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Qian Zhao, Qizhen Zhu, Jiawei Miao, Zhaoruxin Guan, Huan Liu, Renjie Chen, Yabin An, Feng Wu, Bin Xu
With the high energy density of 2600 Wh kg-1, lithium-sulfur (Li-S) batteries have been considered as one of the most promising energy storage systems. However, the serious capacity fading resulting from shuttle effect hinders its commercial application. Encapsulating small S2-4 molecules into the pores of ultra-microporous carbon (UMC) can eliminate the dissolved polysulfudes, thus completely inhibit the shuttle effect. Nevertheless, the sulfur loading of S2-4/UMC is usually not higher than 1 mg cm-2 due to the limited pore volume of UMC, which is a great challenge for small sulfur cathode...
March 13, 2018: ACS Applied Materials & Interfaces
Lygie Esquirol, Thomas S Peat, Matthew Wilding, Jian-Wei Liu, Nigel G French, Carol J Hartley, Hideki Onagi, Thomas Nebl, Christopher J Easton, Janet Newman, Colin Scott
Cyanuric acid is a metabolic intermediate of s-triazines, such as atrazine (a common herbicide) and melamine (used in resins and plastics). Cyanuric acid is mineralized to ammonia and carbon dioxide by the soil bacterium Pseudomonas sp. strain ADP via three hydrolytic enzymes (AtzD, AtzE, and AtzF). Here, we report the purification and biochemical and structural characterization of AtzE. Contrary to previous reports, we found that AtzE is not a biuret amidohydrolase, but instead catalyzes the hydrolytic deamination of 1-carboxybiuret...
March 9, 2018: Journal of Biological Chemistry
Wei Li, Yongping Zheng, Tingwei Zhang, Songjie Wu, Jue Zhang, Jing Fang
Molecularly imprinted polymer (MIP) films prepared by bulk polymerization suffer from numerous deficiencies, including poor mass transfer ability and difficulty in controlling reaction rate and film thickness, which usually result in poor repeatability. However, polymer film synthesized by electropolymerization methods benefit from high reproducibility, simplicity and rapidity of preparation. In the present study, an Au film served as the refractive index-sensitive metal film to couple with the light leaked out from optical fiber core and the electrode for electropolymerizing MIP film simultaneously...
March 9, 2018: Sensors
Onur Ulker
This paper describes a study of the quantify surface roughness of experimentally manufactured particleboards and sandwiched panels having fibers on the surface layers. Surface quality of specimens before and after being overlaid with thin melamine impregnated papers was determined by employing profilometer equipment. Roughness measurements and Janka hardness were carried out on the specimens conditioned at 60% and 95% relative humidity levels. Based on the findings in this work, surface roughness of the specimens that were exposed two relative humidity exposure showed significant differences from each others...
March 9, 2018: Materials
Guangyuan Ren, Liangliang Gao, Chao Teng, Yunan Li, Hequn Yang, Jianglan Shui, Xianyong Lu, Ying Zhu, Liming Dai
The method of fabricating non-precious-metal electrocatalysts with high activity and durability through a facile and eco-friendly procedure is of great significance to the development of low cost fuel cells and metal-air batteries. Herein, we present that an ancient chemical reaction of "Pharaoh's snakes" can be a fast and convenient technique to prepare Fe/N-doped carbon nanosheets/nanotubes (Fe/N-C) electrocatalysts with sugar, soda, melamine and iron nitrate as precursors. The resultant Fe/N-C catalyst has a hierarchically porous structure, large surface area and uniformly distributed active sites...
March 9, 2018: ACS Applied Materials & Interfaces
Ani Wang, Ruiqing Fan, Xuesong Zhou, Sue Hao, Xubin Zheng, Yulin Yang
Particulate matters (PMs) air pollution has become a serious environmental issue due to its great threat to human health. Herein, metal-organic complexes PBM-Zn1 and PBM-Zn2 coatings (noted as PBM-Zn-Filter) have been produced by hot-pressing method on various substrates for the first time. Layer-by-layer PBM-Zn-Filters were also obtained through varying hot-pressing cycles. The obtained PBM-Zn-Filters with high robustness show excellent performance in PMs removal. Especially, benefiting from larger conjugation system, micropore structure, lower pressure drop, higher electrostatic potential ζ and electron cloud exposed metal center of PBM-Zn2 (DFT calculations), PBM-Zn2@melamine foam-4 gives the highest removal rates, PM2...
March 5, 2018: ACS Applied Materials & Interfaces
Ramin Nikzad-Langerodi, Edwin Lughofer, Carlos Cernuda, Thomas Reischer, Wolfgang Kantner, Marcin Pawliczek, Markus Brandstetter
The physico-chemical properties of Melamine Formaldehyde (MF) based thermosets are largely influenced by the degree of polymerization (DP) in the underlying resin. On-line supervision of the turbidity point by means of vibrational spectroscopy has recently emerged as a promising technique to monitor the DP of MF resins. However, spectroscopic determination of the DP relies on chemometric models, which are usually sensitive to drifts caused by instrumental and/or sample-associated changes occurring over time...
