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layered double hydroxide

Chi Ma, Fenghua Wang, Chang Zhang, Zhigang Yu, Jingjing Wei, Zhongzhu Yang, Yongqiu Li, Zihao Li, Mengying Zhu, Liuqing Shen, Guangming Zeng
The new nanophotocatalyst MgZnCr-TiO2 was prepared by co-precipitation under different molar ratio of metals (Zn:Cr) and the loaded amount of TiO2. And it was characterized by X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy et al. Langmuir model fitted well the adsorption isotherm with the value of R(2) 0.9765, the maximum adsorption capacity was 526.32 mg g(-1), the adsorption followed pseudo second order kinetic by MgZnCr-TiO2 (1:1:2-0.05). The photocatalytic oxidation of Congo red was used to determine the photocatalytic performance of MgZnCr-TiO2 (1:1:2-0...
October 21, 2016: Chemosphere
M Li, F Liu, X B Zhang, J P Cheng
A variety of carbon materials varying from 0D to 2D, i.e. 0D nanoparticles, 1D carbon nanotubes (CNTs) and 2D reduced graphene oxide (rGO) are selected to in situ combine with Ni-Mn layered double hydroxide (LDH) to prepare electrode materials for supercapacitors. Through a simple solution method, hierarchical Ni-Mn LDH/carbon composites can be easily fabricated. A comparative study is carried out on the sandwich-like LDH/rGO, flower-like LDH/carbon black, turbostratic-structured LDH/CNTs and ternary LDH/CNTs/rGO for their structure, morphology, porous properties and electrochemical performances...
October 24, 2016: Physical Chemistry Chemical Physics: PCCP
Shirin Babaee, Ali Daneshfar, Tahere Khezeli
Magnetically separable layered double hydroxide Ni/CuAl-LDH nanocomposites were synthesized and employed as ultrasonic-assisted dispersive micro-solid phase extraction (UA-D-μSPE) sorbent to extract several carboxylic acids (namely propionic, butyric, pentanoic, hexanoic, heptanoic, octanoic, and decanoic) from non-alcoholic beer samples. Ni/CuAl-LDH sorbent was characterized by Fourier transform-infrared (FTIR) spectroscopy, transmission electron microscopy (TEM), and vibrating sample magnetometry (VSM). Effective variables such as amount of sorbent (mg), pH and ionic strength of sample solution, volume of eluent solvent (μL), vortex, and ultrasonic times (min) were investigated via fractional factorial design (FFD)...
January 2017: Ultrasonics Sonochemistry
Mohamed Amine Djebbi, Alae Elabed, Zaineb Bouaziz, Moulay Sadiki, Soumya Elabed, Philippe Namour, Nicole Jaffrezic-Renault, Abdesslem Ben Haj Amara
Layered double hydroxide (LDH) has attracted major interest as one of the most versatile drug delivery systems especially for adsorption capacity and/or controlled delivery property of bioactive agents owing to their combining features of biohybrid. ZnAl synthesized layered double hydroxide can offer a platform to immobilize various types of bioactive compounds, particularly berberine chloride (BBC). However, the immobilization reaction of berberine chloride into ZnAl-LDH was performed by direct co-precipitation method at different ratios of BBC/LDH...
October 19, 2016: International Journal of Pharmaceutics
Yanshan Gao, Yu Zhang, Gareth R Williams, Dermot O'Hare, Qiang Wang
Aqueous miscible organic layered double hydroxides (AMO-LDHs) can act as organophilic inorganic flame retardant nanofillers for unmodified non-polar polymers. In this contribution, AMO [Mg3Al(OH)8](CO3)0.5·yH2O LDH-oxidized carbon nanotube (AMO-LDH-OCNT) hybrids are shown to perform better than the equivalent pure AMO-LDH. A synergistic effect between the AMO-LDH and OCNT was observed; this endows the hybrid material with enhanced flame retardancy, thermal stability, and mechanical properties. The thermal stability of polypropylene (PP) was significantly enhanced by adding AMO-LDH-OCNT hybrids...
October 18, 2016: Scientific Reports
Zahed Shami, Seyed Mojtaba Amininasab, Pegah Shakeri
A straightforward approach was successfully developed to fabricate a well-designed three-dimensional rough sheetlike MgAl-layered double hydroxide (LDH) array to stand vertically on poly(acrylonitrile) porous nanofibrous membranes based on an electrospun-nanofiber-templated in situ hydrothermal strategy, and then the surface was modified with cyclohexanecarboxylic acid. The as-spun highly dense ordered sheetlike LDH porous nanofabric exhibited a superior durability in superhydrophobicity and superoleophilicity, which has achieved high oil-removing capability including both oil harvesting and oil separation to harvest/separate a wide range of organic solvents and oils from an oil-water mixture and, especially, exhibited a very good recycling and reusing performance...
