Materials Research Express
·
2021
·Vol. 8
·期 3
·035501
·
IF 1.62
Chao Li,Guodong Zeng,Min Zhou,Yang Fang,Zongwu Chen,Yishen Xu,Siyin Ding,Miao Yuan,Hao Li,Shaopeng Wu
Combination of styrene-butadiene-styrene (SBS) polymer and layered double hydroxides (LDHs) has commonly applied in asphalt to improve anti-ultraviolet aging performance, but it can not afford the reparation of cracks caused by aging of asphalt. Also, few researches focused on the structure and performance changes during synthesis of LDHs. Based on self-healing performance of asphalt, the produced cracks can be repaired by microwave heating. Therefore, the controllable synthesis of traditional microwave absorber SiC to wrap LDHs (SwL) at different temperatures was studied in this paper, and the effects of different SBS/SwL combination on the microwave absorption and exothermic properties of modified asphalt were studied. The SwL was firstly synthesized at 200 °C, 350 °C, 500 °C and 650 °C. Then morphology, phase composition, chemical structure of different SwL were evaluated. Finally, based on different combination of SBS and SwL, the effects of SBS/SwL on the microwave absorption in the frequency band from 1 GHz to 18 GHz and exothermic characteristics at 2.45 GHz of the modified asphalt were analyzed. The results show that SwL can be synthesized successfully, and the processing temperature significantly affects the structure of SwL. The SBS/SwL-200 modified asphalt has the best microwave absorption and exothermic properties. When used in self-healing asphalt, it is more advantageous to choose 200 °C as the synthesis temperature of SwL.
研究领域:
材料科学
·
土木工程
·
化学工程
✓ 已验证
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2021
·
IF 5.467
Tiantian Dai,Ziying Yuan,Yue Meng,Bo Xie,Zheming Ni,Shengjie Xia
Z–scheme heterojunction has the advantages of high carrier separation efficiency and strong oxidation ability, which is a potential material for photodegradation . In this paper, CdS@Zn,Cr-layered double hydroxides (CdS@LDHs) Z–scheme heterojunction was synthesized and used for photocatalytic degradation of tetracycline (TC). The effects of the amount of catalyst, pH value of the solution, initial concentration of TC, light intensity , and reaction temperature were studied. The degradation kinetics and mechanism were also discussed in detail. Under the optimal conditions (initial concentration of TC 50 mg/L, pH 9, light intensity 500 W, the amount of the catalyst 25 mg, and reaction temperature 45 °C), the highest removal percentage and the corresponding activity of CdS@LDHs was 93.04% and 37.09 mg g −1 h −1 , respectively. In addition, DFT calculation confirmed the existence of built–in electric field (BIEF) in the heterojunction, which promotes the electron transfer from CdS to LDHs. The amount of electron transfer was accelerated, and the recombination of electron and hole was obviously inhibited, so that they were more involved in oxidation and reduction. Thus, it makes CdS@LDHs heterojunction as a highly efficient catalyst for photodegradation of TC.
研究领域:
环境科学
·
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Yang Wang,Lei Zhang
In this paper, we report a new type of 3D ZIF-8@NiAl-LDHs micro-flowers material consisting of sandwich-like structured 2D nanopetals (highly compact ZIF-8 film anchored on both sides of petals). ZIF-8 was successfully incorporated into NiAl-LDHs (ZIF-8@NiAl-LDHs) via seeding strategy directed growth of ZIFs on the surface of LDHs nanopetals. The coating of ZIF-8 significantly increased the adsorption ability to organic pollutants and inorganic cation. 3D ZIF-8@NiAl-LDHs with excellent enrichment and filtration properties has been exploited for the application in water purification, and exhibit superior high adsorption rate and adsorption efficiency of organic (nonsteroidal anti-inflammatory drugs: ketoprofen, flurbiprofen, indometacin and ibuprofe; anionic dyes: congo red, orange g; cationic dyes: methylene blue, rhodamine b) and inorganic cation (Cu 2+ , Pb 2+ ) residues due to their novel hierarchical and submicroscopic structures. Further, 3D ZIF-8@NiAl-LDHs as filter membrane to extraction four kind of trace anti-inflammatory drugs followed by direct quantification detection of targets with HPLC was demonstrated. The validated method was successfully applied for analysis of four anti-inflammatory drugs in environmental water and human urine samples. This work provided a feasible way to design and construct purification materials for wastewater treatment and contaminant detection.
