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Haimei Zhou, Ping Lv, Hang Qi, Jinqi Ma, Jianji Wang
Numerous applications of ionic liquids (ILs) are often accompanied with the generation of aqueous wastes. Due to the high toxicity and poor biodegradability of ILs, effective chemical treatment is great of importance for their removal from aqueous solution. In this work, an ultrasound-assisted zero-valent iron/activated carbon (US-ZVI/AC) micro-electrolysis technique was used to degrade residual functionalized ILs, 1-butyl-3-methyl benzimidazolium bromide ([BMBIM]Br) and 1-allyl-3-methylimidazolium chloride ([AMIM]Cl) in aqueous solution, and the degradation degree, degradation kinetics and possible degradation pathways were investigated...
February 21, 2018: Environmental Technology
Kasinath Ojha, Soumen Saha, Preeti Dagar, Ashok K Ganguli
Hydrogen fuel is among the cleanest renewable resources and is the best alternative to fossil fuels for the future. Hydrogen can be best produced by means of electrolysis or photoelectrolysis of water among the various routes available for hydrogen production. So far, Pt has been recognized as the best electrode material for electrochemical hydrogen production. However, the cost of the catalyst, activity, and durability make Pt-catalyzed hydrogen production unsuitable on a commercial scale. It has hence become imperative to explore low-cost, highly active and durable HER catalysts to replace platinum as a catalyst...
February 20, 2018: Physical Chemistry Chemical Physics: PCCP
Benzhou Gong, Yingmu Wang, Jiale Wang, Wei Huang, Jian Zhou, Qiang He
A modified anaerobic-anoxic-oxic (AAO) reactor embedding electrolysis was constructed for treatment of low carbon/nitrogen (C/N) wastewater. The effect of different current conditions on the performance of reactor was investigated in this study. When the current ranged from 0 mA to 200 mA, the removal efficiency of total nitrogen (TN) increased from 61.25% (0 mA) to 75.60% (200 mA), and that of total phosphorus (TP) increased from 72.24% (0 mA) to 93.93% (200 mA). In addition, the removal efficiencies of chemical oxygen demand (COD) and NH4 + -N were not affected...
February 7, 2018: Bioresource Technology
Arwa Aboudalle, Florence Fourcade, Aymen Amin Assadi, Lionel Domergue, Hayet Djelal, Thomas Lendormi, Samir Taha, Abdeltif Amrane
In this study, the monitoring of reactive oxygen species and the regeneration of the ferrous ions catalyst were performed during electro-Fenton (EF) process to highlight the influence of operating parameters. The removal of metronidazole (MTZ) was implemented in an electrochemical mono-compartment batch reactor under various ranges of current densities, initial MTZ and ferrous ions concentrations, and pH values. It was found that under 0.07 mA cm -2 , 0.1 mM of ferrous ions and pH = 3, the efficiency of 100 mg L -1 MTZ degradation and mineralization were 100% within 20 min and 40% within 135 min of electrolysis, respectively...
February 13, 2018: Chemosphere
Salvador Cotillas, Davide Clematis, Pablo Cañizares, Maria Paola Carpanese, Manuel A Rodrigo, Marco Panizza
This work focuses on the treatment of synthetic wastewater polluted with dye Procion Red MX-5B by different Electrochemical Advanced Oxidation Processes (EAOP) based on diamond anodes. The influence of the current density and the supporting electrolyte has been studied on dye removal and total mineralization of the organic matter. Results show that electrolysis with diamond electrodes is a suitable technology for an efficient degradation of dye. Nonetheless, the process efficiency increases when using chloride as supporting electrolyte because of the electrochemical generation of hypochlorite in wastewater which significantly contribute to dye removal...
February 3, 2018: Chemosphere
Chenmu Zhang, Ning Duan, Linhua Jiang, Fuyuan Xu, Jin Luo
The influence of Mn 2+ ions on the generation of heavy metal anode slime during zinc electrolysis industry was extensively investigated using several electrochemical methods, electron microscope technologies, and particle size analysis. Results showed that the Mn 2+ could obviously promote oxygen evolution reaction (OER) and thereby weaken oxidation efficiency of Mn 2+ (η MnO2 ) and dissolution of Pb 2+ . The significant improvement in kinetic parameters for OER was found in electrolytes of 1 and 3 g/L Mn 2+ , but became unstable as the Mn 2+ concentration increased to 10 g/L...
