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Xiaohu Li, Xiangdan Jin, Nannan Zhao, Irini Angelidaki, Yifeng Zhang
Aniline-containing wastewater can cause significant environmental problems and threaten the humans's life. However, rapid degradation of aniline with cost-efficient methods remains a challenge. In this work, a novel microbial electrolysis cell with bipolar membrane was integrated with Fenton reaction (MEC-Fenton) for efficient treatment of real wastewater containing a high concentration (4460 ± 52 mg L(-1)) of aniline. In this system, H2O2 was in situ electro-synthesized from O2 reduction on the graphite cathode and was simultaneously used as source of OH for the oxidation of aniline wastewater under an acidic condition maintained by the bipolar membrane...
April 19, 2017: Water Research
Yan Li, Sen Li, Yingmin Wang, Jun Wang, Hui Liu, Xinqian Liu, Lifeng Wang, Xiaoguang Liu, Wendong Xue, Ning Ma
In this work, phosphorus-doped graphene quantum dots (P-GQDs) with a high phosphorus doping content (>7 at%) are synthesized via an electrochemical approach. Sodium phytate (C6H6Na12O24P6), a green food antioxidant additive, is used as the electrolyte for providing both a phosphorus source and an electrolysis environment. The obtained P-GQDs exhibit excellent scavenging activity of free radicals, such as hydroxyl radicals (˙OH) and 2,2-diphenyl-1-picrylhydrazyl (DPPH). Combined with Raman, FT-IR, and XPS spectral analyses, the reason for high phosphorus content and the mechanism of free radical scavenging of P-GQDs are investigated in our work...
April 21, 2017: Physical Chemistry Chemical Physics: PCCP
Dehua Xiong, Qingqing Zhang, Sitaramanjaneya Mouli Thalluri, Junyuan Xu, Wei Li, Xiuli Fu, Lifeng Liu
We report a very easy and cost-effective approach to the fabrication of monolithic Co9S8 water oxidation electrodes (Co@Co9S8), which is fabricated by one-step hydrothermal treatment of commercially available cobalt foam in the presence of thiourea. The morphology, crystal structure, microstructure, and composition of as-fabricated Co@Co9S8 electrodes are examined using scanning electron microscopy (SEM), powder X-ray diffraction (XRD), transmission electron microscope (TEM), and X-ray photoelectron spectroscopy (XPS), and their electrochemical properties are investigated by cyclic voltammetry (CV), chronopotentiometry (CP), chronoamperometry (CA), and electrochemical impedance spectroscopy (EIS)...
April 21, 2017: Chemistry: a European Journal
Fera R Dewi, Roger Stanley, Shane M Powell, Christopher M Burke
Electrolysed oxidising water (E.O. water) is produced by electrolysis of sodium chloride to yield primarily chlorine based oxidising products. At neutral pH this results in hypochlorous acid in the un-protonated form which has the greatest oxidising potential and ability to penetrate microbial cell walls to disrupt the cell membranes. E.O. water has been shown to be an effective method to reduce microbial contamination on food processing surfaces. The efficacy of E.O. water against pathogenic bacteria such as Listeria monocytogenes, Escherichia coli and Vibrio parahaemolyticus has also been extensively confirmed in growth studies of bacteria in culture where the sanitising agent can have direct contact with the bacteria...
April 2017: Journal of Food Science and Technology
Guangsen Xia, Yujue Wang, Bin Wang, Jun Huang, Shubo Deng, Gang Yu
Previous studies indicate that effective generation of hydrogen peroxide (H2O2) from cathodic oxygen (O2) reduction is critical for the improved water treatment performance (e.g., enhanced pollutant degradation and reduced bromate formation) during the electro-peroxone (E-peroxone) process (a combined process of electrolysis and ozonation). However, undesired reactions (e.g., O3, H2O2, and H2O reductions) may occur in competition with O2 reduction at the cathode. To get a better understanding of how these side reactions would affect the process, this study investigated the cathodic reaction mechanisms during electrolysis with O2/O3 gas mixture sparging using various electrochemical techniques (e...
April 4, 2017: Water Research
Guangyin Zhen, Xueqin Lu, Takuro Kobayashi, Lianghu Su, Gopalakrishnan Kumar, Péter Bakonyi, Yan He, Periyasamy Sivagurunathan, Nándor Nemestóthy, Kaiqin Xu, Youcai Zhao
The dispersion of granules in upflow anaerobic sludge blanket (UASB) reactor represents a critical technical issue in methanolic wastewater treatment. In this study, the potentials of coupling a microbial electrolysis cell (MEC) into an UASB reactor for improving methanolic wastewater biodegradation, long-term process stability and biomethane recovery were evaluated. The results indicated that coupling a MEC system was capable of improving the overall performance of UASB reactor for methanolic wastewater treatment...