研究领域:
环境科学
·
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Huixuan Zhang,Li-chao Nengzi,Zhongjuan Wang,Xinyi Zhang,Bo Li,Xiuwen Cheng
Advanced oxidation methods based on photocatalysis and sulfate radicals have attached most interest towards contaminant degradation. However, there are a lack of coupling two methods in the field of pollutant degradation . In the present study, a new Bi 2 O 3 /CuNiFe LDHs composite was fabricated and it could efficiently activate persulfate (PS) for lomefloxacin (LOM) decomposition under simulated sunlight, in which 84.6% of LOM (10 mg·L −1 ) was degraded over 40 min with 0.4 g·L −1 of Bi 2 O 3 /CuNiFe LDHs composite and 0.74 mM of PS at natural pH. In addition, the Bi 2 O 3 /CuNiFe LDHs composite possessed good reusability and stability at least four runs. Moreover, active radical scavenging experiments indicated that hydroxyl radicals (HO·), sulfate radicals (SO 4 · − ), superoxide radicals (O 2 · − ) and hole (h + ) were the main radicals under LOM degradation process. Subsequently, the possible degradation intermediates were determined and the decomposition pathways were put forward. At the same time, activated sludge inhibition experiments were performed to assess the variation of toxicity of LOM and its degradation intermediates during oxidation. Finally, possible reaction mechanism of Bi 2 O 3 /CuNiFe LDHs composite for PS activation under simulated sunlight was proposed.
研究领域:
环境科学
·
光催化材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Yuan Bai,Weiting Huang,Jie Liu,Kexin Hu,Haoyu Zheng,Xintong Shen
The removal of dye pollutants from water bodies is a significant global issue due to their negative effects on both ecosystems and human health. For this purpose, effective and selective α-FeOOH-Fe3O4@Chitosan-LDHs@Lipase (MF@CS-LDHs@LIP) magnetically bionanomaterials were synthesized via co-precipitation and cross-linking methods for uptake of Congo red (CR) from wastewater. Comprehensive characterization of both the carrier and MF@CS-LDHs@LIP was performed using SEM, FTIR, XRD, BET, VSM, and EDX. The analytical results confirmed the successful immobilization of lipase on the composite carrier. The immobilization conditions and enzymatic properties of the enzyme were investigated. The results demonstrated that the immobilized lipase maintained over 60% relative activity within a pH range of 7.0–11.0. Notably, at pH 11.0, its activity was 1.69 times higher than that of free lipase. Both immobilized and free lipase exhibited significant activity reduction at temperatures exceeding 40 °C. At 55 °C, the immobilized lipase exhibited 2.32 times higher relative activity compared to its free counterpart. However, after five reuse cycles, the immobilized lipase retained 40.30% of its initial activity. Furthermore, after being stored at 4 °C for 30 days, the relative activity of immobilized lipase was slightly higher than that of free lipase, approximately 24.32% and 14.81%, respectively. The adsorption kinetics and isotherm studies revealed that the adsorption process followed pseudo-first-order kinetic and the Temkin isotherm model. A maximum adsorption capacity of 87.82 mg/g was present in CR solution at 25 °C, pH = 6.0, 420 min, 50 mg dosage, and 100 mL of an initial concentration of 120 mg/L. Furthermore, the immobilized lipase exhibited excellent reusability, maintaining a CR removal efficiency above 70% after 5 consecutive cycles.
研究领域:
环境科学
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纳米技术
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生物技术
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水处理
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酶工程
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2013
·Vol. 37
·期 8
·2509-2514
·
IF 2.966
Kun Shang,Bing Sun,Jianchao Sun,Jun Li,Shiyun Ai
A novel poly-(3-thiopheneacetic acid) coated Fe3O4@LDHs photocatalyst was prepared and used for the photocatalytic disinfection of bacteria under solar light irradiation. The influencing parameters of the photocatalytic antibacterial activity of the Fe3O4@PTAA-LDHs photocatalyst were optimized against E. coli and S. aureus. Results showed that the Fe3O4@PTAA-LDHs photocatalyst could effectively absorb ultraviolet and visible light. The antibacterial rate could achieve 99.99% when irradiated by solar light with 0.8 mg mL−1 Fe3O4@PTAA-LDHs during 140 min. Moreover, it was confirmed that the ˙OH were generated during the photocatalytic process, which was the major reason for the photocatalytic disinfection. The structural destruction of the bacteria cells that occurred during the bactericidal procedure was observed by TEM images. The novel photocatalyst could have potential applications in the related bactericidal fields.
研究领域:
环境科学
·
微生物学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Yun Ji,Zhelin Song,Yu Xu,Yanlin Zhang
In this work, typical refractory pollutant Rhodamine B (RhB) was effectively degraded by Cu-Fe LDHs/Bi 2 WO 6 composite in the photo-Fenton process. The hydrothermal synthesis of Cu-Fe LDHs/Bi 2 WO 6 composite with ethylene glycol as reductant created the multivalent coexistence of the same metal element to achieve a self-circle redox reaction between metals. The photo-Fenton process by Cu-Fe LDHs/Bi 2 WO 6 incredibly eliminated the limitation of strong acidic pH value applied in the Fenton process. ∙OH generated by Cu-Fe LDHs/Bi 2 WO 6 was 5 times that of Cu-Fe LDHs during the photo-Fenton process. The complete degradation of RhB in the photo-Fenton process under the optimal conditions of initial pH= 6, 5 mmol/L of H 2 O 2 , and 1 g/L of Cu-Fe LDHs/Bi 2 WO 6 dosage was far more than 46% of RhB degradation in the photocatalytic process and 76% of RhB degradation in the Fenton process. Cu-Fe LDHs/Bi 2 WO 6 composite exhibited the excellent redox ability, electron transfer ability and reusability during the photo-Fenton process. The acceleration of Fe 3+ /Fe 2+ cycles in the Cu-Fe LDHs/Bi 2 WO 6 /H 2 O 2 /Vis system was mainly ascribable to the combination of efficient transfer of photogenerated electrons and self-circle redox of Fe 3+ /Cu + . It is expected for the promising application of multivalent bimetallic photo-Fenton catalysts and rendering enlightenments for photo-Fenton catalytic oxidation reaction.
