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Recent advances in the electrochemical oxidation water treatment: Spotlight on byproduct control

Yang Yang

《环境科学与工程前沿(英文)》 2020年 第14卷 第5期 doi: 10.1007/s11783-020-1264-7

摘要: Abstract • Byproduct formation mechanisms during electrochemical oxidation water treatment. • Control byproduct formation by quenchers. • Process optimization to suppress byproduct formation. Electrochemical oxidation (EO) is a promising technique for decentralized wastewater treatment, owing to its modular design, high efficiency, and ease of automation and transportation. The catalytic destruction of recalcitrant, non-biodegradable pollutants (per- and poly-fluoroalkyl substances (PFAS), pharmaceuticals, and personal care products (PPCPs), pesticides, etc.) is an appropriate niche for EO. EO can be more effective than homogeneous advanced oxidation processes for the degradation of recalcitrant chemicals inert to radical-mediated oxidation, because the potential of the anode can be made much higher than that of hydroxyl radicals (EOH = 2.7 V vs. NHE), forcing the direct transfer of electrons from pollutants to electrodes. Unfortunately, at such high anodic potential, chloride ions, which are ubiquitous in natural water systems, will be readily oxidized to chlorine and perchlorate. Perchlorate is a to-be-regulated byproduct, and chlorine can react with matrix organics to produce organic halogen compounds. In the past ten years, novel electrode materials and processes have been developed. However, spotlights were rarely focused on the control of byproduct formation during EO processes in a real-world context. When we use EO techniques to eliminate target contaminants with concentrations at μg/L-levels, byproducts at mg/L-levels might be produced. Is it a good trade-off? Is it possible to inhibit byproduct formation without compromising the performance of EO? In this mini-review, we will summarize the recent advances and provide perspectives to address the above questions.

关键词: Electrochemical water treatment     Byproducts     Perchlorate    

Integrated energy view of wastewater treatment: A potential of electrochemical biodegradation

《环境科学与工程前沿(英文)》 2022年 第16卷 第4期 doi: 10.1007/s11783-021-1486-3

摘要:

• Energy is needed to accelerate the biological wastewater treatment.

关键词: Biological wastewater treatment     Integrated energy view     Electroactive bacteria     Extracellular electron transfer    

Electrocoagulation process for the treatment of metal-plating wastewater: Kinetic modeling and energy

Fatih Ilhan, Kubra Ulucan-Altuntas, Yasar Avsar, Ugur Kurt, Arslan Saral

《环境科学与工程前沿(英文)》 2019年 第13卷 第5期 doi: 10.1007/s11783-019-1152-1

摘要: The wastewater from industrial area was treated by EC via Fe and Al electrodes. Cu, Ni, Cr and Zn were highly removed at the first minutes, simultaneously. Pseudo-2nd-order was found to be more suitable for kinetics. Adsorption capacities based on kinetic modeling were observed as Cr>Cu>Ni>Zn. The chemical cost in the case of pH adjustment after EC was less as 3.83 $/m3. It is known that wastewater produced by the metal-plating industry contains several heavy metals, which are acidic in nature and therefore toxic for the environment and for living creatures. In particular, heavy metals enter the food chain and accumulate in vital organs and cause serious illness. The precipitation of these metals is mostly achieved by pH adjustment, but as an alternative to this method, the electrocoagulation process has investigated in this study using iron and aluminum electrodes. The effects of the pH adjustment on removal before and after the electrocoagulation process were investigated, and cost analyses were also compared. It was observed that a high proportion of removal was obtained during the first minutes of the electrocoagulation process; thus, the current density did not have a great effect. In addition, the pH adjustment after the electrocoagulation process using iron electrodes, which are 10% more effective than aluminum electrodes, was found to be much more efficient than before the electrocoagulation process. In the process where kinetic modeling was applied, it was observed that the heavy metal removal mechanism was not solely due to the collapse of heavy metals at high pH values, and with this modeling, it was seen that this mechanism involved adsorption by iron and aluminum hydroxides formed during the electrocoagulation process. When comparing the ability of heavy metals to be adsorbed, the sequence was observed to be Cr>Cu>Ni>Zn, respectively.

