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Kuppusamy Sathishkumar, Sivaji Sathiyaraj, Punniyakotti Parthipan, Agrawal Akhil, Kadarkarai Murugan, Aruliah Rajasekar
Textile effluent consists of enormous quantities of toxic dyes, which are being discharged into natural aqueous system and thus contaminate the water quality. Hence it is important to develop an eco-friendly and cost effective technology to treat the dyes contaminated wastewater. In this research, an integrated approach of electrochemical oxidation (EO) and biodegradation process (BP) was studied of methyl red (MR) dye. In EO, RuO2-IrO2-TiO2 is used as anode and titanium mesh electrode as cathode. This was followed by BP of the treated EO effluent...
May 15, 2017: Chemosphere
Raghav Garg, Sahil Kumar Rastogi, Michael Lamparski, Sergio de la Barrera, Gordon T Pace, Noel T Nuhfer, Benjamin Matthew Hunt, Vincent Meunier, Tzahi Cohen-Karni
Graphene, a honeycomb sp(2) hybridized carbon lattice, is a promising building block for hybrid-nanomaterials due to its electrical, mechanical, and optical properties. Graphene can be readily obtained through mechanical exfoliation, solution-based deposition of reduced graphene oxide (rGO), and chemical vapor deposition (CVD). The resulting graphene films' topology is two-dimensional (2D) surface. Recently a three-dimensional (3D) graphene topology has been demonstrated by various approaches. However, the resulting graphene films are lying flat on the surface hence still exposing a 2D surface topology...
May 26, 2017: ACS Nano
I Antal, M Koneracka, V Zavisova, M Kubovcikova, Zh Kormosh, P Kopcansky
The use of electroanalytical techniques for the determination of statins (Atorvastatin, Fluvastatin, Lovastatin, Pitavastatin, Pravastatin, Rosuvastatin and Simvastatin) is reviewed covering the period from 1997 to 2016. Among all of the published electrochemical methods, voltammetry and polarography are the most popular techniques for determination of statins and both are used for the analysis of pharmaceutical dosage forms and biological samples. Determination of statins by potentiometric method using ion-selective electrodes is reported in only few papers...
May 26, 2017: Critical Reviews in Analytical Chemistry
Juan Wang, Han Zhu, Danni Yu, JiaWei Chen, JiaDong Chen, Ming Zhang, LiNa Wang, MingLiang Du
The bimetallic Au-Cu alloy nanoparticles have been constructed in electrospun carbon nanofibers (Au-Cu/CNFs), employing as high efficient hydrogen evolution reaction (HER) electrode. The morphology, structure and composition of bimetallic Au-Cu alloy can be controlled by adjusting the precursor nanofibers through a facile approach. With the increased Cu contents, the Au-Cu alloy have a transition from homogenous AuCu3 alloy phase to Au3Cu phase with Cu shell. The self-supported bimetallic Au-Cu/CNFs hybrid can be directly employed as electrodes materials for water splitting and it showed excellent electrochemical activity, including long-term stability, high exchange current density and low overpotential...
May 26, 2017: ACS Applied Materials & Interfaces
Hao Li, Fang Wang, Shenguang Ge, Haiyun Liu, Mei Yan, Jinghua Yu
In this work, a new method of protein detection in complicated samples is proposed. This method employs probe-target recognition to induce cross-linking among the probe, the target, and the nonspecific proteins in the complicated sample as a means to convert interference into effective signal amplification. This also eliminates the necessity of multistep signal amplification in a separate solution system. On the basis of this strategy, a simple and robust assay for the activity of serum cathepsin B is established...
May 26, 2017: Analytical Chemistry
Hongfen Zhang, Baiyan Zhang, Anjia Chen, Yong Qin
An elegant atomic layer deposition (ALD) method has been employed for the controllable preparation of a uniform Fe2O3-coated graphene nanostructure (Fe2O3@graphene). The Fe2O3 coating thickness of the Fe2O3@graphene nanostructure can be tuned by varying the cycle number of Fe2O3 ALD. The produced Fe2O3@graphene composites are characterized by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy and cyclic voltammetry (CV). It is revealed that Fe2O3 is effectively deposited on the surface of graphene...
May 26, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Harsharaj S Jadhav, Gaurav M Thorat, Bharat B Kale, Jeong Gil Seo
Transition metal oxides are the most promising candidates in low-cost and eco-friendly energy storage/conversion applications. Herein, bare Mn2O3 and a Mn2O3/reduced graphene oxide (rGO) composite have been synthesized by a facile chemical co-precipitation and subsequent annealing procedure. The synthesized Mn2O3/rGO composite exhibits a porous microcube structure formed with several interconnected particles. The porous Mn2O3/rGO composite, with high surface area and increased conductivity, facilited the charge transfer to enhance the overall electrochemical performance when applied as an anode material in Li-ion batteries...