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
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
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Li Liu,Jing Mo,Jie Xu,Yangxi Liu,Ruoxi Yang,Xiaohui Yang,Xinguo Ma,Wensheng Fu
Heterojunction has the characteristics of adjusting catalyst structure, improving oxygen evolution kinetics and breaking the elevated reaction barrier of oxygen evolution process. In this paper, a heterostructure catalyst of NiCo-LDHs nanosheets encapsulated CuS hollow nano-octahedrals has been reported, which has better stability and higher mass transfer efficiency compared with two-dimensional nanosheets. Density functional theory (DFT) calculations indicate that the heterostructure strengthens the orbital hybridization of metal 3 d and O 2 p , at the same time, the heterointerface coupling induces the directional movement of electrons from NiCo-LDHs to CuS, which together provide abundant high-valence Ni and Co active sites, promote the conversion of *OH to *O species, thus reducing the energy required for the reaction. Hence, CuS@NiCo-LDHs exhibits excellent OER performance and good stability in 1 M KOH. When the current density is 10 mA/cm 2 , the overpotential and Tafel slope of this catalyst is only 253 mV and 56 mV/dec, respectively. This study furnishes the construction of heterogeneous structures and the catalyst exploitation with serviceable insights.
研究领域:
催化
·
材料科学
·
电化学
·
纳米技术
✓ 已验证
产品关联
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
·
腐蚀科学
·
纳米技术
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Yuan Deng,Qingqing Guan,Liang He,Jing Li,Lincai Peng,Junhua Zhang
The existence of hydroxyl and carboxyl groups makes the photothermal stability of cellulose nanofibers (CNFs) poor and thus limits its scale application. This problem could be solved by doping layered double hydroxides (LDHs) nanopowders with opposite charge on the surface of CNFs . This work mainly focused on investigation of the influence of the crystal morphology of the inorganic ultraviolet shielding agent (i.e. ZnAl-LDHs) on the thermal stability of CNFs/ZnAl-LDHs composited films. The results showed that the morphology of LDHs was positively correlated with the photothermal stability of CNFs-based films. Specially, the ZnAl-LDHs with uniform crystal morphology could be prepared by controlling the molar ratio of Zn/Al at 3:1 and thus enhance the photothermal stability of CNFs-based films without any serious light transmittance deteriorating after doping. This work provided a practical and effective way for preparation of photothermal-stable CNFs-based transparent films for industrial application in the fields of photonics and electronics.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Chengzhi Wei,Wenrui Wu,Yang Yang,Yue Yan,Hao Zhang,Xianfu Li
In this study, MoSe2 and NiFe-LDHs were synthesized on a self-supported conductive nickel foam (NF) substrate via a one-step method. Specifically, MoSe2 was grown on the nickel foam via a one-step solvothermal method to form the MoSe2/NF precursor material. Subsequently, NiFe-LDHs were deposited on the MoSe2/NF substrate through a one-step hydrothermal method, resulting in the formation of the NiFe-LDHs/MoSe2/NF composite material. We found that although both NiFe-LDHs and MoSe2 monomers have certain disadvantages, such as a tendency to agglomerate and relatively poor electrical conductivity, their combination yields an interesting “two negatives make a positive” effect. The NiFe-LDHs/MoSe2/NF composite exhibits a high specific capacitance of 6790 mF cm–2 at a current density of 2 mA cm–2, which is significantly higher than that of NiFe-LDHs (1317.6 mF cm–2) and MoSe2 (1475.2 mF cm–2). Additionally, the composite demonstrates excellent cycling stability, with a capacitance retention of 99.87% after 4000 cycles. In contrast, NiFe-LDHs/NF retains only 54.01% of its capacitance after 2000 cycles, and MoSe2/NF retains only 48.15% after the same number of cycles. The asymmetric supercapacitors (ASCs) assembled from the NiFe-LDHs/MoSe2/NF composite and activated carbon (AC) show remarkable performance. These devices have a high potential window of 0–1.55 V and achieve an extremely high energy density of 0.5558 mWh cm–2 at a power density of 1.55 mW cm–2. Moreover, they exhibit an ultrahigh capacitance retention of 99.1% after 10,000 cycles, indicating excellent cycling stability. The Coulombic efficiency of the capacitor remains at a high value of approximately 99.8% throughout the cycling process. NiFe-LDHs/MoSe2/NF and similar materials can be designed for flexible supercapacitors integrated into clothing or skin patches to power sensors. In the context of medical device designs requiring energy storage components to rapidly release substantial energy, they may also play a critical role.
研究领域:
材料科学
·
能源存储
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）