关键词: Electrochemical treatment     Heavy metals     Kinetic modeling     Pseudo first order kinetic     Pseudo second order kinetic    

Recent advances in electrochemical decontamination of perfluorinated compounds from water: a review

《环境科学与工程前沿(英文)》 2023年 第17卷 第2期 doi: 10.1007/s11783-023-1618-z

摘要:

● Recent advances in the electrochemical decontamination of PFAS are reviewed.

关键词: Perfluorinated compounds     Electrochemical approach     Working mechanisms     Impacting factor     Coupled process    

厌氧产能生物技术用于城市污水处理的研究进展

李文卫, 俞汉青

《工程(英文)》 2016年 第2卷 第4期   页码 438-446 doi: 10.1016/J.ENG.2016.04.017

摘要:

城市污水处理长期以来被认为是一个高能耗、高成本的过程。传统处理方法通过消耗大量能量来破坏污水中蕴含的能量物质,仅有很少的一部分能量和营养物质可以得到回用。近年来,一些污水处理厂已经开始尝试通过技术革新和旧技术升级来将自己转变为“资源工厂”。其中,厌氧生物处理作为一种能将污水中的有机物转化为能源并且保留其中的营养物质不被破坏的技术,重新引起了人们的兴趣。但是,这类技术的实际应用目前仍面临着技术和经济方面的诸多挑战。本文综述了当前废水厌氧生物处理技术的最新进展状况,重点介绍了侧流强化污泥厌氧消化、厌氧膜生物反应器(AnMBR)和微生物电化学系统,展望了这些技术走向应用所面对的机遇和挑战。本文旨在为城市污水厌氧处理工艺的设计和优化提供参考。

关键词: 厌氧     产能     膜生物反应器     微生物电化学系统     城市污水处理    

Research progress in tribo-electrochemistry and tribo-electrochemical polishing

ZHAI Wenjie

《机械工程前沿(英文)》 2007年 第2卷 第4期   页码 463-467 doi: 10.1007/s11465-007-0080-0

摘要: In this paper, the status quo and recent progress in the research on tribo-electrochemistry in aqueous and non-aqueous media, respectively, are reviewed. Much more attention has been paid to the tribo-electrochemical mechanisms for the control of friction and wear. Based on a summary of the conventional polishing principles of hard and brittle materials, the tribo-electrochemical polishing method is proposed. The results of the preliminary test show that tribo-electrochemical polishing is promising to become a critical technology in the high efficient polishing and planarization of microelectronic materials.

关键词: tribo-electrochemical mechanisms     planarization     non-aqueous     tribo-electrochemistry     summary    

Enhanced electrochemical performance of CoNiS@TiCT electrode material through doping of cobalt element

《化学科学与工程前沿(英文)》 2023年 第17卷 第10期   页码 1440-1449 doi: 10.1007/s11705-023-2333-9

摘要: The composite electrode of CoNiSx and Ti3C2Tx MXene was successfully prepared using a one-step hydrothermal method under the in-situ doping of the cobalt element. The effects of in-situ doping of the cobalt element on the micromorphology and electrochemical performance of the electrodes were investigated. After in-situ doping of the cobalt element, NiS with a needle-like structure was converted into a CoNiSx with petal-like structure. The petal-like CoNiSx with a rough surface was very dense and evenly wrapped on the surface and interlamination of Ti3C2Tx, which helped increase the specific surface area and pore volume of the electrode. Under the identical test conditions, CoNiSx@Ti3C2Tx had a higher specific capacitance and capacitance retention than NiS@Ti3C2Tx. This result indicated that the in-situ doping of the cobalt element promoted the electrochemical performance of the electrode. The energy density of the CoNiSx@Ti3C2Tx/nickel foam (NF)//activated carbon (AC)/NF asymmetric supercapacitor device was 59.20 Wh·kg–1 at a power density of 826.73 W·kg–1, which was much higher than that of NiS@Ti3C2Tx/NF//AC/NF. Three CoNiSx@Ti3C2Tx/NF//AC/NF in series were able to illuminate the light emitting diode lamp for about 10 min, which was higher than the 5 min of three NiS@Ti3C2Tx/NF//AC/NF in series under the same condition. The CoNiSx@Ti3C2Tx/NF//AC/NF with high energy density had better application potential in energy storage than the NiS@Ti3C2Tx/NF//AC/NF.

