society. In this study, a phase change energy storage wood (PCES-Wood) with efficient photo-heat conversion efficiency was obtained by impregnating polyethylene glycol based composite material and graphene quantum dot grafted boron nitride (GQDs-BN) as thermal conductive filler . The results show that the thermal stability and the dispersion of GQDs-BN are improved. GQDs-BN shows strong light absorption in both UV and visible segments, and the thermal conductivity exhibited by PCES-Wood reaches 0.3916 W/(m·K) with the GQDs-BN content reaching 6 %. The phase transition temperature of PCES-Wood is between 20.29 °C and 36.29 °C, and the melting and solidification enthalpies reach 114.90 J/g and 113.70 J/g, respectively, reflecting a high latent heat value and a range suitable for human comfort temperature. 6 % GQ-BN-PCES @ Balsa also shows a low leakage rate as only 0.70 % at high temperature. After simulating sunlight exposure, the surface temperature of GQ-BN-PCES @ Balsa increases rapidly and the heat storage capacity is persistent under low-temperature conditions. The PCES-Wood prepared in this study enhances the potential of wood application in the field of temperature regulation.
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Small
·
2024
·Vol. 20
·期 50
·2406489
·
IF 13
Yijun Gao,Shanshan Song,Fei He,Xianglong Kong,Zhong Xiao,Xianchang Cui,Linbo Cao,Yumeng Zhang,Zhiliang Liu,Piaoping Yang
Silicon (Si) has attracted considerable attention as a promising alternative to graphite in lithium-ion batteries (LIBs) because of its high theoretical capacity and voltage. However, the durability and cycling stability of Si-based composites have emerged as major obstacles to their widespread adoption as LIBs anode materials. To tackle these challenges, a hollow core–shell dodecahedra structure of a Si-based composite (HD-Si@C) is developed through a novel double-layer in situ growth approach. This innovative design ensures that the nano-sized Si particles are evenly distributed within a hollow carbon shell, effectively addressing issues like Si fragmentation, volume expansion, and detachment from the carbon layer during cycles. The HD-Si@C composite demonstrates remarkable structural integrity as a LIBs anode, resulting in exceptional electrochemical performance and promising practical applications, as evidenced by tests in pouch-type full cells. Notably, the composite shows outstanding cycling stability, retaining 85% of its initial capacity (713 mAh g −1 ) even after 3000 cycles at a high current rate of 5000 mA g −1 . Additionally, the material achieves a gravimetric energy density of 369 W h kg −1 , showcasing its potential for efficient energy storage solutions. This research signifies a significant step toward realizing the practical utilization of Si-based materials in the next generation of LIBs.
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BIORESOURCE TECHNOLOGY
·
2024
·
IF 9.7
Ishioma Laurene Egun,Bamidele Akinwolemiwa,Bo Yin,Hai Tian,Haiyong He,Kam Loon Fow,Honglei Zhang,George Z. Chen,Di Hu
Biomass-derived carbon for supercapacitors faces the challenge of achieving hierarchical porous carbon with graphitic structure and specific heteroatoms through a single-stage thermal process that minimises resource input. Herein, molten base carbonisation and activation is proposed. The process utilises the inherent moisture of Moso bamboo shoots, coupled with a low amount of KOH, to form potassium organic salts before drying. The resultant potassium salts promote in-situ activation during single-stage heating process, yielding hierarchical porous, large specific surface area, and partially graphitised carbon with heteroatoms (N, O). As an electrode material, this carbon exhibits a specific capacitance of 327F g −1 in 6 M KOH and 182F g −1 in 1 M TEABF 4 /AN, demonstrating excellent cycling stability over 10,000 cycles at 2 A/g. Overall, this study presents a straightforward process that avoids pre-drying of biomass, minimises base consumption, and employs single-stage heating to fabricate electrode carbon suitable for supercapacitors.
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ACS Nano
·
2017
·
IF 13.942
Guodong Zou,Qingrui Zhang,Carlos Fernandez,Gang Huang,Jianyu Huang,Qiuming Peng
Rational design of heterogeneous electrode materials with hierarchical architecture is a potential approach to significantly improve their energy densities. Herein, we report a tailored microwave-assisted synthetic strategy to create heterogeneous hierarchical Ti3SiC2@C-containing Na2Ti7O15 (MAX@C-NTO) composites as potential anode materials for high-performance sodium storage in a wide temperature range from 25 to 80 °C. This composite delivers first reversible capacities of 230 mAh g–1 at 200 mA g–1 and 149 mAh g–1 at 3000 mA g–1 at 25 °C. A high capacity of ∼93 mAh g–1 without any apparent decay even after more than 10 000 cycles is obtained at an ultrahigh current density of 10 000 mA g–1. Moreover, both a high reversible capacity and an ultralong durable stability are achieved below 60 °C for the same composites, wherein a 75.2% capacity retention (∼120 mAh g–1 at 10 000 mA g–1) is achieved after 3000 cycles at 60 °C. To the best of our knowledge, both the sodium storage performances and the temperature tolerances outperform those of all the Ti-based sodium storage materials reported so far. The superior sodium storage performances of the as-synthesized composites are attributed to the heterogeneous core–shell architecture, which not only provides fast kinetics by high pseudocapacitance but also prolongs cycling life by preventing particle agglomeration and facilitates the transportation of electrons and sodium ions by large micro/mesopore structure.
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APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Ruimei Fang,Haibao Huang,Wenjun Huang,Jian Ji,Qiuyu Feng,Yajie Shu,Yujie Zhan,Gaoyuan Liu,Ruijie Xie
Coal based activated carbon (AC) was pretreated by peracetic acid solution and used for supporting Mn catalyst towards oxidation of gaseous benzene by catalytic ozonation . The as-obtained activated carbon was characterized by XPS, BET, SEM, and TG technologies. It indicates that peracetic acid solution modification not only raised the quantity of chemisorbed oxygen or water, and hydroxyl group on activated carbon material surface, but also increased the specific surface area and benzene adsorption capacity of activated carbon. Benzene could be completely removed in 300 min and CO 2 selectivity reached to 61.9% over Mn/AC-modified catalyst. A possible catalytic ozonation mechanism of activated carbon which was treated by peracetic acid solution supported Mn catalyst for oxidation of benzene was proposed.
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