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Fábio Gozzi, Ignasi Sirés, Silvio César de Oliveira, Amílcar Machulek, Enric Brillas
This study describes the performance of electro-Fenton (EF) and photoelectro-Fenton (PEF) processes to degrade the herbicide tebuthiuron (TBH) in 0.050 M Na2 SO4 at pH = 3.0. Experiments were performed in an undivided cell equipped with a boron-doped diamond (BDD) or Pt anode and an air-diffusion cathode that produces H2 O2 . Physisorbed hydroxyl radicals (M(OH)) generated from water oxidation at the anode and/or free OH formed from Fenton's reaction acted as main oxidants. All processes became much more effective using a BDD anode because of the higher oxidation power of BDD(OH)...
February 12, 2018: Chemosphere
Tessema F Mekonnen, Ulrich Panne, Matthias Koch
Biotransformation processes of fluopyram (FLP), a new succinate dehydrogenase inhibitor (SDHI) fungicide, were investigated by electrochemistry (EC) coupled online to liquid chromatography (LC) and electrospray mass spectrometry (ESI-MS). Oxidative phase I metabolite production was achieved using an electrochemical flow-through cell equipped with a boron-doped diamond (BDD) electrode. Structural elucidation and prediction of oxidative metabolism pathways were assured by retention time, isotopic patterns, fragmentation, and accurate mass measurements using EC/LC/MS, LC-MS/MS, and/or high-resolution mass spectrometry (HRMS)...
February 17, 2018: Analytical and Bioanalytical Chemistry
Carmen M Dominguez, Nihal Oturan, Arturo Romero, Aurora Santos, Mehmet A Oturan
This study is focused on the effective removal of recalcitrant pollutants hexaclorocyclohexanes (HCHs, isomers α, β, γ, and δ) and chlorobenzenes (CBs) present in a real groundwater coming from a landfill of an old lindane factory. Groundwater is characterized by a total organic carbon (TOC) content of 9 mg L -1 , pH 0 = 7, conductivity = 3.7 mS cm -1 , high salt concentration (SO 4 2- , HCO 3 - , Cl - ), and ferrous iron in solution. The experiments were performed using a BDD anode and a carbon felt (CF) cathode at the natural groundwater pH and without addition of supporting electrolyte...
February 14, 2018: Environmental Science and Pollution Research International
Ruth A Ettinger, Joseph A Liberman, Devi Gunasekera, Komal Puranik, Eddie A James, Arthur R Thompson, Kathleen P Pratt
Factor VIII (FVIII)-neutralizing antibodies (inhibitors) are a serious complication in hemophilia A (HA). The peptide FVIII 2194-2213 contains an immunodominant HLA-DRA*01-DRB1*01:01 (DRB1*01:01)-restricted epitope recognized by CD4 + T-effector cells from HA subjects. The aim of this study was to identify amino acid substitutions to deimmunize this epitope while retaining procoagulant function and expression levels comparable to those of wild-type (WT) FVIII proteins. The shortest DRB1*01:01-binding peptide was FVIII 2194-2205 , and residues important for affinity were identified as F2196, M2199, A2201, and S2204...
February 27, 2018: Blood Advances
Paulo Vinicius F da Costa, Rejane Maria P da Silva, Hugo B Suffredini, Wendel A Alves
This work describes the electro polymerization of a poly-L-arginine film onto boron-doped diamond (BDD) electrode and glassy carbon electrode (GCE) surfaces. The morphological and electrochemical properties of the modified electrodes were studied by atomic force microscopy and electrochemical methods, and their potential for terbutaline sulfate (TBS) detection was determined by voltammetry and chronoamperometry techniques. Our results demonstrate that the electrochemical surface area of both uncoated-bare electrodes (GCE e BDD) did not have significant differences in performance...
July 1, 2018: Journal of Nanoscience and Nanotechnology
Jiahui Xian, Min Liu, Wei Chen, Chunyong Zhang, Degang Fu
The electrochemical incineration of diethylenetriaminepentaacetic acid (DTPA) with boron-doped diamond (BDD) anode had been initially performed under galvanostatic conditions. The main and interaction effects of four operating parameters (flow rate, applied current density, sulfate concentration and initial DTPA concentration) on mineralization performance were investigated. Under similar experimental conditions, Doehlert matrix (DM) and central composite rotatable design (CCRD) were used as statistical multivariate methods in the optimization of the anodic oxidation processes...
February 2, 2018: Chemosphere
Ricardo Salazar, M Soledad Ureta-Zañartu, Camilo González-Vargas, Christiane do Nascimento Brito, Carlos A Martinez-Huitle
This study aimed to verify the efficiency of the electrochemical oxidation process for removal the industrial textile Disperse Yellow 3 (DY3) dye in aqueous solutions using different electrocatalytic materials: boron-doped diamond (BDD), Ti/Ru0.3Ti0.7O2 and Ti/Pt anodes. The results were obtained by applying different current densities (40 and 60 mA cm-2) at 40 °C using different supporting electrolytes (Na2SO4 50 mM and NaCl 50 mM) under values of pH about 2.3, 7.0 and 10.0. Results obtained shown that the process was faster at the beginning of the process for all electrocatalytic materials, using Na2SO4 as electrolyte, being more efficient for BDD anode reaching more than 90% of TOC and color decay independently of the current density and pH and supporting electrolyte; while up to 50% of color and TOC was eliminated, using the other anodic materials in sulfate...