October 17, 2016: ACS Applied Materials & Interfaces
Yu-Fei Song, Tengfei Li, Zelin Wang, Wei Chen, Haralampos N Miras
Intercalation catalysts, owing to the modular and accessible gallery and unique inter-lamellar chemical environment, have shown wide application in various catalytic reactions. However, the poor mass transfer between the active components of the intercalated catalysts and organic substrates is one of the challenges that limit their further application. Herein, we fabricate a novel heterogeneous catalyst by intercalating the polyoxometalate (POM) of Na9LaW10O36·32H2O (LaW10) into layered double hydroxides (LDHs), which has been covalently anchored by ionic liquids (ILs)...
October 17, 2016: Chemistry: a European Journal
Ping Li, Hua Chun Zeng
In recent years, metal-organic frameworks (MOFs) have been employed as heterogeneous catalysts or utilized as solid precursors for synthesis of catalytic materials. However, conventional MOFs and their derivatives, which normally have relatively large particle sizes, exhibit limited mass transfer and modest catalytic activities owing to lengthy diffusion path and less exposed active sites. On the other hand, it has been generally conceived that nanoscale MOFs will be beneficial to materials utilization as well as to mass diffusion, but the instability of nano-MOFs poses a serious issue on their practical applications...
October 14, 2016: ACS Applied Materials & Interfaces
Rajamani Nagarajan, Pankaj Gupta, Poonam Singh, Pinki Chakraborty
Given the fact that the literature describing the intercalation of organic molecules in monometallic LDH systems is scarce, the present investigation is aimed at the generation of ethylene glycol intercalated Fe(II)-Fe(III) LDH with the objective of enhancing the surface area for further catalytic applications of industrially important and environmentally harmful organics. The solvothermal reaction of FeCl3 with urea in an ethylene glycol medium yielded a brown colored powder which was characterized employing a wide range of analytical techniques including high resolution powder X-ray diffraction (PXRD), scanning electron microscopy, thermal analysis, X-ray photo electron spectroscopy (XPS), elemental (C, H, N and S) analysis, UV-visible, photoluminescence spectroscopy measurements, BET surface area and pore-size analysis...
October 14, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
Cinzia Pagano, Maria Cristina Tiralti, Luana Perioli
OBJECTIVES: Folic acid (FA) is an important source for the prevention of many diseases. However, its use is limited because the very low solubility (<10 mg/l particularly in the gastric environment) responsible for the incomplete adsorption of the administered dose. This study proposes a technological strategy to overcome this problem enhancing FA dissolution rate by means of a formulation able to make completely bioavailable the whole administered dose. METHODS: Folic acid was intercalated in the layered double hydroxides (LDHs) MgAl-LDH and ZnAl-LDH...
October 13, 2016: Journal of Pharmacy and Pharmacology
Myung Hun Kim, Woojune Hur, Goeun Choi, Hye Sook Min, Tae Hyun Choi, Young Bin Choy, Jin-Ho Choy
A bioabsorbable polymeric bone plate enabled with both diagnostic and therapeutic functionalities (radiopacity and sustained drug release, respectively) is proposed. To this end, a drug-inorganic nanohybrid (RS-LDH) is examined as a theranostic agent by intercalating an anti-resorptive bone remodeling drug, risedronate (RS) into a layered double hydroxide (LDH) via an ion-exchange reaction. The RS-LDH is prepared as a sheet with a biodegradable polymer, poly(lactic-co-glycolic acid), and is then attached onto the clinically approved bioabsorbable bone plate to produce the theranostic plate...
October 10, 2016: Advanced Healthcare Materials
Chunsheng Lei, Xiaofeng Zhu, Bicheng Zhu, Chuanjia Jiang, Yao Le, Jiaguo Yu
The preparation of hierarchical porous materials as catalysts and sorbents has attracted much attention in the field of environmental pollution control. Herein, Ni/Mg/Al layered double hydroxides (NMA-LDHs) hierarchical flower-like hollow microspheres were synthesized by a hydrothermal method. After the NMA-LDHs was calcined at 600°C, NMA-LDHs transformed into Ni/Mg/Al layered double oxides (NMA-LDOs), which maintained the hierarchical flower-like hollow structure. The crystal phase, morphology, and microstructure of the as-prepared samples were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy elemental mapping, Fourier transform infrared spectroscopy, and nitrogen adsorption-desorption methods...
September 30, 2016: Journal of Hazardous Materials
Na Tian, Xike Tian, Xiangwen Liu, Zhaoxin Zhou, Chao Yang, Longlong Ma, Chen Tian, Yong Li, Yanxin Wang
The highly dispersed iron layered double hydroxide (Fe-LDH) nanoplates supported on sepiolite (SEP) nanofibers have been successfully prepared via in situ co-precipitation of an iron salt precursor. The as-obtained hierarchical dendrite-like Fe-LDH/SEPs possess high specific area, and exhibit excellent removal ability for arsenic, demonstrating promising potential in environment applications.