May 26, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Xuelong Wang, Ruijuan Xiao, Hong Li, Liquan Chen
Through first-principles calculations and crystal structure prediction techniques, we identify a new layered oxysulfide LiAlSO in orthorhombic structure as a novel lithium superionic conductor. Two kinds of stacking sequences of layers of AlS_{2}O_{2} are found in different temperature ranges. Phonon and molecular dynamics simulations verify their dynamic stabilities, and wide band gaps up to 5.6 eV are found by electronic structure calculations. The lithium migration energy barrier simulations reveal the collective interstitial-host ion "kick-off" hopping mode with barriers lower than 50 meV as the dominating conduction mechanism for LiAlSO, indicating it to be a promising solid-state electrolyte in lithium secondary batteries with fast ionic conductivity and a wide electrochemical window...
May 12, 2017: Physical Review Letters
Jinping Wang, May Ching Leong, Eric Zhewei Leong, Win Sen Kuan, David T Leong
Streptococcus pneumoniae (SP) is a pathogenic bacterium and a major cause of community-acquired pneumonia that could be fatal if left untreated. Therefore, rapid and sensitive detection of SP is crucial to enable targeted treatment during SP infections. In this study, DNA tetrahedron (DNA TH) with a hollow structure is anchored on gold electrodes to construct an electrochemical immunosensor for rapid detection of pneumococcal surface protein A (PspA) peptide and SP lysate from synthetic and actual human samples...
May 26, 2017: Analytical Chemistry
Xiaoqiang Du, Jingwei Huang, Yong Ding
Developing noble metal-free water oxidation catalysts is essential for many energy conversion/storage processes (e.g., water splitting). Herein, we report a facile synthesis of CuO microspheres composed of ultrathin, single-crystal-like nanosheets via a simple solution method. The as-obtained CuO microspheres can serve as an active and stable water oxidation catalyst under electrochemical reaction conditions, owing to their unique structural features. In electrochemical water oxidation, this catalyst affords a current density of 10 mA cm(-2) (a value related to practical relevance) at an overpotential of ∼0...
May 26, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Mateusz Odziomek, Frédéric Chaput, Anna Rutkowska, Konrad Świerczek, Danuta Olszewska, Maciej Sitarz, Frédéric Lerouge, Stephane Parola
High-performance Li-ion batteries require materials with well-designed and controlled structures on nanometre and micrometre scales. Electrochemical properties can be enhanced by reducing crystallite size and by manipulating structure and morphology. Here we show a method for preparing hierarchically structured Li4Ti5O12 yielding nano- and microstructure well-suited for use in lithium-ion batteries. Scalable glycothermal synthesis yields well-crystallized primary 4-8 nm nanoparticles, assembled into porous secondary particles...
May 26, 2017: Nature Communications
Ali Kachmar, Marcelo Carignano, Teodoro Laino, Marcella Iannuzzi, Jürg Hutter
The understanding of lithium solvation and transport in ionic liquids is important due to the possible applications in electrochemical devices. Using first principles simulations aided with the metadynamics approach we study the free energy landscape for lithium at infinite dilution conditions in ethylammonium nitrate, a protic ionic liquid. We analyze the local structure of the liquid around the lithium cation and find a quantitative picture in agreement with experimental findings. Our simulations show that the lowest two free energy minima correspond to conformations with the lithium solvated either by 3 or 4 nitrates ions with a transition barrier between them of 0...
May 26, 2017: ChemSusChem
Jianbin Zhou, Xianyu Liu, Wenlong Cai, Yongchun Zhu, Jianwen Liang, Kailong Zhang, Yang Lan, Zhuoheng Jiang, Gongming Wang, Yitai Qian
Large-volume-expansion-induced material pulverization severely limits the electrochemical performance of red phosphorous (P) for energy-storage applications. Hollow nanospheres with porous shells are recognized as an ideal structure to resolve these issues. However, a chemical synthetic approach for preparing nanostructured red P is always of great challenge and hollow nanosphere structures of red P have not yet been fabricated. Herein, a wet solvothermal method to successfully fabricate hollow P nanospheres (HPNs) with porous shells via a gas-bubble-directed formation mechanism is developed...
May 26, 2017: Advanced Materials
Su Ryon Shin, Tugba Kilic, Yu Shrike Zhang, Huseyin Avci, Ning Hu, Duckjin Kim, Cristina Branco, Julio Aleman, Solange Massa, Antonia Silvestri, Jian Kang, Anna Desalvo, Mohammed Abdullah Hussaini, Su-Kyoung Chae, Alessandro Polini, Nupura Bhise, Mohammad Asif Hussain, HeaYeon Lee, Mehmet R Dokmeci, Ali Khademhosseini
Development of an efficient sensing platform capable of continual monitoring of biomarkers is needed to assess the functionality of the in vitro organoids and to evaluate their biological responses toward pharmaceutical compounds or chemical species over extended periods of time. Here, a novel label-free microfluidic electrochemical (EC) biosensor with a unique built-in on-chip regeneration capability for continual measurement of cell-secreted soluble biomarkers from an organoid culture in a fully automated manner without attenuating the sensor sensitivity is reported...
