Selective Adsorption Behavior of Sulfuric Acid Oxidized and Doped Conjugated Microporous Poly(aniline)s toward Lead Ions in an Aqueous Environment

Yubing Wang; Xiaoxi Wu; Ziyi Zhou; Jiangtao Feng; Mingtao Li; Jie Chen; Wei Yan

doi:10.1021/acs.langmuir.3c03317

Selective Adsorption Behavior of Sulfuric Acid Oxidized and Doped Conjugated Microporous Poly(aniline)s toward Lead Ions in an Aqueous Environment

Langmuir. 2024 Feb 8. doi: 10.1021/acs.langmuir.3c03317. Online ahead of print.

Authors

Yubing Wang^{1

2}, Xiaoxi Wu^{1

2}, Ziyi Zhou³, Jiangtao Feng¹, Mingtao Li², Jie Chen⁴, Wei Yan^{1

2}

Affiliations

¹ Department of Environmental Science and Engineering, Xi'an Key Laboratory of Solid Waste Recycling and Resource Recovery, Xi'an Jiaotong University, Xi'an 710049, P. R. China.
² State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, P. R. China.
³ Engineering Research Center of Energy Storage Materials and Devices, Ministry of Education, "Four Joint Subjects One Union" School-Enterprise Joint Research Center for Power Battery Recycling & Circulation Utilization Technology, Department of Applied Chemistry, School of Chemistry, Xi'an Jiaotong University, Xi'an 710049, P. R. China.
⁴ College of Chemical Engineering, Fuzhou University, Fuzhou, Fujian 350108, P. R. China.

PMID: 38329721
DOI: 10.1021/acs.langmuir.3c03317

Abstract

The coexistence of lead, zinc, and copper ions in wastewater constitutes an environmental challenge of pressing concern. This research delves into the preparation of innovative oxidation-doped conjugated microporous poly(aniline) frameworks, exploring their prospective efficacy in regulating lead ion adsorption from aqueous solutions. H₂SO₄-CMPTA demonstrates the capability to reach adsorption equilibrium within 15 min at a lead concentration of 50 ppm. Even at a lead concentration of 20 ppm, it still efficaciously attenuates these levels to sub-10 ppb, a value surpassing extant standard. H₂SO₄-CMPTA retains over 78.8% adsorption efficiency after six cycles. Analytical characterization coupled with computational calculations suggests that sulfate-coordinated nitrogen cationic structure plays a crucial role in adsorption. A deeper investigation reveals the cardinal role of electrostatic attraction and exclusive chelation adsorption underpinning the efficient capture of lead ions by doped sulfate ions. Intriguingly, in a mixed heavy metal solution containing lead, zinc, and copper ions, H₂SO₄-CMPTA exhibits an initial predilection toward zinc ions, yet an eventual ion-exchange adsorption gravitating toward lead ions was discerned, governed by the latter's superior binding energy. Our study elucidates a promising material as an efficacious tool for the remediation of aquatic environments tainted with lead contaminants.