Materials
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2019
·Vol. 12
·期 12
·1968
·
IF 2.972
Ying Sun,Rongping Yun,Yufeng Zang,Min Pu,Xu Xiang
Lithium extraction from salt lake brine is critical for satisfying the increasing demand of a variety of lithium products. We report lithium recovery from pre-synthesized LiAl-layered double hydroxides (LDHs) via a mild solution reaction. Lithium ions were released from solid LiAl-LDHs to obtain a lithium-bearing solution. The LiAl-LDHs phase was gradually transformed into a predominantly Al(OH)3phase with lithium recovery to the aqueous solution. The lithium recovery percentage and the concentration of the lithium-bearing solution were dependent on the crystallinity of LiAl-LDHs, the initial concentration of the LiAl-LDHs-1 slurry, the reaction temperature, and the reaction time. Under optimized conditions, the lithium recovery reached 86.2% and the Li+concentration in the filtrate is 141.6 mg/L. Interestingly, no aluminum ions were detected in the filtrate after solid–liquid separation with high crystallinity LiAl-LDHs, which indicated the complete separation of lithium and aluminum in the liquid and solid phases, respectively. The27Al NMR spectra of the solid products indicate that lithium recovery from the lattice vacancies of LiAl-LDHs affects the AlO6coordination in an octahedral configuration of the ordered Al(OH)3phase. The XPS O 1sspectra show that the Oadpeak intensity increased and the OLpeak intensity decreased with the increasing lithium recovery, which indicated that the Al-OH bond was gradually formed and the metal–oxygen–metal bond was broken.Keywords:lithium recovery;LiAl-LDHs;reaction-coupled separation technology;salt lake brine
研究领域:
材料科学
·
化学工程
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Chendi Ding,Yu Tai,Dong Wang,Linghua Tan,Jiajun Fu
A superhydrophobic, self-healing anti-corrosion coating was prepared by in-situ growth of tungstate corrosion inhibitor intercalated layer double hydroxides (LDHs) conversion film on the AZ31B magnesium alloy and then post-sealing a hydrophobic polymer layer of ureido crosslinked polydimethylsiloxane (U-PDMS) with laurate modified LDHs power (La-LDH) on the surface. The coverage of the dense, water-repellent top layer could suppress the penetration of electrolyte into the bottom LDHs layer and preserve the intercalated tungstate inhibitor from being wasted by ion-exchange at the very beginning of immersion. The anti-corrosion performance provided by the composite film was assessed by multiple methods including, potentiodynamic polarization, open circuit potential (OCP), electrochemical impedance spectroscopy (EIS), immersion test and scanning vibrating electrode technique (SVET). The results indicate that compared to LDHs coating, the superhydrophobic composite coating shows longer term protection and faster self-healing effect, which is of great significance to expand the potential applications of magnesium alloys.
研究领域:
材料科学
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防腐蚀工程
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·
IF 5.8
Bao Siqi,Yu Xiaotong,Li Xiaolin
Antibiotic contamination has a significant negative impact on China, one of the largest producers and consumers of antibiotics worldwide. In this study, a three-dimensional flower-like structure of CoFe-LDHs was used to efficiently degrade tetracycline (TC) in a system triggered by peroxymonosulfate (PMS) and exposed to visible light. After exploring the effects of different metal ratios, catalyst dosage, initial TC concentrations, and pH, the optimal reaction conditions were determined. In comparison to pure CoFe-LDHs, the TC elimination rate was dramatically increased by the addition of the PMS. The strong environmental resistance, excellent stability and reusability, and universal flexibility were shown. The quenching experiments and electron spin resonance detection showed that the creation of reactive oxygen species was facilitated by the synergistic transmission of electrons between the active bimetallic components. Further, photogenerated holes was the dominant oxidizing species, which contributed more to the degradation of TC. The potential degradation pathways and intermediate toxicity of TC were suggested. This work offers a new method dominated by photogenerated holes for efficiently removing TC effluent.
