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https://www.readbyqxmd.com/read/28231538/biochars-with-excellent-pb-ii-adsorption-property-produced-from-fresh-and-dehydrated-banana-peels-via-hydrothermal-carbonization
#1
Nan Zhou, Honggang Chen, Junting Xi, Denghui Yao, Zhi Zhou, Yun Tian, Xiangyang Lu
Fresh and dehydrated banana peels were used as biomass feedstock to produce highly effective sorbent biochars through a facile one-step hydrothermal carbonization approach with 20%vol phosphoric acid as the reaction medium. The elemental ratio of oxygen content of the two as-prepared biochars were about 20%, and the FT-IR analysis confirmed the existence of abundant surface functional groups such as hydroxyl and carboxyl which greatly enhanced the adsorption performance. The sorbents showed excellent lead clarification capability of 359mg·g(-1) and 193mg·g(-1) for dehydrated and fresh banana peels based biochars, respectively...
February 12, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28230813/characterization-of-carbonic-anhydrase-9-in-the-alimentary-canal-of-aedes-aegypti-and-its-relationship-to-homologous-mosquito-carbonic-anhydrases
#2
Daniel P Dixon, Leslie Van Ekeris, Paul J Linser
In the mosquito midgut, luminal pH regulation and cellular ion transport processes are important for the digestion of food and maintenance of cellular homeostasis. pH regulation in the mosquito gut is affected by the vectorial movement of the principal ions including bicarbonate/carbonate and protons. As in all metazoans, mosquitoes employ the product of aerobic metabolism carbon dioxide in its bicarbonate/carbonate form as one of the major buffers of cellular and extracellular pH. The conversion of metabolic carbon dioxide to bicarbonate/carbonate is accomplished by a family of enzymes encoded by the carbonic anhydrase gene family...
February 21, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28230350/cyclic-voltammetry-probe-approach-curves-with-alkali-amalgams-at-mercury-sphere-cap-scanning-electrochemical-microscopy-probes
#3
Zachary J Barton, Joaquín Rodríguez-López
We report a method of precisely positioning a Hg-based ultramicroelectrode (UME) for scanning electrochemical microscopy (SECM) investigations of any substrate. Hg-based probes are capable of performing amalgamation reactions with metal cations, which avoid unwanted side reactions and positive feedback mechanisms that can prove problematic for traditional probe positioning methods. However, prolonged collection of ions eventually leads to saturation of the amalgam accompanied by irreversible loss of Hg. In order to obtain negative feedback positioning control without risking damage to the SECM probe, we implement cyclic voltammetry probe approach surfaces (CV-PASs), consisting of CVs performed between incremental motor movements...
February 23, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28230105/interface-confined-hydrogen-evolution-reaction-in-zero-valent-metal-nanoparticles-intercalated-molybdenum-disulfide
#4
Zhongxin Chen, Kai Leng, Xiaoxu Zhao, Souradip Malkhandi, Wei Tang, Bingbing Tian, Lei Dong, Lirong Zheng, Ming Lin, Boon Siang Yeo, Kian Ping Loh
Interface confined reactions, which can modulate the bonding of reactants with catalytic centres and influence the rate of the mass transport from bulk solution, have emerged as a viable strategy for achieving highly stable and selective catalysis. Here we demonstrate that 1T'-enriched lithiated molybdenum disulfide is a highly powerful reducing agent, which can be exploited for the in-situ reduction of metal ions within the inner planes of lithiated molybdenum disulfide to form a zero valent metal-intercalated molybdenum disulfide...
February 23, 2017: Nature Communications
https://www.readbyqxmd.com/read/28229537/high-temperature-stable-perovskite-solar-cell-based-on-low-cost-carbon-nanotube-hole-contact
#5
Kerttu Aitola, Konrad Domanski, Juan-Pablo Correa-Baena, Kári Sveinbjörnsson, Michael Saliba, Antonio Abate, Michael Grätzel, Esko Kauppinen, Erik M J Johansson, Wolfgang Tress, Anders Hagfeldt, Gerrit Boschloo
Mixed ion perovskite solar cells (PSC) are manufactured with a metal-free hole contact based on press-transferred single-walled carbon nanotube (SWCNT) film infiltrated with 2,2,7,-7-tetrakis(N,N-di-p-methoxyphenylamine)-9,90-spirobifluorene (Spiro-OMeTAD). By means of maximum power point tracking, their stabilities are compared with those of standard PSCs employing spin-coated Spiro-OMeTAD and a thermally evaporated Au back contact, under full 1 sun illumination, at 60 °C, and in a N2 atmosphere. During the 140 h experiment, the solar cells with the Au electrode experience a dramatic, irreversible efficiency loss, rendering them effectively nonoperational, whereas the SWCNT-contacted devices show only a small linear efficiency loss with an extrapolated lifetime of 580 h...
