A Ca 2+ MOF combining highly efficient sorption and capability for voltammetric determination of heavy metal ions in aqueous media
[4];
[5];
[5];
[2];
[1]
- Laboratory of Inorganic Chemistry, Department of Chemistry, University of Ioannina, 45110 Ioannina, Greece
- Laboratory of Inorganic Chemistry, Department of Chemistry, National and Kapodistrian University of Athens, Zografou, Greece
- Department of Chemistry, University of Cyprus, 1678 Nicosia, Cyprus
- Department of Physics and Science of Advanced Materials Program, Central Michigan University, Mt. Pleasant, USA
- Laboratory of Analytical Chemistry, Department of Chemistry, National and Kapodistrian University of Athens, Zografou, Greece
We recently discovered that a Ca2+ two-dimensional framework, namely [Ca(H4L)(DMA)2]·2DMA (Ca-MOF), was capable of exchanging the Ca2+ ions with Cu2+ almost quantitatively in a matter of seconds in aqueous solution. Herein, we report that Ca-MOF exhibits the capability of both removal and voltammetric determination of heavy metal ions in aqueous media. Ca-MOF shows one of the highest Pb2+ sorption capacities (~522 mg g-1) reported for MOFs. More importantly, a column filled with Ca-MOF (1% wt) particles dispersed in silica sand (99% wt) can quantitatively remove traces of Pb2+ (~100 ppb) from a relatively large volume of a wastewater simulant solution (containing a large excess of competitive ions). Ca-MOF is also highly efficient for sorption of Cd2+, Ni2+ and Zn2+, even in the presence of several competitive cations. Actually, the Cd2+ sorption capacity (~220 mg g-1) of Ca-MOF is one of the largest reported for MOFs. Furthermore, detailed Ni2+ and Zn2+ sorption studies of MOFs have not been described prior to this work. The mechanism of the M2+ (M2+ = Pb2+, Cd2+, Ni2+, Zn2+) exchange process was elucidated based on a series of spectroscopic, analytical and X-ray diffraction methods. In addition, a simple ready-to-use electrochemical sensor based on modified graphite paste with Ca-MOF was fabricated and successfully utilized for the determination of Pb2+, Cd2+, Cu2+ and Zn2+ at μg L-1 levels in aqueous solutions by anodic stripping voltammetry (ASV). Overall, this work demonstrates, for the first time, a dual function of a MOF as a sorbent and as an electrochemical sensor for heavy metal ions, thus opening a new window for materials with application in both environmental remediation and monitoring.
- Research Organization:
- Central Michigan Univ., Mount Pleasant, MI (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- Grant/Contract Number:
- SC0006877
- OSTI ID:
- 1570517
- Alternate ID(s):
- OSTI ID: 1525902; OSTI ID: 1610908
- Journal Information:
- Journal of Materials Chemistry. A, Journal Name: Journal of Materials Chemistry. A Vol. 7 Journal Issue: 25; ISSN 2050-7488
- Publisher:
- Royal Society of Chemistry (RSC)Copyright Statement
- Country of Publication:
- United Kingdom
- Language:
- English
Web of Science
Similar Records
Highly efficient and selective adsorption of In{sup 3+} on pristine Zn/Al layered double hydroxide (Zn/Al-LDH) from aqueous solutions
Removal of lead from aqueous solutions by Penicillium biomass