化学
铅酸蓄电池
检出限
硫化氢
比色法
RGB颜色模型
电极
电化学
偏最小二乘回归
硫酸
硫化钠
酚酞
电池(电)
无机化学
色谱法
有机化学
硫黄
物理化学
功率(物理)
物理
数学
操作系统
统计
量子力学
计算机科学
作者
Brenand A. S. Souza,Felipe L. N. Sousa,Danilo Oliveira,Licarion Pinto,Denilson V. Freitas,Marcelo Navarro
标识
DOI:10.1016/j.ica.2021.120540
摘要
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® 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® 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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