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Xiaoli Wu, Pengsi Wang, Shaoyan Hou, Peiling Wu, Jian Xue
Organophosphorus pesticides (OPs) are frequently for pest control in the agriculture industry. Accumulation of OPs is harmful to the environment and human health. Thus, facile and portable detection of organophosphorus pesticides is of great importance. Among these methods, the fluorescence assay holds the advantages of high sensitivity, simplicity, nondestructive properties. Conventional fluorophores have the drawbacks of poor photostability and low signal-to-noise ratio due to their aggregation-caused quenching drawbacks at high concentration or in the aggregate state...
June 1, 2019: Talanta
Ailong Li, Hideshi Ooka, Nadège Bonnet, Toru Hayashi, Yimeng Sun, Qike Jiang, Can Li, Hongxian Han, Ryuhei Nakamura
Efficient, earth-abundant, and acid-stable catalysts for the oxygen evolution reaction (OER) are missing pieces for the production of hydrogen via water electrolysis. Here, we report how the limitations on the stability of 3d-metal materials can be overcome by the spectroscopic identification of stable potential windows in which the OER can be catalyzed efficiently while simultaneously suppressing deactivation pathways. We demonstrate the benefits of this approach using gamma manganese oxide (γ-MnO2 ), which shows no signs of deactivation even after 8000 h of electrolysis at a pH of 2...
March 14, 2019: Angewandte Chemie
Lianghao Song, Tiantian Xu, Daowei Gao, Xun Hu, Cuncheng Li, Guozhu Chen
CeO2-based catalysts are widely studied in the catalysis fields. Developing one novel synthetic approach to increase the intimate contact between CeO2 and secondary species is of particular importance for enhancing catalytic activities. Herein, we design an interfacial reaction between C and KMnO4 to synthesize CeO2-MnO2, where the C is derived from the pyrolysis of Ce-MOFs CeO2 crystallites at high calcination temperature, and the intimate contact within CeO2/C is conveyed to CeO2/MnO2 after interfacial reaction, which are responsible for high catalytic activity of CeO2-MnO2 towards CO oxidation...
March 13, 2019: Chemistry: a European Journal
Shengkai Xu, Huaqi Bi, Guangqing Liu, Bensheng Su
Advanced and optimized textile wastewater treatment by catalytic ozonation and activated carbon (AC) adsorption was investigated. Scanning electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy indicated that Mn and Ce oxides were successfully loaded on the γ-Al2 O3 support, and MnO2 , Mn2 O3 , CeO2 and Ce2 O3 were the main components of the catalyst. Actual textile wastewater from biochemical effluent was used as experiment wastewater. The removal efficiencies of chemical oxygen demand (COD) and chromaticity were approximately 30...
March 12, 2019: Water Environment Research: a Research Publication of the Water Environment Federation
Yimei Zhang, Zhuang Chen, Lincheng Zhou, Panpan Wu, Yalong Zhao, Yuxian Lai, Fei Wang, Shuai Li
In this study, MnO2 /MWCNT hybrids, prepared using a solvothermal method, were coated onto Ni foam and then used as a cathode for tetrabromobisphenol A (TBBPA) degradation. The reaction was confirmed to exhibit the pseudo first-order kinetics. Compared with the original Ni foam cathode, the fabricated electrode exhibited higher catalytic activity, attributed to its strong cross-linking and ability to produce catalytic free radicals. Radical scavenger experiments revealed that O2 - and OH were involved in the decomposition of TBBPA...
January 23, 2019: Journal of Hazardous Materials
Junlin Sun, Feng Liu, Wenqian Yu, Qunying Jiang, Jialing Hu, Yahua Liu, Fuan Wang, Xiaoqing Liu
Glutathione (GSH) plays a vital role in biological systems and is associated with human pathology. The engineering of semiconductor quantum dots (QDs) as fluorescent probes for GSH sensing and bioimaging is a potential yet rarely reported approach. Herein, we report the in situ growth of manganese dioxide nanosheets (MnO2) on silica-coated semiconductor quantum dots (QD@SiO2), to prepare a stable and biocompatible fluorescent nanoprobe (QD@SiO2-MnO2) for the selective and sensitive detection of GSH. The modification of QD@SiO2 with MnO2 significantly quenched the fluorescence of CdSe/ZnS QDs, yet the addition of GSH efficiently recovered the fluorescence of the nanoprobe due to the decomposition of MnO2 by GSH...
March 6, 2019: Nanoscale
Jang Mee Lee, Bohyun Kang, Yun Kyung Jo, Seong-Ju Hwang
A scalable organic-intercalant-free liquid-exfoliation route to 2D nanosheets (NSs) of layered transition metal oxides (TMOs) is developed by employing hydronium-intercalated derivatives as precursors. The replacement of interlayer alkali metal ions with larger hydronium ions via acid-treatment makes possible the efficient liquid-exfoliation of TMOs without any assistance of organic intercalant cations. Not only a weakening of interlayer electrostatic interaction upon hydronium-intercalation but also an efficient solvation of deintercalated hydronium ions via hydrogen bonding with polar solvents is mainly responsible for the high efficacy of hydronium-intercalated TMOs as precursors for liquid-exfoliation...