December 28, 2017: Chemosphere
Qi Zhang, Chunrong Wang, Longxin Jiang, Ji Qi, Jianbing Wang, Xuwen He
A novel IBAF system (altered conventional biological aerated filter (BAF) for intermittent aeration) was used to treat BDD anodes electrochemical oxidation gasification wastewater effluent, after which 454 pyrosequencing was applied to investigate the bacterial community of IBAF and demonstrate the relationship between dissolved oxygen (DO) and the bacterial community. The results showed that the concentration of COD, NH4+-N and NO3--N reached 55.08, 7.64 and 7.76 mg/L, respectively, in IBAF effluent because of changes in the DO concentration at 30 days after system start-up...
February 6, 2018: Bioresource Technology
Zhen Long, Paul Gamache, Zhimou Guo, Yuanyuan Pan, Liangji Ran, Xiaoda Liu, Yan Jin, Xingguo Liu, Lüye Liu, Lina Liang
A high-performance liquid chromatography-electrochemical detection (HPLC-ECD) method was developed to determine cyclovirobuxin D (CVB-D) levels in tablets and human blood samples. A column with a positive charge-modified C18 stationary phase, C18HCE, was selected to analyze CVB-D, because it provided a sharper and more symmetric peak for CVB-D than conventional C18 stationary phase. Two types of working electrode materials, glassy carbon (GC) and boron-doped diamond (BDD), were evaluated. BDD was found to provide better sensitivity than GC owing to its lower background current and baseline noise...
November 8, 2017: Se Pu, Chinese Journal of Chromatography
Lixin Wang, Haifen Liu, Shaopeng Yang, Chaochao Fu, Yun Li, Qiaohong Li, Zhaoxiang Huai
Mediating the backbone coplanarity and solubility of oligothiophenes, especially the head-to-head (HH) disubstituted bithiophene, to achieve an optically and electronically advantageous building block for organic semiconductor materials is a vital yet challenging task. On the other hand, exploring polymer solar cells (PSCs) processed from non-halogenated solvent is necessary toward their large-scale applications. In this contribution, we develop a HH-type bithiophene analogue (TIPS-T2) by strategically applying the triisopropylsilylethynyl (TIPS) scaffold as the side chain...
January 24, 2018: ACS Applied Materials & Interfaces
Keisuke Natsui, Hitomi Iwakawa, Norihito Ikemiya, Kazuya Nakata, Yasuaki Einaga
High faradaic efficiencies can be achieved in the production of formic acid (HCOOH) by metal electrodes, such as Sn or Pb, in the electrochemical reduction of carbon dioxide (CO2). However, the stability and environmental load in using them are problematic. Here, we investigated the electrochemical reduction of CO2 to HCOOH in a flow cell using boron-doped diamond (BDD) electrodes. BDD electrodes have superior electrochemical properties to metal electrodes, and, moreover, are highly durable. The faradaic efficiency for the production of HCOOH was as high as 94...
January 18, 2018: Angewandte Chemie
Rebecca B Phillips, Ryan R James, Matthew L Magnuson
Intentional and unintentional contamination incidents, such as terrorist attacks, natural disasters, and accidental spills, can result in large volumes of contaminated water. These waters may require pre-treatment before disposal and assurances that treated waters will not adversely impact biological processes at wastewater treatment facilities, or receiving waters. Based on recommendations of an industrial workgroup, this study addresses such concerns by studying electrochemical advanced oxidation process (EAOP) pre-treatment for contaminated waters, using a boron-doped diamond (BDD) anode, prior to discharge to wastewater treatment facilities...
January 6, 2018: Chemosphere
Gustavo Scola, Amelia Versace, Adam H Metherel, Luz A Monsalve-Castro, Mary L Phillips, Richard P Bazinet, Ana C Andreazza
BACKGROUND: Lipid metabolism has been shown to play an important role in unipolar and bipolar depression. In this study, we aimed to evaluate levels of fatty acids in patients with unipolar (MDD) and bipolar depression (BDD) in comparison to patients with bipolar disorder in euthymia (BDE) and non-psychiatric controls. METHODS: Levels of saturated fatty acids (SFAs), monounsaturated fatty acids (MUFAs) and polyunsaturated fatty acids (PUFAs) were assessed in serum of (87) patients with BD (31 euthymic, 22 depressive) or MDD (34) and (31) non-psychiatric controls through GC-FID...