关键词: MXene     supercapacitor     cobalt doping     structure characterization     electrochemical performance    

Effect of denitrifying bacteria on the electrochemical reaction of activated carbon fiber in electrochemical

YING Diwen, JIA Jinping, ZHANG Lehua

《环境科学与工程前沿(英文)》 2007年 第1卷 第3期   页码 305-310 doi: 10.1007/s11783-007-0051-z

摘要: An electrochemical-activated denitrifying biofilm system consisting of activated carbon fiber electrodes immobilized with denitrifying bacteria film as cathode was studied. A revised model for an electrochemical-activated denitrifying biofilm was developed and validated by electrochemical analysis of cathodal polarization curves and nitrate consumption rate. The cathodal polarization curve and nitrate consumption rate were introduced to verify the rate of electrochemical reaction and the activity of denitrifying bacteria, respectively. It was shown that the denitrification process effectively strengthened the electrochemical reaction while the electron also intensified denitrification activity. Electron was transferred between electrochemical process and biological process not only by hydrogen molecule but also by new produced active hydrogen atom. Additionally, a parameter of apparent exchange current density was deprived from the cathodal polarization curve with high overpotential, and a new bio-effect current density was defined through statistical analysis, which was linearly dependent to the activity of denitrification bacteria. Activated carbon fiber (ACF) electrode was also found to be more suitable to the electrochemical denitrifying system compared with graphite and platinum.

关键词: ACF     apparent exchange     hydrogen molecule     activated     biological process    

Special issue on electrochemical conversion and utilization of hydrogen energy

《能源前沿(英文)》 2024年 第18卷 第3期   页码 263-264 doi: 10.1007/s11708-024-0944-6

摘要: Special issue on electrochemical conversion and utilization of hydrogen energy

关键词: hydrogen energy    

Emerging electrochemical processes for materials recovery from wastewater: Mechanisms and prospects

Lingchen Kong, Xitong Liu

《环境科学与工程前沿(英文)》 2020年 第14卷 第5期 doi: 10.1007/s11783-020-1269-2

摘要: Abstract • Mechanisms for selective recovery of materials in electrochemical processes are discussed. • Wastewaters that contain recoverable materials are reviewed. • Application prospects are discussed from both technical and non-technical aspects. Recovering valuable materials from waste streams is critical to the transition to a circular economy with reduced environmental damages caused by resource extraction activities. Municipal and industrial wastewaters contain a variety of materials, such as nutrients (nitrogen and phosphorus), lithium, and rare earth elements, which can be recovered as value-added products. Owing to their modularity, convenient operation and control, and the non-requirement of chemical dosage, electrochemical technologies offer a great promise for resource recovery in small-scale, decentralized systems. Here, we review three emerging electrochemical technologies for materials recovery applications: electrosorption based on carbonaceous and intercalation electrodes, electrochemical redox processes, and electrochemically induced precipitation. We highlight the mechanisms for achieving selective materials recovery in these processes. We also present an overview of the advantages and limitations of these technologies, as well as the key challenges that need to be overcome for their deployment in real-world systems to achieve cost-effective and sustainable materials recovery.

关键词: Materials recovery     Electrosorption     Capacitive deionization     Redox processes     Electrochemical precipitation    

Investigation of electrochemical degradation and application of e-paper dyes in organic solvents

Luhai LI, Ming WANG, Yi FANG, Shunan QIAO

《化学科学与工程前沿(英文)》 2009年 第3卷 第2期   页码 182-185 doi: 10.1007/s11705-009-0062-3

摘要: To avoid environmental pollution due to organic dye solutions, the electrophoresis and degradation of dye in organic solvents such as alcohol were investigated. Many dyes were tested in the Indium tin oxide (ITO) electrode driving cell, and about 15 dyes moved under voltage driving. Both the curves of ultraviolet-visible (UV-Vis) and infrared (IR) spectra of the electrophoresis samples showed that the metal complexes Red 04 and Acid Black 1 were degradable in alcohol solution by electrochemical reaction. The cyclic volt-ampere curves of the samples from the electrochemical working station proved that electrochemical reactions took place. Based on the analysis of UV-Vis and IR spectra, the electrochemical degradation products of azo and metal complex azo dyes at lower voltage driving (1-5 V) in organic solvents are oxidized azobenzene, not hydrazine, which was found in the electrochemical degradation of dye water solutions. When the ITO electrode is modified by a polyimide (PI) film to a thickness less than 4 μm, the electrochemical degradation of the dye in alcohol solution will not appear in the cyclic volt-ampere curves. A dye electrophoresis in organic solution flexible prototype e-paper display was formed and the display picture is shown.

