Heavy metals are seriously hazardous contaminants and drinking water has been identified as an important route of human exposure to them. Herein, to efficiently and selectively remove trace heavy metal ions, a facile method was reported to achieve the slow polymerization of dopamine in the cages of MIL-100 (Fe) via ultrasonic treatment followed by the hydrolysis of the urea. X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), Brunner-Emmet-Teller (BET) and pore size distribution determination confirmed the formation of the polydopamine (PDA) and binding with the unsaturated Fe³⁺ site in MIL-100 (Fe) pores. The composite not only retained pore structure of MOFs but also contained abundant reactive functional groups. When initial lead concentration was 150 ppb and 20 ppm calcium coexisted at pH of 6.5 ± 0.25, the effluent lead concentration met the safe drinking water standard in several tens of seconds, and decreased to 1.13 ppb in 10 min. The adsorption rate reached 99.35%. The synthetic strategy effectively overcomes mass transfer resistance of trace heavy metal ions and provides a facile approach to prepare adsorption materials for efficient and selective removal of trace heavy metal ions from drinking water.

重金属是严重的有害污染物，饮用水已被确定为人类接触重金属的重要途径。在本文中，为了有效和选择性地除去痕量重金属离子，据报道一种简便的方法通过超声处理随后水解尿素来实现MIL-100（Fe）笼中多巴胺的缓慢聚合。X射线衍射（XRD），场发射扫描电子显微镜（FE-SEM），X射线光电子能谱（XPS），傅里叶变换红外光谱（FTIR），Brunner-Emmet-Teller（BET）和孔径分布确定聚多巴胺（PDA）的形成并与不饱和Fe ³⁺结合在MIL-100（Fe）毛孔中定位。该复合物不仅保留了MOF的孔结构，而且还包含丰富的反应性官能团。当初始铅浓度为150 ppb和20 ppm钙在6.5±0.25的pH下共存时，废水中的铅浓度在几十秒内达到安全饮用水标准，并在10分钟内降至1.13 ppb。吸附率达到99.35％。该合成策略有效地克服了痕量重金属离子的传质阻力，并提供了一种简便的方法来制备吸附材料，以从饮用水中有效和选择性地去除痕量重金属离子。