July 12, 2018: Analytica Chimica Acta
Nasser A M Barakat, Ahmed G El-Deen, Zafar Khan Ghouri, Saeed Al-Meer
NiFe nanoparticles-decorated & N-doped graphene is introduced as an effective and stable non-precious electrocatalyst for ORR in the acid medium. Compared to conventional Pt/C electrodes under the same conditions, the proposed nanocatalyst shows closer onset potential and current density. Typically, the observed onset potentials and current densities for the synthesized and Pt/C electrodes are 825 and 910 mV (vs. NHE) and -3.65 and -4.31 (at 5 mV.s-1 ), respectively. However, the most important advantage of the introduced metallic alloy-decorated graphene is its distinct stability in acid medium; the retention in the electrocatalytic performance after 1,000 successive cycles is approximately 98%...
February 28, 2018: Scientific Reports
Shengnan Xu, Minghao Sun, Allen Thompson, Zhiqiang Hu
Melamine is recalcitrant and toxic to bacteria in conventional activated sludge systems. In this study, we investigated the degradation and toxicity of melamine in a membrane bioreactor (MBR) system operated at high activated sludge concentrations (∼8.5 g TSS/L). Melamine was dosed at 3 mg/L for about 100 days. The average melamine removal efficiency in the MBR system was 20 ± 11%. Meanwhile, batch studies showed the acclimated sludge from the MBR had higher removal efficiencies after the depletion of readily biodegradable substrate (acetate) while non-acclimated sludge did not remove any melamine...
February 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Jintao Wang, Hongfei Wang, Guihong Geng
The fabrication of the materials with special wettability being capable of removing oil layer on water surface and oil droplets in oil-in-water emulsion is an important issue for water pollution. So far, it still remains challenging to explore a simple, facile, environmentally friendly approach for achieving this goal. Herein, inspired by the adhesion of marine mussels, the polydopamine (PDA) coating with hierarchical structure was directly fabricated onto the surface of melamine (MF) sponge by facile self-polymerization in dopamine solution...
February 2018: Marine Pollution Bulletin
Anchi Yu, Jing Wen, Ruiyu Li, Rong Lu
Graphitic carbon nitride (g-CN) is one potential metal-free photocatalyst. The photocatalytic mechanism of g-CN is involved with its building unit heptazine ring. Melem is the simplest heptazine-based compound and g-CN is its polymeric product. Thus, studies on the photophysical property of melem will help to understand the photocatalytic mechanism of heptazine-based materials. In this work, we systematically explored the spectroscopic features of melem through measuring its absorption spectrum, fluorescence spectrum and fluorescence decay, respectively...
February 23, 2018: Chemistry, An Asian Journal
Nagendran Tharmalingam, Rajmohan Rajmuthiah, Wooseong Kim, Beth Burgwyn Fuchs, Elamparithi Jeyamani, Michael J Kelso, Eleftherios Mylonakis
There is an urgent need for the discovery of effective new antimicrobial agents to combat the rise of bacterial drug resistance. High-throughput screening (HTS) in whole-animal infection models is a powerful tool for identifying compounds that show antibacterial activity and low host toxicity. In this report, we characterize the activities of four novel antistaphylococcal compounds identified from an HTS campaign conducted using Caenorhabditis elegans nematodes infected with methicillin-resistant Staphylococcus aureus (MRSA)...
February 20, 2018: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
Yike Li, Lingyu Dong, Xiangfeng Wang, Yuan Liu, Hailing Liu, Mengxia Xie
A novel fluorescent immunosensor for determination of alpha fetoprotein (AFP) in serum samples has been developed based on the nano graphite carbon nitride (g-C 3 N 4 ) as fluorophore and immunomagnetic beads (MBs) as separation material. The bulk g-C 3 N 4 was obtained by thermal polymerization of melamine, and then carboxylated and exfoliated to acquire the carboxylated nano g-C 3 N 4 (c-n-g-C 3 N 4 ), which has been characterized and the results showed that it had excellent fluorescent properties. The antibodies of AFP (Ab 1 , Ab 2 ) were conjugated to the MBs and the c-n-g-C 3 N 4 , respectively...
February 7, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Jose M González-Domínguez, Verónica León, María Isabel Lucío, Maurizio Prato, Ester Vázquez
Graphene has promising physical and chemical properties such as high strength and flexibility, coupled with high electrical and thermal conductivities. It is therefore being incorporated into polymer-based composites for use in electronics and photonics applications. A main constraint related to the graphene development is that, being of a strongly hydrophobic nature, almost all dispersions (usually required for its handling and processing toward the desired application) are prepared in poisonous organic solvents such as N-methyl pyrrolidone or N,N-dimethyl formamide...
