Materials
·
2023
·Vol. 16
·期 21
·6879
·
IF 3.4
Yuquan Wang,Yidong Xu,Xinjie Cai,Jinting Wu
Adsorption and photocatalysis are effective in removing organic pollutants from wastewater. This study is based on the memory effects of MgAl–layered double hydroxides (MgAl–LDHs) after high-temperature calcination. By introducing bismuth vanadate (BiVO4) during the reformation of the layered structure via contact with water, a composite material BiVO4/MgAl–LDHs with enhanced adsorption and visible light catalytic performance was synthesized. The effects of the calcination temperature, ratio, initial methylene blue (MB) concentration, and catalyst dosage on the adsorption and photocatalytic performance were investigated. The BiVO4/MgAl–LDHs showed better photocatalytic performance than the pure BiVO4and MgAl–LDHs. Under the optimal conditions, the proportion of MB adsorbed in 20 min was 66.1%, and the percentage of MB degraded during 100 min of photolysis was 92.4%. The composite photocatalyst showed good chemical stability and cyclability, and the adsorption-degradation rate was 86% after four cycles. Analyses of the adsorption and photocatalytic mechanisms for the composite material showed that synergistic adsorption and visible light photocatalysis contributed to the excellent catalytic performance of the BiVO4/MgAl–LDHs. A highly adsorbent photocatalytic composite material exhibiting outstanding performance was prepared via a simple, cost-effective, and environmentally friendly method, providing reference information for the removal of organic pollutants from liquids.Keywords:BiVO4;MgAl–LDHs;memory effect;adsorption-visible photocatalytic performance;organic pollutants
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2022
·
IF 4.865
Yumiao Jiang,Shuai Gao,Yingxue Liu,Huijie Huangfu,Xugeng Guo,Jinglai Zhang
Fabricating layered double hydroxides (LDHs) coatings intercalated with corrosion inhibitors is considered an effective strategy for improving the corrosion resistance of metal substrates. However, to our best knowledge, studies applying LDHs coatings modified with ionic liquids (ILs) as environmentally friendly corrosion inhibitors to corrosion protection of metals and alloys have not been reported. In this contribution, two kinds of MgAl-LDHs coatings modified with imidazolium based dicationic ILs, namely LDH-C 6 (m 2 im) 2 -I and IL@LDH-C 6 (m 2 im) 2 -I, were successfully prepared on AZ31B magnesium alloy . The LDH-C 6 (m 2 im) 2 -I coating intercalated with C 6 (m 2 im) 2 -I ionic liquid was synthesized by the co-precipitation method and hydrothermal treatment , followed by a facile immersion experiment in a dimethyl sulfoxide solution containing C 6 (m 2 im) 2 -PF 6 ionic liquid to produce the IL@LDH-C 6 (m 2 im) 2 -I composite coating . The surface morphologies and anti-corrosion properties of the two MgAl-LDHs coatings immersed in 3.5 wt% NaCl solution were investigated. The present results reveal that the LDH-C 6 (m 2 im) 2 -I coating exhibits a uniform and dense petal-like nanoflowers structure, while the IL@LDH-C 6 (m 2 im) 2 -I composite coating contains a compact C 6 (m 2 im) 2 -PF 6 IL film and a lamellar-structured LDH-C 6 (m 2 im) 2 -I, which provides a double corrosion protection to the Mg alloy. As a result, the corrosion current density of IL@LDH-C 6 (m 2 im) 2 -I is only thirty-eighth of that of LDH-C 6 (m 2 im) 2 -I and 4 orders of magnitude lower than that of bare AZ31B Mg alloy. More importantly, the surface of samples coated with IL@LDH-C 6 (m 2 im) 2 -I is still compact without being destroyed after 168 h of immersion, which can be ascribed to the synergistic effect of excellent self-healing and durable corrosion resistance. This work opens a new way of preparing MgAl-LDHs coatings modified with ionic liquids to remarkably enhance the anti-corrosion performance of Mg alloys.
研究领域:
材料科学
·
腐蚀工程
·
表面工程
·
化学工程
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Lian Ma,Yujie Qiang,Wenjie Zhao
The combination of LDHs nanocontainer and organic inhibitor demonstrates a great prospect in the field of corrosion protection. Whereas the traditional ion exchange method has a low efficiency owing to the small space and the firm force between the LDHs laminates. A high-efficiency approach of intercalating organic inhibitor into the LDHs is delivered in this work. The MgAl-LDHs loaded with 5-aminoindazole (AIA) were synthesized by separating the layered structures of hydrotalcites into single-layer nanosheets and then restructuring the exfoliated nanosheets with organic inhibitor. The as-synthesized LDHs-AIA − displayed a controlled release behavior and excellent anti-corrosion performance on the copper in 3.5 wt% NaCl solution, which were characterized by UV–vis spectra and electrochemical tests. Furthermore, a series of structure and morphology tests involving SEM, TEM , XRD , FTIR, XPS and TGA were also used for further analysis the LDHs. And the analysis of corrosion products and the anti-corrosion mechanism were carried out by SEM, XRD tests. The theoretical calculations concerning the adsorption of corrosion inhibitors on the copper surface were also investigated. It can be concluded that the inhibitor-loaded LDHs have the ability to adjustably release the corrosion inhibitor in corrosive medium, thereafter the corrosion inhibitor can adsorb onto the active sites of copper surface to prevent corrosion.