February 23, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28228169/characterization-of-sulfur-and-nanostructured-sulfur-battery-cathodes-in-electron-microscopy-without-sublimation-artifacts
#6
Barnaby D A Levin, Michael J Zachman, Jörg G Werner, Ritu Sahore, Kayla X Nguyen, Yimo Han, Baoquan Xie, Lin Ma, Lynden A Archer, Emmanuel P Giannelis, Ulrich Wiesner, Lena F Kourkoutis, David A Muller
Lithium sulfur (Li-S) batteries have the potential to provide higher energy storage density at lower cost than conventional lithium ion batteries. A key challenge for Li-S batteries is the loss of sulfur to the electrolyte during cycling. This loss can be mitigated by sequestering the sulfur in nanostructured carbon-sulfur composites. The nanoscale characterization of the sulfur distribution within these complex nanostructured electrodes is normally performed by electron microscopy, but sulfur sublimates and redistributes in the high-vacuum conditions of conventional electron microscopes...
February 2017: Microscopy and Microanalysis
https://www.readbyqxmd.com/read/28228035/a-molecular-dynamics-investigation-of-the-influence-of-water-structure-on-ion-conduction-through-a-carbon-nanotube
#7
L Liu, G N Patey
Molecular dynamics simulations are employed to investigate pressure-driven water and ion transport through a (9,9) carbon nanotube (CNT). We consider NaCl solutions modeled with both the TIP3P and TIP4P/2005 water models. Concentrations range from 0.25 to 2.8 mol l(-1) and temperatures from 260 to 320 K are considered. We discuss the influences on flow rates of continuum hydrodynamic considerations and molecular structural effects. We show that the flow rate of water, sodium, and chloride ions through the CNT is strongly model dependent, consistent with earlier simulations of pure water conduction...
February 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28225587/compms2miner-an-automatable-metabolite-identification-visualization-and-data-sharing-r-package-for-high-resolution-lc-ms-datasets
#8
William Matthew Bell Edmands, Lauren M Petrick, Dinesh Kumar Barupal, Augustin Scalbert, Mark Wilson, Jeffrey Wickliffe, Stephen M Rappaport
A long-standing challenge of untargeted metabolomic profiling by ultrahigh performance liquid chromatography-high resolution mass spectrometry (UHPLC-HRMS) is efficient transition from unknown mass spectral features to confident metabolite annotations. The compMS2Miner (Comprehensive MS2 Miner) package was developed in the R language to facilitate rapid, comprehensive feature annotation using a peak-picker-output and MS2 data files as inputs. The number of MS2 spectra that can be collected during a metabolomic profiling experiment far outweigh the amount of time required for pain-staking manual interpretation, therefore a degree of software workflow autonomy is required for broad-scale metabolite annotation...
February 22, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28225115/solvothermal-assisted-synthesis-of-self-assembling-tio2-nanorods-on-large-graphitic-carbon-nitride-sheets-with-their-anti-recombination-in-the-photocatalytic-removal-of-cr-vi-and-rhodamine-b-under-visible-light-irradiation
#9
Dingze Lu, Pengfei Fang, Wenhui Wu, Junqian Ding, Lulu Jiang, Xiaona Zhao, Chunhe Li, Minchen Yang, Yuanzhi Li, Dahai Wang
TiO2-based nanorods (TNRs) were self-assembled on large graphitic carbon nitride (g-C3N4) sheets via the solvothermal-assisted route. The results demonstrated that the effective anchoring of TNRs (a side length of ca. 200-300 nm) was highly dispersed on the surface of whole g-C3N4 sheets. The shift in the Ti 2p XPS core level spectrum indicated an increase in the net positive charge of the Ti ions, ensuring the formation of an interface between TNRs and g-C3N4. The charge transferred from g-C3N4 sheets to TNRs effectively prevented the recombination of excited charges, which is consistent with the significant quenching of PL...
February 22, 2017: Nanoscale
https://www.readbyqxmd.com/read/28224685/bubble-sheet-like-interface-design-with-an-ultrastable-solid-electrolyte-layer-for-high-performance-dual-ion-batteries
#10
Panpan Qin, Meng Wang, Na Li, Haili Zhu, Xuan Ding, Yongbing Tang
In this work, a bubble-sheet-like hollow interface design on Al foil anode to improve the cycling stability and rate performance of aluminum anode based dual-ion battery is reported, in which, a carbon-coated hollow aluminum anode is used as both anode materials and current collector. This anode structure can guide the alloying position inside the hollow nanospheres, and also confine the alloy sizes within the hollow nanospheres, resulting in significantly restricted volumetric expansion and ultrastable solid electrolyte interface (SEI)...
