APPLIED SURFACE SCIENCE
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2020
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IF 6.182
Huizhen Deng,Juanjuan Yin,Jinming Ma,Jingxin Zhou,Lexin Zhang,Lili Gao,Tifeng Jiao
A novel catalyst composed of Ag 3 PO 4 bridged by Ni/Ti LDH-graphene heterojunction structure was successfully prepared by a simple in-situ deposition method, which has excellent catalytic performance for 4-NP and 2-NA. Various characterizations to the samples such as XRD, SEM, TEM, STEM-EDS, XPS, TG–DSC, and UV–vis DRS were adopted. Because the ternary structure is mixed with each other to form more heterojunctions and higher specific surface area, the ternary composite Ag 3 PO 4 /Ni-Ti LDH/GO has excellent catalytic and cycle performance. Compared to the precursors Ag 3 PO 4 /GO and Ni-Ti LDH/GO, the finally as-obtained nanocomposite Ag 3 PO 4 /Ni-Ti LDH/GO degraded 4-NP and 2-NA solutions represented more dominant degradation efficiency. In addition, the pseudo-first-order rate constants of the composite catalyst for 4-NP and 2-NA are 0.178 min −1 and 0.089 min −1 , respectively. The complex and irregular surfaces of Ni-Ti LDH/GO provided an ideal carrier with abundant active sites for in-situ depositing and stabilizing of Ag 3 PO 4 NPs, formed the Ag 3 PO 4 /Ni-Ti LDH/GO hybrid possessed an acceptable catalytic performance on the degradation of azo dyes, which could be applied in the efficient treatment of wastewater from industries.
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RSC Advances
·
2018
·Vol. 8
·期 63
·36114-36122
·
IF 2.936
Hailin Guo,Yifan Wang,Chaofeng Li,Keqing Zhou
In this work, sandwich-like structured CoAl-LDH@ZIF-67 hybrids were constructed by in situ growth of nanosized ZIF-67 crystallites on CoAl-LDH nanoplates. The structure and morphology of CoAl-LDH@ZIF-67 hybrids were represented by X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR) and Transmission Electron Microscopy (TEM). Accordingly, the hybrids were introduced into epoxy resins to explore their effect on the thermal and fire safety properties of epoxy composites. With the introduction of 2% CoAl-LDH@ZIF-67 hybrids, the T10%, T50% and Tmax values were decreased to some extent and the char residue yield was higher than that of pristine epoxy. The peak heat release rate (PHRR) of epoxy composites declined by 26.4%, in comparison with those of pure epoxy. Moreover, the quantity of smoke produced, toxic CO released and CO2 produced were suppressed markedly and decreased by 16.7%, 59.8% and 32.2%, respectively. A possible mechanism for improving fire safety was put forward based on the analysis of the carbon residues.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2017
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IF 3.359
Qingxiang Zhou,Man Lei,Jing Li,Kuifu Zhao,Yongli Liu
Mg-Al-layered double hydroxide (Mg-Al-LDH) modified nanoscale zero-valent iron (NZVI) (Fe@MgAl-LDH) was firstly synthesized and characterized by several techniques. The results showed that the layered double hydroxides were coated on the surface of nanoscale zero-valent iron particles. This new material exhibited good adsorption for bisphenol A, 4-octylphenol and 4-nonylphenol from water samples. Based on these, a sensitive method was developed for the extraction and preconcentration of bisphenol A, 4-octylphenol and 4-nonylphenol using magnetic Fe@MgAl-LDH nanoparticles as the solid phase extraction adsorbents prior to high performance liquid chromatography coupled with variable wavelength detection. Under the optimal conditions, linear responses were achieved in the range of 0.5–200 μg L −1 with the correlation coefficients (r) above 0.999. The detection limits of three analytes were in the range of 0.24–0.34 μg L −1 , and precisions were all below 2.5% (n = 6). The proposed method was evaluated with real water samples and the excellent spiked recoveries in the range of 96.0–99.3% were achieved.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Mengqing Hu,Di Zhao,Xinlong Yan,Yun Wang,Jin Zhang,Xiaoyan Hu,Ming Zhou,Porun Liu
Designing advanced bimetallic catalysts is essential to improving peroxymonosulfate (PMS) activation. Herein, a novel magnetic nickel/cobalt-layered double hydroxide decorated nitrogen-doped carbon (Ni/Co LDH@NC) catalyst we synthesized using carbonized ZIF-67 as a template for simultaneous removal of sulfamethoxazole (SMX) and Pb(Ⅱ) by PMS activation. The synthesized Ni/Co LDH@NC achieved complete degradation of SMX within 20 min and adsorbed Pb(Ⅱ) at 90.3 mg g −1 in 2 h. Notably, in simulated mixed wastewater, Ni/Co LDH@NC removed 100 % of SMX and simultaneously absorbed 84 % of Pb(Ⅱ) within 60 min. Density functional theory (DFT) studies revealed that synergistic Ni-Co sites and “bridging oxygen” vacancies enhanced electron transfer to PMS, facilitating O-O bond cleavage. The catalyst maintained high performance after four cycles, with over 85 % SMX degradation and 80 % Pb(Ⅱ) removal. This study highlights the potential of MOF-derived catalysts for efficient, simultaneous remediation of antibiotic and heavy metal pollutants, contributing to advanced wastewater treatment.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Aijia Zhang,Haijiao Lin,Tian Yuan,Qiancheng Zhu,Ling Li,Youwei Zhao,Wenming Zhang
