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Edna M S Oliveira, Francisco R Silva, Crislânia C O Morais, Thiago Mielle B F Oliveira, Carlos A Martínez-Huitle, Artur J Motheo, Cynthia C Albuquerque, Suely S L Castro
This study investigated the anodic oxidation of phenolic wastewater generated by cashew-nut processing industry (CNPI) using active (Ti/RuO2 -TiO2 ) and inactive (boron doped diamond, BDD) anodes. During electrochemical treatment, various operating parameters were investigated, such as current density, chemical oxygen demand (COD), total phenols, O2 production, temperature, pH, as well as current efficiency and energy consumption. After electrolysis under optimized working conditions, samples were evaluated by chromatography and toxicological tests against L...
February 9, 2018: Chemosphere
Fengxia Deng, Hugo Olvera-Vargas, Orlando Garcia-Rodriguez, Shan Qiu, Jixian Yang, Olivier Lefebvre
A composite nickel-iron-foam (Ni-Fe-F) electrode was used as a cathode in the electro-Fenton (EF) process at circum-neutral pH in the presence of sodium tripolyphosphate (TPP) as supporting electrolyte. It was found that phenol degradation was dramatically improved by the synergistic effect of Ni-Fe-F and TPP, reaching 100% removal in 40 min, with kapp  = (8.90 ± 0.12) × 10-2 min-1 , which was about 18 times higher than that of Ni-Fe-F with sulfate as conventional electrolyte at pH 3.00 (kapp  = (5...
March 5, 2018: Chemosphere
A Abellán-Llobregat, C González-Gaitán, L Vidal, A Canals, E Morallón
A new portable electrochemical sensor based on 4-aminobenzoic acid-modified herringbone carbon nanotubes (hCNTs-4ABA/Au-IDA) has been developed for the simultaneous determination of ascorbic acid (AA) and uric acid (UA) in physiological fluids. AA and UA were quantified by chronoamperometry at 0.1 and 0.32 V, respectively, in phosphate buffer solution (PBS 0.25 M, pH 7.0). Significant results were obtained for the separate quantification of AA and UA, with a limit of detection (LOD) of 0.65 μM for both analytes, and sensitivities of (9...
February 23, 2018: Biosensors & Bioelectronics
Qiushi Li, Jihui Wang, Xuteng Xing, Wenbin Hu
The corrosion behavior of X65 steel was investigated in the seawater inoculated with sulfate reducing bacteria (SRB) under the aerobic environment by electrochemical impedance techniques and immersion tests. The corroded morphologies and the composition of the corrosion products were investigated. The variation of the solution parameters including the bacterium number, the pH value and the soluble iron concentration were also investigated. The results indicated that in the SRB-containing system, the impedance responses presented a depressed semi-circle in the initial period, which then turned into the blocked electrode characteristic during the later immersion...
March 11, 2018: Bioelectrochemistry
Jay K Bhattarai, Dharmendra Neupane, Bishal Nepal, Vasilii Mikhaylov, Alexei V Demchenko, Keith J Stine
Nanoporous gold (np-Au), because of its high surface area-to-volume ratio, excellent conductivity, chemical inertness, physical stability, biocompatibility, easily tunable pores, and plasmonic properties, has attracted much interested in the field of nanotechnology. It has promising applications in the fields of catalysis, bio/chemical sensing, drug delivery, biomolecules separation and purification, fuel cell development, surface-chemistry-driven actuation, and supercapacitor design. Many chemical and electrochemical procedures are known for the preparation of np-Au...
March 16, 2018: Nanomaterials
Francesca Malvano, Luigi Maritato, Giovanni Carapella, Pasquale Orgiani, Roberto Pilloton, Marisa Di Matteo, Donatella Albanese
Due to their interesting ferroelectric, conductive and dielectric properties, in recent years, perovskite-structured materials have begun to attract increasing interest in the biosensing field. In this study, a strontium titanate perovskite layer (SrTiO₃) has been synthesized on a platinum electrode and exploited for the development of an impedimetric label-free immunosensor for Escherichia coli O157:H7 detection. The electrochemical characterization of the perovskite-modified electrode during the construction of the immunosensor, as well as after the interaction with different E...
March 16, 2018: Biosensors
Takahiko Kojima, Fumiya Ogishima, Takahisa Nishibu, Hiroaki Kotani, Tomoya Ishizuka, Toshihiro Okajima, Shunsuke Nozawa, Yoshihito Shiota, Kazunari Yoshizawa, Hiroyoshi Ohtsu, Masaki Kawano, Takuya Shiga, Hiroki Oshio
An iron(III) complex having a dibenzotetraethyltetraamido macrocyclic ligand (DTTM4- ), (NEt4 )2 [FeIII (DTTM)Cl] (1), was synthesized and characterized by crystallographic, spectroscopic, and electrochemical methods. Complex 1 has a square-pyramidal structure in the S =3 /2 spin state. The complex exhibited two reversible redox waves at +0.36 and +0.68 V (vs SCE) in the cyclic voltammogram measured in CH2 Cl2 at room temperature. The stepwise oxidation of 1 using chemical oxidants allowed us to observe clear and distinct spectral changes with distinct isosbestic points for each step, in which oxidation occurred at the phenylenediamido moiety rather than the iron center...
