Journal of Cleaner Production
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2023
·
IF 11.1
Shan Peng,Xiaoxin Chen,Xin Rong,Haobo Ma,Chenyang Zhao,Kyongjin Pang
Microplastics (MPs) are ubiquitous in aquatic and terrestrial environment, which pose serious threat to ecosystem and human health. Although many approaches have been developed, most of them showed low efficiency and long processing cycle. Herein, a cost-effective and eco-friendly coated sponge (HDTMS/CuCo-LDHs/PDA@Sponge) was successfully fabricated for the first time via the supersaturated coprecipitation methods, integrating of multistage lamellar layered hydroxides (LDHs) structure, polydopamine (PDA) adhesive layer , and hydrophobic agent. Among them, (i) the complexation of PDA can enhance the growth of CuCo-LDHs, (ii) the large surface area of CuCo-LDHs provided plentiful action sites for linkage of PDA and HDTMS molecules, thus self-strengthened the coating much more firmly, (iii) the cooperation of three buildings significantly promoted the adsorption capacity of coatings to various pollutants. The finally coated sponge showed mechanically durable, superhydrophobicity, salt tolerance, and antibacterial activity, which could efficiently and synchronously absorb MPs (polypropylene and polyethylene), dyestuff, and tiny oil, and the removal rates remained almost 100% for these pollutants. Moreover, the large-scale coated sponge (9 cm × 6 cm × 1 cm) could simultaneously adsorb almost 100% MPs (40 mg/L), Sudan Ⅲ (10 mg/L), and dodecane (20 mL/L) within 1 min. The absorption energy between the coatings and MPs were −1699 kcal/mol for PP and −932.8 kcal/mol for PE, respectively. The adsorption mechanism was ascribed to multiple forces, including electrostatic interaction, capillary attraction, hydrogen bond , p-π conjugation, Van der Waals force , lipophilicity, complexation, surface adhesion of PDA, and lipophilicity of HDTMS clusters. The developed superhydrophobic sponge will be a novel strategy to purify wastewater, especially for the high-salinity and microbial-rich marine environment.
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高影响因子
ChemistrySelect
·
2022
·Vol. 7
·期 40
·e202203035
·
IF 2.307
Yuxiu Fu,Yaming Pang,Yinan Zheng,Xiaoli Song,Liguo Gao
Graphical Photocatalysts enhance the ability to absorb low-energy photons due to the reduction of the band gap. Through the photocatalytic mechanism, it is known that when there is irradiation with light (hv) energy entering Mg 2+ -Mo 6+ -Al 3+ -MoO 4 2− -Layered double hydroxides (LDHs), highly active hole-electron pairs will be generated, and a large amount of ⋅OH will be generated after the reaction, which can completely oxidize the phenol in water into CO 2 and H 2 O. Mg 2+ -Mo 6+ -Al 3+ -MoO 4 2− -Layered double hydroxides (LDHs) materials were successfully prepared via a hydrothermal method by doping Mo 6+ in hydroxide laminates and inserting MoO 4 2− to replace the interlayer anions of LDHs materials. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM), Fourier transform infrared spectrometer (FTIRS) and ultraviolet-visible spectrophotometer (UV). The electronic density of states was calculated using the density functional theory (DFT) of Vienna Ab-initio Simulation Package (VASP). The effects of Mo 6+ and MoO 4 2− on the structure, morphology, electronic structure and photocatalytic performance of Mg 2+ -Al 3+ -LDHs were systematically studied. The conditions for phenol degradation by Mg 2+ -Mo 6+ -Al 3+ -MoO 4 2− -LDHs were optimized by single factor analysis and response surface methodology. The results show that the MoO 4 2− anion reduces the band gap width and thus enhances the absorption of low-energy photons. The interaction between cations and anions enhances the photocatalytic performance. When the dosage of Mg 2+ -Mo 6+ -Al 3+ -MoO 4 2− -LDHs was 0.03 g, the temperature was 40 °C and the visible light irradiation was 15 min, the removal rate of phenol reached 94.76 %.
