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layered double hydroxide

Junya Wang, Ying Yang, Lijuan Jia, Na Yang, Qingqing Guan, Liang Huang, Ahmad Umar, Qiang Wang, Ping Ning
In this paper, the influence of charge compensating anions of Layered double hydroxides (LDHs) in the LDH-NS/GO nanohybrid for carbon dioxide capture was systematically investigated. The four kinds of different charge compensating anion intercalated LDH were exfoliated and the LDH and Graphene oxide (GO) nanohybrids were synthesized by "exfoliation-self-assembly" method. In this contribution, the CO2 capture capacity of LDH was improved by introducing of GO. And the calcination and adsorption conditions were tested, which proved that the LDH-NS/GO nanohybrids can be used in a wide temperature range for carbon dioxide capture, and the appropriate calcination temperature is 400 °C...
April 1, 2018: Journal of Nanoscience and Nanotechnology
Xinrui Zhong, Zhang Zhang, Tuantuan Zhou, Peng Lu, Jin Cheng, Sining Chen, Zhifei Shu, Yichen Hong, Qiang Wang, Ahmad Umar
Herein, flower-shaped ternary layered double hydroxides (LDHs) Mg3Al1-xFex-CO3 with tunable memory effect as promising adsorbents was developed for the removal of acid red 88 anionic dye. All the samples were prepared using a co-precipitation method and were thoroughly characterized using several analytical techniques. The influence of Fe/(Al + Fe) ratio on the memory effect and dye adsorption capacity of Mg3Al1-xFex-CO3 LDHs was evaluated. Among all samples, Mg3Fe0.1Al0.9CO3 LDH resulted in the best adsorption capacity of 2709 mg/g in the first cycle...
April 1, 2018: Journal of Nanoscience and Nanotechnology
Qinghong Kong, Ting Wu, Jiaqi Wang, Hong Liu, Junhao Zhang
Nickel and aluminum layered double hydroxide (NiAl-LDH) was synthesized via co-precipitation and modified by sodium dodecyl sulfate (SDS), which was marked as NiAl-OLDH. The structure of NiAl-LDH was characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). In order to investigate the role of LDH on polymer/intumescent flame retardant (IFR) systems, polypropylene (PP)/IFR/NiAl-OLDH nanocomposites were prepared by melt intercalation. Thermal and flame retardant properties of PP/IFR/NiAl-OLDH nanocomposites were studied...
May 1, 2018: Journal of Nanoscience and Nanotechnology
Yaping Zhang, Jingwen Ji, Haiping Li, Na Du, Shue Song, Wanguo Hou
Nanocomposite (NC) hydrogels of positively charged layered double hydroxide (LDH) single-layer nanosheet (SLNS) cross-linked poly(N-isopropylacrylamide) (PNIPAM) were synthesized. Especially, the LDH SLNSs used here were pre-synthesized via an aqueous synthetic route without using organic solvents and modifiers. The obtained LDH/PNIPAM NC hydrogels were characterized using XRD, SEM, TEM, and DSC. The mechanical and thermoresponsive properties were determined using tensile, compression, and swelling/deswelling tests...
February 14, 2018: Soft Matter
Dongpeng Yan, Muhammad Arif, Ghulam Yasin, Muhammad Shakeel, Xiaoyu Fang, Rui Gao, Shengfu Ji
The development of durable, low cost and efficient photo/electrolysis for oxygen/hydrogen evolution reactions (OER and HER) is important to fulfill the increasing energy requirement. In this work, high-efficiency and active photo/electrochemical catalysts, CoMn-LDH@g-C3N4 hybrids, have been synthesized successfully through a facile in situ co-precipitation method at room temperature. The CoMn-LDH@g-C3N4 composite exhibits an obvious OER electrocatalytic performance with current density of 40 mA·cm-2 at overpotential of 350 mV for water oxidation, which is 2...