研究领域:
材料科学
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腐蚀科学
·
纳米技术
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Xinrui Zhang,Zhiyue Han,Zerui Li,Ziming Yu
Explosion accidents involving high-energy fuel present substantial hazards, underscoring the urgent need for effective safety protection methods. This study employed a hydrothermal method to synthesize nanoscale MgAl-LDHs and innovatively investigated their potential for explosion suppression in the high-energy system composed of RDX/Al. The performance of explosion suppression was evaluated using two novel testing methods capable of controlling the delay time for suppressant release. Experimental results indicate that MgAl-LDHs significantly surpass traditional suppressants, such as NH 4 H 2 PO 4 and NaHCO 3 , in their ability to reduce explosion overpressure and mitigate flames. Furthermore, it was found that reduce the suppressant release delay time is more critical than merely increasing the quantity of the suppressant used. By combining SEM, XPS, GC, and other characterization techniques with quantum chemical theoretical calculations, this study innovatively reveals the explosion suppression mechanism of MgAl-LDHs, elucidating the early decomposition mechanism of RDX and the suppression process of OH in MgAl-LDHs laminates. This research serves as a brand-new example of the application of LDHs materials in explosion suppression, providing novel ideas for future applications in the field.
研究领域:
材料科学
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安全工程
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物理化学
·
纳米材料
·
燃烧与爆炸
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2019
·
IF 3.218
Xiaoting Hong,Enhao Zhu,Zhuoliang Ye,K.S. Hui,K.N. Hui
Phosphorus removal is essential to avoid eutrophication in water bodies. Layered double hydroxides (LDHs) are widely used to scavenge phosphate through intercalated ion exchange or surface complexation. Moreover, LDHs have attracted increasing attention as electrode modifiers for supercapacitors . Researchers have begun to re-delve the electrosorption technology according to the fundamental principle of electrical double layers. Herein, we propose a new phosphate removal method inspired by the adsorption characteristic and electrical double-layer capacitive properties of LDHs through electrosorption via capacitive deionization. We present a series of experiments to study the enhanced phosphate removal under an electric field via multiple mechanisms on the MgAl-LDHs/AC electrode. The uptake of phosphate by MgAl-LDHs/AC was investigated as a function of phosphate concentration, applied voltage, electrode materials , and temperature. The MgAl-LDHs/AC electrode possessed a salt removal capacity of 67.92 mg PO 4 3− ·g −1 (1.2 V, 250 mg·L −1 KH 2 PO 4 , 30 °C). The electrosorption kinetics of phosphate ions onto the capacitive deionization electrode followed the pseudo-second-order kinetics model rather than the pseudo-first-order kinetics model. Furthermore, the adsorption isotherms of phosphate on the MgAl-LDHs/AC electrode fitted the Freundlich model better than the Langmuir model. The proposed method could be used for phosphate removal.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
International Journal of Minerals Metallurgy and Materials
·
2024
·Vol. 32
·期 2
·450-463
·
IF 5.6
Zhang Wenxi,Zhuo Zhangzelong,Xu Dan,Wu Liang,Xie Zhihui
We have developed a superhydrophobic and corrosion-resistant LDH-W/PFDTMS composite coating on the surface of Mg alloy. This composite comprised a tungstate-intercalated (LDH-W) underlayer that was grown at low temperature (relative to hydrothermal reaction conditions) under atmospheric pressure and an outer polysiloxane layer created from a solution containing perfluorodecyltrimethoxysilane (PFDTMS) using a simple immersion method. The successful intercalation of tungstate into the LDH phase and the following formation of the polysiloxane layer were confirmed through X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, and X-ray photoelectron spectroscopy (XPS). The corrosion resistance of the LDH-W film, both before and after the PFDTMS modification, was evaluated using electrochemical impedance spectroscopy (EIS), Tafel curves, and immersion experiments. The results showed that Mg coated with LDH-W/PFDTMS exhibited significantly enhanced corrosion protection compared to the unmodified LDH-W film, with no apparent signs of corrosion after exposure to 3.5wt% NaCl solution for 15 d. Furthermore, the LDH-W/PFDTMS coating demonstrated superior superhydrophobicity and self-cleaning properties against water and several common beverages, as confirmed by static contact angle and water-repellency tests. These results offer valuable insights into preparing superhydrophobic and corrosion-resistant LDH-based composite coatings on Mg alloy surfaces under relatively mild reaction conditions.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Houmei You,Jinpeng Hou,Yiwen Shen,Xiangkun Zhang,Jiaxue Cai,Yaya Zhang,Yongjun Feng,Weiliang Tian,Kewei Zhang
