ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Zhen Liu,Huajun Zhou,Simon S. Ang,Jian-Jun Zhang
Here we report the evaluation of natrochalcite (Na[Cu 2 (OH)(H 2 O)(SO 4 ) 2 ]), an anionic layered structure [Cu 2 (OH)(H 2 O)(SO 4 ) 2 ] − charge-balanced by Na + , as an anode material for both Li- and Na-ion batteries. It delivers 224 mAh/g and 175 mAh/g in the first discharge in the Li + - and Na + -cells respectively, and decomposes to form amorphous matrixes during this step. In the subsequent charge, the original layered structure is unusually partially recrystallized back from the matrixes, resulting in 53 mAh/g and 35 mAh/g discharge capacities in the second discharge respectively. In subsequent cycling, Li + in the electrolyte is found to replace the original Na + during cycling in the Li + -cell and the electrode in the Li + -cell demonstrates better capacity retention rates than that in the Na + -cell, possibly due to Li + being smaller than Na + and thus decomposition-recrystallization cycles being more reversible during cycling in the Li + -cell.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
CHEMOSPHERE
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2020
·
IF 5.778
Chuang Fu,Xianliang Yi,Yang Liu,Hao Zhou
Sulfonamide antibiotics (SAs) are widely used in veterinary medicine but are poorly metabolized in biological systems; thus, they can cause a selective pressure to promote the proliferation of antibiotic resistant pathogens and threaten human health. Persulfate (PS)-based advanced oxidation processes (AOPs) have been applied for SA degradation, but using transition metal ions as PS activators is relatively limited. In this study, sulfamethazine (SMZ) was used as a model SA to evaluate the performance of a Cu 2+ -activated PS system. Cu 2+ -PS exhibited better SMZ removal than other metal ions, and 25 mg/L SMZ can be degraded in the presence of 0.2 mM Cu 2+ and 2.5 g L −1 PS within 120 min. Various anions inhibited SMZ degradation to different degrees except HCO 3 − . Among the cations, Fe 3+ significantly inhibited SMZ removal, while Ni 2+ increased the removal rate. High concentrations of humic acid and protein also increased the degradation rate of SMZ. Radical and singlet oxygen quenching experiments, together with the results of electron spin-resonance spectroscopy (ESR), showed that the main active species generated from Cu 2+ -PS are SO 4 · - and ·OH. The degradation pathway of SMZ was identified through HPLC-HRMS. Direct SO 4 · - and ·OH oxidation products of SMZ were not found, suggesting that the complex formed between Cu 2+ and SMZ may affect the fate of SMZ. On the other hand, the efficiency and selectivity of Cu 2+ -PS against different SAs were confirmed. Overall, this study provides a facile and effective method for SMZ and other SA removal.
研究领域:
环境科学
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化学工程
·
水处理
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DOI
PubMed
高影响因子
JOURNAL OF CATALYSIS
·
2023
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IF 7.3
Jin Yuan,Zhiwei He,Hongbo Zhang
Selective C–H bond oxidation of cyclohexane into KA oil (ketone-alcohol) is of vital importance in both fundamental research and industrial applications while limited by complex reaction network and suffering from low efficiency. In this study, Ce(OH)SO 4 · x H 2 O was chosen as a probe to systematically investigate the C–H bond activation and C–C bond rupture as a function of various reaction parameters, including the reactant/product concentrations, catalyst applied, reaction temperatures, acidic concentrations etc, and found that bi-molecule of C 6 H 12 was probably involved in both C–H bond rupture and C–C bond cleavage and both were controlled by one deprotonation elementary step with ·O 2 – and h + as the key active components, which were supported by parity fittings and primary KIEs determined. In addition, the C–C bond rupture was found to be mainly following C 6 H 10 O to ε-caprolactone and further to linear acids reaction path. Hopefully, this study could help people find/optimize reaction systems in selective hydrocarbon upgradings.
