JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
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IF 7.489
Zhe Li,Shudi Mao,Ying Yang,Zhuo Sun,Ran Zhao
Capacitive deionization (CDI) is considered one of the most promising desalination technologies for obtaining fresh water from saline water. In this work, we synthesized a hollow core–shell Co-MOF@Fe/Co-LDH (Co-Fe-LDH) material by developing a strategy to simultaneously grow Co/Fe-LDH on the surface of a Co-MOF precursor in situ. Owing to the increase in the specific surface area of the hollow structure and the Faradaic process of a layered double hydroxide (LDH), the Co-Fe-LDH material exhibits high electrical double layer (EDL) capacitance and pseudocapacitance, which significantly improves the salt adsorption of the material during CDI (34.2 mg/g in a 600 mg/L NaCl solution at 1.2 V). The adsorption for NaCl in this work is approximately 2.5 times the maximum salt adsorption capacity (SAC) of LDH materials applied in nonmembrane CDI (NMCDI). This work may provide a promising model for the application of hollow LDH materials that exhibit pseudocapacitance in CDI.
研究领域:
材料科学
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环境工程
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海水淡化技术
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DOI
PubMed
高影响因子
Analytical Methods
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2017
·Vol. 9
·期 6
·974-979
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IF 1.9
Jian Xin Xie,Wen Jing Chen,Xian Xue Wu,Yun Ying Wu,Hong Lin
It was found that Co–Fe layered double hydroxides (Co–Fe LDHs), other than intercalated LDHs, could catalyze the luminol–H2O2 chemiluminescence (CL) reaction and generate a strong CL signal. The as-prepared Co–Fe LDHs were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Based on the CL spectra, UV-visible absorption spectra and free radical scavenging assay, a possible CL mechanism was proposed. Under optimum conditions, a good linear relationship between the CL intensity and H2O2 concentration in the range of 1.0 × 10−8 to 3.0 × 10−6 mol L−1, with the limit of detection of 5.0 × 10−9 mol L−1, was obtained. Based on the glucose conversion into H2O2 by glucose oxidase, the sensitive detection of glucose could be realized with the limit of detection of 2.0 × 10−8 mol L−1. This proposed method has been applied to the determination of H2O2 and glucose in real samples with satisfactory results.
研究领域:
分析化学
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生物医学工程
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Hongbin Chen,Zhongye Yu,Weikun Sun,Tao Li,Jian Zhang,Zumin Qiu,Mohammad Younas
In this work, 2LDH-CoFe 2 O 4 @BHC catalyst was prepared by modifying magnetic corncob-based hydrochar (CoFe 2 O 4 @BHC) with Co/Fe layered double hydroxide (Co/Fe-LDH), which was used to activate peroxymonosulfate (PMS) for tetracycline (TC) degradation. 2LDH-CoFe 2 O 4 @BHC demonstrated effective activation of PMS and rapid removal of TC (100 %) within 10 min by leveraging structural modulation and synergistic interactions among multiple components. In contrast, BHC (26.02 %), CoFe 2 O 4 (59.25 %), and CoFe 2 O 4 @BHC (61.88 %) presented poor removal efficiency. Furthermore, it was shown that both the free radicals (SO 4 •- ) and non-free radicals ( 1 O 2 ) were essential in the degradation process, and the catalytic mechanism was revealed to be a synergistic process with the characterization results from in-situ Raman, electrochemical characterization, and X-ray photoelectron spectroscopy (XPS). The catalytic performance of 2LDH-CoFe 2 O 4 @BHC was also evaluated using a self-developed fixed-bed reactor, demonstrating its strong stability and resistance to interference during long-term operation. The potential degradation pathway of TC in the 2LDH-CoFe 2 O 4 @BHC + PMS system was suggested based on the quadrupole time-of-flight mass spectrometry (QTOF/MS) findings. It was found that the toxicity of the intermediates produced by TC degradation significantly reduced. This study presented an insight for the decomposition of organic pollutants by synthetic biochar-loaded catalysts.