研究领域:
环境科学
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化学
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DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2018
·
IF 6.434
Yue Meng,Xiaofeng Zhang,Guoxiang Pan,Shengjie Xia,Zheming Ni
A novel hybrid layered material–Schiff Base-Zinc Complexes intercalated ZnCr-LDHs-supported ZnO–was synthesized by one-step coprecipitation method and characterized by XRD, UV–vis DRS, SEM, TEM, BET, ICP-AES and XPS analysis. The influences of the three Zn components (intercalated between the layers, supported on the surface, distributed in the host layers of the layered material) on the crystallinity and the photocatalytic activity of ZnO/ZnCr-SalenZn-LDHs for Rhodamine B (RhB) degradation were studied in detail by orthogonal design. The results showed that the percentage of the three components has a great effect on the structure and photocatalytic performance of ZnO/ZnCr-SalenZn-LDHs. The SalenZn intercalated between the layers and the Zn distributed in the layers of the layered material were the main influencing factors, and the ZnO supported on the surface of the layered material was the secondary influencing factor. The optimum initial molar ratios were SalenZn:Cr = 0.5, Zn:Cr = 3, and ZnO:Cr = 0.75, respectively, and the photocatalytic degradation efficiency of RhB reached 96.9%. In addition, a possible mechanism of photocatalysis was discussed from the perspectives of photogenerated reactive species and photoinduced carries transfer. While, the regeneration of the best photocatalytic material was also investigated in detail.
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
ACS Applied Nano Materials
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2023
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IF 5.9
Guorong Wang,Guiquan Liu,Zhiliang Jin
Vanadium-based hydrotalcite materials have attracted much attention in supercapacitor electrodes due to their polyvalent properties. Nevertheless, the weak electrical conductivity of hydrotalcite limits its further development. In order to overcome this problem, nanoflowers P-NiV-LDHs-8 and Se-NiV-LDHs-1 were obtained by ingenious modification on the surface of nanoflower microlamellae of NiV-LDHs. Compared with Se-NiV-LDHs-x (x = 0.5, 2), P-NiV-LDHs-x (x = 4, 12), NiV-LDHs, Ni2P, and NiSe2, nanoflowers P-NiV-LDHs-8 and Se-NiV-LDHs-1 have better mass-specific capacity and corresponding rate performances. The self-assembled P-NiV-LDHs-8//AC and Se-NiV-LDHs-1//AC (AC = activated carbon) soft package devices have relatively superior energy density and power density. Moreover, the specific capacitance retention also maintains a relatively impressive level. It is proven that the interfacial modification has a positive effect on the energy storage performance of NiV-LDHs from the perspectives of phosphating and selenizing.
研究领域:
材料科学
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电化学
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DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
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2019
·Vol. 49
·期 2
·1043-1050
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IF 1.676
Jiao Yunpeng,Han Yinghui,Pang Yiheng,Zhou Junxiu,Qi Xiaohan,Liu Yunpeng
Abstract Some kinds of the plate-like hexagonal layered double complex hydroxides (named Ni-Fe-Sr-LDHs) materials were prepared for energy storage electrodes in this work. It showed good properties with energy densities and cycle life through the electrochemical tests. At 1 A g −1 current density, the specific capacitance of the electrode reached 311.02 F g −1 when the electrolyte was 6 M LiOH. In the long cycle test, the capacitance retention of the electrode maintained at 73.16% after 2000 cycles (current density: 1 A g −1 ). The morphologies of Ni-Fe-Sr-LDHs were characterized via the scanning electron microscope, transmission electron microscopy and x-ray powder diffraction. The prepared layered double hydroxides were further optimized by doping carbon nanotubes (CNTs). The optimal weight ratio of Ni-Fe-Sr-LDHs to CNTs was 3:1. The specific capacitance in the measurement of galvanostatic charge–discharge increased to 438.74 F g −1 , and the stability of long-term cycling was raised to 77.45%. These results indicated that Ni-Fe-Sr-LDHs combined with CNTs would be an ideal electrode material for practical energy storage. Graphic Abstract
研究领域:
材料科学
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电化学
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高影响因子
Materials Research Express
·
2021
·Vol. 8
·期 7
·075001
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IF 1.62
Haibin Xue,Xuewei Gao,Xiangnan Feng,Shan He,Feifei Zhao,Guiju Zhang,Xinrui Wang,Xiaobo Luo,Shanyue Guan
The developing a green and facile synthetic approach of Ag-based antibacterial nanomaterials with controlled composition, size, and shape, to acquire high antibacterial activity and long-term durability, is of vital importance and remains a challenging goal. Herein, a novel LDHs-supported Ag antibacterial nanomaterial (Ag/CoAl-LDHs) are fabricated via an in situ deposition of the Ag nanoparticles onto the CoAl-LDHs surface. X-ray diffraction pattern (XRD) and High-resolution TEM (HRTEM) measurements confirm that the uniform Ag nanoparticles (the average particle size of 16.5 nm) are highly dispersed and firmly anchored onto CoAl-LDHs surface. As revealed by x-ray photoelectron spectroscopy (XPS), the CoAl-LDHs nanoplates play the roles of both a support and a reductant without any external, and there was a redox reaction between Co2+ in LDHs layers and Ag+ in AgNO3 solution, giving rise to in situ loading of Ag nanoparticles onto LDHs. Moreover, antibacterial experiments verify that Ag/CoAl-LDHs not only have efficient antibacterial activity against both Escherichia coli and Staphylococcus aureus, but also exhibit very stable antibacterial properties for both bacteria. Therefore, this research demonstrates a successful paradigm for the rational design and preparation of new antibacterial nanomaterials with high antibacterial activity and long-term durability.