Multifunctional interfacing is a key aspect of flexible sensor development that facilitates enhanced interaction with the natural environment. However, challenges faced by contemporary multifunctional flexible sensors are structural complexity and high cost. Herein, inspired by the specific structure of pinecone in nature and the microstructured neural networks randomly distributed within human skin, we fabricated Co-cMOFs/CoZnAl-LDH composite nanomaterials with pinecone-like microstructure. Through the mutual verification of finite element simulation and experimental data, the mechanism of high sensitivity of the sensor is dynamically revealed from the structural point of view. The prepared pressure sensors exhibit a detection range (0–120 kPa), high sensitivity (2.35 × 10 9 kPa −1 ) and fast response. The photoelectric sensor shows enhanced photoelectric energy conversion, which shows great potential in the detection of sunlight intensity (20–100 mW cm −2 ). Simultaneously, building a hybrid pressure, acoustic and optical sensing platform and validating its superior performance in human movement and health monitoring applications. Furthermore, a strategy of light intensity feedback system to guide personalized health activities is put forward, so that doctors can guide patients/elderly health activities remotely.
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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Jiachen Zhu,Shengjie Lan,Donghai Zhu
To impart epoxy resin (EP) with outstanding mechanical properties and fire safety, LDH was systematically functionalized through gluconate anion (GA) intercalation followed by surface assembly of ultrafine Cu(OH) 2 , resulting in the LDH-GA@Cu(OH) 2 hybrid. Comprehensive characterizations confirmed the successful synthesis of the desired product, with a uniform distribution of ultrafine Cu(OH) 2 nanoparticles on the GA-intercalated LDH surface. The findings revealed that LDH-GA@Cu(OH) 2 improved the mechanical properties of EP due to the increased LDH layer spacing, facilitating EP chain insertion, and the hydrogen bonding between the –OH of GA and the EP matrix. Fire retardancy tests indicated that the EP composite containing 7.5 wt% LDH-GA@Cu(OH) 2 achieved a limiting oxygen index (LOI) of 30.1%. Furthermore, compared to pure EP, the composite demonstrated significant reductions in the peak heat release rate (PHRR) and peak CO production rate (PCOP) by 47.4% and 60.5%, respectively, underscoring its superior flame-retardant and toxic smoke suppression capabilities. Mechanistic studies further indicated that ultrafine Cu(OH) 2 enhanced char formation through catalytic charring at the interface, which promoted compact and cohesive char layers. Overall, this work proposes a promising functionalization strategy for LDH to endow EP with excellent comprehensive performance.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Hongyu Zhang,Fengying Zhang,Antong Shi,Jiahan Yang,Zhehan Tu,Weixin Lin,Xue Bai,Gongduan Fan,Zhuwu Jiang
The design and catalytic potential of materials with simultaneously oxidation and reduction performance remains underexplored, particularly in three-dimensional electrochemical systems. This study developed a carbon nanosheet framework with iron insertion and nitrogen doping, as the skeleton for the deposition of. nickel‑manganese metal mixture. Advanced characterization confirmed that the addition of Fe/C-N skeleton can improve morphology and specific surface, which in turn enhances electronic conductivity and degradation efficiency. Electron paramagnetic resonance (EPR) and density functional theory (DFT) calculations certify that the Fe/C-N skeleton can enhance the electron supply capacity and thereby accelerate the generation and stabilization of •H and •OH species during the reaction. Under optimal conditions, the system achieved a maximum Chloracetamide (MCAcAm) degradation rate of 68.86 % and good stability. Moreover, in practical tests using industrial wastewater pre-treated with chlorination, the composite showed exceptional efficiency, achieving 86.14 % chemical oxygen demand (COD) and 74.01 % total organic carbon (TOC) removal within 1 h. These results highlight the potential of NiMn-LDH/MnO 2 -Fe/C-N (Name it NML-Fe/C-N) for practical wastewater treatment and provide valuable insights into the design of advanced electrode materials and the mechanisms of electrocatalytic degradation.
