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Ning Huang, Hannah Drake, Jialuo Li, Jiangdong Pang, Ying Wang, Shuai Yuan, Qi Wang, Peiyu Cai, Junsheng Qin, Hong-Cai Zhou
The development of new types of porous composite materials is of great significance owing to their potentially improved performance over those of individual components and extensive applications in separation, energy storage, and heterogeneous catalysis. In this work, we integrated mesoporous metal-organic frameworks (MOFs) with macroporous melamine foam (MF) using a one-pot process, generating a series of MOF/MF composite materials with preserved crystallinity, hierarchical porosity, and increased stability over that of melamine foam...
May 18, 2018: Angewandte Chemie
Guifang Ge, Xinwen Guo, Chunshan Song, Zhongkui Zhao
Developing a facile method to overcome the intrinsic shortcomings of g-C3N4 photocatalyst concerning its insufficient visible-light absorption and dissatisfactory separation efficiency of charge carriers is of great significance but remains a challenge. In this work, we report, for the first time, a sapiential strategy for preparing highly-efficient nitrogen deficient g-C3N4 featuring bunchy microtubes (R-TCN) via a KOH-assisted hydrothermal treatment of rodlike melamine-cyanuric acid supramolecular aggregates (RMCA) followed by heating the reconstructed RMCA, in which KOH serves as an all-rounder for breaking hydrogen bonds, accelerating hydrolysis of melamine and nitrogen defects forming...
May 18, 2018: ACS Applied Materials & Interfaces
Guangyang Liu, Ruonan Zhang, Xiaodong Huang, Lingyun Li, Naixin Liu, Jing Wang, Donghui Xu
Various highly sensitive and selective analytical methods have been used to monitor metsulfuron-methyl residue in the environment. However, these methods involve costly instruments and complex, time-consuming operations performed in laboratories. Here, a rapid, convenient, and sensitive colorimetric sensor based on anti-aggregation of gold nanoparticles (AuNPs) is demonstrated for the rapid detection of metsulfuron-methyl in agricultural irrigation water. The AuNPs could be induced to aggregate in the presence of melamine and exhibited a distinct color change from wine-red to blue...
May 17, 2018: Sensors
Siying Liu, Xiang-Dong Tian, Yun Zhang, Jian-Feng Li
The realization of surface-enhanced Raman spectroscopy (SERS) to be a reliable quantitative analytical technique requires sensitive and reproducible enhancing substrates. Here, uniform three-dimensional (3D) Ag nanorod (AgNR) substrates with well-defined interlayer spacings are prepared through the air-liquid interface-assisted self-assembly of AgNR in a layer-by-layer manner. The correlation of the SERS performance with the 3D AgNR structures is performed by SERS mapping the substrates. SERS mapping reveals the excellent enhancement uniformity of the 3D substrates with the relative standard deviation (RSD) less than 10%...
May 17, 2018: Analytical Chemistry
De-Shan Bin, Xi-Jie Lin, Yong-Gang Sun, Yan-Song Xu, Ke Zhang, An-Min Cao, Lijun Wan
K-ion batteries (KIBs) are now drawing increasing research interest as an inexpensive alternative to Li-ion batteries (LIBs). However, due to the large size of K+, stable electrode materials capable of sustaining the repeated K+ in-tercalation/deintercalation cycles are extremely deficient especially if a satisfactory reversible capacity is expected. Herein, we demonstrated that the structural engineering of carbon into a hollow interconnected architecture, a shape similar to the neuron-cell network, promised high conceptual and technological potential for a high-performance KIBs anode...
May 17, 2018: Journal of the American Chemical Society
Xiaojuan Liu, Ningning Xu, Panpan Gai, Feng Li
Since melamine is a strong hazard to human health, the development of new methods for highly sensitive detection of melamine is highly desirable. Herein, a novel fluorescent biosensing strategy was designed for sensitive and selective melamine assay based on the recognition ability of abasic (AP) site in triplex towards melamine and signal amplification by Mg2+ -dependent DNAzyme. In this strategy, the melamine-induced formation of triplex DNA was employed to trigger the strand displacement reaction (SDR). The SDR process converted the specific target recognition into the release and activation of Mg2+ -dependent DNAzyme, which could catalyze the cleavage of fluorophore/quencher labeled DNA substrate (FQ), resulting in a significantly increased fluorescent signal...