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Water Supply
·
2022
·Vol. 22
·期 8
·6603-6614
·
IF 1.768
Zhang Fengrong,Zhang Binghan,Han Dandan,Fang Shaokang,Wu Lishun,Hou Wanguo
Using Al(OH) 3 and Mg(OH) 2 as raw materials, MgAl layered double hydroxides (LDHs) modified from birch leaves were prepared by the ball-milling–hydrothermal method, denoted as LDHs/BL, and used for the treatment of wastewater containing Cu(II). The morphology, crystal shape, and specific surface area of the samples were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and BET-specific surface area analyzer. The results showed that the prepared LDHs/BL composites had good crystal shape, large specific surface area, and suitable pore structure. Langmuir and Freundlich adsorption isotherm models were used to analyze the adsorption. The results showed that the adsorption conforms to the Freundlich adsorption isotherm model. Under the same adsorption conditions, the adsorption capacity of the LDHs/BL complex was higher than that of LDH, the removal efficiency of the former was 92%, and that of the latter was 68%. The adsorption mechanism includes metal precipitation and isomorphic replacement. More importantly, this study provides a green method to prepare LDHs. LDHs/BL composites are expected to be used as a new kind of environmental adsorbent for wastewater treatment. This work provides a new idea for the utilization of agricultural and forestry wastes. Nanocomposites of LDHs/BL were fabricated. The LDHs/BL nanocomposites exhibit enhanced sorption capacities for Cu(II). The nanocomposites are potential sorbents for wastewater treatment. The synthesis of LDHs/BL nanocomposites provides a win–win strategy.
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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纳米技术
·
废弃物管理
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高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Xiaoqing Li,Min Zuo,Ziwei Lan,Fengling Jiang,Dickon H. L. Ng,Jia Li
C/OVs-Ni-Cu-LDHs@MnO2 tubular micromotors with enzyme-like activity and abundant oxygen vacancies (OVs) were synthesized hydrothermally using kapok as a biotemplate. MnO2 acted as the micromotor’s “driving engine”, catalyzing the generation of H2O2 bubbles to provide driving force for the motor, enabling efficient motion (144.45 ± 3.97 μm/s in 5% H2O2). The micromotors also exhibited enzyme-like activity, oxidizing 3,3′,5,5′-tetramethylbenzidine (TMB) via reactive radicals. A sensor for the colorimetric detection of GLY (lowest detection limit 0.63 μM) was developed by utilizing the enzyme inhibition induced by Cu2+-glyphosate (N-(phosphonomethyl)glycine, GLY) chelation. Meanwhile, the micromotor catalyzes H2O2 and activates peroxymonosulfate (PMS), efficiently generating hydroxyl radicals (•OH), superoxide radicals (O2•–), and single-linear oxygen (1O2). Under the synergistic effect of self-driven propulsion and efficient catalysis, achieving 93.71% GLY degradation in 40 min. This study provides an intelligent strategy for developing dynamic sensors with dual functions of simultaneous detection and degradation of GLY.
研究领域:
纳米技术
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材料科学
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环境科学
·
分析化学
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化学工程
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PubMed
高影响因子
Nanoscale
·
2025
·
IF 5.1
Zhiqun Bai,Ruoxuan Guo,Jingwang Kuang,Huifang Chen,Weihao Sha,Ao Xie,Jingchao Liu,Pingyu Wan,Yang Tang
Water splitting is a critical technology for renewable energy conversion and storage. The slow anodic process dynamics with high overpotential greatly limited the commercialization of electrolytic hydrogen production. Herein, we proposed an electrochemical in-situ etching method to achieve Molybdenum component controlled dissolved of ultra-thin NiFeMo layered double hydroxides(LDHs) nanosheet arrays on nickel-iron foam (NFF) to create in-situ reconstructed oxygen evolution reaction (OER) active sites in LDHs. The Mo-etched material exhibited significantly enhanced catalytic performance and demonstrated exceptional OER activity in alkaline media, achieving a low overpotential of 288 mV at 10 mA cm⁻² and 784 mV at 1000 mA cm⁻², along with a desired Tafel slope of 43.52 mV dec-1. The enhanced reaction kinetics is contributed by Mo doping-induced electronic structure optimization and interfacial stabilization. Furthermore, an assembled alkaline electrolyzer with NiFeMo/NFF maintained a stable electrolysis voltage (1.695±0.022 V) under simulated industrial fluctuating conditions (30 wt% KOH, 85℃, 3000 A m⁻²) for 210 hours, exhibiting a super low voltage decay rate(0.1 mV h-1). The superior performance-stability properties of new catalyst display new material design strategies for efficient industrial hydrogen production systems.