April 5, 2017: Chemosphere
Angel T Garcia-Esparza, Tatsuya Shinagawa, Samy Ould-Chikh, Muhammad Qureshi, Xuyuan Peng, Nini Wei, Dalaver H Anjum, Alain Clo, Tsu-Chien Weng, Dennis Nordlund, Dimosthenis Sokaras, Jun Kubota, Kazunari Domen, Kazuhiro Takanabe
For overall water-splitting systems, it is essential to establish O2 -insensitive cathodes that allow cogeneration of H2 and O2 . An acid-tolerant electrocatalyst is described, which employs a Mo-coating on a metal surface to achieve selective H2 evolution in the presence of O2 . In operando X-ray absorption spectroscopy identified reduced Pt covered with an amorphous molybdenum oxyhydroxide hydrate with a local structural order composed of polyanionic trimeric units of molybdenum(IV). The Mo layer likely hinders O2 gas permeation, impeding contact with active Pt...
April 13, 2017: Angewandte Chemie
Si-Ling Fang, Tsu-Chin Chou, Satyanarayana Samireddi, Kuei-Hsien Chen, Li-Chyong Chen, Wei-Fu Chen
Production of hydrogen from water electrolysis has stimulated the search of sustainable electrocatalysts as possible alternatives. Recently, cobalt phosphide (CoP) and molybdenum phosphide (MoP) received great attention owing to their superior catalytic activity and stability towards the hydrogen evolution reaction (HER) which rivals platinum catalysts. In this study, we synthesize and study a series of catalysts based on hybrids of CoP and MoP with different Co/Mo ratio. The HER activity shows a volcano shape and reaches a maximum for Co/Mo = 1...
March 2017: Royal Society Open Science
Tobias J Sherbow, James C Fettinger, Louise A Berben
Redox-active ligands bring electron- and proton-transfer reactions to main-group coordination chemistry. In this Forum Article, we demonstrate how ligand pKa values can be used in the design of a reaction mechanism for a ligand-based electron- and proton-transfer pathway, where the ligand retains a negative charge and enables dihydrogen evolution. A bis(pyrazolyl)pyridine ligand, (iPr)Pz2P, reacts with 2 equiv of AlCl3 to afford [((iPr)Pz2P)AlCl2(THF)][AlCl4] (1). A reaction involving two-electron reduction and single-ligand protonation of 1 affords [((iPr)HPz2P(-))AlCl2] (2), where each of the electron- and proton-transfer events is ligand-centered...
April 12, 2017: Inorganic Chemistry
Ali Akbar Babaei, Farshid Ghanbari, Reza Jalilzadeh Yengejeh
Photoelectro-Fenton (PEF) was carried out for concurrent removals of inorganic and organic pollutants with simultaneous applications of two different anodes (iron and copper). Cadmium and Direct Orange 26 (DO26) were selected as samples of the contaminants of textile wastewater and influential parameters (pH, current density, H2O2 dosage and electrolysis time) of PEF were evaluated on Cd and DO26 removals. Both mechanisms of coagulation and oxidation affected the removal of both pollutants. Optimal conditions were achieved with pH = 4...
April 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Waheed Miran, Mohsin Nawaz, Jiseon Jang, Dae Sung Lee
Wastewaters are increasingly being considered as renewable resources for the sustainable production of electricity, fuels, and chemicals. In recent years, bioelectrochemical treatment has come to light as a prospective technology for the production of energy from wastewaters. In this study, a bioelectrochemical system (BES) enriched with sulfate-reducing bacteria (SRB) in the anodic chamber was proposed and evaluated for the biodegradation of recalcitrant chlorinated phenol, electricity generation (in the microbial fuel cell (MFC)), and production of hydrogen peroxide (H2O2) (in the microbial electrolysis cell (MEC)), which is a very strong oxidizing agent and often used for the degradation of complex organics...
April 5, 2017: Water Research
Hongjie An, Beng Hau Tan, James Guo Sheng Moo, Sheng Liu, Martin Pumera, Claus-Dieter Ohl
Graphene nanobubbles are of significant interest due to their ability to trap mesoscopic volumes of gas for various applications in nanoscale engineering. However, conventional protocols to produce such bubbles are relatively elaborate and require specialized equipment to subject graphite samples to high temperatures or pressures. Here, we demonstrate the formation of graphene nanobubbles between layers of highly oriented pyrolytic graphite (HOPG) with electrolysis. Although this process can also lead to the formation of gaseous surface nanobubbles on top of the substrate, the two types of bubbles can easily be distinguished using atomic force microscopy...
