Bifunctional collagen fiber/carbon quantum dot fluorescent adsorbent for efficient adsorption and detection of Pb2+

作者：Jing, Limin; Ding, Qijun^*; Li, Xia; Lou, Jiang; Liu, Zhuqing; Jiang, Yifei; Han, Wenjia; Cheng, Zheng

来源：Science of the Total Environment, 2023, 871: 161989.

DOI：10.1016/j.scitotenv.2023.161989

• Fluorescent aerogel
• Efficient detection and removal
• Pb2+
• Collagen fiber
• Carbon dots

In this work, fluorescent adsorbents that can efficiently detect and remove Pb2+ were developed by integrating the designed amino-modified carbon quantum dots and carboxyl-modified collagen. The adsorption properties of the fluo-rescent adsorbent were further optimized and analyzed using a series of response surface experiments. The maximum adsorption concentration for Pb2+ was 183 mg.g-1. The adsorption isotherms fit well with the Langmuir model, and the adsorption kinetics fit with the pseudo-second-order model. The emission intensity of the fluorescent adsorbent gradually decreased with the increase of the concentration of Pb2+, and had a good linear correlation. In addition, the mechanism of detection and removal of Pb2+ by fluorescent adsorbents was further demonstrated. The novel three-dimensional structured fluorescent aerogel can be used as a promising adsorbent with good adsorption concen-tration and sensing ability for Pb2+, which shows great prospects in wastewater.