Flow-through electrochemical removal of benzotriazole by electroactive ceramic membrane

Wang, Shengli; Pei, Shuzhao; Zhang, Jinna; Huang, Junqiang; You, Shijie

doi:10.1016/j.watres.2022.118454

Cited by 35 publications

(11 citation statements)

References 67 publications

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“…Wang et al reported that flow direction could trigger the change of acid or alkali boundary layer at electrode/electrolyte interface. 51 In this study, although the H* yield was not affected by interfacial pH, 16 CA flow presented severe inhibition on O 2 concentration on the cathode by nearly 1 order of magnitude (Figure 2d,e). This was consistent with enhanced ORR rate and O 2 utilization by enhancing O 2 mass transfer at the three-phase interface.…”

Section: ■ Introductionmentioning

confidence: 51%

“…Then, we investigated the impact of anode materials, i.e., commercially available DSA with low OEP (∼1.5 V vs SHE) and TiSO with high OEP (∼2.3 V vs SHE). , At an anode potential of 1.7 V vs SHE, the water flow-driven process based on DSA (0.049 min –1 ) and CFF anode (0.044 min –1 ) exhibited comparable 2,4-DCP removal (Figure S14), both of which were much higher than that for the TiSO anode (0.013 min –1 ). This was attributed to sufficient supply of the O 2 by low-OEP anodes (DSA and CFF), indicating the significant role of the supply of O 2 in H*-mediated MOA.…”

Section: Resultsmentioning

confidence: 99%

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Water Flow-Driven Coupling Process of Anodic Oxygen Evolution and Cathodic Oxygen Activation for Water Decontamination and Prevention of Chlorinated Byproducts

Wei,

Pei,

et al. 2023

Environ. Sci. Technol.

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Electrochemical advanced oxidation process (EAOP) is a promising technology for decentralized water decontamination but is subject to parasitic anodic oxygen evolution and formation of toxic chlorinated byproducts in the presence of Cl − . To address this issue, we developed a novel electrolytic process by water flow-driven coupling of anodic oxygen evolution reaction (OER) and cathodic molecular oxygen activation (MOA). When water flows from anode to cathode, O 2 produced from OER is carried by water through convection, followed by being activated by atomic hydrogen (H*) on Pd cathode to produce • OH. The water flow-driven OER/MOA process enables the anode to be polarized at low potential (1.7 V vs SHE) that is lower than that of conventional EAOP whose • OH is produced from direct water oxidation (>2.3 V vs SHE). At a flow rate of 30 mL min −1 , the process could achieve 94.8% removal of 2,4-dichlorophenol (2,4-DCP) and 71.5% removal of chemical oxygen demand (COD) within 45 min at an anode potential of 1.7 V vs SHE and cathode potential of −0.5 V vs SHE. To achieve the comparable 2,4-DCP removal performance, 4.3-fold higher energy consumption was needed for the conventional EAOP with titanium suboxide anode (anode potential of 2.9 V vs SHE), but current efficiency declined by 3.5 folds. Unlike conventional EAOP, chlorate and perchlorate were not detected in the OER/MOA process, because low anode potential <2.0 V vs SHE was thermodynamically unfavorable for the formation of chlorinated byproducts by anodic oxidation, indicated by theoretical calculations and experimental data. This study provides a proof-in-concept demonstration of water flow-driven OER/MOA process, representing a paradigm shift of electrochemical technology for water decontamination and prevention of chlorinated byproducts, making electrochemical water decontamination more efficient, more economic, and more sustainable.

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Section: ■ Introductionmentioning

confidence: 51%

Section: Resultsmentioning

confidence: 99%

Water Flow-Driven Coupling Process of Anodic Oxygen Evolution and Cathodic Oxygen Activation for Water Decontamination and Prevention of Chlorinated Byproducts

Wei,

Pei,

et al. 2023

Environ. Sci. Technol.

