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

Limin Jing; Qijun Ding; Xia Li; Jiang Lou; Zhuqing Liu; Yifei Jiang; Wenjia Han; Zheng Cheng

doi:10.1016/j.scitotenv.2023.161989

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

Sci Total Environ. 2023 May 1:871:161989. doi: 10.1016/j.scitotenv.2023.161989. Epub 2023 Feb 6.

Authors

Limin Jing¹, Qijun Ding², Xia Li¹, Jiang Lou¹, Zhuqing Liu¹, Yifei Jiang¹, Wenjia Han¹, Zheng Cheng³

Affiliations

¹ State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences, Jinan 250353, China.
² State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences, Jinan 250353, China. Electronic address: xianshengding@qlu.edu.cn.
³ State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences, Jinan 250353, China; State Key Laboratory of Pulp and Paper Engineering, Plant Fiber Material Science Research Center, School of Light Industry and Engineering, South China University of Technology, Guangzhou 510640, China.

PMID: 36754317
DOI: 10.1016/j.scitotenv.2023.161989

Abstract

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 fluorescent 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 concentration and sensing ability for Pb²⁺, which shows great prospects in wastewater.

Keywords: Carbon dots; Collagen fiber; Efficient detection and removal; Fluorescent aerogel; Pb(2+).