研究领域:
环境科学
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化学工程
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材料科学
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分析化学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Yuanming Deng,Xi Zou,Zairan Liu,Jinzhi Wang,Zhong Wang,Jiaoning Tang
Here we present a simple method to prepare a highly efficient three components nanocomposites via thermal degradation of layered double metal hydroxides (LDHs)@polyvinyl alcohol (PVA) composites. Co 7 Fe 3 /CoFe 2 O 4 @C obtained from this method is applied to activate peroxymonosulfate (PMS) to degrade polluted organics and showed excellent performance. The best removal RhB efficiency of Co 7 Fe 3 /CoFe 2 O 4 @C (Co/Fe = 1:1) is near 100% within 10 min and the lowest ions elution (∼0.05 mg/L) under pH = 7, which is also better than the performance of the precursor Co–Fe LDH. Through further cycling experiments and degradation of p -nitrophenol, the stability and catalytic performance of the catalyst were verified. Finally, free radical scavenging experiments prove ·OH and SO 4 · - radicals participating in the reaction, which are the key factors for degradation. Based on the above, the derivation of the mechanism of Co 7 Fe 3 /CoFe 2 O 4 @C (Co/Fe = 1:1) catalyzing PMS to degrade polluted organics was proposed, and we consider this catalyst has great application prospect.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2026
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IF 6.7
Lixin Wang,Renjie Ji,Chunge Wang,Fanbo Meng,Zhongwu Luo,Mengran Wang,Hui Jin,Shijie Yang,Shi’an Zhao,Dahao Han,Yongjie Cheng,Tianyu Liu,Jianmin Ma,Yonghong Liu
To address the limited activity and durability of oxygen evolution reaction (OER) electrocatalysts, we present an integrated in situ strategy for constructing a three-dimensional Ni-Co dendritic electrode matrix coupled with a surface amorphous Ni-Co-Fe layered double hydroxide (LDH) catalytic layer. A Ni-Co dendritic matrix (NCDEM) with enhanced electrolyte accessibility and mass transport properties is first fabricated via jet electrodeposition, followed by the in situ hydrothermal growth of Ni-Co-Fe LDH nanosheets to construct a Ni-Co-Fe dendritic electrode (NCFDE). The introduction of NaBO₂ during the hydrothermal process regulates surface etching kinetics and the Fe³ ⁺ coordination environment, promoting uniform nanosheet growth and triggering the crystalline-to-amorphous transition of the LDH structure. The amorphous LDH layer increases the accessible active surface area, facilitates the formation of reconstructed NiOOH active species during OER, and enhances structural stability during prolonged electrochemical operation. The optimized B2-NCFDE exhibits outstanding OER performance in 1 M KOH, requiring an overpotential of only 215.34 mV to achieve 100 mA cm⁻², with a Tafel slope of 38.29 mV dec⁻¹ and stable operation at 500 mA cm⁻² for 2000 h. Furthermore, the B2-NCFDE||B2-NCFDE electrolyzer achieves 100 mA cm⁻² at a cell voltage of 1.822 V and demonstrates excellent durability for overall water splitting. This work provides a scalable strategy that integrates electrode architecture engineering with amorphous LDH regulation for efficient and durable hydrogen production.
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高影响因子
SEPARATION SCIENCE AND TECHNOLOGY
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2025
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IF 2.3
Chunlai Wu,Aimaiti Gali,Chuanyun Peng,Yalei Miao,Juan Li,Xinyu Gao
The treatment of dye wastewater is of crucial significance for alleviating water pollution, ensuring ecological security and achieving the sustainable utilization of water resources. In this work, the 1-allyl-3-butylimidazolium chloride ionic liquid modified Co/Fe-LDH (Co/Fe-LDH@IL) was successfully synthesized and explored for elimination Methylene Blue (MB) from aqueous solutions. Characterizations revealed that the incorporation of ionic liquids notably increased the specific surface area from 5.37 m2.g−1 to 8.15 m2.g−1. Additionally, the number of surface active sites, was significantly enhanced. For a 25 mL MB solution with an initial concentration of 300 mg.L−1, the optimal dosage of Co/Fe-LDH@IL was determined to be 30 mg, achieving adsorption equilibrium within 20 min. Under these conditions, the maximum adsorption capacity was 517.43 mg.g−1. Kinetic studies indicated that the pseudo-second-order model accurately described the process. The Langmuir isotherm model provided a better fit than the Freundlich model, indicating a homogeneous monolayer adsorption mechanism. Column adsorption experiments further validated the superior performance of Co/Fe-LDH@IL in treating MB solutions of different concentrations. The adsorption mechanism involved electrostatic interactions, interface regulation by IL molecules, and monolayer π-π interaction adsorption on imidazole functional group. Co/Fe-LDH@IL exhibits outstanding adsorption performance and stability, showing great potential for efficiently treating MB-containing wastewater.
研究领域:
环境科学
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材料化学
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水处理技术
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吸附工程
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DOI
高影响因子
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