Journal of Water Process Engineering
·
2024
·
IF 6.3
Zhen Ruan,Junzhen Di,Ting Zhang
Acid mine drainage (AMD) contains high levels of harmful heavy metal (HM) ions. To mitigate its harmful effects, this study developed novel Algae-Fungal Immobilized Bioparticles (AFIBs) using Chlorella ellipsoidea HLDA2 and Aspergillus tubingensis HLDF3. By optimizing the culture conditions of the algal-fungal system, the immobilization efficiency of the mycelial pellets formed at pH 3 reached 94.40 %. It was revealed that AFIBs effectively removed Mn(II) and Zn(II) through the mechanisms of electrostatic adsorption, ion exchange, chelation, and chemical precipitation. AFIBs outperformed both single algae and fungal systems within the Mn(II) and Zn(II) concentration range of 1 to 30 mg/L tested. The water quality index ( WQI ) of the treated AMD with AFIBs was 82.82, indicating suitability for aquatic life. In the real AMD treatment, the AFIBs decreased Mn(II) and Zn(II) concentrations to 1.832 mg/L and 1.663 mg/L, respectively, achieving removal rates of 92.97 % and 87.40 %. They also raised the pH to 8.59, adhering to the coal industry pollutant discharge standards (GB20426–2006). Thus, the novel AFIBs developed offer a sustainable solution for AMD remediation.
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Jun Xiao,Mengmeng Wang,Yaru Wang,Xunxun Li,Jiaqin He,Yunchong Liu,Qingfeng Xu,Hua Li,Najun Li,Dongyun Chen,Jianmei Lu
Catalytic oxidation is one of the most promising methods to remove toluene; manganese-cerium catalysts have high activity in the catalytic oxidation of toluene. Herein, nano-sized ZSM-5 was synthesized using a simple hydrothermal method, and catalysts with different Mn and Ce contents were prepared via alcohol-induced redox precipitation at room temperature. In addition, zeolite provides sufficient surface area for the dispersion of manganese cerium catalysts and plays a role in concentration and enrichment in the catalytic conversion of toluene. Based on the experimental characterization results, the 20Ce/M1Z1 catalyst exhibited the best catalytic activity, achieving 90% toluene conversion at 215 °C. Moreover, the catalyst still has excellent catalytic activity in humid environments. This work provides a new strategy to expose more active sites and enhance toluene adsorption, which provides a reference for the development of more efficient catalysts in the future.
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2022
·
IF 9.794
Yixuan Zhang,Guoqiang Liu,Chang Su,Guangyin Liu,Hongda Sun,Danlei Qiao,Lei Wen
This work focuses on the improvement on the electrochemical performances of Fe–Mn based oxides as cathode for sodium ion batteries by doping Cu and F elements. The synthesized doped-compounds exhibit extremely excellent electrochemical performance. For instance, it's initial discharge capacity can reach 195.6 mAh g −1 at a current density of 10 mA g −1 . Meanwhile, after 200 cycles at 200 mA g −1 , it still remains a capacity of 124.1 mAh g −1 , 87.8% of the initial capacity of 141.3 mAh g −1 . More significantly, it can deliver a high capacity of 106.4 mAh g −1 at a high current density of 1000 mA g −1 . It is found that F/Cu co-substitution obviously improve the discharge capacity and cycle stability of Fe–Mn based oxide especially at higher current densities. Doping Cu and F elements has influence on the structure and morphology of the material, which results in the improvement of charge-discharge characteristics.
✓ 已验证
DOI
高影响因子
Nano Energy
·
2018
·
IF 13.12
Guorong Chen,Juan An,Yiming Meng,Changzhou Yuan,Bryan Matthews,Fei Dou,Liyi Shi,Yongfeng Zhou,Pingan Song,Gang Wu,Dengsong Zhang
Cobalt-free Li and Mn-rich layered cathode materials are promising for next generation lithium ion batteries due to their high specific capacity and low cost. However, these materials are facing serious issues, such as structural collapse due to volume shrinkage during Ni 2+ oxidation to Ni 4+ and oxygen vacancy generation over 4.5V. In this work, we report a strategy to address the issue of volume shrinkage caused by structural deformation via constructing a large-size rigid frame by simultaneously doping inactive and large radius atoms of Cd and S. This strategy significantly reduces the volume shrinkage when fully delithiated relative to the pristine material. The Cd- and S-doped cathode materials present a highly reversible structure, which were determined by using HAADF-STEM and in-situ XRD characterization. The doped Cd and S atoms act as supporting atoms and synergistically enlarge the layer spacing of crystalline from 0.455 to 0.483 nm. The in-situ XRD monitors the structural changes in real time during charging and discharging processes, further verifying structural stability during cycling. Due to the unique structural properites, an initial capacity of 268.5 mAh g −1 at 0.1 C along with a good rate capacity of 153.8 mAh g −1 at 5 C were achieved. Also, a capacity of 243.4 mAh g-1 at 0.1 C over 80 cycles indicate good cyclic stability of the co-doped Li- and Mn-rich layered cathode.
