Graphene oxide-based materials for efficient removal of heavy metal ions from aqueous solution: A review.

With the development of nuclear energy, large amounts of radionuclides are inevitably released into the natural environment. It is necessary to eliminate radionuclides from wastewater for the protection of environment. Nanomaterials have been considered as the potential candidates for the effective and selective removal of radionuclides from aqueous solutions under complicated conditions because of their high specific surface area, large amounts of binding sites, abundant functional groups, pore-size controllable and easily surface modification. This review mainly summarized the recent studies for the synthesis, fabrication and surface modification of novel nanomaterials and their applications in the efficient elimination and solidification of radionuclides, and discussed the interaction mechanisms from batch experiments, spectroscopy analysis and theoretical calculations. The sorption capacities with other materials, advantages and disadvantages of different nanomaterials are compared, and at last the perspective of the novel nanomaterials is summarized.

Synthesis of novel nanomaterials and their application in efficient removal of radionuclides

Graphene nanosheets as novel adsorbents in adsorption, preconcentration and removal of gases, organic compounds and metal ions.

Graphene-based materials: Fabrication and application for adsorption in analytical chemistry ☆

https://rke.abertay.ac.uk/ws/files/8551791/Morales_FiltrationAndTransportOfHeavyMetalsInGrapheneOxideEnabledSandColumns_Author_2014.pdf

Filtration and transport of heavy metals in graphene oxide enabled sand columns

The removal of Th4+ ions from aqueous solutions was investigated using single-layer graphene oxide (GO) as a sorbent which was prepared by the modified Hummers’ method through batch adsorption experiments at room temperature. Structural characterizations of the sorbent were also investigated. The influences of the pH value of solution, contact time, sorbent dose, ionic strength, the initial metal ion concentration and temperature on the adsorption of Th4+ were also investigated. These results indicated that the adsorption of Th4+ was dependent on the pH and independent on the ionic strength. The sorbent provided significant Th4+ removal (>98.7 %) at pH 3.0 and the adsorption equilibrium was achieved after only 10 min. The Langmuir adsorption isotherm fit the absorption profile very closely, and indicated that a maximum adsorption capacity of 1.77 mmol g−1 of GO (411 mg g−1) after 2 h. The thermodynamic parameters showed that this adsorption process was endothermic and spontaneous. Moreover, the desorption level of Th4+ from GO, by using 0.1 mol L−1 H2SO4 as a stripping agent, was 84.2 ± 1.2 %, and that of 0.5 mol L−1 HNO3 as a stripping agent, was 79.8 ± 3.0 %.

Ting He

Papers

Removal of Th4+ ions from aqueous solutions by graphene oxide