Efficient degradation of tetracycline by heterogeneous electro-Fenton process using Cu-doped Fe@Fe2O3: Mechanism and degradation pathway

Environmental contextHydrochlorothiazide, a common diuretic pharmaceutical, occurs in environmental waters because current treatment technologies are unable to eliminate it from wastewater. To remove this environmentally hazardous chemical from water, we developed an advanced electrochemical oxidation process to efficiently degrade and mineralise the compound. Wider application of the process holds the promise of general, efficient destruction of pharmaceuticals in aqueous media. AbstractThe degradation and the mineralisation of the diuretic hydrochlorothiazide were studied by an advanced electrochemical oxidation process, ‘electro-Fenton’, which generates in situ hydroxyl radicals that are able to successfully oxidise or mineralise organic pollutants. In this study, a 0.1mM (29.8mgL−1) hydrochlorothiazide solution was completely oxidatively degraded in 15min under constant current electrolysis at 500 mA. The absolute kinetic rate constant of the oxidation reaction was also determined as (4.37±0.04)×109M−1s−1. The quasi-complete mineralisation of the solution was obtained with electrolysis for 6h under the same applied current. Several oxidation reaction intermediates were identified using gas chromatography-mass spectrometry (GC-MS). The formed carboxylic acids during the mineralisation process were also studied; oxamic, oxalic, acetic and maleic acids were identified and their concentrations were monitored throughout the electrolysis. The ions released during the treatment were also considered. Based on these data and the total organic carbon (TOC) removal results, a possible mineralisation pathway was proposed. These findings enable the conclusion that the electro-Fenton process is an efficient and environmentally-friendly method to eliminate the hazardous drug hydrochlorothiazide from an aqueous environment.

Download Full-text

Degradation of Oxytetracycline by Electrochemical, Fenton and Electro-fenton Processes Using SS316 and SS316/β-PbO2 Anodes: Process Optimization Using Rsm-ccd, Bioassay Test and Degradation Pathway

10.21203/rs.3.rs-448258/v1 ◽

2021 ◽

Author(s):

Kamal Hasani ◽

Sama Hosseini ◽

Heliya Gholizadeh ◽

Abdollah Dargahi ◽

Mehdi Vosoughi

Keyword(s):

Degradation Pathway ◽

Electrochemical Process ◽

Fenton Process ◽

Optimal Conditions ◽

Optimal Value ◽

Anode Electrode ◽

Optimal Values ◽

Electrochemical Fenton ◽

And Staphylococcus Aureus ◽

Central Composite

Abstract The aim of the present study was to evaluate the efficiency of advanced oxidation processes (electrochemical, Fenton and electro-Fenton) in the removal of oxytetracycline using SS316 and SS316/β-PbO2 anodes. This study was performed experimentally on a laboratory scale in a 250 mL reactor. First, experiments were designed for the electrochemical process using a central composite design, and the optimal conditions for the variables pH(3.53), electric current density(3.85mA/cm2), initial concentration of oxytetracycline (20mg/L) and electrolysis time (42.35min) was obtained; then, under these conditions, the efficiency of Fenton process with FeSO4 variable without the presence of electrodes was evaluated, and its optimal value was 0.3 g/L, and then in the presence of optimal values of the above 5 variables, the efficiency of electro-Fenton process with H2O2 changes were investigated and the optimal value of 0.12 was obtained for H2O2. The removal efficiencies of oxytetracycline in electrochemical, Fenton, and electro-Fenton processes were 84.7%, 73.4%, and 98.2%, respectively. Under optimal conditions, the SS316/β-PbO2 anode electrode enhanced the oxytetracycline efficiency by electron-Fenton process to 100%. The results of bioassay with microorganisms showed that the reduction of toxicity of the effluent treated by electro-Fenton process for Pseudomonas aeruginosa and Staphylococcus aureus was 84.5% and 69%, respectively.