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DYES AND PIGMENTS
·
2019
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IF 4.018
Muhammad Sohail Haroone,Yuehua Hu,Ping Zhang,Ruili Ma,Xiaorang Zhang,Qari Muhammad Kaleem,Muhammad Bashir Khan,Jun Lu
Nucleic acids , the hereditary material of living beings, perform a vital role in major life activities including growth, heredity, and variation. The genetic information is coded in specific nitrogenous bases , which are the key players in genetic transformation and identification of hereditary diseases. Telomeres are specialized DNA structures present at the end of eukaryotic chromosomes, consisting of repetitive non-transcribed sequences (TTAGGG) and some binding proteins . They protect the chromosomal ends from sticking to each other, and play a key role in the maintenance of genomic integrity. Currently, a number of methods are reported for nucleic acids and telomeres detection but they are not easy going. Therefore, development of sensitive and fast DNA-biosensors to measure the nucleic acids and telomeres sequences is of great importance. This paper describes a systematic study on the preparation of simple ultrathin films (UTFs) composite of fluorescent dye 4′,6-diamidino-2-phenylindole (DAPI), having binding properties in the minor groove of AT-rich DNA segments, blending with single-stranded DNA (ssDNA) and incorporation into layered double hydroxides (LDH) nanosheets using layer-by-layer self-assembly method. The resulting UTFs exhibits excellent sensitivity, selectivity and reversibility for long complementary ssDNA sequence on the basis of DNA hybridization and fluorescence enhancement strategy. The dynamic range was 3–20 μg/mL with a detection limit of 20 μg/mL. This new (ssDNA @DAPI/LDHs) n UTFs, could be an efficient hybrid composite with potential applications in the field of bioluminescent sensoring materials.
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CHEMOSPHERE
·
2022
·
IF 8.943
Xiao Tan,Yinjie Zhang,Meng Liu,Jinman Cao,Guilan Duan,Jun Cui,Aijun Lin
Cr(VI) contamination in aquatic systems has been a challenge for environmental science researchers. To environmental-friendly, stable, and efficiently remove Cr (VI), a novel layered double hydroxide was prepared through the ultrasonic-assisted co-precipitation method. The ultrasonic-assisted step prevented the Fe 2+ oxidation, improved the morphology and performance, and finally, the adsorption-coupled reduction capacity and stability were enhanced. By adding U–Fe/Al-LDH (1.0 g/L) for Cr(VI) (100 mg/L), the removal rate reached 82.24%. The removal data were well fitted by the pseudo-second-order kinetic and Langmuir isotherm model. Using U–Fe/Al-LDH can be performed over a wide pH range (2–10), with a theoretical maximum removal capacity of 118.65 mg/g. The Cr(VI) with high toxicity was adsorbed and reduced to low-toxicity Cr(III). In the final phase, stable Cr(III) complex precipitates were generated. After 30 days, the dynamic leaching amounts of total Cr in used U–Fe/Al-LDH-2 were 0.1052 mg/L. Combined with the results of the influence experiment of coexisting anions and oxidants and the SO 4 2− release experiment, the stability of the removal effect and the safety of U–Fe/Al-LDH were proved. In conclusion, U–Fe/Al-LDH-2 is a promising remediation agent and a feasible Cr(VI) removal method for the practical remediation.