研究领域:
化学工程
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有机化学
·
催化
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2020
·
IF 9.038
Kai Li,Shuanglong Ma,Shengjun Xu,Haichao Fu,Zhuoqian Li,Yi Li,Shiliang Liu,Jinge Du
Three magnetic biochar nanocomposites named as C800-1, C800-2 and C800-3 with increased iron deposition amount, decreased graphitized degree and gradually destroyed graphitized carbon layers, respectively, were prepared using potassium ferrate as activator and corn straw as biomass. C800-1, C800-2 and C800-3 exhibited much different bisphenol A degradation effect in presence of peroxymonosulfate among which C800-3 owned the best catalytic performance. For the degradation mechanism, the dominant role of electron transfer pathway was gradually replaced by the SO 4 •– pathway with the increase of iron amount and the destruction of graphitized carbon layers. This work would provide a simple and feasible method, namely changing the ratio of potassium ferrate and biochar, to manipulate the radical and nonradical degradation pathway in PMS-based organic wastewater purification.
研究领域:
环境科学
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化学工程
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2021
·
IF 19.503
Li Zhang,Weiwei Lu,Peng Xu,Hao Wang,Xuefeng Wei,Kaisheng Yao,Shuge Peng
In this study, we propose a novel photo-activation method to remove persistent organic pollutants through a SO4˙ˉ-based advanced oxidation process . Core–shell Ag@Pd nanocubes were prepared by a facile seed-mediated method and, afterward, explored for photodegradation of a representative ionic liquid (IL), [C 4 mim]Br. Electron paramagnetic resonance measurements and radical scavenging experiments demonstrated that the species mainly responsible for degrading [C 4 mim]Br were the radicals of SO4˙ˉ. The plasmon-mediated nature of the Ag@Pd catalysts was verified by their wavelength-dependent performance. Subsequent optical simulation indicated that, other than the plasmonic Ag core, the non-plasmonic Pd shell was the preferential site for dissipating the absorbed photons into energetic charge carriers to produce the radical species. Finally, based on the detected intermediates, we propose the degradation pathway of ILs in the plasmon-mediated process. The results of our method suggest favorable application in the treatment of wastewater.
研究领域:
环境科学
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纳米技术
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化学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Xue Chen,Chunyan Hu,Feng Hong,Yanfen Fang,Xi Yuan,Hailin Tian,Yingping Huang
Hydrodynamic cavitation (HC) is a promising technology for the removal of organic pollutants because the collapse of cavitation bubbles can generate reactive oxygen species (ROS) from the water molecular. However, the controlled reactive oxygen species (ROS) in the HC process remains a challenge. This study has regulated the dominant radical species in HC-activated persulfate (PDS) systems by adjusting experimental conditions, such as PDS dosage and pH. Atrazine (ATZ) degradation of 95 % was achieved after 180 min in HC-activated PDS of 0.37 mM at pH = 6.8. The mineralization rate of ATZ was 44.9 % due to the synergistic effect of sulfate radical ( SO 4 − ) and hydroxyl radical ( OH). The main degradation pathways of ATZ were dealkylation products and ring-opening products. Increasing the PDS dosage to 3.7 mM, the degradation of ATZ was 94.0 % after 60 min with the dominant radical of SO 4 − , while the mineralization rate of ATZ was only 8.8 %. Correspondingly, when OH was the dominant radical in HC-activated PDS at pH = 3.5, the removal rate and mineralization rate of ATZ reached 97.5 % and 77.4 %, respectively. It is demonstrated that the contribution of ROS was difference in HC-activated PDS systems for the ATZ degradation and mineralization. The controlled strategy of ROS in HC-activated PDS systems offers a promising approach for effectively eliminating various organic pollutants in the wastewater.