Download Full-text

Tracking the degradation pathway of three model aqueous pollutants in a heterogeneous Fenton process

Journal of Environmental Chemical Engineering ◽

10.1016/j.jece.2019.102987 ◽

2019 ◽

Vol 7 (2) ◽

pp. 102987 ◽

Cited By ~ 2

Author(s):

Mélanie Cohen ◽

Nassira Ferroudj ◽

Audrey Combes ◽

Valérie Pichon ◽

Sébastien Abramson

Keyword(s):

Degradation Pathway ◽

Fenton Process ◽

Heterogeneous Fenton

Download Full-text

Degradation of diazinon from aqueous solutions by electro-Fenton process: effect of operating parameters, intermediate identification, degradation pathway, and optimization using response surface methodology (RSM)

Separation Science and Technology ◽

10.1080/01496395.2020.1821060 ◽

2020 ◽

pp. 1-13

Author(s):

Maryam heidari ◽

Mehdi Vosoughi ◽

Hadi Sadeghi ◽

Abdollah Dargahi ◽

S. Ahmad Mokhtari

Keyword(s):

Response Surface Methodology ◽

Aqueous Solutions ◽

Response Surface ◽

Degradation Pathway ◽

Operating Parameters ◽

Fenton Process

Download Full-text

Treatment of tetrahydrofuran wastewater by the Fenton process: response surface methodology as an optimization tool

Water Science & Technology ◽

10.2166/wst.2014.017 ◽

2014 ◽

Vol 69 (5) ◽

pp. 1080-1087 ◽

Cited By ~ 4

Author(s):

Xianzhong Cao ◽

Huiqing Lou ◽

Wei Wei ◽

Lijuan Zhu

Keyword(s):

Reaction Time ◽

Response Surface ◽

Removal Efficiency ◽

Oxygen Demand ◽

Treatment Method ◽

Degradation Pathway ◽

Fenton Process ◽

Operating Variables ◽

Rsm Optimization ◽

Initial Ph

In this study, the Box-Benkhen design and response surface method (RSM) were applied to evaluate and optimize the operating variables during the treatment of tetrahydrofuran (THF) wastewater by Fenton process. The four factors investigated were initial pH, Fe2+ dosage, H2O2 dosage and reaction time. Statistical analysis showed the linear coefficients of the four factors and the interactive coefficients such as initial pH/Fe2+ dosage, initial pH/H2O2 dosage and Fe2+ dosage/H2O2 dosage all significantly affected the removal efficiency. The RSM optimization results demonstrated that the chemical oxygen demand (COD) removal efficiency could reach up to 47.8% when initial pH was 4.49, Fe2+ dosage was 2.52 mM, H2O2 dosage was 20 mM and reaction time was 110.3 min. Simultaneously, the biodegradability increased obviously after the treatment. The main intermediates of 2-hydroxytetrahydrofuran, γ-butyrolactone and 4-hydroxybutanoate were separated and identified and then a simple degradation pathway of THF was proposed. This work indicated that the Fenton process was an efficient and feasible pre-treatment method for THF wastewater.

Download Full-text

Transformation products and degradation pathway of textile industry wastewater pollutants in Electro-Fenton process

Chemosphere ◽

10.1016/j.chemosphere.2018.05.114 ◽

2018 ◽

Vol 207 ◽

pp. 690-698 ◽

Cited By ~ 16

Author(s):

Parminder Kaur ◽

Jai Prakash Kushwaha ◽

Vikas Kumar Sangal

Keyword(s):

Textile Industry ◽

Transformation Products ◽

Degradation Pathway ◽

Fenton Process ◽

Wastewater Pollutants ◽

Industry Wastewater

Download Full-text

Effect of anionic surfactants on the process of Fenton degradation of methyl orange

Water Science & Technology ◽

10.2166/wst.2009.483 ◽

2009 ◽

Vol 60 (11) ◽

pp. 2803-2807 ◽

Cited By ~ 3

Author(s):

C. W. Yang ◽

D. Wang

Keyword(s):

Methyl Orange ◽

Anionic Surfactants ◽

Sodium Dodecyl ◽

Degradation Pathway ◽

Fenton Process ◽

Methyl Orange Degradation ◽

First Order ◽

Kinetics Modelling ◽

Kinetics Of ◽

Sds Surfactant

Fenton process has been shown to be very successful to remove dyes from water. However, the influence of other constituents in dyeing industry wastewater, such as Sodium Dodecyl Sulphate (SDS) surfactants, has not been investigated. In this study, the effect of SDS surfactant on the kinetics of Methyl Orange degradation undergoing Fenton process was investigated. Results show that Methyl Orange degradation rate decreased as SDS concentration increased, which was attributed to the consumption of hydroxyl radicals (∙OH) by surfactants and the formation of Methyl Orange-SDS complex. No evidence was found that the Methyl Orange degradation pathway was affected by the presence of SDS. The kinetics modelling indicates the reaction was the first-order reaction to Methyl Orange.

Download Full-text