February 12, 2018: Chemistry, An Asian Journal
Shanyue Guan, Di Yang, Yangziwan Weng, Heng Lu, Xiangmin Meng, Xiaozhong Qu, Shuyun Zhou
In this work, a novel ruthenium complex loaded monolayer layered double hydroxide (LDH) (denoted as Ru(C-bpy)2 /mLDH) as supramolecular nanosensor is synthesized, which is greatly exclusive to the hypoxic tumor microenvironment. The Ru(C-bpy)2 /mLDH ultrathin sheet displays not only enhanced luminescence lifetime compared to the parent Ru(C-bpy)2 alone, but also improved oxygen responsibility under an excitation of 488 or 800 nm. Moreover, the Ru(C-bpy)2 /mLDH is possessed of two-photon fluorescence imaging ability under the 800 nm irradiation...
February 12, 2018: Advanced Healthcare Materials
Jose A Carrasco, Salvador Cardona-Serra, Juan Modesto Clemente-Juan, Alejandro Gaita-Ariño, Gonzalo Abellán, Eugenio Coronado
Layered double hydroxides (LDHs) exhibit unparalleled anion exchange properties and the ability to be exfoliated into 2D nanosheets, which can be used as a building block to fabricate a wide variety of hybrid functional nanostructured materials. Still, if one wants to use LDHs as a magnetic building blocks in the design of complex architectures, the role played by the dipolar magnetic interactions in these layered materials needs to be understood. In this work, we synthesized and characterized a five-membered CoAl-LDH series with basal spacing ranging from 7...
February 8, 2018: Inorganic Chemistry
Goeun Choi, Sairan Eom, Ajayan Vinu, Jin-Ho Choy
Layered double hydroxides (LDHs) with two dimensional structure have been attracted considerable interest in exploring new intercalative nanohybrids, such as inorganic-LDHs, organic-LDHs and bio-LDHs ones, which often exhibit extraordinarily synergetic effects and complementary performances. More recently, bio-related nanotechnology becomes one of the most essential research field in the viewpoint of the health and safety of human being. In this regard, LDHs have been focused as an important inorganic material for gene and drug delivery carriers with imaging and targeting functions...
February 8, 2018: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
Yilei Zheng, Yinghong Chen
Differential scanning calorimeter was used to extensively investigate the non-isothermal crystallization of polypropylene (PP)/layered double hydroxides (LDHs) nanocomposites prepared through wet solid-state shear milling. The corresponding crystallization kinetics was further investigated by using Ozawa, modified Avrami and combined Avrami-Ozawa method, respectively. The results showed that the Ozawa method could not well describe the crystallization kinetics of pure PP and its nanocomposites. Comparatively, the modified Avrami method as well as the combined Avrami-Ozawa method gives the satisfactory results...
January 2018: Royal Society Open Science
Panpan Li, Feng Yu, Naveed Altaf, Mingyuan Zhu, Jiangbing Li, Bin Dai, Qiang Wang
CH₄ as the paramount ingredient of natural gas plays an eminent role in C1 chemistry. CH₄ catalytically converted to syngas is a significant route to transmute methane into high value-added chemicals. Moreover, the CO/CO₂ methanation reaction is one of the potent technologies for CO₂ valorization and the coal-derived natural gas production process. Due to the high thermal stability and high extent of dispersion of metallic particles, two-dimensional mixed metal oxides through calcined layered double hydroxides (LDHs) precursors are considered as the suitable supports or catalysts for both the reaction of methanation and methane reforming...
January 31, 2018: Materials
Hua-Jie Xu, Bingkai Wang, Changfu Shan, Pinxian Xi, Wei-Sheng Liu, Yu Tang
Developing convenient doping to build highly active oxygen evolution reaction (OER) electrocatalysts are practical processes for solving the energy crisis.. Herein, a facile and low cost in-situ self-assembly strategy for preparing Ce-doped NiFe-LDH Nanosheets/Nanocarbon (denoted as NiFeCe-LDH/CNT, LDH = layered double hydroxide, CNT = carbon nanocube) hierarchical nanocomposite is established for enhanced OER, in which the novel material provides its overall advantageous structural features, including the high intrinsic catalytic activity,the rich redox properties and high, flexible coordination number of Ce3+ and the strongly coupled interface...