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FUEL
·
2023
·
IF 7.4
Junnan Tao,Mingyuan Wang,Xiangzhao Zhang,Lei Lu,Hua Tang,Qinqin Liu,Shuangying Lei,Guanjun Qiao,Guiwu Liu
Energy band matching coupled with intimate interface in a heterojunction is the prerequisite for achieving the separation of photogenerated carriers. Herein, 0D CdS nanospheres were uniformly anchored in 3D flower-like CoAl layered double hydroxide (CoAl-LDH) spheres via a hydrothermal process. The unique porous structure and abundant hydrophilic groups can significantly promote the interactions between catalyst and solutions and thus facilitate the photocatalytic reaction. The appropriately staggered band structures can trigger the formation of S-scheme heterojunction, and the tight connection between the CdS and CoAl-LDH offers more charge transport channels, thereby accelerating the charge transfer. The optimized CdS/CoAl-LDH nanohybrid presents a photocatalytic hydrogen evolution of 6.19 mmol/g/h and tetracycline hydrochloride (TC) degradation efficiency of 92.2 % in 50 min. Moreover, the Cd 2+ ion concentration measured by ICP-OES verifies the alleviation of photocorrosion, and the DFT calculations further demonstrate the higher hydrophilia, lower H 2 absorption energy and stronger charge interactions of CdS/LDH hybrid. This work provides a feasible strategy to efficiently utilize the photoinduced carries by constructing a highly hydrophilic S-scheme heterojunction.
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Small Structures
·
2023
·Vol. 4
·期 11
·2300177
·
IF 15.9
Yi-lei Li,Qing Zhao,Xu-jia Liu,Ying Liu,Ying-juan Hao,Xiao-jing Wang,Xin-ying Liu,Diane Hildebrandt,Feng-yu Li,Fa-tang Li
Precise regulation of photogenic electron transfer path plays an important role in improving photocatalytic carbon dioxide reduction efficiency and product selectivity. Herein, under the guidance of density functional theory calculation, the interface chemical bond (Co N 2 bond) at the atomic level is designed, and g-C 3 N 4 /CoCo-layered double hydroxide (LDH) heterostructure is manufactured. CoCo-LDH with water oxidation ability and g-C 3 N 4 were combined to construct S-scheme heterojunction with redox ability. The valence band and conduction band of g-C 3 N 4 and CoCo-LDH are precisely connected by the interfacial Co N 2 bond, which realizes the high-speed transfer of electron transport. Despite the absence of cocatalyst, the heterojunction exhibits high water oxidation and carbon reduction capacity due to the precise regulation of Co N 2 bonds. Theoretical calculations and experimental results show that the addition of CoCo-LDH: reduces the oxidation overpotential of water to provide more H protons; regulates the delocalization charge of g-C 3 N 4 ; and reduces the energy barrier of the CO 2 intermediate (*COOH) in the reduction half-reaction. The results show that the selectivity of carbon-based substances in the products was 100%, and the optimal CO yield was 71.39 μmol g −1 h −1 , which is among the highest values of g-C 3 N 4 -based photocatalysts.
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CHEMOSPHERE
·
2020
·
IF 5.778
Zhiguo Lin,Jing Chen
In order to facilitate recovery and enhance phosphate adsorption capacity of lanthanum (La)-based materials, magnetic Fe 3 O 4 @MgAl-LDH@La(OH) 3 (MMAL) composites with a hierarchical core-shell structure were synthesized. In the preparation process, citric acid played a vital role in the morphology control of La(OH) 3 , deciding the La content and phosphate adsorption capacity of materials. MMAL composites with a citric acid-to-La molar ratio of 0.375 (MMAL-0.375) exhibited a high adsorption capacity of 66.5 mg P/g, fast adsorption kinetics of 30 min, widely applicable pH range of 4.0–10.0, outstanding selective adsorption performance, and superior reusability in batch adsorption experiments. Moreover, the phosphate in the desorption solution could be concentrated by repeated use of desorption solution and recovered by using CaCl 2 . When the obtained composites were used for the sedimentary phosphorus sequestration and recovery, the results showed that the addition of MMAL-0.375 effectively reduced the concentration of soluble reactive phosphorus (SRP) in the overlying water. Accompanied by an evident increase in HCl-extractable phosphorus (HCl–P), mobile phosphorus (P mob ) in sediments was effectively reduced. This work indicates that the MMAL-0.375 composites can serve as an effective tool for the removal of phosphate from wastewater and the control of sedimentary phosphorus.
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