研究领域:
材料科学
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电化学
·
能源转换
·
催化化学
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Xinming Wu,Bin Huang,Qiguan Wang,Yan Wang
The application of two-dimensional layered hybrid materials in supercapacitor electrodes has high energy density. However, the hybrid assembly and electrochemical energy storage mechanism of multifarious layered electrode materials are still unclear. In this work, a two-dimensional interstratification assembly hybrid electrode by using electrostatic assembly between MXene modified with cetyl trimethylammonium bromide cation (CTAB) and NiCo-LDHs modified with dodecyl benzene sulfonic acid anion (DBS) is presented. As a result, the self-restacking of MXene and NiCo-LDHs nanosheets are effectively prevented, leading to a regular interstratification structure and large interlayer spacing, which accelerate diffusion of electrolyte ions and possess more electrochemical activity sites. The freestanding MXene/NiCo-LDHs electrode displays a much higher specific capacitance of 1207 F g −1 at a scan rate of 0.5 A g −1 , an impressive rate capability with 93% capacitance retention after 5000 cycles. Moreover, it shows maximum energy density of 107.3 Wh kg −1 (98.5 mWh cm −3 ) at a power density of 571 W kg −1 (524 mW cm −3 ), which is among the highest values reported for MXene and NiCo-LDHs based materials in aqueous electrolytes. This significant electrochemical performance is mainly attributed to hydration of two-dimensional electrodes and exchange or adsorption of interlayer anion-cation.
研究领域:
材料科学
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电化学
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储能
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纳米材料
·
超级电容器
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高影响因子
ELECTROCHIMICA ACTA
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2016
·
IF 4.803
Kai Zhang,Wenhai Wang,Long Kuai,Baoyou Geng
High-efficient catalysts for oxygen evolution reaction (OER) are crucial to energy storage and conversion between electricity and chemicals. This work proposes a facile co-reduction and subsequent co-oxidation strategy to gram-scale preparation of composition-controllable LDHs nanosheets by a case study of Ni-Fe LDHs. Different from the traditional coprecipitation method, this process does not need heating and pH control. More importantly, our method can make sure that the Ni-Fe proportion in the LDHs products is well consistent with that in the mother solution. Furthermore, the electrocatalytic OER results strongly demonstrate that the as-prepared Ni-Fe LDHs possess a top-scale activity toward OER in alkaline media, typically for the Ni 6 Fe 4 -LDH nanosheets with water oxidation overpotential as low as 0.24 V at a current density of 20 mA/cm 2 . Besides, it presents excellent stability during the endurance test. Therefore, the co-reduction and subsequent co-oxidation strategy is an highly efficient way to LDHs nanosheets for electrochemical applications.
研究领域:
材料科学
·
电化学
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高影响因子
Journal of Cleaner Production
·
2017
·
IF 5.715
Jie Tang,Bin Mu,Li Zong,Aiqin Wang
Magnetic attapulgite/carbon supported NiFe layered double hydroxides (APT/C@NiFe-LDHs) were fabricated based on the spent bleaching earth via a facile and green hydrothermal approach. Multiple characterizations were conducted to illustrate that NiFe-LDHs was successfully anchored on the surface of APT during the preparation process. The magnetic response and adsorption properties of as-prepared composites could be facilely controlled by varying the Ni/Fe molar ratio . As expected, the coating of NiFe-LDHs significantly increased the adsorption ability to pollutants, the resultant composites prepared at the Ni/Fe molar ratio of 1:1 exhibited excellent adsorption capacities for methylene blue , Pb(II), and chlortetracycline hydrochloride of 271.28, 180.90, and 308.21 mg/g, respectively. The high adsorption capacity of the obtained adsorbents could be ascribed to the synergetic effect of the carbon species and NiFe-LDHs. In addition, the adsorbent could be easily separated by magnetic separation technology, and exhibited a stable recyclability after six adsorption-desorption cycles. This work provided a feasible pathway to design and fabricate adsorption materials for wastewater treatment taken into account both high-performance adsorption and cost-effective way.
研究领域:
环境科学
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材料科学
·
化学工程
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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).