August 1, 2018: Talanta
Mengqi Wang, Yimei Tian, Xin Zhao, Xiang Li
High color concentrations in inflows at reclaimed water treatment plants are typically considered as emergency situations, which must be solved using an appropriate decolorizing process. Using the decoloration mechanism of a modified dicyandiamide-formaldehyde polymer (DFP), a urea-formaldehyde polymer and a melamine-formaldehyde polymer (MFP) were prepared with ammonium chloride and ammonium sulfate as the modifiers. An orthogonal experiment indicated that a modified urea-formaldehyde polymer had no effect on decolorization; however, the MFP modified by ammonium chloride in number 16 (MMFP-C16), the DFP modified by ammonium chloride in number 9 (MDFP-C9) and modified by ammonium sulfate in number 6 (MDFP-S6) were successful...
May 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Peifang Wang, Xiang Guo, Lei Rao, Chao Wang, Yong Guo, Lixin Zhang
A TiO2 /g-C3 N4 composite photocatalytic film was prepared by in situ synthesis method and its photocatalytic capability under weak-visible-light condition was studied. The co-precursor with different ratio of melamine and TiO2 sol-gel precursor were treated using ultrasonic mixing, physical deposition, and co-sintering method to form the smooth, white-yellow, and compact TiO2 /g-C3 N4 composite films. The prepared TiO2 /g-C3 N4 materials were characterized by SEM, TEM, EDS, XRD, BET, VBXPS, and UV-vis diffuse reflectance spectra...
May 10, 2018: Environmental Science and Pollution Research International
Chao Zhang, Yuming Zhou, Jiehua Bao, Xiaoli Sheng, Jiasheng Fang, Shuo Zhao, Yiwei Zhang, Wenxia Chen
The halogen elements modification strategy of TiO2 encounters a bottleneck in visible-light H2 production. Herein, we have for the first time reported a hierarchical honeycomb Br, N codoped anatase TiO2 catalyst (HM-Br,N/TiO2) with enhanced visible-light photocatalytic H2 production. During the synthesizing process, large amounts of meso-macroporous channels and TiO2 nanosheets were fabricated in massive TiO2 automatically, constructing the hierarchical honeycomb structure with large specific surface area (464 m2 g-1)...
May 10, 2018: ACS Applied Materials & Interfaces
Shu Huan Ren, Shi Gang Liu, Yu Ling, Nian Bing Li, Hong Qun Luo
Herein, we report a facile method to synthesize red-emitting, water-soluble Ag nanoclusters (Ag NCs) employing lipoic acid as a stabilizing agent. The Ag NCs show aggregation-induced emission property and have good stability and optical properties. Cu2+ can disperse the aggregated Ag NCs, accompanied by the quenching of fluorescence. However, the formed Cu2+ -melamine complex by the coordination chemistry between free copper ion and melamine is able to effectively avoid the quenching process of Cu2+ to the Ag NCs...
May 1, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Leonard Heymann, Björn Schiller, Heshmat Noei, Andreas Stierle, Christian Klinke
Poly(triazine imide) (PTI) is a material belonging to the group of carbon nitrides and has shown to have competitive properties compared to melon or g-C3 N4 , especially in photocatalysis. As most of the carbon nitrides, PTI is usually synthesized by thermal or hydrothermal approaches. We present and discuss an alternative synthesis for PTI which exhibits a pH-dependent solubility in aqueous solutions. This synthesis is based on the formation of radicals during electrolysis of an aqueous melamine solution, coupling of resulting melamine radicals and the final formation of PTI...
April 30, 2018: ACS Omega
Thi Ha Nguyen, Thanh Danh Nguyen, Nguyen Hoang Ly, Cheol Hwan Kwak, Yun Suk Huh, Sang-Woo Joo
We report a facile method for sample preparation and sensitive on-site detection of melamine in powdered infant formula and chocolate using Raman spectroscopy on sharp-edged gold nanostars (AuNSs). The aggregation of AuNSs by sodium chloride (1.2 M) facilitates the more sensitive detection of melamine in comparison with spherical gold nanoparticles (AuNPs). Density functional theory quantum mechanical calculations were performed to determine the energetic stability on gold cluster atoms. Our spectroscopic data indicated that AuNSs are an efficient platform for detecting melamine in food mixtures...
May 4, 2018: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
Bin Ren, Tiecheng Wang, Guangzhou Qu, Fang Deng, Dongli Liang, Wenli Yang, Meishan Liu
As a highly active photocatalyst, g-C3 N4 /TiO2 heterojunction nanocomposites were in situ synthesized by simple ultrasonic mixing and calcination by using TiO2 and melamine as precursors. The morphology and structure of the prepared photocatalysts were characterized by field emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Fourier-transform infrared spectroscopy, UV-Vis diffuse reflectance spectroscopy, and X-ray photoelectron spectroscopy. The photocatalytic activities of g-C3 N4 /TiO2 nanocomposites to degrade Orange II (AO7) under visible light irradiation were evaluated...
