Alkynyl functionalized MoS2 mesoporous materials with superb adsorptivity for heavy metal ions

Yingying Wang; Hui Xu; Xiaomin Zhao; Hong Meng; Yingzhou Lu; Chunxi Li

doi:10.1016/j.jhazmat.2021.127579

Alkynyl functionalized MoS₂ mesoporous materials with superb adsorptivity for heavy metal ions

J Hazard Mater. 2022 Feb 15;424(Pt C):127579. doi: 10.1016/j.jhazmat.2021.127579. Epub 2021 Oct 22.

Authors

Yingying Wang¹, Hui Xu¹, Xiaomin Zhao¹, Hong Meng¹, Yingzhou Lu², Chunxi Li³

Affiliations

¹ State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, PR China; College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, PR China.
² College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, PR China.
³ State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, PR China; College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, PR China; Beijing Key Laboratory of Energy Environmental Catalysis, Beijing University of Chemical Technology, Beijing 100029, PR China. Electronic address: licx@mail.buct.edu.cn.

PMID: 34736210
DOI: 10.1016/j.jhazmat.2021.127579

Abstract

Effective elimination of heavy metal ions from water is an arduous task for their toxic effects to aquatic ecosystem and human health. Herein, a novel alkynyl functionalized molybdenum disulfide (C-MoS₂) is fabricated via mechanochemical method with well interlayered spacing, meso porosity, and high surface area (~211 m²g^-1). Mineral MoS₂ was first peeled mechanically and oxidized in situ to MoS_2-xO_x, and then reduced by ball milling with CaC₂ to form the C-MoS₂ composite. The as-obtained C-MoS₂ shows extraordinary adsorptivity for heavy metal ions, viz. 1194 mg-Hg g^-1 (Hg(NO₃)₂ solution, pH= 5, 303.15 K, equilibrium Hg(II) concentration Ce= 36.9 μg·g^-1, ionic strength I= 17.2 mmolL^-1), and 442.3 mg-Pbg^-1 (Pb(NO₃)₂ solution, pH= 5, 303.15 K, equilibrium Pb(II) concentration Ce= 46.9μgg^-1, I= 5.8 mmolL^-1), respectively, along with excellent recyclability, representing one of the best sorbents till now. The adsorption isotherms of Hg(II) followed the Langmuir model and the adsorption kinetics followed the pseudo-second-order model. The adsorption is an endothermic and entropy driven spontaneous process. The excellent adsorption performance of C-MoS₂ is attributed to its very high S-content, availability, and soft acid-base interaction with mercury and lead anions. The C-MoS₂ is an advanced sorbent for Hg(II) and Pb(II) with excellent adsorption performance and recyclability.

Keywords: Adsorption; Calcium carbide; Heavy metal; Mechanical chemistry; Molybdenum disulfide.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Adsorption
Ecosystem
Humans
Hydrogen-Ion Concentration
Ions
Kinetics
Molybdenum*
Water Pollutants, Chemical* / analysis

Substances

Ions
Water Pollutants, Chemical
Molybdenum