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高影响因子
Journal of Magnesium and Alloys
·
2022
·
IF 11.813
Xinfang Zhang,Ruihong Li,Xiaoyan Feng,Xue Pang,Xu He,Zili Jin,Huiping Ren,Dashuang Wang,Kailin Li,Xingjian Dai,Zhilan Du,Quan Zhou,Yuxin Zhang
A hierarchical superhydrophobic Al-Li layered double hydroxide (LDH) films with different Li + /Al 3+ molar ratios of 1:1, 1:2, 2:1, pH value of 11.5 and reaction temperature of 125 °C, have been fabricated on the surface of Mg-5Li-1Al (LA51) alloys by hydrothermal method following the characteristics of controllable cation structure and exchangeable anion between layers. The properties of the films were investigated by X-ray diffractometer (XRD), scanning electron microscope (SEM) and energy dispersive spectrometer (EDS). XRD and SEM results indicate that the Al-Li LDH films are successfully prepared on LA51 alloys. The contact angle (CA) was measured to be about 100.7°, indicating that the surface wettability of the film converted from hydrophilic to hydrophobic by surface modification. The corrosion resistance of Al-Li LDH films was evaluated by Tafel polarization curve and electrochemical impedance spectroscopy (EIS). Surprisingly, Tafel polarization curve and EIS test reveal that the Al-Li LDH films prepared at the molar ratio of Li + /Al 3+ 1:2, pH 11.5 and temperature 125 °C have better corrosion resistance in 0.1 M NaCl neutral solution. In addition, the formation mechanism and corrosion mechanism of the films on the surface of LA51 alloy are also proposed. It provides innovative synthetic materials and novel design ideas for the preparation of high-efficiency anti-corrosion coatings on LA51 alloys, whose application can be extended in industrial fields.
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Science China-Materials
·
2022
·Vol. 65
·期 7
·1805-1813
·
IF 8.64
Wang Yuchen,Liu Yaoyu,Zhang Man,Liu Biying,Zhao Zhiyue,Yan Kai
Nickel-based layered double hydroxides (LDHs) are promising electrode materials in the fields of energy storage (supercapacitors) and conversion (urea oxidation). The rational construction of atomic and electronic structure is crucial for nickel-based LDHs to realize their satisfactory electrochemical performance. Herein, we report a facile, ecofriendly, one-step synthesis process to construct petal-like oxygen-deficient NiAl-LDH nanosheets for hybrid super-capacitors (HSCs) and urea oxidation reaction (UOR). The asprepared NiAl−LDH nanosheets with rich oxygen vacancies possess a large specific surface area of 216.6 m 2 g −1 and a desirable electronic conductivity of 3.45 × 10 −4 S cm −1 to deliver an ultra-high specific capacitance of 2801 F g −1 (700 C g −1 ) at 1 A g −1 . Furthermore, high specific energy of 50.0 W h kg −1 at 400 W kg −1 and excellent cycle stability with 91% capacitance retention after 10,000 cycles are achieved by the NiAl-LDHs/CFP (carbon fiber paper) (+)//YP-80F (a commercial activated carbon) (−) HSC. Besides, NiAl−LDH nanosheets also work as an efficient electrocatalyst for UOR, which only requires 1.42 V vs. reversible hydrogen electrode to drive 10 mA cm −2 in 1 mol L −1 KOH with 0.33 mol L −1 urea. This remarkable performance is superior to most reported values of previous candidates owing to the thin structure of NiAl−LDH nanosheets for exposing more active sites and abundant oxygen vacancies. In addition, various reaction parameters are investigated to optimize the electrochemical performance. In general, this work paves a new way for the architecture of multifunctional nanostructured energy materials.
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高影响因子
HYDROMETALLURGY
·
2022
·
IF 4.217
Jun Li,Qinglong Luo,Mingzhe Dong,Guoliang Nie,Zhong Liu,Zhijian Wu
Powder Li/Al-layered double hydroxides (LDHs) of Li 2 Al 4 (CO 3 )(OH) 12 ·3H 2 O were hydrothermally synthesized in one pot with sodium alginate as a structure modifier and granulated by crosslinked sodium alginate. The powder and granulated Li/Al-LDHs lithium adsorbents were characterized by FT-IR spectroscopy, XRD, SEM, TEM, XPS, and porosity. The adsorption-desorption performance of the granulated Li/Al-LDHs adsorbents was evaluated. Adsorption isotherm , adsorption kinetics , adsorption thermodynamics were investigated. The effects of solution pH, temperature, and the electrolytes (NaCl, Na 2 SO 4 , MgCl 2 , and KCl) on lithium adsorption, and the dissolution of granulated Li/Al-LDHs adsorbents after cyclic adsorption-desorption were also investigated. The granulated Li/Al-LDHs adsorbed 14.5 mg/g of lithium from the brine of East Taigener Salt Lake with a lithium concentration of 1400 mg/L. The granulation of powder Li/Al-LDHs by crosslinked alginate greatly reduced the dissolution of powder Li/Al-LDHs. The granulated Li/Al-LDHs adsorbents prepared in this report are promising materials for Li + extraction from salt lake brines.
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