January 31, 2018: ACS Applied Materials & Interfaces
Yue Ma, Yongchuang Wang, Donghua Xie, Yue Gu, Haimin Zhang, Guozhong Wang, Yunxia Zhang, Huijun Zhao, Po Keung Wong
Excessive uptake of nitrite has been proven to be detrimental to ecological system and human health. Hence, there is a rising requirement for constructing effective electrochemical sensors to precisely monitor the level of nitrite. In this work, NiFe-layered double hydroxide nanosheet arrays (NiFe-LDH NSAs) have been successfully fabricated on a carbon cloth (CC) substrate via a facile one-pot hydrothermal route. By integrating the collective merits of macroporous CC and NiFe-LDH NSAs such as superior electrical conductivity, striking synergistic effect between dual active components, enlarged electrochemically active surface area, unique threedimensional (3D) hierarchical porous network characteristics, and fast charge transport and ion diffusion, the proposed NiFe-LDH NSAs/CC architectures can be served as the self-supporting sensor toward nitrite detection...
January 30, 2018: ACS Applied Materials & Interfaces
Milad Ghani, Carlos Palomino Cabello, Mohammad Saraji, Jose Manuel Estela, Víctor Cerdà, Gemma Turnes Palomino, Fernando Maya
The application of layered double hydroxide-Al2 O3 -polymer mixed-matrix disks for solid-phase extraction is reported for the first time. Al2 O3 is embedded in a polymer matrix followed by an in situ metal-exchange process to obtain a layered double hydroxide-Al2 O3 -mixed-matrix disk with excellent flow-through properties. The extraction performance of the prepared disks is evaluated as proof of concept for the automated extraction using sequential injection analysis of organic acids (p-hydroxybenzoic acid, 3,4-dihydroxybenzoic acid, gallic acid) following an anion-exchange mechanism...
January 26, 2018: Journal of Separation Science
Ying Zhu, Jingjing Liu, Omanjana Goswami, Ashaki A Rouff, Evert J Elzinga
We studied the effects of humic substances (HS) on the sorption of Fe(II) onto Al-oxide and clay sorbents at pH 7.5 with a combination of batch kinetic experiments and synchrotron Fe K-edge EXAFS analyses. Fe(II) sorption was monitored over the course of 4 months in anoxic clay and Al-oxide suspensions amended with variable HS types (humic acid, HA; or fulvic acid, FA) and levels (0, 1, and 4 wt%), and with differing Fe(II) and HS addition sequences (co-sorption and pre-coated experiments, where Fe(II) sorbate was added alongside and after HS addition, respectively)...
January 25, 2018: Geochemical Transactions
Xiangling Zhang, Yu Lei, Ye Yuan, Jingtian Gao, Yinghe Jiang, Zhouying Xu, Shuangjie Zhao
Nine kinds of LDHs were synthesized by the co-precipitation method under alkaline conditions with different combinations of trivalent metal compounds (FeCl3, AlCl3, CoCl3) and divalent metal compounds (CaCl2, MgCl2, ZnCl2), which were then coated in situ on the surface of zeolites to synthesize core-shell zeolites/LDHs composites. The zeolites before and after modification were characterized by SEM and X-ray fluorescence spectrometry. Using the different core-shell zeolites/LDHs and original zeolite substrates, the constructed rapid infiltration systems (CRIS) simulated test columns were set to treat the municipal sewage containing hexavalent chromium, Cr(VI)...