Solid-state light-emitting devices are of special interest in optoelectronic applications, owing to inherent advantages in terms of low cost, high efficiency and desirable durability. However, the accumulation of solid fluorescent chromophores causes serious energy transfer, resulting in fluorescence quenching. Herein, exfoliated vermiculite (VMT) was structurally disassembled into Mg-O octahedral and Si-O tetrahedral layers to produce hydrotalcite (LDHs) and SiO 2 , respectively, realizing efficient utilization of each component and VMT surface. The fluorescent intercalated LDHs was intercalated with organic fluorescent dyes, including rhodamine 6G (R6G), pyronine G (PG) and sodium fluorescein (Fl-Na), to prepare high-performance fluorescent LDHs, which was further assembled with VMT nanosheets to form ultrathin solid-state light-emitting films. Based on the electrostatic self-assembly strategy, the localization of chromophores and light-emitting intensity of solid films can be precisely controlled by adjusting ordered multilayers. In fact, the exfoliated VMT could cause the quenching of organic fluorescent dyes in liquid, therefore VMT can be used as fluorescent quencher, which could be regenerated by heating. The designed assembly strategy avoids the fluorescence quenching of VMT. Without the addition of any surfactant, both anionic and cationic organic fluorescent dye can be intercalated into hydrotalcite, overcoming the disadvantage of LDHs that can only intercalate anionic molecules. In particular, the VMT encapsulation overcomes the quenching problem of fluorescent dye and improves the stability of the light-emitting films. This work provides a potential strategy for assembling solid-state light-emitting films and opens new applications in various optoelectronics, such as surface-emitting light source and full-color flat-panel displays.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
SOLID STATE SCIENCES
·
2014
·
IF 1.679
Lijun Dong,Chunling Ge,Peiyong Qin,Yan Chen,Qinghong Xu
In this study, MgAl-LDHs (layered double hydroxides) intercalated with sodium dodecyl sulfate and outside surface modified with (3-aminopropyl)triethoxysilane (KH550) were prepared. The existence of organic part in LDHs improved immobilization efficiency and activity recovery of candida lipolytic lipase loaded. Also the positive charge in framework of LDHs was found to be beneficial to the enzyme immobilization. An immobilization efficiency of 56.4% and an activity recovery over 69.2% of the enzyme were obtained after it was loaded on the intercalated and modified LDHs, and catalytic activity of the immobilization can be kept at least five times. Moreover, the immobilized enzyme was found to have higher temperature resistance, wider pH value and better thermostability in reactive activity.
研究领域:
生物化学
·
酶工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2023
·Vol. 332
·期 2
·325-335
·
IF 1.6
Tao Qinqin,Lin Shan,Bai Tengsai,Xie Jinhua,Dai Ying
An inorganic adsorbent with conveniently recovery performance is attractive in the treatment of uranium-containing wastewater. Herein magnetic Mg–Al layered double hydroxide composites (Mag-LDHs) and its calcination compound, Mag-LDHs (Mag-LDO), have been successfully prepared. Their physicochemical characteristic was analyzed with XRD, SEM, XPS, VSM, FT-IR, TGA, Zeta potential and N 2 adsorption–desorption isotherms. The adsorption behavior of both adsorbents toward uranium were investigated. The solid–liquid separation could be conveniently achieved by external magnetic field. The maximum theoretical adsorption capacities toward U(VI) were 436.16 mg/g for Mag-LDHs and 317.71 mg/g for Mag-LDO. The adsorption capacity of Mag-LDHs and Mag-LDO retained 80.72% and 85.58% even undergoing five adsorption–desorption cycles. The study proposed Mag-LDHs and Mag-LDO as alternative uranium-specific adsorbents applicable in the acid wastewater (pH = 5.5).