February 22, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28224683/confined-amorphous-red-phosphorus-in-mof-derived-n-doped-microporous-carbon-as-a-superior-anode-for-sodium-ion-battery
#11
Weihan Li, Shuhe Hu, Xiangyu Luo, Zhongling Li, Xizhen Sun, Minsi Li, Fanfan Liu, Yan Yu
Red phosphorus (P) has attracted intense attention as promising anode material for high-energy density sodium-ion batteries (NIBs), owing to its high sodium storage theoretical capacity (2595 mAh g(-1) ). Nevertheless, natural insulating property and large volume variation of red P during cycling result in extremely low electrochemical activity, leading to poor electrochemical performance. Herein, the authors demonstrate a rational strategy to improve sodium storage performance of red P by confining nanosized amorphous red P into zeolitic imidazolate framework-8 (ZIF-8) -derived nitrogen-doped microporous carbon matrix (denoted as P@N-MPC)...
February 22, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28221774/surface-electronic-state-modulated-single-crystalline-001-tio2-nanosheets-for-sensitive-electrochemical-sensing-of-heavy-metal-ions
#12
Wen-Yi Zhou, Jinyun Liu, Jieyao Song, Jinjin Li, Jinhuai Liu, Xing-Jiu Huang
Intrinsically low conductivity and poor reactivity restrict many semiconductors from electrochemical detection. Usually, metal- and carbon-based modifications of semiconductors are necessary, making them complex, expensive, and unstable. Here, for the first time, we present a surface-electronic-state-modulation-based concept applied to semiconductors. This concept enables pure semiconductors to be directly available for ultrasensitive electrochemical detection of heavy-metal ions without any modifications. As an example, a defective single-crystalline (001) TiO2 nanosheet exhibits high electrochemical performance toward Hg(II), including a sensitivity of 270...
February 21, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28221711/ion-conductive-properties-of-a-polymer-electrolyte-based-on-ethylene-carbonate-ethylene-oxide-random-copolymer
#13
Takashi Morioka, Koji Nakano, Yoichi Tominaga
A random copolymer of ethylene oxide with CO2 , namely, poly(ethylene carbonate/ethylene oxide) (P(EC/EO)), has been synthesized as a novel candidate for polymer electrolytes. Electrolyte composed of P(EC/EO) and lithium bis(fluorosulfonyl)imide has an ionic conductivity of 0.48 mS cm(-1) and a Li transference number (t + ) of 0.66 at 60 °C. To study ion-conductive behavior of P(EC/EO)-based electrolytes, the Fourier transform infrared (FT-IR) technique is used to analyze the interactions between Li(+) and functional groups of the copolymer...
February 21, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28221098/ion-transport-by-ameloblasts-during-amelogenesis
#14
A L J J Bronckers
Hypomineralization of developing enamel is associated with changes in ameloblast modulation during the maturation stage. Modulation (or pH cycling) involves the cyclic transformation of ruffle-ended (RE) ameloblasts facing slightly acidic enamel into smooth-ended (SE) ameloblasts near pH-neutral enamel. The mechanism of ameloblast modulation is not clear. Failure of ameloblasts of Cftr-null and anion exchanger 2 ( Ae2)-null mice to transport Cl(-) into enamel acidifies enamel, prevents modulation, and reduces mineralization...
March 2017: Journal of Dental Research
https://www.readbyqxmd.com/read/28221016/preparation-and-rate-capability-of-carbon-coated-lini1-3co1-3mn1-3o2-as-cathode-material-in-lithium-ion-batteries
#15
Chaofan Yang, Xiaosong Zhang, Mengyi Huang, Junjie Huang, Zebo Fang
LiNi1/3Co1/3Mn1/3O2 (NCM) is regarded as a promising material for next-generation lithium ion batteries due to the high capacity, but its practical applications are limited by the poor electronic conductivity. Here, a one-step method is used to prepare carbon coated LiNi1/3Co1/3Mn1/3O2 (NCM/C) by applying active carbon as reaction matrix. TEM shows LiNi1/3Co1/3Mn1/3O2 particles are homogeneously coated by carbon with a thickness about 10 nm. NCM/C delivers the discharge capacity of 191.2 mAh g-1 at 0.5 C (85 mA g-1) with a columbic efficiency of 91...
