Uranium, in terms of both its radioactivity and chemical toxicity, poses significant environmental and health risks when released through nuclear industry activities and its mining. The sensitive detection of uranyl ions (UO(2)(2+)) in wastewater is crucial for mitigating these risks and safeguarding public health. Herein, we present an innovative approach by synthesizing the functional monomer 6-(3-(2-(methacryloyloxy)ethyl)ureido)picolinate (K6MUPA) to create a novel europium ion (Eu(3+))-K6MUPA-AAm hydrogel sensor. Through simple ionic coordination, europium ions (Eu(3+)) were incorporated ...