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Remarkable Acid Stability of Polypyrrole‐MoS 4 : A Highly Selective and Efficient Scavenger of Heavy Metals Over a Wide pH Range
Author(s) -
Xie Linxia,
Yu Zihuan,
Islam Saiful M.,
Shi Keren,
Cheng Yahan,
Yuan Mengwei,
Zhao Jing,
Sun Genban,
Li Huifeng,
Ma Shulan,
Kanatzidis Mercouri G.
Publication year - 2018
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201800502
Subject(s) - polypyrrole , sorbent , metal , adsorption , materials science , metal ions in aqueous solution , nuclear chemistry , environmental remediation , inorganic chemistry , chemistry , polymerization , contamination , organic chemistry , metallurgy , polymer , ecology , composite material , biology
The new material polypyrrole/MoS 4 2− (MoS 4 ‐Ppy), prepared by ion‐exchange of NO 3 ‐ of NO 3 ‐Ppy with MoS 4 2− , displays high acid stability and excellent uptake for heavy metal ions such as Hg 2+ , Ag + , Cu 2+ , and Pb 2+ . The different maximum adsorption capacities ( q m ) for Cu 2+ , Pb 2+ , Hg 2+ , and Ag + depend on the various binding modes arising from the different thiophilicity of these metal ions. The removals of Ag + and Pb 2+ reach >99.6% within 5 min, and for highly toxic Hg 2+ , >98% removal achieves at 1 min. At strong acid limit, the exceptional q m (Ag + ) of 725 mg g −1 places the MoS 4 ‐Ppy at the top of materials for such removal. Uptake kinetics of Ag + , Hg 2+ , and Pb 2+ is extremely fast: >99.9% removal rates at wide pH range (0.5–6) within 1–5 min. Also, at strongly acidic conditions (pH ≈ 1), for highly toxic Hg 2+ , <2 ppb concentration can be achieved, accepted as safe limit. The MoS 4 ‐Ppy demonstrates an outstanding ability to separate low‐concentrated Ag + from high concentrated Cu 2+ especially under strong acidic conditions (pH ≈ 1), showing a large separation factor SF Ag/Cu ( K d Ag / K d Cu ) of 10 5 (>100). MoS 4 ‐Ppy is a superior and novel sorbent material for water remediation applications as well as precious metals recovery.