May 4, 2018: Environmental Science and Pollution Research International
Haibo Tan, Jing Tang, Joel Henzie, Yunqi Li, Xingtao Xu, Tao Chen, Zhongli Wang, Jiayu Wang, Yusuke Ide, Yoshio Bando, Yusuke Yamauchi
Triblock copolymer micelles coated with melamine-formaldehyde resin were self-assembled into closely-packed two-dimensional arrangements on the surface of graphene oxide sheets. Carbonizing these structures created a two-dimensional architecture composed of reduced graphene oxide (rGO) sandwiched between two monolayers composed of sub-40-nm diameter hollow nitrogen-doped carbon nanospheres (N-HCNS). Electrochemical tests showed that these hybrid structures had better performance for the oxygen reduction compared to physically mixed rGO and N-HCNS that were not chemically bonded together...
May 3, 2018: ACS Nano
Guanghua Li, Du Wang, Aijun Zhou, Yimin Sun, Qi Zhang, Amnart Poapolathep, Li Zhang, Zhiyong Fan, Zhaowei Zhang, Peiwu Li
To ensure protein beverage safety and prevent illegal melamine use to artificially increase protein content, a rapid, onsite, ultrasensitive detection method for melamine must be developed because melamine is detrimental to human health and life. Herein, an ultrasensitive time-resolved fluorescence detection paper (TFDP) was developed to detect melamine in protein beverages within 15 min using a one-step sample preparation. The lower limits of detection were 0.89, 0.94, and 1.05 ng/mL, and the linear ranges were 2...
May 2, 2018: Journal of Agricultural and Food Chemistry
Hoonsoo Lee, Moon S Kim, Santosh Lohumi, Byoung-Kwan Cho
Extensive research has been conducted on non-destructive and rapid detection of melamine in powdered foods in the last decade. While Raman and near-infrared (NIR) hyperspectral imaging techniques have been successful in terms of non-destructive and rapid measurement, they have limitations with respect to measurement time and detection capability, respectively. Therefore, the objective of this study was to develop a mercury cadmium telluride (MCT)-based short wave infrared (SWIR) hyperspectral imaging system and algorithm to detect melamine quantitatively in milk powder...
May 2, 2018: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
Yingying Sheng, Yi You, Zhong Cao, Lei Liu, Hai-Chen Wu
We have developed a rapid and selective approach for the detection of melamine based on simple DNA probes and α-hemolysin nanopores. The limit of detection can be as low as 10 pM.
April 27, 2018: Analyst
James M Harnly, Marti M Bergana, Kristie M Adams, Jeffrey C Moore, Zhuohong Xie
1H-NMR spectra for 66 commercial powdered milk samples were analyzed by PCA, SIMCA, and pooled, crossed ANOVA. It was found that the sample type (skim milk powder or non-fat dry milk), the supplier, the production site, the processing temperature (high, medium, or low temperature), and the day of analysis provided statistically significant sources of variation. Interestingly, inexact alignment (deviations of ±0.002 ppm) of the spectral reference peak was a significant source of variation and fine alignment was necessary before the variation arising from the other experimental factors could be accurately evaluated...
April 26, 2018: Journal of Agricultural and Food Chemistry
Wen-Lin Li, Fan-Zhi Kong, Qiang Zhang, Wei-Wen Liu, Hao Kong, Xiao-Ping Liu, Muhammad-Idrees Khan, Amir Wahid, Shah Saud, Hua Xiao, Cheng-Xi Cao, Liu-Yin Fan
Melamine was sometimes adulterated to dairy products for false protein content increase in developing countries. However, portable sensor has not been developed for on-spot determination of melamine in dairy products yet. Herein, a distance-based sensor was advanced for the quantification of melamine in dairy products based on chip electrophoretic titration (ET) of moving neutralization boundary (NB) and EDTA photo-catalysis. In the chip sensor, EDTA, H2O2 and leucomalachite green (LMG) were added in the anode well...
April 26, 2018: Analytical Chemistry
Li Zhang, Tiehu Li, Lei Huang, Zhengqin Ye, Zhongbin Ye, Xin Yan, Lili Li, Qiang Deng, Gang Chen, Jie Zhang, Zhifang Zhang
In this paper, a series of poly ammonium shale inhibitors were prepared from diethylamine, epichlorohydrin, and melamine (DEM) and their inhibition to shale were evaluated by bentonite linear expansion test, anti-swelling experiments, and mud ball experiments. Additionally, other properties of drilling fluid treated by poly ammonium were evaluated. Anti-swelling results showed that anti-swelling rate of DEM-8 reaches up to 97.8% when its concentration reaches to 0.8%. Mud ball experiment and drilling fluid evaluation showed DEM-8 has strong inhibitive capability to bentonite hydration swelling and controlling the particle size of bentonite in a large scale...
April 25, 2018: Chemistry Central Journal
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