March 6, 2019: ACS Applied Materials & Interfaces
Qiu Jian Le, Ming Huang, Tian Wang, Xiao Ying Liu, Lidong Sun, Xiao Long Guo, De Bin Jiang, Jinshu Wang, Fan Dong, Yu Xin Zhang
Natural diatomite with abundant pores was used as a biotemplate for the massive production of three-dimensional (3D) porous graphene by chemical vapor deposition method. Subsequent template removal and nitrogen doping treatment yield nitrogen doped 3D graphene with preserved shape and complex internal features of the diatomite. After further deposition with MnO2 nanosheets, the N-doped 3D graphene@MnO2 (N-G@MnO2 ) hybrid exhibited excellent supercapacitor and good oxygen reduction reaction (ORR) performance...
February 27, 2019: Journal of Colloid and Interface Science
Lehui Lu, Weihua Chen, Jianhua Liu, Ying Wang, Chunhuan Jiang, Bin Yu, Zhen Sun
Intracellular targeting has the same potential as tissue targeting to increase therapy efficacy, especially for the DNA toxic drugs. Here, for the first time, adjusting the intracellular traffic, we developed a novel C5N2 nanoparticles (NPs)-based direct nucleus delivery platform. Supramolecular interactions of C5N2 NPs with the cell membrane enhanced the cell uptake; abundant edge amino groups promoted fast and effective rupture of early endosomes; and the suitable size was also crucial for size-dependent nuclear entry...
March 5, 2019: Angewandte Chemie
Haiyan Song, Hui Zhao, Xianfa Zhang, Yingming Xu, Xiaoli Cheng, Shan Gao, Lihua Huo
A hollow urchin-like α-MnO2 material has been synthesized by a hydrothermal method starting from MnSO4 ·H2 O and (NH4 )2 S2 O8 , and by using silver(I) as the catalyst. It has a hollow morphology with diameters of 5-6 μm and consists of densely aligned nanowires, with a 30-40 nm width and a 1.5 μm length. The diameter of the cavities and the thickness of the shell are about 1.2 μm and 300 nm, respectively. The material was placed on a glassy carbon electrode (GCE), and electrochemical experiments showed the respective sensor to possess good stability and reproducibility...
March 2, 2019: Mikrochimica Acta
Xingyan Zhang, Qiangang Fu, Heming Huang, Lu Wei, Xin Guo
Free-standing paper-like thin-film electrodes have great potential to boost next-generation power sources with highly flexible, ultrathin, and lightweight requirements. In this work, silver-quantum-dot- (2-5 nm) modified transition metal oxide (including MoO3 and MnO2 ) paper-like electrodes are developed for energy storage applications. Benefitting from the ohmic contact at the interfaces between silver quantum dots and MoO3 nanobelts (or MnO2 nanowires) and the binder-free nature and 0D/1D/2D nanostructured 3D network of the fabricated electrodes, substantial improvements on the electrical conductivity, efficient ionic diffusion, and areal capacitances of the hybrid nanostructure electrodes are observed...
March 1, 2019: Small
Ming-Hao Hsu, Ting-Hao Kuo, Webber Wei-Po Lai, Ching-Hua Huang, Cheng-Chih Hsu, Yung-En Chen, Angela Yu-Chen Lin
This study aimed to explore the oxidation and transformation of the cephalosporins cefotaxime (CTX), cephalexin (CFX), cephradine (CFD), cephapirin (CFP) and cefazolin (CFZ) by δ-MnO2. The results showed that the MnO2 oxidation rate was promoted by environmental factors such as higher MnO2 loading, lower initial cephalosporin concentration and lower solution pH. The inhibitory effect occurred in the presence of dissolved organic matter and dissolved cations (inhibitory capacity: Mn2+ > Ca2+ > Mg2+ > Fe3+)...
March 1, 2019: Environmental Science. Processes & Impacts
Xiang Luo, Xianheng Song, Wenfang Xiong, Jianheng Li, Mingkang Li, Zefeng Zhu, Shuxian Wei, Albert S C Chan, Yong Zou
A copper-catalyzed, 8-aminoquinoline-assisted, one-pot three-component coupling of aryl carboxamides, CO2 , and amines has been developed. This protocol proceeds smoothly in the presence of inexpensive CuI and MnO2 at room temperature under atmospheric CO2 pressure, leading to simultaneous construction of C-O and C-N bonds. The reaction displays a broad substrate scope, high functional group tolerance, and excellent monoselectivity, providing an operationally simple method for the synthesis of various O-aryl carbamates...
