Materials
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2020
·Vol. 13
·期 9
·2033
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IF 3.057
Yongzhen Lei,Long Mao,Jin Yao,Zhihan Li
Poly(lactic acid) (PLA) represents one of the most promising and attractive bio-based polymers for green packaging. However, toughness, gas barrier and antibacterial properties of pure PLA films cannot compete with those of traditional petroleum-based active packaging plastics. To fill this gap, utilization of excellent chelating properties of phytic acid (PA), functionalized layered double hydroxides (LDHs@PA-Cu(II)) was firstly synthetized via facile deposition and chelation of one-step assembled PA-Cu(II) coordination compounds on the surface of layered clay. Furthermore, LDHs@PA-Cu(II)/PLA nanocomposites were prepared by blending LDHs@PA-Cu(II) and pure PLA via solution casting evaporation process. After adding only 1 wt % LDHs@PA-Cu(II), elongation at break and tensile strength increase by 53.0% and 18.9%, respectively, and the oxygen relative permeability decreases by 28.0%. Due to the strong interface interaction and heterogenous nucleation, the reinforcement effect of LDHs@PA-Cu(II) at low loadings is remarkable. Meanwhile, owing to the antibacterial activity of PA-Cu(II) coatings, the antibacterial rate (against Escherichia coli) of LDHs@PA-Cu(II) exceeds 99.99%. Furthermore, the corresponding LDHs@PA-Cu(II)/PLA nanocomposites also show outstanding antibacterial properties, which will be a promising candidate for active packaging application.Keywords:layered double hydroxides;phytic acid;antibacterial activity;polylactic acid;barrier properties
研究领域:
材料科学
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生物医学工程
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DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
·
IF 7.489
Jin Hu,Shengli Zhu,Yanqin Liang,Shuilin Wu,Zhaoyang Li,Shuiyuan Luo,Zhenduo Cui
Low-cost, highly active and earth-abundant bifunctional electrocatalyst is very important for the large-scale hydrogen production by water splitting. In the present work, we report a novel two-step method to fabricate three-dimensional (3D) porous catalyst for water splitting. The Ni 3 Se 2 nanowires are in-situ formed on Ni foam (NF) by simple hydrothermal method , subsequently NiFe layered double hydroxid (NiFe-LDH) nanosheets vertically grow on the nanowires to form core-shell structure. The as-formed Ni 3 Se 2 @NiFe-LDH/NF catalyst shows 3D porous structure, which can provide large specific surface area and effective substance transfers. The tight bonding between Ni 3 Se 2 nanowires and NiFe-LDH nanosheets ensures good electron transfer . The Ni 3 Se 2 @NiFe-LDH/NF catalyst exhibits outstanding electrocatalytic property for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in an alkaline medium. The overpotentianls for HER and OER at the current density of 10 mA cm −2 in 1 M KOH are 68 mV and 222 mV, respectively. For overall water splitting, a small cell voltage of 1.55 V can achieve a current density of 10 mA cm −2 in 1 M KOH. This work provides a guidance for the rational design and development of heterostructure electrocatalysts for overall water splitting.
研究领域:
材料科学
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电化学
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Shifeng Zhao,Zilin Meng,Xin Fan,Ruisen Jing,Junshan Yang,Yifei Shao,Xijuan Liu,Mi Wu,Qian Zhang,Aiju Liu
Vermiculite supported Mg-Al layered double hydroxide (LDH@VMT) with three-dimensional hierarchical structure was successfully synthesized and the removal performance of LDH@VMT in soil was investigated for heavy metals removal (Cu 2+ , Pb 2+ , Zn 2+ and Ni 2+ ). Kinetics studies of heavy metals removal were well described by intraparticle diffusion and pseudo-second-order model. Adsorption isotherm data of Cu 2+ and Pb 2+ yielded a better accordance of Freundlich model, however, data of Zn 2+ and Ni 2+ were fitted Langmuir model well. Moreover, the different mechanisms of heavy metals removal by precipitation (Cu 2+ , Pb 2+ ) and isomorphous replacement (Zn 2+ , Ni 2+ ) were investigated and proposed, respectively. The effect of coexistence cations and column leaching experiments for practical performance assessment were also examined. The excellent removal performance suggested a promising strategy in heavy metals contaminated soil.