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2018
·
IF 0
Tesfaye Tadesse Gebremariam,Fuyi Chen,Qiao Wang,Jiali Wang,Yaxing Liu,Xiaolu Wang,Adnan Qaseem
The exploration and rational design of cost-effective, highly active, and durable catalysts for oxygen electrochemical reaction is crucial to actualize the prospective technologies such as metal–air batteries and fuel cells. Herein manganese cobalt oxide nanoparticles anchored on carbon nanofibers and wrapped in a nitrogen-doped carbon shell (MCO/CNFs@NC) is successfully prepared. Benefiting from the synergistic effect between the core nanoparticles and nitrogen-doped carbon shell, MCO/CNFs@NC catalyst exhibits oxygen reduction reaction (ORR) activity with comparable onset potential (1.00 V vs RHE) and half-wave potential (0.76 V vs RHE) which is only about 40 mV lower than that of the state of art Pt/C catalyst. Furthermore, the MCO/CNFs@NC catalyst exceeds the Pt/C catalyst by a great margin in terms of stability in alkaline media. Additionally, MCO/CNFs@NC catalyst is strongly tolerant to methanol crossover, promising its applicability as cathode catalyst in alcohol fuel cells. Moreover, MCO/CNFs@NC catalyst exhibits the oxygen evolution reaction (OER) activity with low overpotential of 0.41 V at the current density of 10 mA cm–2 and ORR/OER potential gap (ΔE) as low as 0.88 V, suggesting its strong bifunctionality. The Zn–air battery based on MCO/CNFs@NC catalyst is found to deliver a specific capacity of 695 mA h g–1Zn and an energy density of 778 W h kg–1Zn at a current density of 20 mA cm–2. The mechanically rechargeable Zn–air battery based on MCO/CNFs@NC catalyst is also found to function continually by only reloading the consumed Zn anode and electrolyte. Furthermore, the electrically rechargeable battery based on MCO/CNFs@NC catalyst is found to function for more than 220 cycles with negligible loss of voltaic efficiency. Moreover, MCO/CNFs@NC is found to display a supercapacitive nature with a good discharge capacity of 478 F g–1 at a discharge current density of 1 A g–1.
✓ 已验证
DOI
Journal of Physical Chemistry Letters
·
2024
·
IF 4.8
Yanchang Wang,Yao Xiao,Jiangnan Huang,Chunxiao Zhang,Kentaro Yamamoto,Yoshiharu Uchimoto,Weifeng Wei,Hongshuai Hou,Datong Zhang,Xiaobo Ji
For cathode materials of sodium-ion batteries, O3-type Ni/Fe/Mn-based (Na-NFM) layered oxides have garnered extensive attention because of high economic viability, environmental friendliness, and the potential for high energy density. Among them, Fe-rich compositions exhibit higher initial charge capacity and lower bill-of-material costs, while they fade rapidly and exhibit low initial coulombic efficiency, hindering their commercialization prospects. In this work, we investigate the failure of Fe-rich Na-NFM materials through X-ray absorption spectroscopy methods. The results reveal a combined failure mechanism that encompasses not only the conventional theory of Fe migration but also an abnormal Ni-redox deterioration, which has not yet been reported. More factors related to the failure of Fe-rich Na-NFM layered oxides are discussed in detail. These findings are expected to inspire targeted research efforts toward Fe-rich Na-NFM materials, thereby accelerating the practical application of sodium-ion batteries.