研究领域:
环境科学
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化学工程
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产品关联
DOI
高影响因子
Journal of Energy Storage
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2024
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IF 8.9
Biao Hu,Jiachen Li,Xin Du,Zhenying Zhang,Hui Wang
A novel eutectic phase change material with light absorption and high thermal conductivity was successfully prepared. The based phase change material was ammonium aluminum sulfate dodecahydrate‑sodium sulfate eutectic phase change materials. The black Ti 2 O 3 after ball milling was selected as light thermal conversion material which can absorb sunlight effectively and simultaneously convert the light to thermal and the expanded graphite was added to further improve the thermal conductivity of phase change materials. The phase change temperature of the eutectic phase change material was effectively regulated to 80 °C compared with 93 °C of pure aluminum sulfate dodecahydrate. The thermal conductivity of eutectic phase change materials with expanded graphite was enhanced to 1.16 W·m −1 ·K −1 compared with 0.53 W·m −1 ·K −1 of the pure eutectic phase change material. By adding Ti 2 O 3 , the combination material shows the best solar absorbance capacity of 87.96 % compared with the pure eutectic phase change materials of 73.43 %. The latent heat of the novel material was 190.97 kJ/kg. Considering their huge superiority of highly efficient use of solar energy in natural resources, the new novel ammonium aluminum sulfate dodecahydrate‑sodium sulfate eutectic-based phase change material with excellent light absorbance, enhanced thermal conductivity, and high latent heat performance is a very promising material for solar-thermal conversion and energy storage.
研究领域:
材料科学
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能源工程
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太阳能技术
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产品关联
DOI
高影响因子
Catalysts
·
2020
·Vol. 10
·期 2
·207
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IF 3.52
Hua Nie,Wei Li,Qirong Wu,Vladislav Rac,Vesna Rakić,Xuesen Du
Poisoning effects by alkali metal chlorides is one of the major reasons for the deactivation of SCR catalyst in biomass-fired plants. In this study, the influence of KCl on two vanadium-based catalysts with different promoters, V2O5-WO3/TiO2and V2O5-Ce(SO4)2/TiO2, was investigated. The catalytic activity of the fresh V2O5-WO3/TiO2was higher than that of V2O5-Ce(SO4)2/TiO2at low temperatures. V2O5-Ce(SO4)2/TiO2performed better than V2O5-WO3/TiO2when KCl was deposited on the catalyst surface. Both poisoned catalysts were efficiently regenerated by SO2treatment. The characterization results show that the reducibility and acidity of the catalysts were weakened by KCl deposition but regenerated by SO2.
研究领域:
环境催化
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大气污染控制
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材料化学
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工业催化
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能源工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2020
·
IF 6.155
Shao-Fang Li,Zhen-Yi Gu,Jin-Zhi Guo,Xian-Kun Hou,Xu Yang,Bo Zhao,Xing-Long Wu
In recent years, sodium-ion batteries (SIBs) have been considered as one of the most promising alternatives to lithium-ion batteries (LIBs). Here, a new Na-super-ionic conductor (NASICON) cathode material NaFe 2 PO 4 (SO 4 ) 2 is successfully prepared through solid state method for SIBs. While the poor electronic conductivity of iron-based materials results in its poor rate and cycle performance. Then the electrochemical is effectively promoting via Ca 2+ doping. Na 0.84 Ca 0.08 Fe 2 PO 4 (SO 4 ) 2 have achieved considerable electrochemical properties. The first discharge specific capacity is 121.6 mA h g −1 at 25 mA g −1 with the voltage platform (∼3.1 V) corresponding to Fe 2+/3+ . After 100 cycles, the capacity retention is 55.1 %. The excellent electrochemical performance is caused by some Na + is substituted by Ca 2+ and leading to the fast sodium kinetics, which is well proved by the powder X-ray diffraction pattern and well corresponding to the galvanostatic intermittent titration technique and cyclic voltammetry testing result (the diffusivity values are around at 10 −12 cm 2 s −1 ).