March 2018: Nature Protocols
Hui-Juan Yang, Hong Yang, Yu-Hao Hong, Peng-Yang Zhang, Tao Wang, Li-Na Chen, Feng-Yang Zhang, Qi-Hui Wu, Na Tian, Zhi-You Zhou, Shi-Gang Sun
Cu is a unique catalyst for CO 2 electroreduction, since it can catalyze CO 2 reduction to a series of hydrocarbons, alcohols, and carboxylic acids. Nevertheless, such Cu catalysts suffer from poor selectivity. High pressure of CO 2 is considered to facilitate the activity and selectivity of CO 2 reduction. Herein, a new strategy is presented for CO 2 reduction with improved C 2 H 4 selectivity on a Cu catalyst by using CO 2 capture materials as the support at ambient pressure. N-doped carbon (N x C) was synthesized through high-temperature carbonization of melamine and l-lysine...
February 15, 2018: ChemSusChem
Guixian Liu, Xingdu Qiao, M A Gondal, Yun Liu, Kai Shen, Qingyu Xu
Graphitic carbon nitride (g-C3N4) and sulfur-doped g-C3N4 were prepared by pyrolysis of melamine and thiourea respectively. Their comparative performance was investigated for photo-degradation of a Rhodamine B (RhB) an organic toxic pollutant. The crystal structure, morphology, microscopic components and properties of the synthesized samples were characterized by XRD, TEM, FT-IR, photoluminescence (PL) emission spectroscopy and zeta potential. TG-DTA is a record of the process for pyrolysis of thiourea. Two simplified kinetic models, pseudo-first-order and pseudo-second-order were applied to predict the adsorption rate constants...
June 1, 2018: Journal of Nanoscience and Nanotechnology
Yasmina M Abd-Elhakim, Khlood M El Bohi, Sahar Khalifa Hassan, Shorouk El Sayed, Sabry M Abd-Elmotal
Melamine (MEL) is a widespread food contaminant and adulterant. Moringa olifera is a widely known medicinal plant with various pharmacological properties. Herein, this study aimed to investigate, for the first time, the probable protective or therapeutic role of M. olifera ethanolic extract (MOE) against MEL induced hemato-immune toxic hazards. Fifty Sprague Dawely male rats were orally treated with distilled water, MOE (800 mg/kg bw), MEL (700 mg/kg bw), MOE/MEl or MOE + MEl. Erythrogram and leukogram profiling were evaluated to assess hematological status...
February 10, 2018: Food and Chemical Toxicology
Xiudan Hou, Xiaofeng Lu, Panhong Niu, Sheng Tang, Licheng Wang, Yong Guo
A new three-dimensional graphene oxide wrapped melamine foam was prepared and used as a solid-phase extraction substrate. β-Cyclodextrin was fabricated onto the surface of three-dimensional graphene oxide-wrapped melamine foam by a chemical covalent interaction. In view of a specific surface area and a large delocalized π electron system of graphene oxide, combing with a hydrophobic interior cavity and a hydrophilic peripheral face of β-cyclodextrin, the prepared extraction material was proposed for the determination of flavonoids...
February 12, 2018: Journal of Separation Science
Muzammil Anjum, Rajeev Kumar, M A Barakat
Visible light photocatalysts of Cr2O3/C3N4 composites (with different melamine concentrations) were prepared by high temperature calcination method. The composites samples were characterized by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), scanning electron microscopy SEM, energy-dispersive X-ray spectroscopy (EDX), UV-visible spectroscopy and particle size analysis, which clearly indicated the coexistence of both Cr2O3 and C3N4 in the composites. The Cr2O3/C3N4 catalysts were tested for photocatalytic degradation of 2-chlorophenol in wastewater and solubilization of sludge in anaerobic digestion process to enhance biomethane production...
February 8, 2018: Journal of Environmental Management
Min Wang, Pengyao Guo, Yu Zhang, Chunmei Lv, Tingyu Liu, Tianyu Chai, Yuanhua Xie, Youzhao Wang, Tong Zhu
A series of hollow structure lantern-like Eu(III)-doped g-C3N4 (xEu-CN, x = 1, 2, 3) was firstly synthesized by heating a mixture of melamine, HNO3 and Eu2O3 at 500 °C for 2 h. The phase, morphology and optical properties of the serial xEu-CN samples were characterized by different techniques, including TEM, XRD, FT-IR, SEM, XPS, BET, UV-vis, PL, photocurrent, and EIS. The results indicated that Eu doping extraordinarily enhanced the photocatalytic activity of pure g-C3N4, and the 2Eu-CN exhibited the highest photocatalytic performance with a 98% (82%) degradation rate for RhB (TC), 6...
February 3, 2018: Journal of Hazardous Materials
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