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Jie Qu,Dong Wang,Zu-guang Yang,Zhen-guo Wu,Lang Qiu,Xiao-dong Guo,Jun-tao Li,Ben-he Zhong,Xian-chun Chen,Shi-xue Dou
Composite cathodes have attracted great attention due to the integrated advantages of each pure structure. Also, the component ratio deserves a careful modulation to further improve the corresponding electrochemical performance. Mn-based layer–tunnel hybrid composite became a focus in sodium-ion batteries due to the superiority in terms of high performance, low cost, and nontoxicity. In the previous reports, the structure modulation was carried out via changing the synthesis condition, varying the transition-metal-element ratio, and different ion doping. Also, it is still challenging to explore a more feasible method to simplify the adjustment process. Herein, we introduced Mg2+ into Na sites or transition-metal sites in Na0.6MnO2 and first discovered the doping-site-variation-induced structural adjustment phenomenon. Specifically, Mg doping in transition-metal sites could be beneficial for the growth of the P2-type structure, while layer/tunnel component ratio decreased when locating Mg2+ in Na sites. The P2–O2 phase transformations could be effectively suppressed by locating Mg2+ in both sites in high-voltage regions and thus improve the cycling performance. The designed material, Na0.6Mn0.99Mg0.01O2, could attain a decent capacity of 100 mA h g–1 at 1000 mA g–1 and a satisfied retention of 76.6% after 500 cycles. Additionally, ex situ X-ray diffraction analysis experiments verify the excellent structural stability of Mg-substituted samples during charge–discharge processes. Moreover, the Na0.6Mn0.99Mg0.01O2 also displays superior sodium-ion full-cell properties when merged with hard carbon anode. Thus, this research may indicate a proper novel thread for designing high-performance composite electrodes.
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Wenbo Li,Jinyang Dong,Yong Zhao,Jiayu Zhao,Haoyu Wang,Ning Li,Yun Lu,Jianan Hao,Yujia Wu,Youyou Fang,Yali Li,Qiongqiong Qi,Yuefeng Su,Feng Wu,Lai Chen
Li-rich Mn-based (LMR) layered oxides are considered promising cathode materials for high energy–density Li-ion batteries. Nevertheless, challenges such as irreversible oxygen loss at the surface during the initial charge, alteration of the bulk structure, and poor rate performance impede their path to commercialisation. Most modification methods focus on specific layers, making the overall impact of modifications at various depths on the properties of materials unclear. This research presents an approach by using doping to adjust both surface and bulk properties; the materials with surface and bulk fluoride anion doping are synthesised to explore the connection between doping depth, structural and electrochemical stability. The surface-doped material significantly improves the initial Coulombic efficiency (ICE) from 77.85% to 85.12% and limits phase transitions, yet it does not enhance rate performance. Conversely, doping in bulk stands out by improving both rate performance and cyclic stability: it increases the specific discharge capacity by around 60 mAh g −1 and enhances capacity retention from 57.69% to 82.26% after 300 cycles at 5C. These results highlight a notable dependence of material properties on depth, providing essential insights into the mechanisms of surface and bulk modifications.
✓ 已验证
DOI
高影响因子
Small
·
2025
·Vol. 21
·期 19
·2411490
·
IF 12.1
Yujia Zhang,Fuliang Guo,Ao Li,Zhixiong Li,Pengcheng Yuan,Jing Xu,Zhiwei Hu,Liang Yin,Huiling Zhao,Ying Bai,Hong Li
Heteroatoms doping would validly stabilize the structure of Li-rich material and elevate electrochemical performance. For the synthesized Li-rich material, the conventional ex situ doping strategy can only incorporate heteroatoms in the outer particles, diminishing benefits for the internal structure of secondary particles. Recently, in situ doping has been employed to influence topological lithiation and achieve well-distribution in the bulk structure. However, the mechanisms of in/ex situ doping on elevating electrochemical performance for Li-rich material are ambiguous. Herein, by introducing magnesium (Mg 2+ ) ions on the precursor and synthesized Li-rich material, the in situ Mg doping (LRO-Mg1) and the ex situ Mg doping (LRO-Mg2) samples are successfully designed. Characterizations shows that Mg ion tend to incorporate into the Li-rich bulk structure for in situ doping, while they enrich in the surface for ex situ doping. Electrochemical measurement manifest that the in situ Mg doping Li-rich cathode exhibits more elevated high-rate performance, while the ex situ doping Li-rich cathode exhibits more elevated specific capacity, illuminating that enhances bulk structure of Li-rich cathode through in situ doping strategy is more effective than the surface modification (ex situ doping). Ex situ doping may be more effective for surface treatment, contributing to specific capacity improvement.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Yangeng Peng,Xianzhao Zhang,Fengmao Liu,Dawei Zhen,Yanyan Jiao,Qingrong Peng