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
HYDROMETALLURGY
·
2024
·
IF 4.8
Lining Yu,Huazhen Cao,Huibin Zhang,Junfeng Kong,Weilun Qian,Anyang Tang,Wenyu Feng,Guoqu Zheng
Owing to the characteristics of mineral paragenesis (equilibrium sequence of mineral phases), the hydrochloric acid leach liquors of Sn ores and Sn-containing waste materials typically contain large amounts of Pb. In this study, barium sulfate coprecipitation was employed to efficiently remove Pb from a tin chloride solution. The lead removal efficiency, reaction mechanism, and limitations were investigated by varying the Cl − and SO 4 2− concentrations. The results showed that the structural formula of the precipitates was (Ba x Pb y )(SO 4 ) 2 (x + y = 2), and its solubility product was in the range of 1 × 10 −12 –1 × 10 −13 , indicating that Pb 2+ and Ba 2+ were more easily precipitated in the form of complex salts. In addition, thermodynamic analysis revealed that when the Cl − concentration was <1 mol/L in the Pb 2+ –Sn 2+ –Cl − –H 2 O system, [Pb 2+ ] and [PbCl + ] were the primary species. These positively charged species were readily adsorbed onto the surface of BaSO 4 via electrostatic forces, resulting in a significant increase in the Pb content of (Ba x Pb y )(SO 4 ) 2 . Therefore, the Pb removal efficiency significantly improved as Cl − concentration decreased. The lead removal mechanism involves a combination of adsorption and replacement processes. Based on the aforementioned fundamental study, a method involving dechlorination and coprecipitation was proposed to remove lead from an acid leaching solution of Kaldo slag. With the dechlorination via distillation, the Pb removal efficiency could reach 99.9% at 1 mol/L Cl − and 0.5 mol/L SO 4 2− .
研究领域:
冶金工程
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环境科学
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产品关联
DOI
高影响因子
SOLID STATE SCIENCES
·
2020
·
IF 2.434
Xiaofang Li,Yuandong Wu,Dajiang Mei,Hagen Poddig,Thomas Doert
Three hexasodium transition metal sulfates, Na 6 M (SO 4 ) 4 ·2H 2 O ( M = Fe, Co, Ni) were obtained by a dissolution and precipitation route and by hydrothermal reactions . The compounds were characterized by single crystal X-ray diffractions, UV/vis and IR spectroscopy , thermal analyses, and magnetization measurements. The title compounds all crystallize in the triclinic space group P 1 ‾ (No. 2) with Z = 1 and lattice parameters : a = 6.0679(8), b = 6.8658(8), c = 10.1508(12) Å, β = 92.557(4)° for Na 6 Fe(SO 4 ) 4 ·2H 2 O; a = 6.0595(5), b = 6.8446(6), c = 10.1149(8), β = 92.548(2)° for Na 6 Co(SO 4 ) 4 ·2H 2 O; a = 6.0490(4), b = 6.8265(5), c = 10.0793(7), β = 92.5470(10)° for Na 6 Ni(SO 4 ) 4 ·2H 2 O, respectively. [M(SO 4 ) 4 ] 6- anions are interconnected by hydrogen bonds to form two-dimensional layers in these structures. The solid-state UV/vis/NIR diffuse reflectance spectroscopy indicates that Na 6 M (SO 4 ) 4 ·2H 2 O ( M = Co, Ni) are insulators. Magnetization experiments show a nearly linear temperature dependence of the inverse susceptibility down to 2 K, which indicates a paramagnetic behavior for all three compounds.
研究领域:
材料科学
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无机化学
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产品关联
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Pengfei Gan,Yichun Sun,Yunyi Li,Wen Liu,Jiangyu Ye,Meiping Tong,Jialiang Liang
In this work, the different selectivity of SO 4 •- and • OH towards municipal solid waste incineration leachates (MSWILs) was studied by a comparative study of UV/persulfate (PS) and UV/H 2 O 2 . Results showed SO 4 •- preferentially mineralized carbon atoms of higher average oxidation state, while • OH showed a two-stage mechanism of partial oxidation and mineralization successively. Electron spin resonance (ESR) analysis showed SO 4 •- had superior selectivity towards MSWILs than • OH, and Fe(II) would significantly affect the selectivity via forming Fe-MSWILs complex. As the consequence, Fe(II) showed slightly negative effect on UV/PS, but greatly enhanced the performance of UV/H 2 O 2 /Fe(II). High concentration of Cl - affected the degradation of non-fluorescent substances by UV/PS, while SO 4 2 - and NO 3 - showed no effect. In contrast, anions showed no effect on UV/H 2 O 2 . In addition, • OH preferentially attacked large molecules, but SO 4 •- showed no selectivity. This study further revealed the selectivity of SO 4 •- and • OH in the treatment of hypersaline wastewater, and provided theoretical support for the development of targeted technology .
研究领域:
环境科学
·
化学工程
✓ 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）