Utilization of a new optical sensor unit to monitor the electrochemical elimination of selected dyes in water

1st International Conference on Advances in Environmental Engineering

生态环境科学

Valica, M.^1 ; erná, T.^1 ; Hostin, S.^1

Department of Ecochemistry and Radioecology, Faculty of Natural Sciences, University of SS. Cyril and Methodius in Trnava, Nám. J. Herdu 2, Trnava

SK-917 01, Slovakia^1

关键词: Analytical validation;    Electrochemical treatments;    In- situ monitoring;    LED light source;    Multi-wavelengths;    NaCl concentration;    Source management;    Strong correlation;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/92/1/012070/pdf
DOI  :  10.1088/1755-1315/92/1/012070

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

This paper presents results obtained by developed optical sensor, which consist from multi-wavelength LED light source and two photodetectors capable of measuring the change in optical signal along two different optical paths (absorbance and reflectance measurements). Arduino microcomputer was used for light source management and optical signal data measuring and recording. Analytical validation of developed optical sensor is presented in this paper. The performance of the system has been tested with varying water solution of dyes (malachite green, methyl orange, trypan red). These results show strong correlations between the optical signal response and colour change from the dyes. Sensor was used for continual in-situ monitoring of electrochemical elimination of selected dyes (current density 15.7 mA cm-2, electrolyte volume 4 L and NaCl concentration 2 g L-1). Maximum decolorization level varies with each dye. For malachite green was obtain 92,7 % decolorization (25 min); methyl orange 90,8% (8,5 min) and trypan red 84,7% decolorization after 33 min of electrochemical treatment.