Abstract
Exploitation of algal biochar is a profitable opportunity for the utilization of filamentous green algae due to its sustainable growth and ease of harvest. In this study, Rhizoclonium-derived biochar (CB) and δ-MnO2-modified biochar (MnO2/CB) were fabricated for uranium (U(VI)) removal. The results showed that the δ-MnO2 modification increased the BET surface area and decreased the isoelectric point. The maximum sorption amount of U(VI) by the MnO2/CB reached up to 100.2 mg/g (pH = 6.0, 289 K, and 0.01 M NaCl), which was two times higher than that of the CB. After five consecutive sorption/desorption cycles, the affinity of the MnO2/CB for U(VI) maintained in 94.8%. According to the analysis of X-ray photoelectron spectroscopy, it confirmed that the U(VI) sorption was mainly ascribed to the surface complexation between U(VI) and oxygen-containing functional groups on the surface of the MnO2/CB. Therefore, this investigation not only encourages the development of algal biochar derived from the filamentous green algae but also provides a novel adsorbent for U(VI) removal from aqueous solutions.
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