研究领域:
材料科学
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微生物学
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高影响因子
ANALYTICAL CHEMISTRY
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2024
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IF 6.7
Xinyu Fan,Yang Liu,Yongpeng Yang,Yunxiu Jia,Jingxin Yu,Fengniu Lu,Zhiqin Yuan,Chao Lu
The properties and applications of colloidal sol nanomaterials are largely affected by their crystallinity, making the rapid screening of colloidal sol crystallinity important to explore diverse advanced nanomaterials. Yet, the rational design of a novel technique for colloidal sol crystallinity analysis remains a great challenge. In this study, we synthesized an imidazole-anchored naphthalene diamine (IANA) fluorophore with a planar naphthalene motif. Using IANA as the fluorescence probe, we demonstrated the rapid and direct screening of colloidal sol crystallinity in model layered materials (cadmium–aluminum layered double hydroxides, CdAl-LDHs). The crystallinity-promoted fluorescence quenching is attributed to the crystallinity-enhanced ordered arrangement of IANA by Cd-imidazole coordination, which benefits its face-to-face π–π stacking and inhibits the absorption of ultraviolet light. Without drying treatment, this technique directly reveals the crystallinity information of colloidal sol CdAl-LDHs. In addition, the practical application of the proposed fluorescence technique is verified by accurate colloidal sol crystallinity determination of the CdAl-LDHs sample with unknown crystallinity. This work has opened a new avenue for exploring an alternative to X-ray diffraction for the rapid screening of the colloidal sol crystallinity of layered materials and even organic crystals through π–π stacking-regulated fluorescence.
研究领域:
材料科学
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化学
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DOI
高影响因子
CERAMICS INTERNATIONAL
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2024
·
IF 5.1
Jichao Zhu,Xianli Dong,Kunhao Li,Siyu Tian,Yao Kong,Weitong Chen,Shuping Zhou
In the field of pharmaceutical research and development, the development of nano drug carriers based on intercalation structures has become one of the important development directions. Hydrotalcite (LDHs) and its derivatives have the advantages of low cost, simple synthesis, high drug loading efficiency, good biocompatibility, and easy degradation, and have received widespread attention in the field of biomedicine. Based on this, we synthesized 5-aminosalicylate (5-ASA) intercalated NO 3 based and CO 3 based ZnAl-LDHs drug delivery systems using ion-exchange and chemical co-precipitation methods, respectively. The crystalline structure, morphology, thermal stability, and host-guest interaction were characterized in detail by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Ultraviolet visible spectroscopy (UV), Scanning electron microscopy (SEM), Thermogravimetric analysis (TGA) and X-ray photoelectron spectroscopic (XPS). The drug loading, drug release behavior and release kinetic of 5-ASA intercalated ZnAl-LDHs were studied. The characterization results indicated that the intercalation mode of the drug and the strength of the host-guest interaction are related to the interlayer anion type and synthesis process of ZnAl-LDHs. The amount of 5-ASA loaded into LDHs from an ion-exchange process was 28.6 and 13.8 wt% for NO 3 − and CO 3 2− based LDHs, respectively, whereas it was 6.9 and 10.4 wt% for co-precipitation process. The modeling kinetics results indicated that the release process of 5-ASA by ZnAl-LDHs intercalated with 5-ASA conforms to the parabolic diffusion model. These results indicated that the drug delivery system was controlled by diffusion of 5-ASA ions into aqueous solution through exchange with phosphate anions.