May 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
Yongjin Fang, Jiexin Zhang, Lifen Xiao, Xinping Ai, Yuliang Cao, Hanxi Yang
Sodium ion batteries (SIBs) have been considered as a promising alternative for the next generation of electric storage systems due to their similar electrochemistry to Li-ion batteries and the low cost of sodium resources. Exploring appropriate electrode materials with decent electrochemical performance is the key issue for development of sodium ion batteries. Due to the high structural stability, facile reaction mechanism and rich structural diversity, phosphate framework materials have attracted increasing attention as promising electrode materials for sodium ion batteries...
May 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
Abdurazag T Swesi, Jahangir Masud, Wipula P R Liyanage, Siddesh Umapathi, Eric Bohannan, Julia Medvedeva, Manashi Nath
Herein we have shown that electrodeposited NiSe2 can be used as a bifunctional electrocatalyst under alkaline conditions to split water at very low potential by catalyzing both oxygen evolution and hydrogen evolution reactions at anode and cathode, respectively, achieving a very high electrolysis energy efficiency exceeding 80% at considerably high current densities (100 mA cm(-2)). The OER catalytic activity as well as electrolysis energy efficiency surpasses any previously reported OER electrocatalyst in alkaline medium and energy efficiency of an electrolyzer using state-of-the-art Pt and RuO2 as the HER and OER catalyst, respectively...
May 25, 2017: Scientific Reports
Habib Razmi, Elnaz Marzi Khosrowshahi, Samaneh Farrokhzadeh
In this study, a tiny coiled cupper wire as a novel solid phase microextraction (SPME) fiber was coated with mesoporous silica/cetyltrimethylammonium bromide (MCM-41/CTAB) as an adsorbent by electrochemically assisted self-assembly method and used for the preconcentration of polycyclic aromatic hydrocarbons (PAHs) as model analytes prior to chromatographic determination. Deposition of MCM-41/CTAB on the coiled SPME (C-SPME) fiber resulted in easily controlled and reproducible SPME coatings. Non-calcined MCM-41/CTAB on C-SPME plays a key role in the adsorption of PAHs...
April 9, 2017: Journal of Chromatography. A
Chun-Han Lai, David Ashby, Melissa K Moz, Yury Gogotsi, Laurent Pilon, Bruce S Dunn
Composite structures for electrochemical energy storage are prepared based on using the high rate lithium-ion insertion properties of Nb2O5. The Nb2O5 anchored on reduced graphene oxide (rGO) by hydrothermal synthesis to improve charge transfer properties and, by controlling surface charge, the resulting Nb2O5-rGO particles are attached to a high surface area carbide-derived carbon scaffold without blocking its exfoliated layers. The electrochemical results are analyzed using a recently published multi-scale physics model that provides significant insights regarding charge storage kinetics...
May 25, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
ChenDi Ding, JianHua Xu, Ling Tong, GuangCai Gong, Wei Jiang, JiaJun Fu
Corrosion potential stimulus-responsive smart nanocontainers (CP-SNCs), are designed and synthesized based on the installation of the supramolecular assemblies (bipyridinium ⊂ water-soluble pillar[5]arenes) onto the exterior surface of magnetic nanovehicles (Fe3O4@mSiO2), linked by disulfide linkers. The supramolecular assemblies with high binding affinity as gatekeepers effectively block the encapsulated organic corrosion inhibitor, 8-hydroxyquinoline (8-HQ), within the mesopores of Fe3O4@mSiO2. When the corrosion potential of magnesium alloy (-1...
May 26, 2017: ACS Applied Materials & Interfaces
Junlin Jiang, Benjamin D Sherman, Yan Zhao, Ru He, Ion Ghiviriga, Leila Alibabaei, Thomas J Meyer, Gyu Leem, Kirk S Schanze
A polystyrene-based chromophore-catalyst assembly (poly-2) has been synthesized and assembled at a mesoporous metal oxide photoanode. The assembly contains water oxidation catalyst centers based on [Ru(trpy)(phenq)(2+)] (Ru-Cat) and a [Ru(bpy)3](2+) derivative (Ru-C) as chromophores (trpy= 2,2';6,2″- terpyridine, phenq = 2-(quinol-8'-yl)-1,10-phenanthroline and bpy = 2,2'-bipyridine). The photophysical and electrochemical properties of the polychromophore-oxidation catalyst assembly were investigated in solution and at the surface of mesoporous metal oxide films...
May 26, 2017: ACS Applied Materials & Interfaces
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