期刊
INORGANICA CHIMICA ACTA
卷 526, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.ica.2021.120540
关键词
Colorimetry; Lead-acid battery; Chemometrics; Metal-organic frameworks; H2S sensor
资金
- CNPq [401541/2016-9, 306132/2017-6, 164652/2017-5]
- FACEPE [164652/2017-5, APQ-0549-1.06/17/INCT 2014, IBPG-0197-1.06/19, BFP-0110-1.06/19]
- CAPES
- FINEP
In this study, a one-pot electrochemical method was developed for recycling lead electrodes to prepare a metal-organic framework, which was used for quantifying hydrogen sulfide with colorimetric techniques showing greater sensitivity.
Spent lead-acid batteries are environment emerging contaminants and very harmful to health. In this work, we developed one-pot electrochemical method of recycling lead electrodes for the preparation of Pb metal-organic framework, using 1,3,5-benzenetricarboxylic acid as organic ligand (Pb(btc)-1). In H2S solution, a color change can be observed on the Pb(btc)-1 surface, which is caused by PbS formation and, therefore, it was studied as a smart compound for H2S quantification. Colorimetric techniques, as diffuse reflectance and digital image (DI) analysis obtained on a smartphone, were used for H2S quantification. The grayscale and RGB color histograms were obtained from the recorded images and treated by partial least squares (PLS) regression method directly on a smartphone, or using the MATLAB (R) software. The colorimetric techniques showed greater sensitivity, resulting in a limit of detection of 0.11 mmol.L-1, which is slightly lower than the DI using MATLAB (R) software (0.21 mmol.L-1). The accuracies of the colorimetric techniques were similar and present feasible values when compared to Horwitz criteria. Thus, the H2S sensor ends the lead-acid battery recycling cycle, giving a colorimetric device by a low energy processing of the lead electrode.
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