In this study, we developed a simple and sensitive colorimetric sensing method for the detection of UO, which was built to release MB from the molybdenum disulfide with a phosphate group (MoS-PO) gated mesoporous silica nanoparticles functionalized phosphate group (MSN-PO) with UO chelating. In the presence of UO, MoS-PO can be effectively adsorbed onto the surface of MSN-PO based on the coordination chemistry for strong affinity between the P-O bond and UO. The adsorbed MoS-PO was then utilized as an ideal gate material to control the release of signal molecules (MB) entrapped within the pores of MSN-PO, resulting in a detectable decrease in the absorption peak at 663 nm. This colorimetric sensing demonstrated the advantages of simplicity and easy manipulation and exhibited a linear response to the concentration of UO within the range of 0.02-0.2 μM. The detection limit of UO was determined to be 0.85 nM, which was lower than the limit (130 nmol L) set by the US Environmental Protection Agency. Furthermore, the proposed colorimetric sensing method has been utilized to determine UO in samples of Xiangjiang River and tap water, and a high recovery rate was achieved. This method shows promising potential in preventing and controlling environmental pollution.
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