February 28, 2019: Organic Letters
Shuibin Tu, Xinxin Zhao, Mingren Cheng, Pengfei Sun, Yongwu He, Yunhua Xu
The actual implementation of lithium-sulfur batteries is hindered by the inferior cyclic stability and poor coulombic efficiency, stemming from the notorious shuttling of soluble polysulfide intermediates. Herein, uniform mesoporous MnO2 nanospheres were prepared using a facile self-assembly and room-temperature reaction method. As a sulfur carrier of sulfur cathodes, the versatile architecture of MnO2 not only provides a powerful chemical adsorption to anchor polysulfide intermediates on the large polar surface area but also restrains them within the nanopores by physical confinement...
February 26, 2019: ACS Applied Materials & Interfaces
Jiakang Min, Shuai Zhang, Jiaxin Li, Rüdiger Klingeler, Xin Wen, Xuecheng Chen, Xi Zhao, Tao Tang, Ewa Mijowska
Due to white pollution related environmental concern and sustainable development requirement, it is desirable to recycle the widely used plastic wastes into products with commercial value, such as high-valued carbon materials which can be applied in electrochemical fields. In this work, porous carbon flakes (PCFs) are produced by direct pyrolysis of polystyrene waste through template method. Furthermore, manganese dioxide (MnO2 ) nanosheets are selectively deposited on the surface of resultant PCFs to form hybrid (PCF-MnO2 )...
February 15, 2019: Waste Management
Weizhe Lu, Hanfeng Lu, Zekai Zhang
NH3 -SCR is an environmentally important reaction for the abatement of NO x from different resources. MnO2 -based catalyst has attracted significant attention due to the excellent activity. In this paper, a series of MnWO x /TiO2 -SiO2 catalysts were prepared by liquid-phase deposition method. The catalysts were characterized by N2 adsorption/desorption, XRD, TEM, XPS, FT-IR, H2 -TPR, TG and water adsorption capacity. The existence of SiO2 improved the SO2 and H2 O resistance of the MnWO x /TiO2 -SiO2 catalyst without decreasing the NH3 -SCR activity...
January 2019: Royal Society Open Science
Seoni Kim, Hwajoo Joo, Taegyun Moon, Seung-Hyun Kim, Jeyong Yoon
Due to the steep increase in the use of mobile electronics and electric vehicles, there has been a dramatic rise in the global lithium consumption. Although seawater is considered as an ideal future source of lithium, technological advances are necessary to ensure the economic feasibility of lithium recovery from seawater because the concentration and portion of Li+ are extremely low in seawater. Especially, battery-based electrochemical systems for lithium recovery have been considered as promising lithium recovery methods, though they have not been considered for seawater applications due to the extremely low concentration of Li+...
February 25, 2019: Environmental Science. Processes & Impacts
Xiang Ran, Fang Pu, Zhenzhen Wang, Jinsong Ren, Xiaogang Qu
Accurate and facile differentiation of cell types is essential for accurate diagnosis and therapy of diseases. However, it remains challenging due to low specificity, requirement of sophisticated instruments, and tedious operation steps. Herein, a simple, washing- and label-free chemical tongue was constructed for differentiation of cell types. In the array-based sensing platform, DNA-ligand ensembles adsorbed on the surface of MnO2 nanosheets were used as sensing probes. Instead of aptamers from cell-SELEX, the randomly designed DNA strands were used, offering versatile interactions with cells...
May 16, 2019: Analytica Chimica Acta
Jye Yng Teo, Yongbeom Seo, Eunkyung Ko, Jiayu Leong, Yu-Tong Hong, Yi Yan Yang, Hyunjoon Kong
Mesenchymal stem cells are the new generation of medicine for treating numerous vascular diseases and tissue defects because of their ability to secrete therapeutic factors. Poor cellular survival in an oxidative diseased tissue, however, hinders the therapeutic efficacy. To this end, we hypothesized that tethering the surface of stem cells with colloidal particles capable of discharging antioxidant cargos in response to elevated levels of hydrogen peroxide (H2 O2 ) would maintain survival and therapeutic activity of the stem cells...
February 13, 2019: Biomaterials
Jie Zhang, Jihong Hu, Datong Wu, Jianfeng Ma, Yongxin Tao, Yong Qin, Yong Kong
Sodium alginate (SA) was electrodeposited onto the surface of a glassy carbon electrode (GCE), and then l-lysine (l-Lys), l-alanine (l-Ala) and l-cysteine (l-Cys) were simultaneously introduced to the surface of SA via electrostatic attractions. γ-MnO2 film was deposited potentiostatically onto the multi-templates immobilized SA from an aqueous mixture of K2 SO4 and MnSO4 . The templates of l-Lys, l-Ala and l-Cys were then oxidized and removed by cyclic voltammetry (CV) while maintaining the crystalline structures of SA and MnO2 ...
February 16, 2019: International Journal of Biological Macromolecules
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