研究领域:
环境科学
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土壤学
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材料科学
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DOI
高影响因子
Sustainable Materials and Technologies
·
2020
·
IF 4.375
Yihao Liu,Yingying Chen,Riyue Ge,Wenxian Li,Yuan Zhang,Lingyan Feng,Renchao Che
Economic, efficient, and stable layered double hydroxides (LDHs) based oxygen evolution reaction (OER) electrocatalysts are recognized as promising substitutions of precious catalysts. While LDHs composites suffer from low intrinsic activity, which slightly impedes their wide utilization in energy conversion. Here, we demonstrate a kind of three-dimensional (3D) freestanding flower-like NiCo-LDHs materials with abundant oxygen vacancies are synthesized for electrocatalytic OER application. Simple solvent-thermal method is conducted in ethanol- N , N -dimethylformamide (DMF) mixed solution, which owns slight etching effect to obtain 3D open structures. The as-synthesized Ni 1 Co 1 -LDHs-E 1 D 1 composite (in which molar ratio of nickel‑cobalt and volume ratio of ethanol-DMF are both 1:1) is characterized with abundant oxygen vacancies on surface and ultrathin nanosheets morphology with large surface area. It exhibits a relatively low overpotential (260 mV) to drive the current density of 10 mA cm −2 with a low Tafel slope of 72 mV dec −1 , as well as high durability in alkaline solution. This work confirms an ingenious strategy for designing 3D vacancy-rich LDHs functional electrocatalytic materials.
研究领域:
材料科学
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能源化学
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DOI
高影响因子
ACS Applied Materials & Interfaces
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2018
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IF 8.097
Lixun Zhang,Shengyin Tang,Chaojin Jiang,Xiaoqian Jiang,Yuntao Guan
Agricultural nonpoint pollution has been recognized as the main source of aquatic contaminants worldwide, such as inorganic nitrogen (ION) and heavy metals (HMs). It is an important challenge to simultaneously and efficiently immobilize soil ION and HMs in farmland. Herein, we present a polyporous Mg/Fe-layered double hydroxide and biochar composite (Mg/Fe-LDH@biochar) with the efficient coadsorption capacity of ION and HMs for the mitigation of agricultural nonpoint pollution toward aquatic systems. The Mg/Fe-LDH@biochar showed strong adsorption toward ION (i.e., NH4+–N and NO3––N) and HMs (i.e., Cu, Zn, Ni, Pb, and Cd), with maximum capacity of 98.53 mg of NH4+–N/g, 27.09 mg of NO3––N/g, 295.80 of mg Cu/g, 141.70 mg of Zn/g, 75.59 mg of Ni/g, 1264.10 mg of Pb/g, and 126.30 mg of Cd/g, respectively. More attractively, by deionized water extraction, the adsorbed ION on the composite was more easily rereleased, with a desorption percentage of about 42.33 ± 6.87% NO3––N and 1.42 ± 0.78% NH4+–N, than that of HMs (<1.0%). This difference is primarily related with the strength of bonding forces of ION and HMs when adsorbed on Mg/Fe-LDH@biochar, in the sequence of NO3––N (van der Waals force and electrostatic attraction) < NH4+–N (hydrogen bonding) < HMs (ionic/coordinate bonding). Finally, to examine the performance of Mg/Fe-LDH@biochar for practical applications in farmland, column leaching experiments were successfully conducted by stimulated rainfall events. The addition of Mg/Fe-LDH@biochar into soils could greatly reduce the leaching of ION and HMs simultaneously, with reduction ratios of >60, >40, and >90% for NH4+–N, NO3––N, and HMs, respectively, at 3.0% addition. Moreover, there was no leaching risk of Fe ions into the water body from Mg/Fe-LDH@biochar-amended soils.
研究领域:
环境科学
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农业科学
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DOI
PubMed
高影响因子
Journal of Cleaner Production
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2018
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IF 5.651
Haixia Lyu,Yunxiafei Ling,Jingshuang Fan,Yiqiong Chen,Yan Yu,Zenghong Xie
A novel 1-propylene-3-methylimidazolium chloride ([AMIM]Cl) ionic liquid-functionalized Mg/Al layered double hydroxide (IL-LDH) was synthesized via a thiol-ene click reaction and applied to adsorb Congo Red (CR) from aqueous solution. The structure of the prepared adsorbent was characterized mainly using X-ray diffraction (XRD), infrared spectrum (IR), thermogravimetric analysis (TGA), and N 2 Brunauer-Emmett-Teller surface area measurements. Batch adsorption experimental factors including initial pH, the amount of adsorbent and adsorption time were investigated. Under optimal conditions, the maximum adsorption capacity of CR on IL-LDH was 288.63 mg·g −1 , which was higher than that of Mg-Al-LDHs intercalated with sodium dodecylsulfate (LDH-SDS) (90.86 mg·g −1 ). In addition, the adsorption of CR on IL-LDH had no obvious change when initial pH values were changed from 5.0 to 10.0, which indicated the adsorbent was pH-independent. Based on the above results, ionic liquid-modified layered double hydroxide may constitute a potential adsorbent for water purification .