February 15, 2018: Environmental Science and Pollution Research International
Dandan Yuan, Lei Tian, Zhida Li, Hong Jiang, Chao Yan, Jing Dong, Hongjun Wu, Baohui Wang
Herein, we report the solar thermal electrochemical process (STEP) aniline oxidation in wastewater for totally solving the two key obstacles of the huge energy consumption and passivation film in the electrochemical treatment. The process, fully driven by solar energy without input of any other energies, sustainably serves as an efficient thermoelectrochemical oxidation of aniline by the control of the thermochemical and electrochemical coordination. The thermocoupled electrochemical oxidation of aniline achieved a fast rate and high efficiency for the full minimization of aniline to CO 2 with the stability of the electrode and without formation of polyaniline (PAN) passivation film...
February 15, 2018: Scientific Reports
Young Eun Kim, Hae Sung Yun, Soon Kwan Jeong, Yeo Il Yoon, Sung Chan Nam, Ki Tae Park
The electrocatalytic stability of tin (Sn) nanoparticle for electrochemical reduction of CO2 to formate was measured using an H-type cell during electrolysis for 40 h. The Faradaic efficiency (FE) and partial current density (PCD) of formate formation reduced as much as 10% and 13% of the maximum values, respectively. To elucidate the decrease in FE and PCD, the changes in the morphology, chemical composition, the crystalline structure were investigated. The spherical Sn nanoparticles were pulverized after electrolysis...
February 1, 2018: Journal of Nanoscience and Nanotechnology
Juan D Berná-Serna, José A García-Vidal, Pilar Escolar-Reina, Juan D Berná-Mestre
Mammary fistula (MF) is a recurrent condition characterised by the draining of abscesses around the areola. The best management for MF remains challenging. Moreover, the main problem is the high recurrence rate of this disease. MF is considered a chronic process. The percutaneous electrolysis (PE) technique involves the application of a galvanic current with an ultrasound-guided needle to induce ablation and repair of the affected tissue. Good results have been obtained with PE in chronic tendinopathies. Below we present a hypothesis that PE may be a new therapeutic option for MF...
March 2018: Medical Hypotheses
Bowei Zhang, Yu Hui Lui, Anand P S Gaur, Bolin Chen, Xiaohui Tang, Zhiyuan Qi, Shan Hu
Efficiency of hydrogen evolution via water electrolysis is mainly impeded by the kinetically sluggish oxygen evolution reaction (OER). Thus, it is of great significance to develop highly active and stable OER catalyst for alkaline water electrolysis or to substitute the more kinetically demanding acidic OER with a facile electron-donating reaction, such that OER is no longer the bottleneck half reaction for either acidic or alkaline water electrolysis. Herein, the hierarchical Fe-Ni phosphide shelled with ultrathin carbon networks on Ni foam (FeNiP@C) is reported and shows exceptional OER activity and enhanced chemical stability in 1M KOH...
February 15, 2018: ACS Applied Materials & Interfaces
Junyu Shen, Mei Wang, Liang Zhao, Jian Jiang, Hong Liu, Jinxuan Liu
Highly efficient, robust, and cheap water oxidation electrodes are of great significance for large-scale production of hydrogen by electrolysis of water. Here, a self-supported stainless steel (SS) nanocone array coated with a layer of nanoparticulate Ni-Fe oxides/(oxy)hydroxides was fabricated by a facile, low-cost, and easily scalable two-step process. The construction of a nanocone array on the surface of AISI 304 SS plate by acid corrosion greatly enlarged the specific surface area of the substrate, and the subsequent formation of a layer of Ni-Fe oxides/(oxy)hydroxides featuring the NiFe 2 O 4 spinel phase on the nanocone surface by electrodeposition of [Ni(bpy) 3 ] 2+ significantly enhanced the intrinsic activity and the stability of the SS-based electrode...
February 15, 2018: ACS Applied Materials & Interfaces
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
Zhengsheng Yu, Xiaoyun Leng, Shuai Zhao, Jing Ji, Tuoyu Zhou, Aman Khan, Apurva Kakde, Pu Liu, Xiangkai Li
Anaerobic digestion (AD) has been widely used for biogas or biofuel generation from waste treatment. Because a low production rate and instability of AD occur frequently, various technologies have been applied to improvement of AD. Microbial electrolysis cells (MECs), an emerging technology, can convert organic matter into hydrogen, methane, and other value-added products. Recent studies showed that application of MEC to AD (MEC-AD) can accelerate degradation of a substrate (including recalcitrant compounds) and alter AD microbial community by enriching exoelectrogens and methanogens thus increasing biogas production...