This work developed a novel Mn/N co-doped biochar (Mn/N-BC) using 1-methyl-3-methylimidazolium tetrachloromanganate ([Emim] 2 [MnCl 4 ]) as a modifier. The modification process increased the specific surface area (SSA) by 2.4 times and pore volume by 1.8 times, while simultaneously doping the biochar matrix with Mn and N, which provided additional adsorption sites and enhanced chemical reactivity. Adsorption experiments were conducted following pseudo-second-order kinetics and Langmuir isotherms, revealing a monolayer adsorption behavior. The maximum adsorption capacity of Mn/N-BC-3 for tetracycline (TC) was 2.8 times higher than that of unmodified biochar. Thermodynamic analysis indicated that the adsorption process was both spontaneous and endothermic. The adsorption mechanism involved multiple interactions, including pore-filling, hydrogen bonding, and π-π interactions. Density functional theory (DFT) calculations revealed that Mn and N doping significantly reduced the energy gap and increased adsorption energy, enabling stronger electronic interactions and enhancing the material’s affinity for TC. Regeneration experiments demonstrated that Mn/N-BC-3 retained 86 % of its initial TC adsorption capacity after five cycles, and leaching tests showed minimal Mn leaching. The material also exhibited excellent performance in real water, with a minimal reduction in TC adsorption in tap and river water. Furthermore, Mn/N-BC-3 showed effective adsorption of five different antibiotics. This study demonstrates that Mn/N-BC holds significant potential as an effective adsorbent for TC removal and demonstrates the versatility of metal ionic liquids in biochar modification. The findings provide valuable insights into developing advanced adsorbents for environmental remediation.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Xueqian Ji,Yuxing Xu,Hailan Feng,Pengfei Wang,Yuncheng Zhou,Jiechen Song,Qing Xia,Qiangqiang Tan
To improve the initial Coulombic efficiency, cycling stability, and rate performance of the Li-rich Mn-based Li1.2Mn0.54Ni0.13Co0.13O2 cathode, the combination of LiMn1.4Ni0.5Mo0.1O4 coating with Mo doping has been successfully carried out by the sol–gel method and subsequent dip-dry process. This strategy buffers the electrodes from the corrosion of electrolyte and enhances the lattice parameter, which could inhibit the oxygen release and maintain the structural stability, thus improving the cycle stability and rate capability. After LiMn1.4Ni0.5Mo0.1O4 modification, the initial discharge capacity reaches 272.4 mAh g–1 with a corresponding initial Coulombic efficiency (ICE) of 84.2% at 0.1C (1C = 250 mAh g–1), far higher than those (221.5 mAh g–1 and 68.9%) of the pristine sample. Besides, the capacity retention of the coated sample is enhanced by up to 66.8% after 200 cycles at 0.1C. Especially, the rate capability of the coated sample is 95.2 mAh g–1 at 5C. XRD, SEM, TEM, XPS, and Raman spectroscopy are adopted to characterize the morphologies and structures of the samples. This coating strategy has been demonstrated to be an effective approach to construct high-performance energy storage devices.
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF COORDINATION CHEMISTRY
·
2021
·
IF 1.751
Le Guo,Yan-Peng Gao,Yan-Hua Lv,Li Wang,Yu Han,Fei Chang
We report the synthesis, crystal structures, and magnetic properties of a series of two-dimensional (2-D) and three-dimensional (3-D) coordination polymers (CPs). A solvothermal reaction of manganese metal salts with 4,4′-oxydibenzoic acid (H2oba), 4,4′-methylenebis(oxy) dibenzoic acid (H2mba), 4,4′-(propane-1,3-diylbis (oxy))dibenzoic acid (H2pba) or 1,4-bis (1H-imidazol-1-yl)-butane (bib) gives five new non-interpenetrating CPs, [Mn2(oba)2(CH3OH)(H2O)] (1), [Mn6(oba)6(bib)(DMF)2(H2O)4] · (DMF)2(CH3OH) (2), [Mn4(mba)4(bib)(CH3OH)] (3), [Mn7(pba)7 (bib)(H2O)4] · (H2O)3(DMA)(CH3OH)0.5 (4), and [Mn7(pba)7(H2O)6](DMA)3 (5). The X-ray crystal structural analyses revealed that 1, 4, and 5 are 2-D layers, whereas 2 and 3 are 3-D frameworks with 1-D Mn-carboxylate chains. In 1, 2, 4, and 5, the 1-D Mn-carboxylate chains are formed by flexible carboxylate ligands and Mn ions; these were then linked by organic ligands in different directions, leading to the formation of 2-D and 3-D frameworks. Furthermore, IR, PXRD, elemental analysis, TGA, and magnetic properties have been investigated.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）