September 29, 2016: Chemical Communications: Chem Comm
Sumio Iijima, Takashi Yumura, Zheng Liu
We report the discovery of a 1D crystalline structure of aluminum oxyhydroxide. It was found in a commercial product of fibrous pseudoboehmite (PB), γ-AlOOH, synthesized easily with low cost. The thinnest fiber found was a ribbon-like structure of only two layers of an Al-O octahedral double sheet having a submicrometer length along its c axis and 0.68-nm thickness along its b axis. This thickness is only slightly larger than half of the lattice parameter of the b-axis unit cell of the boehmite crystal (b/2 = 0...
October 5, 2016: Proceedings of the National Academy of Sciences of the United States of America
Daniel Saliba, Mazen Al-Ghoul
We report the synthesis of magnesium-aluminium layered double hydroxide (LDH) using a reaction-diffusion framework (RDF) that exploits the multiscale coupling of molecular diffusion with chemical reactions, nucleation and growth of crystals. In an RDF, the hydroxide anions are allowed to diffuse into an organic gel matrix containing the salt mixture needed for the precipitation of the LDH. The chemical structure and composition of the synthesized magnesium-aluminium LDHs are determined using powder X-ray diffraction (PXRD), thermo-gravimetric analysis, differential scanning calorimetry, solid-state nuclear magnetic resonance (SSNMR), Fourier transform infrared and energy dispersive X-ray spectroscopy...
November 13, 2016: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
Praveen Thallapally, Debasis Banerjee, Sameh K Elsaidi, Briana Aguila, Baiyan Li, Dong Sang Kim, Mike Schweiger, Ma Shengquian, Albert A Kruger
Efficient and cost-effective removal of radioactive pertechnetate anions from legacy nuclear waste is a key challenge to mitigate long-term nuclear waste storage issues. Traditional materials such as resins and layered double hydroxides (LDHs) were evaluated for their pertechnetate or its non-radioactive surrogate perrhenate removal capacity, but there is room for improvement in terms of capacity, selectivity and kinetics. A series of functionalized hierarchical porous frameworks were evaluated for their perrhenate removal capacity in the presence of other competing anions...
September 29, 2016: Chemistry: a European Journal
Zhen Liu, Zhongyuan Huang, Feifei Cheng, Zhanhu Guo, Guangdi Wang, Xu Chen, Zhe Wang
Durable, highly efficient, and economic sound electrocatalysts for CO electrooxidation (COE) are the emerging key for wide variety of energy solutions, especially fuel cells and rechargeable metal-air batteries. Herein, we report the novel system of nickel-aluminum double layered hydroxide (NiAl-LDH) nanoplates on carbon nanotubes (CNTs) network. The formulation of such complexes system was to be induced through the assistance of gold nanoparticles in order to form dual-metal active sites so as to create a extended Au/NiO two phase zone...
2016: Scientific Reports
Hong-Jie Peng, Ze-Wen Zhang, Jia-Qi Huang, Ge Zhang, Jin Xie, Wen-Tao Xu, Jia-Le Shi, Xiang Chen, Xin-Bing Cheng, Qiang Zhang
A cooperative interface constructed by "lithiophilic" nitrogen-doped graphene frameworks and "sulfiphilic" nickel-iron layered double hydroxides (LDH@NG) is proposed to synergistically afford bifunctional Li and S binding to polysulfides, suppression of polysulfide shuttle, and electrocatalytic activity toward formation of lithium sulfides for high-performance lithium-sulfur batteries. LDH@NG enables high rate capability, long lifespan, and efficient stabilization of both sulfur and lithium electrodes.
September 15, 2016: Advanced Materials
Shujun Yu, Xiangxue Wang, Zhongshan Chen, Jian Wang, Suhua Wang, Tasawar Hayat, Xiangke Wang
Aniline is toxic and hard to be degraded, and thereby causes the environmental pollution seriously. Herein, a practical and green hydrothermal method was applied to fabricate terephthalic acid and pyromellitic acid intercalated layered double hydroxides (LDH) (named as TAL and PAL) for aniline efficient removal. The sorption of aniline on LDH-based materials were investigated at different experimental conditions, and the results indicated that aniline sorption on LDH, TAL and PAL were strongly dependent on pH and independent of ionic strength...
September 5, 2016: Journal of Hazardous Materials
Suraj Shiv Charan Pushparaj, Nicholai Daugaard Jensen, Claude Forano, Gregory J Rees, Vanessa Prevot, John V Hanna, Dorthe B Ravnsbæk, Morten Bjerring, Ulla Gro Nielsen
Bayerite was treated under hydrothermal conditions (120, 130, 140, and 150 °C) to prepare a series of layered double hydroxides (LDHs) with an ideal composition of ZnAl4(OH)12(SO4)0.5·nH2O (ZnAl4-LDHs). These products were investigated by both bulk techniques (powder X-ray diffraction (PXRD), transmission electron microscopy, and elemental analysis) and atomic-level techniques ((1)H and (27)Al solid-state NMR, IR, and Raman spectroscopy) to gain a detailed insight into the structure of ZnAl4-LDHs and sample composition...
September 19, 2016: Inorganic Chemistry
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