Ti/IrO2/SnO2 anode for electrochemical degradation of chlorpyrifos in water: optimization and degradation performances

7th International Conference on Key Engineering Materials

材料科学;工业技术

Pathiraja, G.C.^1,2 ; Wijesingha, M.S.^3 ; Nanayakkara, N.^2,4

Department of Engineering Technology, Faculty of Technology, University of Ruhuna, Matara, Sri Lanka^1

Environmental Engineering/Electrochemistry Research Group, Institute of Fundamental Studies, Hantana Road, Kandy, Sri Lanka^2

National Centre for Non Destructive Testing, Sri Lanka Atomic Energy Board, Kelaniya, Sri Lanka^3

Department of Civil Engineering, Faculty of Engineering, University of Peradeniya, Sri Lanka^4

关键词: Coating concentration;    Electrochemical degradation;    Electrochemically active surface areas;    Open circuit potential;    Organophosphate pesticides;    Response surface methodology;    Scanning electron microscopic;    Two level factorial designs;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/201/1/012040/pdf
DOI  :  10.1088/1757-899X/201/1/012040

来源: IOP

【 摘 要 】

Chlorpyrifos, a widely used organophosphate pesticide which can be found in surface water bodies, is harmful for human body. Thus, treating water contaminated with chlorpyrifos is important. In our previous studies, novel Ti/IrO2-SnO2anode was successfully developed for electrochemical degradation of chlorpyrifos in chloride free water. In this study, optimization of previously developed Ti/IrO2-SnO2anode for mineralization of chlorpyrifos was successfully performed through response surface methodology. During the optimization study, two-level factorial design was used to determine the optimal coating solutions concentration for developing the Ti/IrO2-SnO2anode. Cyclic voltammetry and open circuit potential were performed to investigate the electrochemically active surface area and stability of these anodes. The response surface and contour plots show that 0.3 M of [Ir] and 7.5 mM of [Sn] coated electrode has both highest anodic charge and stability. Scanning Electron Microscopic (SEM) images show the evidence of having both compact and porous regions in the surface of the thin film, resulting larger surface area. Within 6 h, the best result for mineralization (55.56%) of chlorpyrifos was obtained with 0.3 M of [Ir] and 7.5 mM of [Sn] coated anode using Total organic Carbon (TOC) analyzer. Therefore, the optimum coating concentration was found as 0.3 M of [Ir] and 7.5 mM of [Sn]. It would require an energy consumption of 6 kWhm-3.