We demonstrated an efficient recovery of lithium ions (Li + ) from seawater using a continuous flow column packed with an adsorbent, chitosan−lithium manganese oxide (LMO). The effects of Li + concentration, contact time, and recyclability were investigated. The adsorbent showed good removal efficiency of Li + from seawater. The maximum adsorption capacity was calculated to be 54.65 mg/ g. The adsorption process fit well with the Freundlich isotherm with a correlation coefficient of 0.9924. Kinetics studies showed that the adsorption process was consistent with the pseudo-second-order model. The recyclability was tested after extraction of Li + from the adsorbent using sulfuric acid. The adsorption capacity decreased slightly after recycling the adsorbent three times. This may be due to the dissolution of Mn 2+ and deformation of the chitosan structure. A study of the selectivity of Li + in seawater showed that the selectivity increased in the order Li + > Mg 2+ > Na + .
In this study, a simple one-step hydrothermal reaction is developed to prepare composite based on Prussian blue (PB)/reduced graphene oxide foam (RGOF) for efficient removal of radioactive cesium (137Cs) from contaminated water. Scanning electron microscopy and transmission electron microscopy show that cubic PB nanoparticles are decorated on the RGO surface. Owing to the combined benefits of RGOF and PB, the composite shows excellent removal efficiency (99.5%) of 137Cs from the contaminated water. The maximum adsorption capacity is calculated to be 18.67 mg/g. An adsorption isotherm fit-well the Langmuir model with a linear regression correlation value of 0.97. This type of composite is believed to hold great promise for the clean-up of 137Cs from contaminated water around nuclear plants and/or after nuclear accidents.
Gamma-ray mediated synthesis of ultra-low dense porous 3D-network structured PB@PVP/rGO aerogel with high mechanical stability for the removal of Cs+ ions, methylene blue and n-hexadecane.
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