January 24, 2018: Environmental Science and Pollution Research International
Beidou Guo, Aisha Batool, Guancai Xie, Rajender Boddula, Liangqiu Tian, Saad Ullah Jan, Jian Ru Gong
Designing high-quality interfaces is crucial for high-performance photoelectrochemical (PEC) water-splitting devices. Here, we demonstrate a facile integration between polycrystalline n+p-Si and NiFe-layered double hydroxide (LDH) nanosheet array by a partially activated Ni (Ni/NiOx) bridging layer for the excellent PEC water oxidation. In this model system, the thermally deposited Ni interlayer protects Si against corrosion and makes good contact with Si, and NiOx has a high capacity of hole accumulation and strong bonding with the electrodeposited NiFe-LDH due to the similarity in material composition and structure, facilitating transfer of accumulated holes to the catalyst...
January 23, 2018: Nano Letters
Yechuang Han, Pengfei Li, Jun Liu, Shouliang Wu, Yixing Ye, Zhenfei Tian, Changhao Liang
Agglomeration-triggered deactivation of supported platinum electrocatalysts markedly hinders their application in methanol oxidation reaction (MOR). In this study, graphene-supported nickel-iron layered double hydroxide (NiFe-LDH/rGO), in which Fe3+ was introduced to replace Ni2+ partially in the Ni(OH)2 lattice to provide stronger metal-support bonding sites, was utilized to immobilize Pt nanoparticles (NPs). Given the optimized metal-support interfacial contact (Fe3+-O(H)-Pt) between Pt NPs and NiFe-LDH/rGO nanosheets for Pt/NiFe-LDH/rGO electrocatalysts, the Pt/NiFe-LDH/rGO electrocatalysts displayed dramatically enhanced durability than that of Pt/Ni(OH)2/rGO counterpart as well as commercial Pt/C, and 86...
January 22, 2018: Scientific Reports
Yifan Zeng, Yanyong Wang, Gen Huang, Chen Chen, Liangliang Huang, Ru Chen, Shuangyin Wang
Porous materials are widely studied in many applications due to their high surface area and rich edge sites. Here, for the first time, we reported a simple and convenient method to synthesize porous nanosheets of metal hydroxides by selectively etching amphoteric Al in CoAl layered double hydroxides on carbon paper (CoAl-LDH/CP), and then convert them into porous cobalt phosphide nanosheets on carbon paper (p-CoP/CP) via low temperature phosphidation. In contrast to pristine cobalt phosphide nanosheets on carbon paper (CoP/CP), p-CoP/CP has lower overpotential, Tafel slope and charge transfer resistance as well as higher electrochemically active surface area...
January 22, 2018: Chemical Communications: Chem Comm
Libo Gao, Hongti Zhang, James Utama Surjadi, Peifeng Li, Ying Han, Dong Sun, Yang Lu
Recently, solid asymmetric supercapacitor (ASC) has been deemed as an emerging portable power storage or backup device for harvesting natural resources. Here we rationally engineered a hierarchical, mechanically stable heterostructured FeCo@NiCo layered double hydroxide (LDH) with superior capacitive performance by a simple two-step electrodeposition route for energy storage and conversion. In situ scanning electron microscope (SEM) nanoindentation and electrochemical tests demonstrated the mechanical robustness and good conductivity of FeCo-LDH...
January 22, 2018: Nanoscale
Guangbo Chen, Tao Wang, Jian Zhang, Pan Liu, Hanjun Sun, Xiaodong Zhuang, Mingwei Chen, Xinliang Feng
Owing to its earth abundance, low kinetic overpotential, and superior stability, NiFe-layered double hydroxide (NiFe-LDH) has emerged as a promising electrocatalyst for catalyzing water splitting, especially oxygen evolution reaction (OER), in alkaline solutions. Unfortunately, as a result of extremely sluggish water dissociation kinetics (Volmer step), hydrogen evolution reaction (HER) activity of the NiFe-LDH is rather poor in alkaline environment. Here a novel strategy is demonstrated for substantially accelerating the hydrogen evolution kinetics of the NiFe-LDH by partially substituting Fe atoms with Ru...
January 19, 2018: Advanced Materials
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