April 10, 2017: Nano Letters
Chenru Li, Kun Qian, Qinyao Liu, Qianyi Zhang, Chen Yao, Wei Song, Yihong Wang
Benzimidazole is an important intermediate in pharmaceutical and dyeing industry and it is usually difficult to be degraded by many treatment technologies. Looking for a highly effective, low cost, environment-friendly degradation process for wastewater containing these compounds is of great significance to reduce environmental pollution. Based on the structure of benzimidazole substances and analysis of varies treatment techniques, the micro-electrolysis (ME) coupled with Fenton technique was chosen to degrade those industrial benzimidazole wastewater with high chemical oxygen demand (COD)...
April 10, 2017: Environmental Technology
Peng Li, Zhipeng Liu, Xuegang Wang, Yadan Guo, Lizhang Wang
Reactivity of sodium persulfate (PS) in the decolorization of methyl orange (MO) in aqueous solution using an iron-carbon micro-electrolysis (ICE) method was investigated. The effects of sodium persulfate doses, pH, Fe-to-C mass ratios, initial MO concentration as well as the reaction temperature were comprehensively studied in batch experiments. The ICE-PS coupled process was more suitable for wide ranges of pH, initial MO concentration and reaction temperature, accompanied by the reduction of Fe compared ICE...
April 5, 2017: Chemosphere
Xiaohu Li, Ruizhe Zhang, Yawei Qian, Irini Angelidaki, Yifeng Zhang
The impact of different anode acclimation methods for enhancing hydrogen production in microbial electrolysis cell (MEC) was investigated in this study. The anodes were first acclimated in microbial fuel cells using acetate, butyrate and corn stalk fermentation effluent (CSFE) as substrate before moving into MECs, respectively. Subsequently, CSFE was used as feedstock in all the three MECs. The maximum hydrogen yield with the anode pre-acclimated with butyrate (5.21±0.24L H2/L CSFE) was higher than that pre-acclimated with acetate (4...
March 30, 2017: Bioresource Technology
Israel Joel Koenka, Peter C Hauser
A pre-concentration method for anions is presented, which relies on a trap created by applying an electric field against a hydrodynamic flow of the sample. The trapping zone is created in front of a cation exchange membrane which allows the isolation of the electrode and thus prevents any interference by electrolysis products. Pre-concentration factors of up to 20 were demonstrated for nitrate and formate as model analyte ions and were linearly related to the sample volume passed through the trap. A discrimination between the ions was found possible by adjustment of the hydrodynamic flow velocity...
April 7, 2017: Electrophoresis
Junyu Shen, Mei Wang, Peili Zhang, Jian Jiang, Licheng Sun
Two water soluble copper(ii) complexes containing amine-pyridine ligands were found to be catalytically active for water oxidation reactions in basic solutions, with observed rate constants of 13.1-18.7 s(-1). These complexes are robust in basic solutions and displayed good stability over 5 h of electrolysis in pH 11.5 phosphate buffer at 1.4 V vs. NHE.
April 5, 2017: Chemical Communications: Chem Comm
Heyang Yuan, Zhen He
Hydrogen gas is a green energy carrier with great environmental benefits. Microbial electrolysis cells (MECs) can convert low-grade organic matter to hydrogen gas with low energy consumption and have gained a growing interest in the past decade. Cathode catalysts for the hydrogen evolution reaction (HER) present a major challenge for the development and future applications of MECs. An ideal cathode catalyst should be catalytically active, simple to synthesize, durable in a complex environment, and cost-effective...
April 4, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
Robert A Green, Katherine E Jolley, Azzam A M Al-Hadedi, Derek Pletcher, David C Harrowven, Oscar De Frutos, Carlos Mateos, David J Klauber, Juan A Rincón, Richard C D Brown
Electrochemical deprotection of p-methoxybenzyl (PMB) ethers was performed in an undivided electrochemical flow reactor in MeOH solution, leading to the unmasked alcohol and p-methoxybenzaldehyde dimethyl acetal as a byproduct. The electrochemical method removes the need for chemical oxidants, and added electrolyte (BF4NEt4) can be recovered and reused. The method was applied to 17 substrates with high conversions in a single pass, yields up to 92%, and up to 7.5 g h(-1) productivity. The PMB protecting group was also selectively removed in the presence of some other common alcohol protecting groups...
April 4, 2017: Organic Letters
Michael H Gold, Anneke Andriessen, Steven H Dayan, Sabrina G Fabi, Z Paul Lorenc, Meagan-Helen Henderson Berg
BACKGROUND: A pre-and postprocedure regime aimed at prevention of infection, reduction of inflammation and risk of scarring, is to enable optimal outcomes. OBJECTIVES: The role of a hypochlorous acid containing spray and translucent scar gel formulation that combines modified silicon oil with hypochlorous acid, was explored for pre- and postprocedure treatment and scar management. METHODS: For this purpose a literature review was conducted to explore the value of the technology used in pre-and postprocedural regimes...
March 30, 2017: Journal of Cosmetic Dermatology
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