研究领域:
药学
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纳米医学
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生物材料
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DOI
高影响因子
DESALINATION
·
2025
·
IF 9.8
Jinqiang Gao,Yuqing Su,Feng Dong,Mei Hong,Shihe Yang
Lithium extraction is of paramount importance for the emerging batteries. For salt lakes or recyclable lithium-containing materials, various metal ions are unavoidable, including Na + , K + , Ca 2+ and Mg 2+ . Lithium aluminum layered double hydroxides (LiAl-LDHs), as the most mature adsorbent, have been intensively studied on adsorption capacity and stability, but the cation adsorption selectivity is confusing and sometimes contradictory. To decipher the intrinsic cation selectivity of this nanosheets adsorbent, we track the mass fluctuation using operando quartz crystal microbalance with dissipation (QCM-D) method. First, we establish this effective monitoring strategy through accurately discriminating the adsorption-desorption behavior of interference-free LiAl-LDH/LiAlFe-LDH nanosheets. Then, by combining adsorption process of metal ions and density functional theory (DFT) calculations, we determine the intrinsic ion-selectivity sequence of Li + > Mg 2+ ≫ Na + ≈ K + ≈ Ca 2+ . For ions larger than Li + (0.76 Å), a well-crystallized structure hardly adsorbs Na + (1.02 Å), K + (1.38 Å), and Ca 2+ (1.00 Å) limited by the steric hinderance. Meantime, the dehydration energy consumption of hydrated ions determines the trend of Li + > Mg 2+ . Following, the SA-LiAl-LDH (composite binder-LDH adsorbent) directly corroborates that the misleading interfacial process result from sodium alginate binder adsorption. The work ends the confusion on the intrinsic properties of LiAl-LDHs and provides a clear insight for deciphering the myriad of ion adsorption selectivity.
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高影响因子
POLYMER DEGRADATION AND STABILITY
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2016
·
IF 3.12
Xianru He,Tianxiang Li,Zhengren Shi,Xin Wang,Fei Xue,Zihong Wu,Qian Chen
NBR-based layered double hydroxide (LDH) composites were prepared using a sodium p-styrenesulfonate hydrate (SSS) modified LDH (LDH-SSS) filler through ion exchange. The modified filler, LDH-SSS, was investigated by XRD , FTIR and TGA-DTGA, showing its layered structure was successfully obtained, as compared with the unmodified LDH-NO 3 . Mechanical tests of the NBR composites showed that their thermal-oxidative aging was improved, specifically by LDH-SSS. ATR-FTIR was used to study for the aging mechanism of composites. The morphology of the composites revealed by SEM and XRD shows a stronger interaction between NBR and the LDH particles with the presence of SSS. The chemical structure and the thermal properties of the composites revealed by various techniques showed an exfoliation phenomenon of the LDH-SSS, and NBR can be branched with LDH-SSS in the aging process of the composites.
研究领域:
材料科学
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高分子化学
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DOI
高影响因子
Journal of Materials Chemistry A
·
2025
·Vol. 13
·期 41
·35727-35735
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IF 9.5
Xiaoyu Wang,Ben Ma,Xuehui Shangguan,Qinglei Wang,Ping Li,Li Su,Yi Zhao,Yufei Wei,Haixin Zhang,Jie Gao,Faqiang Li
Lithium–aluminum layered double hydroxides (Li/Al-LDHs) have achieved successful industrial-scale application in lithium extraction from salt lakes due to their excellent structural stability, high selectivity and environmental friendliness. However, they suffer from limited adsorption capacity. Herein, this issue can be effectively resolved by precise regulation of the LDH nucleation strategy, thereby controlling oxygen species content. The Li/Al-LDHs are synthesized via a one-pot precipitation method, and the nucleation conditions, including Al/Li ratio, crystallization temperature and terminal pH, are systematically optimized through crystal growth analysis, adsorption performance evaluation, and structural stability characterization. The results confirm that the adsorption capacity of Li/Al-LDHs is critically dependent on the pH value attained at equilibrium. Notably, the terminal pH simultaneously governs Al(OH)3 nucleation and Li+ intercalation through oxygen speciation control. The elevated active oxygen content (38.65%) enhances hydrophilicity (contact angle 22.5°) and strengthens lithium-ion diffusion kinetics. The density functional theory (DFT) calculation further indicates that high levels of active oxygen (37.5%) facilitate low formation energy (−3.527 eV) and adsorption energies (−0.739 eV), confirming the correlation between the structure and Li active sites. What's more, the prepared Li/Al-LDHs show outstanding lithium adsorption performance with a maximum adsorption capacity of 13.42 mg g−1 in East Taijinar salt-lake brine. The separation coefficients of Na+, K+, and Mg2+ are 395.86, 140.89, and 121.69, respectively. This study provides vital insights for advancing high-performance aluminum-based lithium adsorbents.
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高影响因子
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