CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Hanhan Huang,Caifeng Xia,Derui Liang,Yuan Xie,Fanping Kong,Jinxiu Fu,Zhiwen Dou,Qinghua Yang,Wenjing Suo,Qian Zhang,Zilin Meng
Novel biotite (Bt) supported different amounts of Mg-Al layered double hydroxide (LDH@Bt) with a three-dimensional hierarchical structure was fabricated via in-situ growth method. The structural and morphology characterization indicate that LDHs stably and uniformly dispersed on Bt surface, but excessive LDHs still lead to obvious aggregation of LDHs. The removal performance of LDH@Bt for heavy metal of Cu 2+ /Pb 2+ and pesticides of glyphosate (GLY)/2-methyl-4-chlorophenoxyacetic acid (MCP) in soil was investigated, and the removal rates of LDH@Bt composite for four contaminants were higher than those of LDHs and Bt. Intraparticle diffusion and pseudo-second-order model well described the kinetics of heavy metals and pesticides removal. Adsorption isotherm data of Cu 2+ and Pb 2+ yielded better accordance of Freundlich model, while data of GLY and MCP were fitted Langmuir model well. In addition, different adsorption mechanisms for removal of Cu 2+ /Pb 2+ by precipitation and removal of GLY/MCP by surface adsorption were proposed. The application performance and recovery ability of LDH@Bt composite in soil were evaluated by column leaching experiments and magnetic collectability tests. The excellent removal performance and magnetic collectability provided a promising strategy for remediation and elimination of heavy metals and pesticides contaminations from soil.
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
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Xiaohui Li,Zehai Xu,Qin Meng,Yu Chen,Lushen Xu,Guoliang Zhang
In this study, we have developed a facile in -situ hydrothermal oxidative polymerization method to synthesize poly N,N(1,3-phenylene)dimethanimine/KH550-black talc (PNPD/KH550-BT) nanocomposites for efficient removal of lead (II) (Pb 2+ ) in wastewater. This method employed eco-friendly solvent, offered a simple and cost-effective preparation procedure and resulted in a nanocomposite complex that displayed exceptional resistance to dissolve in various organic solvents, simplifying the separation process. Through the hydrothermal oxidative polymerization process, polymerization was promoted to generate spherical flower-like structures, effectively improving the dispersion of polymers on black talc nanosheets. Substantial concentration of sturdy lead-complexing groups was created, including N–H, –C N, and –NH 2 , which heightened the attraction to Pb 2+ ions and maximized the effective utilization of lead binding sites. Compared with KH550-BT and PNPD, the adsorption performance of PNPD/KH550-BT composites on Pb 2+ was significantly enhanced, and the largest adsorption capacity of lead (II) on PNPD/KH550-BT nanocomposites reached 867.1 mg/g. Moreover, the prepared nanocomposites had satisfactory adsorption potential after undergoing 10 cycles, showing good stability during adsorption. This work not only provides a new strategy to control the microstructure of polymer-based composite adsorbent but also presents various promising functionalized nanocomposites based on different polymers and minerals for application in vast fields.
研究领域:
环境科学
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材料科学
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化学工程
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产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2024
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IF 0
Cai Fangfei,Zhang Xiaoying,Ma Funing,Qi Linlin,Lu Di,Dai Zhenxue
The distribution coefficient ( K d ) of radionuclides is a crucial parameter in assessing the safety of high-level radioactive waste (HLW) geological repository. It is determined in the laboratory through batch and column experiments. However, differences in obtained K d values from distinct experiments have not been thoroughly assessed and compared. This study evaluated strontium (Sr) sorption on different granite materials using static batch and dynamic experiments (column and core-flooding experiments). The results from batch sorption experiments showed higher Sr sorption on granite under acidic and strongly alkaline conditions, low solid–liquid ratios, and low ionic strength. In column experiments, a two-site sorption model was used to simulate Sr transport in crushed granite and mixed pure minerals. The sorption of Sr on crushed granite exhibited a higher affinity than that of mixed pure minerals. The dual-porosity transport model was employed to investigate Sr transport behavior in fractured granite in the core-flooding experiment. K d obtained from batch sorption experiments are four to twenty times higher than those from column experiments, and two to three orders of magnitude higher than that from a core-flooding experiment. The results of this study provide valuable insights into safety assessment for the HLW geological repository.
研究领域:
环境科学
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放射性废物管理
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产品关联
DOI
PubMed
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
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2024
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IF 3
Ma Xin-Yue,Cao Fang-Chao,Tang Yan,Jiang Jun-Cheng,Huang An-Chi
In this paper, a modified material EG-PR with hydrophobic and oleophobic properties was successfully prepared with expanded graphite (EG) as the main raw material and 1H,1H,2H,2H-perfluorodecyltrimethoxysilane (PR) and silane coupler KH-570 (KH) as surface modifiers. Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy verified the effective modification that produced a Si‒O‒Si network structure. The water contact angle (WCA) of 127° and oil contact angle (OCA) of 110° of EG-PR, unmodified EG-IA, were 92° and 20°, respectively. Fire-extinguishing tests conducted on heptane pool fire showed that EG-PR decreased the time required to extinguish the fires by 23 s, consumed less extinguishing agent, and suppressed the production of carbon dioxide during combustion compared to EG-IA, indicating its higher effectiveness. EG-PR demonstrated rapid fire-extinguishing capabilities during the experiments. It effectively extinguished the flames, created a protective layer on the oil pool’s surface, efficiently isolated heat and oxygen, and effectively suppressed flame propagation on the surface. This study highlights the potential of surface-modified expandable graphite in enhancing fire safety applications. Graphical abstract
研究领域:
材料科学
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消防工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Daheng Wu,Jianing Wang,Yuxiang Zhao,Shengfei Li,Haoyong Yang,Runxiang Tan,Tao Zhang
The widespread use of petroleum-based plastics brings potential hazards to the ecological environment. In order to solve this issue, the development of biodegradable materials with both high mechanical, barrier performances and food safety is imminent. In this work, a natural nacre-inspired seaweed-based nanocomposite material with the structure of “brick and mortar” is synthesized by rational assembling mica nanosheets in a mixture of glycerol and sodium alginate. The resultant SA/nano-mica film (1 wt% of phlogopite powder) shows high thermal stability (>180 °C) and exhibits great tensile strength of ∼ 16 MPa at ambient condition, surpassing some other reported nanocomposite materials (1.9–14.74 MPa). Meanwhile, the composite can be easily processed into different shapes for packaging applications, which could long-term preserve the freshness of foods owing to their strong ultraviolet (UV) shielding and gas barrier properties (UV transmittance of ∼ 4 % and oxygen transmission rates (100 µm) of ∼ 18.52 cc m −2 day −1 bar −1 ). Importantly, the material could completely degrade in soil within 15 days. These results indicate the great application prospect of seaweed-based nanocomposite materials in food packaging.
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产品关联
DOI
高影响因子
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