In this communication, we propose a new paper-based platform functionalized with methylene blue (MB) for the detection and removal of titanium dioxide nanoparticles (TiO2 NPs). Our design took advantage of color changes of the functional paper due to the photocatalytic effect of TiO2 on MB. The paper-based colorimetric sensor displayed a good sensitivity for TiO2, showing great potential for practical applications.
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