Journal of Central South University
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2024
·Vol. 31
·期 4
·1292-1305
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IF 3.7
Hou Jin-feng,Sun Qian,Hao Xiu-zhen
Heavy metal composite pollution is becoming increasingly serious. In this study, CaAl-layered double hydroxide (CaAl-LDH) was prepared using the facile co-precipitating method, and was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), fourier transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS). Lead(II), Cd(II), and As(V) were selected as the representative heavy metals to evaluate the adsorption capability of the synthesized CaAl-LDH by the batch experiments. The maximal adsorption capability of CaAl-LDH for Pb(II), Cd(II), and As(V) was 786.6, 437.2 and 72.9 mg/g, respectively. The adsorption mechanism of Pb, Cd and As may be surface precipitation, isomorphic substitution and ion exchange within the interlayer spaces of LDH, respectively. In conclusion, this experiment provides a LDH material with fast and efficient adsorption performance for both anionic and cationic metals, indicating its potential for practical application in the remediation of heavy metal composite pollution.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
Journal of Environmental Sciences
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2020
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IF 4.302
Shengbo Li,Lijia Dong,Zuofu Wei,Guodong Sheng,Kui Du,Baowei Hu
Herein, we developed the invasive plant-derived biochar (IPB) functionalized with CaAl-LDH at five mass ratios using a physical mixture method, assessed their adsorption perform for Eu(III), and explored the relative mechanisms. Results show that the IPB successfully loaded CaAl-LDH in five composites and their Eu(III) sorption affinities were strongly affected by solution pH, contact time, temperature, and the mass ratio of LDH and IPB. All the sorpiton process for Eu(III) occurred on the heterogeneous surface of five composites and the boundary layer diffusion limited the chemical sorption rate. Interestingly, the CaAl-LDH/IPB composite with high ratio of IPB had higher sorption capacity than the one with high ratio of LDH due to larger porosity of the former. Three mechanisms containing ion exchange between Al and Eu ions, surface complexation with carboxyl- and oxygen-containing functional groups, and precipitation were involved in the Eu(III) sorption, but the dominant sorption mechanism for each CaAl-LDH/IPB composite differed with different mass ratio of CaAl-LDH and IPB. In composite with more IPB (e.g., CaAl-LDH/IPB-13), both ion exchange and surface complexes dominated the sorption process and the intensity of Eu 3+ was identified with the one of Eu 2 O 3. Whereas in composites with high LDH, ion exchange dominated the sorption and the intensity of Eu 3+ was obviously higher than the one of Eu 2 O 3 . This research will provide a new perspective for the application of the LDH/biochar materials.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
CORROSION SCIENCE
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2024
·
IF 7.4
Jingjing Wang,Yanhui Cao,Junhao Xue,Xinyue Zhang,Yu Liang,Kaifeng Chen,Congshu Huang,Dajiang Zheng
The in-depth influence mechanism of the functional groups and conjugated structure of aromatic inhibitor on the corrosion protection ability of CaAl layered double hydroxide (CaAl-LDH) in epoxy coatings was investigated by performing the inhibitor modification using three typical aromatic inhibitors. The electrochemistry impedance spectroscopy (EIS) measurement demonstrated that CaAl-LDH-MBT showed superior protection for carbon steel in epoxy coatings. Density functional theory (DFT) calculation and molecular dynamic (MD) simulation indicated that the aromatic conjugated structure with larger π electron clouds and heteroatoms with lone pair electrons would contribute to the enhanced corrosion protection.
研究领域:
材料科学
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腐蚀科学
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表面化学
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计算化学
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产品关联
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2025
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IF 7.8
Jing Bai,Qijia You,Yushuan Peng,Zhihao Li,Yuling Zhang,Qiulin Deng,Huiwei Liao,Faqin Dong,Xiaofeng Zeng,Zixun Yan
In this work, a novel calcium-aluminum layered double hydroxide-chitosan composite gel bead (LDH-CS) was synthesized for the efficient removal of Pb 2+ from high-salinity oil/gas field wastewater. The successful manufacture of CaAl-LDH by coprecipitation was achieved by utilizing CH 3 COONa to activate PG as an alternative to traditional calcium sources, thereby supporting the value-added use of industrial solid waste. Furthermore, the excellent compatibility between CS and LDH was confirmed through multiple characterization techniques, including SEM/EDS, FT-IR, XRD, and XPS. The greatest adsorption capability of LDH-CS was 827.9±9.6 mg g -1 under the optimal conditions of 0.2 g L -1 dosage, pH of 5, and 25 °C, as confirmed by batch experiments. Fixed-bed experiments confirmed that LDH-CS exhibits outstanding selective adsorption performance in high-salinity wastewater systems from actual oil/gas field, achieving a 99% removal efficiency for Pb 2+ . Compared with traditional powder adsorbents, the efficiency of solid-liquid separation after adsorption is substantially improved by embedding LDH powder in chitosan matrix in LDH-CS gel bead. This design prevents secondary pollution from suspended particles and ensures heavy metal release levels are well below safety limits. LDH-CS provides a practical, efficient and cost-effective technical solution for the treatment of lead-containing wastewater.
研究领域:
环境科学
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水处理技术
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材料科学
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重金属修复
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工业固废资源化
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）