关键词: electrochemical degradation     electrophoresis     e-paper     oxidized azobenzene group    

Influence of surface modified mixed metal oxide nanoparticles on the electrochemical and mechanical properties

《化学科学与工程前沿(英文)》 2023年 第17卷 第1期   页码 1-14 doi: 10.1007/s11705-022-2176-9

摘要: Newly synthesized functional nanoparticles, 3-amino-1,2,4-triazole (ATA)/SiO2–TiO2 were introduced to the polyurethane (PU) matrix. Electrochemical techniques were used to investigate the barrier properties of the synthesized PU–ATA/SiO2–TiO2 nanocomposite coated steel specimen. In natural seawater, electrochemical impedance spectroscopy experiments indicated outstanding protective behaviour for the PU–ATA/SiO2–TiO2 coated steel. The coating resistance (Rcoat) of PU–ATA/SiO2–TiO2 was determined to be 2956.90 kΩ·cm–2. The Rcoat of the PU–ATA/SiO2–TiO2 nanocomposite coating was found to be over 50% higher than the PU coating. The current measured along the scratched surface of the PU–ATA/SiO2–TiO2 coating was found to be very low (1.65 nA). The enhanced ATA/SiO2–TiO2 nanoparticles inhibited the entry of electrolytes into the coating interface, as revealed by scanning electron microscopy/energy dispersive X-ray spectroscopy and X-ray diffraction analysis of the degradation products. Water contact angle testing validated the hydrophobic nature of the PU–ATA/SiO2–TiO2 coating (θ = 115.4°). When the concentration of ATA/SiO2−TiO2 nanoparticles was 2 wt %, dynamic mechanical analysis revealed better mechanical properties. Therefore, the newly synthesised PU–ATA/SiO2–TiO2 nanocomposite provided excellent barrier and mechanical properties due to the addition of ATA/SiO2–TiO2 nanoparticles to the polyurethane, which inhibited material degradation and aided in the prolongation of the coated steel’s life.

关键词: SiO2/TiO2 nanoparticle     nanocomposite coatings     dynamic mechanical analysis     electrochemical techniques     corrosion     colloids and interfaces    

Newly-modeled graphene-based ternary nanocomposite for the magnetophotocatalytic reduction of CO2 with electrochemical

《化学科学与工程前沿(英文)》 2022年 第16卷 第10期   页码 1438-1459 doi: 10.1007/s11705-022-2166-y

摘要: The development of CO2 into hydrocarbon fuels has emerged as a green method that could help mitigate global warning. The novel structured photocatalyst is a promising material for use in a photocatalytic and magneto-electrochemical method that fosters the reduction of CO2 by suppressing the recombination of electron−hole pairs and effectively transferring the electrons to the surface for the chemical reaction of CO2 reduction. In our study, we have developed a novel-structured AgCuZnS2–graphene–TiO2 to analyze its catalytic activity toward the selective evolution of CO2. The selectivity of each nanocomposite substantially enhanced the activity of the AgCuZnS2–graphene–TiO2 ternary nanocomposite due to the successful interaction, and the selectivity of the final product was improved to a value 3 times higher than that of the pure AgCuZnS2 and 2 times higher than those of AgCuZnS2–graphene and AgCuZnS2–TiO2 under ultra-violet (UV)-light (λ = 254 nm) irradiation in the photocatalytic process. The electrochemical CO2 reduction test was also conducted to analyze the efficacy of the AgCuZnS2–graphene–TiO2 when used as a working electrode in laboratory electrochemical cells. The electrochemical process was conducted under different experimental conditions, such as various scan rates (mV·s–1), under UV-light and with a 0.07 T magnetic-core. The evolution of CO2 substantially improved under UV-light (λ = 254 nm) and with 0.07 T magnetic-core treatment; these improvements were attributed to the facts that the UV-light activated the electron-transfer pathway and the magnetic core controlled the pathway of electron-transmission/prevention to protect it from chaotic electron movement. Among all tested nanocomposites, AgCuZnS2–graphene–TiO2 absorbed the CO2 most strongly and showed the best ability to transfer the electron to reduce the CO2 to methanol. We believe that our newly-modeled ternary nanocomposite opens up new opportunities for the evolution of CO2 to methanol through an electrochemical and photocatalytic process.