February 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28220961/carbon-based-perovskite-solar-cells-without-hole-transport-materials-the-front-runner-to-the-market
#16
REVIEW
Haining Chen, Shihe Yang
Organometal trihalide perovskite solar cells (PSCs) have garnered recent interest in the scientific community. In the past few years, they have achieved power conversion efficiencies comparable to traditional commercial solar cells (e.g., crystalline Si, CuInGaSe and CdTe) due to their low-cost of production via solution-processed fabrication techniques. However, the stability of PSCs must be addressed before their commercialization is viable. Among various kinds of PSCs, carbon-based PSCs without hole transport materials (C-PSCs) seem to be the most promising for addressing the stability issue because carbon materials are stable, inert to ion migration (which originates from perovskite and metal electrodes), and inherently water-resistant...
February 21, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28220676/cho-cells-adapted-to-inorganic-phosphate-limitation-show-higher-growth-and-higher-pyruvate-carboxylase-flux-in-phosphate-replete-conditions
#17
Vishwanathgouda Maralingannavar, Dharmeshkumar Parmar, Tejal Pant, Chetan Gadgil, Venkateswarlu Panchagnula, Mugdha Gadgil
Inorganic phosphate (Pi ) is an essential ion involved in diverse cellular processes including metabolism. Changes in cellular metabolism upon long term adaptation to Pi limitation have been reported in E. coli. Given the essential role of Pi , adaptation to Pi limitation may also result in metabolic changes in animal cells. In this study, we have adapted CHO cells producing recombinant IgG to limiting Pi conditions for 75 days. Not surprisingly, adapted cells showed better survival under Pi limitation. Here, we report the finding that such cells also showed better growth characteristics compared to control in batch culture replete with Pi (higher peak density and integral viable cell density), accompanied by a lower specific oxygen uptake rate and cytochrome oxidase activity towards the end of exponential phase...
February 21, 2017: Biotechnology Progress
https://www.readbyqxmd.com/read/28220590/biosynthesis-and-mass-spectral-fragmentation-pathways-of-13-c-and-15-n-labeled-cytochalasin-d-produced-by-xylaria-arbuscula
#18
Luciana da Silva Amaral, Taicia Pacheco Fill, Luiz Fernando Arruda Santos, Edson Rodrigues-Filho
The fungus Xylaria arbuscula was isolated as an endophyte from Cupressus lusitanica and has shown to be a prominent producer of cytochalasans, mainly cytochalasin C, D and Q. Cytochalasans comprise an important class of fungal secondary metabolites that have aroused attention due to their uncommon molecular structures and pronounced biological activities. Due to the few published studies on the ESI-MS/MS fragmentation of this important class of secondary metabolites, in the first part of our work we studied the cytochalasin D fragmentation pathways using an ESI-Q-ToF mass spectrometer coupled with liquid chromatography...
February 21, 2017: Journal of Mass Spectrometry: JMS
https://www.readbyqxmd.com/read/28220172/mechanistic-insights-into-biomimetic-carbonic-anhydrase-action-catalyzed-by-doped-carbon-nanotubes-and-graphene
#19
Manju Verma, Parag A Deshpande
Electronic structural analyses of hydrogen terminated metal doped carbon nanotube/graphene (M-CNT/Gr, MN3-CNT/Gr, M = Ru/Rh) and ruthenium cluster decorated carbon nanotube/graphene (Ru4-CNT/Gr) were carried out for examining the biomimetic catalytic activity towards CO2 hydration reaction. The carbonic anhydrase action was followed for the reaction of CO2 with H2O resulting in a bicarbonate ion and a proton. All the catalysts were found to be active for CO2 hydration and the mechanism proved them to be biomimetic...
February 21, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28220165/new-insights-into-the-electroreduction-of-ethylene-sulfite-as-an-electrolyte-additive-for-facilitating-solid-electrolyte-interphase-formation-in-lithium-ion-batteries
#20
Youmin Sun, Yixuan Wang
To help understand the solid electrolyte interphase (SEI) formation facilitated by electrolyte additives of lithium-ion batteries (LIBs) the supermolecular clusters [(ES)Li(+)(PC)m](PC)n (m = 1-2; n = 0, 6 and 9) were used to investigate the electroreductive decompositions of the electrolyte additive ethylene sulfite (ES) as well as the solvent propylene carbonate (PC) with density functional theory. The results show that ES can be reduced prior to PC, resulting in a reduction precursor that will then undergo a ring opening decomposition to yield a radical anion...
February 21, 2017: Physical Chemistry Chemical Physics: PCCP
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