March 16, 2018: Inorganic Chemistry
Xiulin Fan, Jie Yue, Fudong Han, Ji Chen, Tao Deng, Xiuquan Zhou, Singyuk Hou, Chunsheng Wang
Room temperature all solid-state Na-S batteries (ASNSBs) using sulfide solid electrolytes are a promising next-generation battery technology due to the high energy, enhanced safety, and earth abundant resources of both sodium and sulfur. Currently, the sulfide electrolyte ASNSBs are fabricated by simple cold-pressing process leaving with high residential stress. Even worse, the large volume change of S/Na2S during charge/discharge cycles induces additional stress, seriously weakening the less-contacted interfaces among the solid electrolyte, active materials and the electron conductive agent that are formed in the cold-pressing process...
March 16, 2018: ACS Nano
Srabanti Ghosh, Laurence Ramos, Hynd Remita
Materials are the key roadblocks for the commercialization of energy conversion devices in fuel cells and solar cells. Significant research has focused on tuning the intrinsic properties of materials at the nanometer scale. The soft template mediated controlled fabrication of advanced nanostructured materials is attracting considerable interest due to the promising applications of these materials in catalysis and electrocatalysis. Swollen hexagonal lyotropic liquid crystals (SLCs) consist of oil-swollen surfactant-stabilized 1D, 2D or 3D nanometric assemblies regularly arranged in an aqueous solvent...
March 16, 2018: Nanoscale
Lu-Lu Zhang, Ji-Qing Wang, Xue-Lin Yang, Gan Liang, Tao Li, Peng-Lin Yu, Di Ma
Layered LiNi1/3Co1/3Mn1/3O2 (NCM333) is successfully coated by fast ionic conductor LiTi2(PO4)3 (LTP) via wet chemical method. The effects of LTP on the physicochemical properties and electrochemical performance are studied. The results reveal that a highly layered structure of NCM333 can be well maintained with less cation mixing after LTP coating. LTP about 5 nm thickness is coated on the surface of NCM333. Such LTP coating layer can effectively suppress the side reactions between NCM333 and electrolyte but will not hinder the lithium ion transmission...
March 16, 2018: ACS Applied Materials & Interfaces
Ze Yang, Xiangyan Shen, Ning Wang, Jianjiang He, Xiaodong Li, Xin Wang, Zhufeng Hou, Kun Wang, Juan Gao, Tonggang Jiu, Changshui Huang
The qualitative and quantitative nitrogen-doping strategy for carbon materials is reported here. Novel porous nanocarbon networks pyrimidine-graphdiyne (PM-GDY) and pyridine-graphdiyne (PY-GDY) films with large areas were successfully prepared. These films are self-supported, uniform, continuous, flexible, transparent, and quantitively doped with merely pyridine-like nitrogen (N) atoms through the facile chemical synthesis route. Theoretical predictions imply these N doped carbonaceous materials are much favorable for storing lithium (Li)-ions since the pyridinic N can enhance the interrelated binding energy...
March 16, 2018: ACS Applied Materials & Interfaces
Kun Liu, Chunlan Song, Aiwen Lei
Electrochemical oxidative cross-coupling with hydrogen evolution has become an environmentally friendly and efficient way to form new bonds. Direct electrosynthesis by anodic oxidation has been developed for the synthesis of complex molecules. However, in some cases, redox catalysts were needed to avoid over-oxidation and to achieve better reaction selectivity. Recently, the use of iodine as a mediator to achieve indirect electrochemical reactions has drawn increasing attention. This review article gives an overview of the recent development of iodine mediated electrochemical oxidative coupling reactions...
March 16, 2018: Organic & Biomolecular Chemistry
Paween Mahinthichaichan, Robert B Gennis, Emad Tajkhorshid
Cytochrome aa3 is the terminal respiratory enzyme of all eukaryotes and many bacteria and archaea, reducing O2 to water and harnessing the free energy from the reaction to generate the transmembrane electrochemical potential. The diffusion of O2 to the heme-copper catalytic site, which is buried deep inside the enzyme, is the initiation step of the reaction chemistry. Our previous molecular dynamics (MD) study with cytochrome ba3 , a homologous enzyme of cytochrome aa3 in Thermus thermophilus, demonstrated that O2 diffuses from the lipid bilayer to its reduction site through a 25-Å long tunnel inferred by Xe-binding sites detected by X-ray crystallography$ ...