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“…This study determined COD, TN, and ammonia by dichromate, alkaline potassium persulfate, and Nessler reagent spectrophotometry, respectively. 43 Metal ions were detected using an inductively coupled plasma mass spectrometer (ICP-MS, AGILENT 730, Germany). The surface microstructure of the ceramic membrane materials before and after loading with CNTs was examined using scanning electron microscopy (SEM, Gemini 300, Carl Zeiss, Germany).…”

Section: Analytical Methods and Characterizationmentioning

confidence: 99%

The efficient treatment of pickling wastewater using a self-assembled in situ polymerized ceramic membrane with graphene/carbon nanotubes/polypyrrole

Wang

Zhang

Zong

et al. 2023

Environ. Sci.: Water Res. Technol.

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“…Increasing oxygen vacancy (OV) concentration has been demonstrated to be an effective strategy for promoting ROS production in the electrocatalytic process, − because it can decrease charge transfer resistance and provide sufficient electrocatalytic active sites. For example, TiO x EM mainly consisting of TiO 1.75 (Ti 4 O 7 ) has abundant oxygen vacancies and exhibits outstanding performance in the electrocatalytic membrane filtration process for removing various contaminants. − Moreover, the contaminant removal ability of a TiO x EM is greatly influenced by oxygen vacancy concentration, because it is crucial to ROS production. ,, Under the nanoconfinement of membrane pores, the effect of oxygen vacancies on ROS production will be further amplified . However, the intrinsic correlation between oxygen vacancies and the generation and transformation of ROS in membrane pores has not been systematically and thoroughly studied, and it is of vital importance to achieve highly selective ROS production and to maximize the decontamination efficiency of MO x EM.…”

Section: Introductionmentioning

confidence: 99%

Titanium Oxide Electrocatalytic Membrane Filtration: “Two Faces” of Oxygen Vacancies in Generation and Transformation of Reactive Oxygen Species

Sun,

Lu,

Zhang

et al. 2023

Environ. Sci. Technol.

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Oxygen vacancies are crucial to the production of reactive oxygen species (ROS) in the metal oxide electrocatalytic membrane (MO x EM) process. Here, using cathodic TiO x EM as a model, we thoroughly reveal the roles of oxygen vacancies in ROS generation and transformation. Oxygen vacancies significantly promote H 2 O 2 and • OH production at low concentrations (increment <35%) but inhibit their production at high concentrations (increment >35%). Electrochemical analysis discloses that the enhancement of ROS production profits from the acceleration of charge transfer kinetics by both bulk and surface oxygen vacancies, whereas we attribute the decline in ROS production to the strong adsorption of ROS by surface oxygen vacancies. It is strongly supported by theoretical calculations that reveal the promoted adsorption of *OOH and *OH by oxygen vacancies, which intensifies the capture and scavenging of H 2 O 2 and • OH. Moreover, the gradual increase of interaction time between ROS and oxygen vacancies (from ∼1 to ∼5 s) notably reduces the generation and transformation efficiency of ROS, further highlighting the detrimental impact of oxygen vacancies. In summary, oxygen vacancies show "two faces" toward ROS generation and transformation, acting as ROS promoters at low concentrations but inhibitors at high concentrations. A medium oxygen vacancy concentration is preferred for ROS production, thus causing impressive pollutant removal (>95% removal of bisphenol A within 1.2−1.5 s at 360−440 LMH). This study provides guidance on regulating ROS generation and transformation by manipulating the oxygen vacancy concentration to enhance the decontamination efficiency of MO x EMs.

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Flow-through electrochemical removal of benzotriazole by electroactive ceramic membrane

Cited by 35 publications

References 67 publications

Water Flow-Driven Coupling Process of Anodic Oxygen Evolution and Cathodic Oxygen Activation for Water Decontamination and Prevention of Chlorinated Byproducts

Water Flow-Driven Coupling Process of Anodic Oxygen Evolution and Cathodic Oxygen Activation for Water Decontamination and Prevention of Chlorinated Byproducts

The efficient treatment of pickling wastewater using a self-assembled in situ polymerized ceramic membrane with graphene/carbon nanotubes/polypyrrole

Titanium Oxide Electrocatalytic Membrane Filtration: “Two Faces” of Oxygen Vacancies in Generation and Transformation of Reactive Oxygen Species

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