scholarly journals Improved electrochemical oxidative degradation of Reactive Red 24 dye by BDD anodes coupled with nitrate: operating parameters, kinetics, and degradation pathways

2021 ◽  
Author(s):  
Yining Tang ◽  
Deliang He ◽  
Yanni Guo ◽  
Jun Shang ◽  
Lei Zhou ◽  
...  
Keyword(s):  
Treatment Process ◽  
Oxidative Degradation ◽  
Active Species ◽  
Operating Parameters ◽  
Degradation Pathways ◽  
Contribution Rate ◽  
Optimal Operating ◽  
Bdd Anode ◽  
Decolorization Efficiency ◽  
Bdd Anodes

Abstract The electrochemical oxidation (EO) process coupled with BDD anode and nitrate was used to improve Reactive Red 24 (RR24) removal efficiency in wastewater treatment. The effects of operating parameters on the decolorization efficiency of RR24 were discussed, and the optimal operating parameters were obtained as follows: 45 mA cm− 2, 100 mM SO42−, 7 mM NO3−, 60°C, pH 5.88, and 100 mg L− 1 RR24 initial concentration. The energy consumption for 100% decolorization within 15 min is 0.92 kWh m− 3, and the total organic carbon (TOC) reaches 51.35% within 90 min. Through the effect of quenchers on RR24 decolorization efficiency, various active species in the EO process were studied. It was found that •OH was closely related to the decolorization degradation of RR24, reaching a contribution rate of 99.47%. Finally, we propose the degradation pathways of RR24 by UV-Vis spectrum and LC-MS test. In summary, the proposed treatment process could be applied to treat RR24 dyes as an efficient method.

Oxidative degradation of atenolol by heat-activated persulfate: Kinetics, degradation pathways and distribution of transformation intermediates

Chemosphere ◽  
2018 ◽  
Vol 207 ◽  
pp. 174-182 ◽  
Author(s):  
Dong Miao ◽  
Jianbiao Peng ◽  
Xiaohuan Zhou ◽  
Li Qian ◽  
Mengjie Wang ◽  
...  
Keyword(s):  
Oxidative Degradation ◽  
Degradation Pathways ◽  
Activated Persulfate

Combinative dyebath treatment with activated carbon and UV/H2O2: a case study on Everzol Black-GSP®

2002 ◽  
Vol 46 (4-5) ◽  
pp. 51-58 ◽  
Author(s):  
N.H. Ince ◽  
D.A. Hasan ◽  
B. Üstün ◽  
G. Tezcanli
Keyword(s):  
Hydrogen Peroxide ◽  
Activated Carbon ◽  
Carbon Mineralization ◽  
Oxidative Degradation ◽  
Advanced Oxidation ◽  
Color Removal ◽  
Operating Parameters ◽  
Cost Reductions ◽  
H2o2 System

Treatability of textile dyebath effluents by two simultaneously operated processes comprising adsorption and advanced oxidation was investigated using a reactive dyestuff, Everzol Black-GSP® (EBG). The method was comprised of contacting aqueous solutions of the dye with hydrogen peroxide and granules of activated carbon (GAC) during irradiation of the reactor with ultraviolet light (UV). Control experiments were run separately with each individual process (advanced oxidation with UV/H2O2 and adsorption on GAC) to select the operating parameters on the basis of maximum color removal. The effectiveness of the combined scheme was tested by monitoring the rate of decolorization and the degree of carbon mineralization in effluent samples. It was found that in a combined medium of advanced oxidation and adsorption, color was principally removed by oxidative degradation, while adsorption contributed to the longer process of dye mineralization. Economic evaluation of the system based on total color removal and 50% mineralization showed that in the case of Everzol Black-GSP®, which adsorbs relatively poorly on GAC, the proposed combination provides 25% and 35% reduction in hydrogen peroxide and energy consumption relative to the UV/H2O2 system. Higher cost reductions are expected in cases with well adsorbing dyes and/or with less costly adsorbents.

scholarly journals Hydrolytic and oxidative degradation of electrospun supramolecular biomaterials: In vitro degradation pathways

2015 ◽  
Vol 27 ◽  
pp. 21-31 ◽  
Author(s):  
M.C.P. Brugmans ◽  
S.H.M. Sӧntjens ◽  
M.A.J. Cox ◽  
A. Nandakumar ◽  
A.W. Bosman ◽  
...  
Keyword(s):  
Oxidative Degradation ◽  
Degradation Pathways ◽  
In Vitro Degradation

scholarly journals Activation of the Normal Human Skin Cells by a Portable Dielectric Barrier Discharge-Based Reaction-Discharge System of a Defined Gas Temperature

2019 ◽  
Vol 40 (1) ◽  
pp. 79-97 ◽  
Author(s):  
Anna Dzimitrowicz ◽  
Aleksandra Bielawska-Pohl ◽  
Piotr Jamroz ◽  
Jerzy Dora ◽  
Agnieszka Krawczenko ◽  
...  
Keyword(s):  
Wound Healing ◽  
Human Skin ◽  
Chronic Wounds ◽  
Barrier Discharge ◽  
Operating Conditions ◽  
Operating Parameters ◽  
Gas Temperature ◽  
Optimal Operating ◽  
Discharge System ◽  
Dielectric Barrier

Abstract Skin injury leading to chronic wounds is of high interest due to the increasing number of patients suffering from this symptom. Proliferation, migration, and angiogenesis are key factors in the wound healing processes. For that reason, controlled promotion of these processes is required. In this work, we present the portable helium-dielectric barrier discharge (He-DBD)-based reaction-discharge system of controlled gas temperature for biological activities. To make this He-DBD-based reaction-discharge system safe for biological purposes, a multivariate optimization of the operating parameters was performed. To evaluate the effect of the He-DBD operating parameters on the rotational gas temperature Trot(OH), a design of experiment followed by a Response Surface Methodology was applied. Based on the suggested statistical model, the optimal operating conditions under which the Trot(OH) is less than 37 °C (310 K) were estimated. Then, the resulted model was validated in order to confirm its accuracy. After estimation the optical operating conditions of He-DBD operation, the spectroscopic characteristic of the He-DBD-based reaction-discharge system in relevance to the several optical temperatures in addition to electron number density has been carried out. Additionally, the qualitative and quantitative analyses of the reactive oxygen species and reactive nitrogen species were performed in order to investigate of reactions and processes running in the He-DBD-gaseous phase and in the He-DBD-treated liquid. Next, the developed portable He-DBD-based reaction-discharge system, working under the optimal operating conditions, was used to stimulate the wound healing process. It was found that a 30 s He-DBD treatment significantly increased the proliferation, migration, and angiogenesis of keratinocytes (HaCaT) and fibroblasts (MSU-1.1) cell lines, as well as human skin microvascular endothelial cells (HSkMEC.2). Hence, the application of the cold atmospheric pressure plasma generated in this He-DBD-based reaction-discharge system might be an alternative therapy for patient suffering from chronic wounds.

Sign in / Sign up

Export Citation Format

Share Document