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 Materials Chemistry A
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2018
·Vol. 6
·期 22
·10277-10285
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IF 9.931
Xueyi He,Li Cao,Guangwei He,Anqi Zhao,Xunli Mao,Tong Huang,Yan Li,Hong Wu,Jie Sun,Zhongyi Jiang
Layered double hydroxides (LDH), bearing trivalent cationic charge centers and hydroxyl slabs, hold great promise for use in efficient solid-state ion conductors. In this study, a composite membrane with ion-conducting 2D channels was prepared based on exfoliated LDH nanosheets and quaternized polyvinyl alcohol via a filtration process. The LDH laminates, which were formed by the stacking of exfoliated LDH nanosheets, primarily afforded the conductive performance of the membranes. Within the intra-laminate galleries of LDH, charge-balancing anions determined the channel size, water absorption capacity and electrostatic interactions inside the 2D channels. As a result, hydroxide ion transport was greatly affected by the anionic species present. The organic moieties inside the inter-laminate galleries of LDH conferred hydrogen bonds and covalent linkages at the organic–inorganic interfaces, resulting in a nacre-mimetic structure, leading to the improved mechanical properties of the composite membranes. The synergistic manipulation of composition and interactions within the intra- and inter-laminate galleries endowed the novel anion conductors with both high conductivity (156.3 mS cm−1 at 80 °C) and good mechanical performance (a tensile strength of 48.4 MPa and toughness of 2.09 MJ m−3).
研究领域:
材料科学
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化学工程
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2019
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IF 5.107
Qiuling Ma,Li-chao Nengzi,Bo Li,Zhongjuan Wang,Lichen Liu,Xiuwen Cheng
Activated carbon coated with CoFe layered double hydroxide (AC@CoFe-LDH) as an efficient catalyst of activating persulfate (PS) for the degradation of lomefloxacin (LMF) was successfully prepared and characterized. Various effects of reaction parameters on LMF degradation including PS dosage, catalyst concentration, initial pH and temperature were systematically studied. Results indicated that AC@CoFe-LDH nanocomposites exhibited ultra-high activity for PS activation compared with bare AC, modified AC (AC-HCl) and CoFe-LDH, in which 93.2% of LMF could be removed within 60 min by the AC@CoFe-LDH with an AC to CoFe-LDH ratio of 1:1 activating PS. It was also found that the condition of 1 g·L −1 PS, 0.2 g·L −1 catalyst, solution pH of 5 and reaction temperature of 25 °C was optimized. In the reaction system, both SO 4 − and HO were responsible for the LMF degradation and SO 4 − was the primary one. The cycles of Fe(II)/Fe(III) and Co(II)/Co(III) were confirmed by XPS analysis which revealed the proposed mechanism for PS activation. Moreover, AC@CoFe-LDH nanocomposites with good stability and recyclability showed great potential for the oxidative treatment of organic contaminants.
研究领域:
环境科学
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催化化学
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DOI
高影响因子
Journal of Nanomaterials
·
2014
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IF 1.611
Shifeng Li,Yanming Shen,Min Xiao,Dongbin Liu,Lihui Fan,Zhigang Zhang
Controlled release formulations have been shown to have potential in overcoming the drawbacks of conventional plant growth regulators formulations. A controlled-release formulation of 1-naphthylacetic acid (NAA) and indole-3-butyric acid (IBA) simultaneous intercalated MgAl-layered double hydroxides (LDHs) was prepared. The synthetic nanohybrid material was characterized by various techniques, and release kinetics was studied. NAA and IBA anions located in the gallery of MgAl-LDHs with bilayer arrangement, and the nanohybrids particles were of typical plate-like shape with the lateral size of 50–100 nm. The results revealed that NAA and IBA have been intercalated into the interlayer spaces of MgAl-LDHs. The release of NAA and IBA fits pseudo-second-order model and is dependent on temperature, pH value, and release medium. The nanohybrids of NAA and IBA simultaneously intercalated in LDHs possessed good controlled release properties.
