Because of its strong electron-withdrawing ability, TNP is difficult to degrade into nontoxic substances.1,15 Because TNP has the shortcomings of high water solubility, high toxicity, and poor biodegradability, it has been listed in the forefront of pollutants.16 Hence, it is very important and urgent to develop a highly sensitive and selective method to detect TNP at trace levels in the environment.14,17