February 12, 2018: Bioresource Technology
Álvaro Iborra-Marcos, Juan José Ramos-Álvarez, Guillermo Rodriguez-Fabián, Federico Del Castillo-González, Antonio López-Román, Carlos Polo-Portes, Manuel Villanueva-Martínez
BACKGROUND: Corticosteroid infiltration (CI) is commonly used for treatment of plantar fasciosis. In recent years, however, interest has grown in the use of intratissue percutaneous electrolysis (EPI) for the treatment of tendinopathies. The aim of our study was to compare the effectiveness of the above techniques in the treatment of plantar fasciosis. METHODS: The results achieved over a period of 1 year following the use of these techniques to treat plantar fasciosis were examined...
February 1, 2018: Foot & Ankle International
Dongpeng Yan, Muhammad Arif, Ghulam Yasin, Muhammad Shakeel, Xiaoyu Fang, Rui Gao, Shengfu Ji
The development of durable, low cost and efficient photo/electrolysis for oxygen/hydrogen evolution reactions (OER and HER) is important to fulfill the increasing energy requirement. In this work, high-efficiency and active photo/electrochemical catalysts, CoMn-LDH@g-C3N4 hybrids, have been synthesized successfully through a facile in situ co-precipitation method at room temperature. The CoMn-LDH@g-C3N4 composite exhibits an obvious OER electrocatalytic performance with current density of 40 mA·cm-2 at overpotential of 350 mV for water oxidation, which is 2...
February 12, 2018: Chemistry, An Asian Journal
Anantha N Subba Rao, Venkatesha T Venkatarangaiah
Ti/TiO2-NTs/Sb-SnO2 electrode was prepared by gradient pulsed electrodeposition, and its electrochemical properties were evaluated. The catalytic activity and reusability of the electrode were tested by electrochemical oxidation (EO) and photoelectrochemical oxidation (PEO) of organics present in textile industry wastewater (TWW) and coffee bean processing industry wastewater (CWW). COD removal of ~ 41% was achieved after 5-h electrolysis under a constant applied current density of 30 mA cm-2 for TWW and 50 mA cm-2 for CWW...
February 9, 2018: Environmental Science and Pollution Research International
Quyen T Nguyen, Phuc Dinh Nguyen, Duc N Nguyen, Quang Duc Truong, Tran Thi Kim Chi, Thuy Ung, Itaru Honma, Nguyen Quang Liem, Phong D Tran
Amorphous molybdenum selenide nanopowder, obtained by refluxing Mo(CO)6 and Se precursors in dichlorobenzene, shows several structural and electrochemical similarities to the amorphous molybdenum sulfide analogue. The molybdenum selenide displays attractive catalytic properties for the hydrogen evolution reaction in water over a wide range of pH. In a pH 0 solution, it operates with a small onset overpotential of 125 mV and requires an overpotential of 270 mV for generating a catalytic current of 10 mA/cm2...
February 9, 2018: ACS Applied Materials & Interfaces
Ying Zhang, Xiaolong Zhang, Alan M Bond, Jie Zhang
In this study, a selective Sn based catalytic system that electrochemically reduces CO2 to formate has been developed based on a new substrate effect. Dendritic Sn catalysts were synthesised by hydrogen gas bubble assisted electrodeposition on Pt, Cu, Sn or In substrates and applied to electrocatalytic reduction of CO2. The four substrates exhibit a hydrogen evolution activity that follows the order Pt > Cu > Sn > In. However, the Cu supported dendritic Sn catalyst provides the best selectivity towards formate formation (67...
February 9, 2018: Physical Chemistry Chemical Physics: PCCP
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
Gabriela Coria, Tzayam Pérez, Ignasi Sirés, Enric Brillas, José L Nava
The degradation of solutions of the antibiotic levofloxacin (LVN) in sulfate medium at pH 3.0 has been investigated at pre-pilot scale by solar photoelectro-Fenton (SPEF) process. The flow plant included an FM01-LC filter-press cell equipped with a Ti|Pt anode and a three-dimensional-like air-diffusion cathode, connected to a compound parabolic collector as photoreactor and a continuous stirred tank under recirculation batch mode. The effect of volumetric flow rate on H2O2 electrogeneration from O2 reduction was assessed...
February 1, 2018: Chemosphere
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