关键词: ternary nanocomposite     photocatalytic     electrochemical CO2 reduction     UV-light     magnetic core    

Special issue on electrochemical energy storage and conversion

《能源前沿(英文)》 2024年 第18卷 第2期   页码 125-127 doi: 10.1007/s11708-024-0942-8

摘要: Special issue on electrochemical energy storage and conversion

关键词: conversion    

/cellulose nanofiber composite films with outstanding photothermal effect, excellent mechanical and electrochemical

《化学科学与工程前沿(英文)》 2023年 第17卷 第8期   页码 1028-1037 doi: 10.1007/s11705-022-2251-2

摘要: Electrodes that combine energy storage with mechanical and photothermal performance are necessary for efficient development and use of flexible energy storage and conversion devices. In this study, the flexible, ultrathin, and multifunctional polypyrrole/cellulose nanofiber composite films were fabricated via a one-step “soak and polymerization” method. The dense sandwich structure and strong interfacial interaction endowed polypyrrole/cellulose nanofiber composite films with excellent flexibility, outstanding mechanical strength, and desired toughness. Interestingly, the polypyrrole/cellulose nanofiber composite film electrodes with quaternary amine functionalized cellulose nanofiber had the highest specific mass capacitance (392.90 F∙g–1) and specific areal capacitance (3.32 F∙cm–2) than the electrodes with unmodified and carboxyl functionalized cellulose nanofibers. Further, the polypyrrole/cellulose nanofiber composite films with sandwich structure had excellent photothermal conversion properties. This study demonstrated a feasible and versatile method for preparing of multifunctional composite films, having promising applications in various energy storage fields.

关键词: cellulose nanofiber     electrochemical     photothermal conversion     polypyrrole    

标题 作者 时间 类型 操作

Recent advances in the electrochemical oxidation water treatment: Spotlight on byproduct control

Yang Yang

期刊论文

Integrated energy view of wastewater treatment: A potential of electrochemical biodegradation

期刊论文

Electrocoagulation process for the treatment of metal-plating wastewater: Kinetic modeling and energy

Fatih Ilhan, Kubra Ulucan-Altuntas, Yasar Avsar, Ugur Kurt, Arslan Saral

期刊论文

Recent advances in electrochemical decontamination of perfluorinated compounds from water: a review

期刊论文

厌氧产能生物技术用于城市污水处理的研究进展

李文卫, 俞汉青

期刊论文

Research progress in tribo-electrochemistry and tribo-electrochemical polishing

ZHAI Wenjie

期刊论文

Enhanced electrochemical performance of CoNiS@TiCT electrode material through doping of cobalt element

期刊论文

Effect of denitrifying bacteria on the electrochemical reaction of activated carbon fiber in electrochemical

YING Diwen, JIA Jinping, ZHANG Lehua

期刊论文

Special issue on electrochemical conversion and utilization of hydrogen energy

期刊论文

Emerging electrochemical processes for materials recovery from wastewater: Mechanisms and prospects

Lingchen Kong, Xitong Liu

期刊论文

Investigation of electrochemical degradation and application of e-paper dyes in organic solvents

Luhai LI, Ming WANG, Yi FANG, Shunan QIAO

期刊论文

Influence of surface modified mixed metal oxide nanoparticles on the electrochemical and mechanical properties

期刊论文

Newly-modeled graphene-based ternary nanocomposite for the magnetophotocatalytic reduction of CO2 with electrochemical

期刊论文

Special issue on electrochemical energy storage and conversion

期刊论文

/cellulose nanofiber composite films with outstanding photothermal effect, excellent mechanical and electrochemical

期刊论文