January 6, 2018: Journal of Affective Disorders
Claudia Solá-Gutiérrez, M Fresnedo San Román, Inmaculada Ortiz
Triclosan (TCS) is widely used as antiseptic or preservative in many personal care products (PCPs), such as cosmetics, hand wash, toothpaste and deodorant soaps, among others. It is characterized by acute toxicity, resistance to biodegradation, environmental persistence and relatively high lipophilicity. In order to protect the environment and natural resources from the negative effects of the discharge of polluted wastewater with TCS, the application of efficient remediation technologies able to degrade the pollutant to harmless levels becomes crucial...
January 12, 2018: Science of the Total Environment
Vytas Reipa, Donald H Atha, Sanem H Coskun, Christopher M Sims, Bryant C Nelson
Exposure of mammalian cells to oxidative stress can result in DNA damage that adversely affects many cell processes. Lack of dependable DNA damage reference materials and standardized measurement methods, despite many case-control studies hampers the wider recognition of the link between oxidatively degraded DNA and disease risk. We used bulk electrolysis in an electrochemical system and gas chromatographic mass spectrometric analysis (GC/MS/MS) to control and measure, respectively, the effect of electrochemically produced reactive oxygen species on calf thymus DNA (ct-DNA)...
2018: PloS One
Deyu Liu, Junyi Wang, Chunyang Gu, Yonghai Li, Xichang Bao, Renqiang Yang
Two series of new polymers with medium and wide bandgaps to match fullerene (PC71 BM) and fullerene-free 3,9-bis(2-methylene-(3-(1,1-dicyanomethylene)-indanone))-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-d:2',3'-d']-s-indaceno[1,2-b:5,6-b']dithiophene (ITIC) acceptors are designed and synthesized, respectively. For constructing the key donor building blocks, the effective symmetry-breaking strategy is employed. Two common aromatic rings (thiophene and benzene) are chosen as one side substituted groups in the asymmetric benzodithiophene (BDT) monomers...
January 8, 2018: Advanced Materials
María Belén Carboneras, Pablo Cañizares, Manuel Andrés Rodrigo, José Villaseñor, Francisco Jesus Fernandez-Morales
In this work, a combination of electrochemical and biological technologies is proposed to remove clopyralid from Soil Washing Effluents (SWE). Firstly, soil washing was carried out to extract clopyralid from soil. After that, four different anodes-Ir-MMO, Ru-MMO, pSi-BDD and Carbon Felt (CF)-were evaluated in order to increase the biodegradability of the SWE. CF was selected because was the only one able to transform the pesticide to a more biodegradable compounds without completely mineralizing it. Finally, biological oxidation tests were performed to determine the aerobic biodegradability of the SWE generated...
December 21, 2017: Bioresource Technology
Nazely Diban, Ane Urtiaga
Electrochemical oxidation (ELOX) with boron-doped diamond (BDD) anodes was successfully applied to degrade a model aqueous solution of a mixture of commercial naphthenic acids (NAs). The model mixture was prepared resembling the NA and salt composition of oil sands process-affected water (OSPW) as described in the literature. The initial concentration of NAs between 70 and 120 mg/L did not influence the electrooxidation kinetics. However, increasing the applied current density from 20 to 100 A/m2 and the initial chloride concentration from 15 to 70 and 150 mg/L accelerated the rate of NA degradation...
January 5, 2018: Environmental Science and Pollution Research International
Mary Ensch, Vanessa Y Maldonado, Greg M Swain, Robert Rechenberg, Michael F Becker, Thomas Schuelke, Cory A Rusinek
Boron-doped diamond (BDD) is a promising electrochemical tool that exhibits excellent chemical sensitivity and stability. These intrinsic advantages coupled with the material's vast microfabrication flexibility make BDD an attractive sensing device. In this study, two different 3-in-1 BDD electrode sensors were fabricated, characterized, and investigated for their capability to detect isatin, an anxiogenic indole that possesses anticonvulsant activity. Each device is comprised of a working, reference, and auxiliary electrode, all made of BDD...
January 3, 2018: Analytical Chemistry
Kamatchi Jothiramalingam Sankaran, Mateusz Ficek, Srinivasu Kunuku, Kalpataru Panda, Chien-Jui Yeh, Jeong Young Park, Miroslaw Sawczak, Paweł Piotr Michałowski, Keh-Chyang Leou, Robert Bogdanowicz, I-Nan Lin, Ken Haenen
Carbon nanomaterials such as nanotubes, nanoflakes/nanowalls, and graphene have been used as electron sources due to their superior field electron emission (FEE) characteristics. However, these materials show poor stability and short lifetimes, which prevent their use in practical device applications. The aim of this study was to find an innovative nanomaterial possessing both high robustness and reliable FEE behavior. Herein, a hybrid structure of self-organized multi-layered graphene (MLG)-boron doped diamond (BDD) nanowall materials with superior FEE characteristics was successfully synthesized using a microwave plasma enhanced chemical vapor deposition process...
January 3, 2018: Nanoscale
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