Efficient Removal of Heavy Metals from Polluted Water with High Selectivity for Mercury(II) by 2-Imino-4-thiobiuret–Partially Reduced Graphene Oxide (IT-PRGO)

• DOI: 10.1021/acsami.7b10021
• Publication Date: 2017-09-07T19:58:42Z
• Authors: Fathi S. Awad; Khaled M. AbouZeid; Weam M. Abou El-M...; Ahmad M. El-Wakil; M. Samy El-Shall
• Keywords: Mercury

A novel chelating adsorbent, based on the chemical modification of graphene oxide by functionalization amidinothiourea to form 2-imino-4-thiobiuret-partially reduced (IT-PRGO), is used for effective extraction toxic metal ions Hg(II), Cu(II), Pb(II), Cr(VI), and As(V) from wastewater. FTIR Raman spectroscopy, XRD, XPS confirm successful incorporation groups within partially GO nanosheets through nucleophilic substitution reactions with acyl chloride in chemically modified GO. The IT-PRGO adsorbent shows exceptional selectivity Hg(II) a capacity 624 mg/g, placing it among top carbon-based materials known high removal aqueous solutions. maximum sorption capacities As(V), Pb(II) are 19.0, 37.0, 63.0, 101.5 respectively. displays 100% at concentrations up 100 ppm 90%, 95%, 15, 30, 90 min, respectively, 50 concentration. In mixture six heavy containing 10 each ion, 3% Zn(II), 4% Ni(II), 9% Cd(II), 21% 63% Hg(II). monolayer adsorption behavior suggested excellent agreement experimental isotherms Langmuir model. kinetics can be fitted well pseudo-second-order kinetic model which suggests chemisorption mechanism via grafted nanosheets. Desorption studies demonstrate that easily regenerated desorption reaching 96%, 100%, their using different eluents. proposed as performing remediation metals waste polluted water.