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2024
·
IF 2.2
Fengrong Zhang,Cuilan Zhang,Binghan Zhang,Dandan Han,Longwei Du,Lishun Wu
Blast furnace slag (BFS) is a kind of waste produced in industrial production, as well as a valuable secondary resource. In this paper, layered double hydroxides composites (BFS/LDHs) were prepared by aqueous polymerization, with industrial waste BFS as modifier and magnesium nitrate, aluminium nitrate, and urea as raw materials. BFS/LDHs have been characterized by using scanning electron microscopy (SEM), fourier infrared spectrometer (FT IR), x-ray diffraction (XRD), and the specific surface area analyser (BET). The adsorption of BFS/LDHs on Cu (II) and methylene blue (MB) was investigated by batch experiments. The results showed that the adsorption capacity of BFS/LDHs to Cu (II) is stronger than that of MB. What’s more, the solid concentration effect was found in the process of sorption kinetics and sorption isotherms. The sorption kinetics curves of Cu (II) and MB on BFS/LDHs were well fitted by the quasi-second-order kinetics under different adsorbent concentrations. Langmuir and Freundlich sorption isotherm models were used to analyse the adsorption. It showed that the adsorption conforms to Langmuir and Freundlich’s adsorption isotherm models. The BFS/LDHs composites have good recycling availability in this adsorption process of Cu (II) and MB, the removal capacity of which was reduced by 16.1% and 3.8% after being recycled for six times, respectively. More importantly, BFS/LDHs composites are not only expected to become a sewage treatment agent, but also to solve the problem of industrial waste treatment, which is a win–win strategy.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CORROSION ENGINEERING SCIENCE AND TECHNOLOGY
·
2023
·
IF 1.8
Yingxue Liu,Huijie Huangfu,Shuai Gao,Xugeng Guo,Li Wang
Herein, we prepare two types of MgAl-LDHs coatings single-doped by imidazolium ionic liquid 1-decyl-3-methylimidazolium bromide ([Demim]Br) or sodium dodecylbenzenesulphonate (SDBS) and double-doped by [Demim]Br and SDBS on AZ31B Mg alloy by using an in-situ hydrothermal treatment. Their surface morphology and corrosion resistance immersed in 3.5 wt-% NaCl solution are explored. Our results suggest that the double doping of [Demim]Br and SDBS will change the surface morphology of the coating and a uniform and dense film is observed in the double-doped MgAl-LDHs, which is denser than those of the two single-doped MgAl-LDHs coatings, thus providing a superior corrosion resistance. Such an improvement can be ascribed to the synergetic inhibition effect of [Demim]Br and SDBS against the corrosion of the Mg alloy substrate. More importantly, the charge transfer resistance of the sample coated with the double-doped MgAl-LDHs is still high after 3 d of immersion, benefiting from the excellent self-healing effect.
✓ 已验证
DOI
高影响因子
RSC Advances
·
2026
·
IF 6.1
Jinxin Fang,Hongli Guo,Chenling Xu,Shiyu Wang,Daoxiang Jiang,Qin Huang,Bao Yu,Weiguo Cao,Haijun Huang
Heavy metal contamination in traditional Chinese medicines (TCMs) and their preparations is an urgent quality and safety issue to be addressed in the industrialization of TCMs. Herein, a novel magnetic composite of MgAl-LDHs@FRBCs/Fe 3 O 4 was prepared as the adsorbent, which was fabricated by using the leaves ( Isatidis Folium ) and roots ( Isatidis Radix ) of Isatis indigotica as the carbon source for biochar (FRBCs), followed by in situ growth of MgAl-layered double hydroxides (MgAl-LDHs). In the aqueous extract of Ligusticum chuanxiong Hort. (CX), the composite exhibited high simultaneous removal efficiencies for multiple heavy metal ions: 96.53% for Pb 2+ , 78.49% for Cu 2+ , 83.82% for Cd 2+ , and 35.48% for Ni 2+ . The adsorption process fitted better with the pseudo-second-order (PSO) kinetic model and Langmuir isotherm, indicating that the adsorption was dominated by monolayer chemisorption. Meanwhile, a certain correlation with the pseudo-first-order (PFO) kinetic model was also observed, reflecting the participation of the physisorption. Thermodynamic parameters (Δ H = 25.84–105.42 kJ mol −1 , Δ S = 122.15–386.15 J mol −1 K −1 , Δ G = −17.37 to −9.65 kJ mol −1 ) confirmed a spontaneous and endothermic process with increased disorder. Further mechanism investigation by pH-dependent experiments, zeta potential measurements, and XPS revealed that the adsorption occurred mainly through electrostatic interactions and chemical complexation. Importantly, HPLC analysis revealed no significant alteration of the major bioactive components in the CX extract after adsorption. The composite also exhibited fast adsorption kinetics, high removal efficiency under competitive conditions, good stability and reusability, and easy magnetic separation. The current work provides a high-performance adsorbent for heavy metal removal from TCM aqueous extracts, which also offers a sustainable strategy for valorizing TCM residues. Herein, a novel magnetic composite of MgAl-LDHs@FRBCs/Fe 3 O 4 was prepared, and the adsorption performance and mechanism of this composite for multiple heavy metal ions in the aqueous extract of Ligusticum chuanxiong Hort. were investigated.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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