March 16, 2018: Biochemistry
Zhen-Yue Wu, Chao Ma, Yu-Lin Bai, Yu-Si Liu, Shi-Feng Wang, Xiao Wei, Kai-Xue Wang, Jie-Sheng Chen
The development of sustainable and low cost electrode materials for sodium-ion batteries has attracted considerable attention. In this work, a carbon composite material decorated with in situ generated ZnS nanoparticles has been prepared via a simple pyrolysis of the rubber powder from dumped tires. Upon being used as an anode material for sodium-ion batteries, the carbon composite shows a high reversible capacity and rate capability. A capacity as high as 267 mA h g-1 is still retained after 100 cycles at a current density of 50 mA g-1...
March 16, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Khairunnisa Amreen, Sivakumar Nisha, Annamalai Senthil Kumar
Direct sensing of uric acid (UA) in an undiluted whole blood sample is reported here taking human whole blood as an analyte and a self-supporting electrolyte. Among various solid electrodes (Pt, Au, GCE, and GCE/Nafion) and carbon nanomaterials (carbon nanofibers, graphene oxide, graphite nanopowder, graphitized mesoporous carbon (GMC), single-walled carbon nanotubes, and multiwalled carbon nanotubes) tested, a GMC-modified glassy carbon electrode, designated as GCE/GMC, showed a remarkable response towards direct electrochemical oxidation of blood uric acid at ∼0...
March 16, 2018: Analyst
Daniel Rettenwander, Reinhard Wagner, Andreas Reyer, Maximilian Bonta, Lei Cheng, Marca M Doeff, Andreas Limbeck, Martin Wilkening, Georg Amthauer
The interface stability versus Li represents a major challenge in the development of next-generation all-solid-state batteries (ASSB), which take advantage of the inherently safe ceramic electrolytes. Cubic Li7 La3 Zr2 O12 garnets represent the most promising electrolytes for this technology. The high interfacial impedance versus Li is, however, still a bottleneck toward future devices. Herein, we studied the electrochemical performance of Fe3+ -stabilized Li7 La3 Zr2 O12 (LLZO:Fe) versus Li metal and found a very high total conductivity of 1...
February 22, 2018: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
Kavita M Jeerage, Stephanie L Candelaria, Samuel M Stavis
Electrocatalytic core-shell nanoparticles, such as nickel/iron oxides for the oxygen evolution reaction (OER) in alkaline electrolytes, require rapid synthesis and measurement for practical use. To meet this challenge, we investigated a novel process of adding Ni(II) species to Fe nanoparticles immediately after synthesis, which we expected to yield Ni-rich shells around Fe-rich cores. Cyclic voltammetry showed that the overpotential decreased as the molar ratio of Ni to Fe in the synthesis vessel increased from 0...
March 15, 2018: Scientific Reports
Nan Zhang, Lei Zhang, Linyin Feng, Lei Yao
ETHNOPHARMACOLOGICAL RELEVANCE: Cananga odorata essential oil, known as ylang-ylang essential oil (YYO), was commonly used in the aromatherapy for relaxation and mood adjusting use. In our previous study, YYO played anxiolytic effects on the mice in several behavioral tests that based on the instinctive responses to novel environments. AIM OF THE STUDY: To investigate the effects and mechanisms of YYO reversing the anxiety induced by 5-HT2C receptor agonist 1-(3-chlorophenyl) piperazine (m-CPP)...
March 12, 2018: Journal of Ethnopharmacology
Kshiti Singh, Nimisha Jadon, Rajeev Jain
Titanium oxide nanoparticles and 1-butyl-2,3-dimethylimidazolium bis (trifluoromethanesulfonyl) imide modified glassy carbon electrode (TiO2 /IL/GCE) has been fabricated for electrochemical sensing of flunarizine (FRH). The electrochemical properties and morphology of the prepared nanocomposite were studied by electrochemical impedance spectroscopy (EIS) and transmission electron microscopy (TEM). The response of the electrochemical sensor was found to be proportional to the concentrations of FRH in the range from 0...
March 2, 2018: Colloids and Surfaces. B, Biointerfaces
Teng-Sing Wei, Bok Yeop Ahn, Julia Grotto, Jennifer A Lewis
The growing demand for rechargeable lithium-ion batteries (LIBs) with higher capacity in customized geometries underscores the need for new battery materials, architectures, and assembly strategies. Here, the design, fabrication, and electrochemical performance of fully 3D printed LIBs composed of thick semisolid electrodes that exhibit high areal capacity are reported. Specifically, semisolid cathode and anode inks, as well as UV curable packaging and separator inks for direct writing of LIBs in arbitrary geometries are created...
March 15, 2018: Advanced Materials
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