4.7 Article

Selective adsorption towards heavy metal ions on the green synthesized polythiophene/MnO2 with a synergetic effect

期刊

JOURNAL OF CLEANER PRODUCTION
卷 338, 期 -, 页码 -

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2022.130536

关键词

Heavy metal ion; Selective adsorption; PTh/MnO2; Design principle and mechanism; Synergetic effect

资金

  1. National Natural Science Foundation of China [22108040, 51978569, 21878054]
  2. Key Program of Qingyuan Innovation Laboratory [00221004]
  3. Natural Science Foundation of Fujian Province [2020J05130]
  4. Science and Technology Project of Fujian Educational Committee [JAT190051]
  5. Research Initiation Funding of Fuzhou University [GXRC-19051]

向作者/读者索取更多资源

In this study, we developed a green synthetic strategy to obtain a polythiophene (PTh)/MnO2 composite with high selectivity for heavy metal adsorption. By adjusting the core-shell structure and core MnO2, the composite exhibited efficient adsorption of heavy metal ions. Through experiments and calculations, it was found that this selectivity was due to the synergetic self-doping nature between PTh and MnO2, allowing for robust recycling of the composite in the environment.
Selective adsorption towards heavy metals from the industrial wastewater is of great value. Here, we developed a green synthetic strategy to acquire a polythiophene (PTh)/MnO2 composite in the aqueous medium. The produced core-shell composite, which featured abundant sulfurs and hydroxyls, provided a platform for the effective heavy metal ion capture, resulting in a rapid adsorption equilibrium within 30 min, and in novel adsorption capacities of 82.10, 30.72 and 60.79 mg g(-1) for Pb2+, Zn2+ and Cu2+, respectively. It also showed developable selectivity towards these heavy metal ions, which could be tuned by the core MnO2 , with a competition factor order of P(1.22, Ph2+)similar to P(1.02, Zn2+)>> P(0.508, Cu2+). We showed that, through experiments, characterizations and DFT calculation, this selectivity resulted from its synergetic self-doping nature between PTh and MnO2, by which the PTh would protect hydroxyls from being associated with H+ before adsorption, enabling hydroxyls catch heavy metals in a much efficient and selective manner. Moreover, this self-doping nature allowed our composite to be robustly recycled for more than five cycles through a simply acid-base treatment. The provided design principle for the task-specific adsorbent herein would contribute to address challenges concerning heavy metal selective capture in the environmental field.

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