研究领域:
植物学
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材料科学
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农业科学
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2016
·Vol. 133
·期 39
·
IF 1.866
Yu Zhao,Nana Li,Fangzhu Yuan,Haiding Zhang,Shengji Xia
Zn–Al layered double hydroxide (LDH)-entrapped poly(ether sulfone) (PES) ultrafiltration membranes with four different weight percentages, 0.5, 1.0, 2.0, and 3.0%, were prepared by a phase-inversion method. Characterization by scanning electron microscopy, atomic force microscopy and contact angle (CA), equilibrium water content, porosity, average pore size, mechanical strength, and ζ potential measurement were used to evaluate the morphological structure and physical and chemical properties of membranes. Static protein adsorption, filtration, and rejection experiments were conducted to study the antifouling properties, water permeability, and removal ability of the modified membranes. The results show that significant change occurred in the membrane morphology and that better hydrophilicity, water permeability, and antifouling ability were also achieved for the PES/LDH membranes when a proper amount of LDH was used. For example, the CA value decreased from 66.60 to 50.21°, and the pure water flux increased from 80.21 to 119.10 L m −2 h −1 bar −1 when the LDH loading was increased from 0 to 2.0 wt %. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43988.
研究领域:
材料科学
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环境工程
·
膜技术
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DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
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2017
·
IF 4.217
Qiang Huang,Jiao Zhao,Meiying Liu,Junyu Chen,Xiaoli Zhu,Ting Wu,Jianwen Tian,Yuanqing Wen,Xiaoyong Zhang,Yen Wei
The MgAl-layered double hydroxide (LDH) was modified with polyethylene polyamine (PP) and tannic acid (TA) to improve the adsorption property of heavy metal ions. The PP@TA encapsulated LDH (denoted as LDH-PP@TA) was prepared via the combination of catechol chemistry and Michael addition and/or Schiff base reaction and characterized through TEM, FT-IR, SEM, TGA, and XPS. The adsorption performance was investigated by using LDH-PP@TA as adsorbent to adsorb the copper (II) ions from aqueous solution. The effect of contact time, solution pH, initial copper (II) ions concentration and temperature were investigated. The LDH-PP@TA exhibited high adsorption capacity of 41.56 mg/g, which is almost double that by LDH (23.39 mg/g). Equilibrium data for adsorption of copper (II) ions on adsorbents could be well fitted by the pseudo-second-order and Langmuir equations. Thermodynamic studies show the adsorption process is spontaneous and endothermic. Electrostatic adhesion and formation of copper complex are the major mechanisms for the copper (II) ions removal by LDH-PP@TA. These results reveal the great potential of LDH-PP@TA in the application of heavy metal ions removal.
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 CHEMICAL AND ENGINEERING DATA
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2017
·
IF 2.323
Hanjun Wu,Hongyu Gao,Qinxue Yang,Huali Zhang,Dongsheng Wang,Weijun Zhang,Xiaofang Yang
In this work, the calcined chitosan (CS)-supported layered double hydroxides were prepared, characterized, and further applied to remove organic contaminants in aqueous solution. The chitosan-supported layered double hydroxide calcined at 400 °C (CSLDO400) was found to be effective for the adsorption of azo dye and antibiotic. CSLDO400 showed excellent adsorption performance at a wide pH range from 5 to 9 for methyl orange (MO) while the adsorption of tetracycline (TC) was most efficient at a pH of 9, and the optimal CSLDO400 dosages were 0.175 g L–1 for MO and 0.375 g L–1 for TC. The divalent and trivalent anions have a great effect on removal efficiency of MO and TC, while the effect of monovalent anions adsorption can be neglected. The adsorption kinetics indicated that the MO and TC removal followed the pseudo-second-order model. In addition, it can be fitted well with both the Langmuir and Freundlich model for MO and TC at 298 K, respectively. The adsorptions of MO and TC on CSLDO400 were both spontaneous and endothermic. After five adsorption–desorption cycles, CSLDO400 still showed high efficiency with an adsorption capacity of 60.72 mg g–1 for MO and 21.92 mg g–1 for TC. Therefore, the CSLDO400 are promising for use in the treatment of drinking water and wastewater contaminanted by organic matters.
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
危险品化学品经营许可证（带存储）