Hydroxyapatite Extracted From Fishbone On Uranium (?) Sorption From Aqueous Solution

With the development of nuclear industry, more and more attention has been paid to the high efficiency and better selective or separation method of uranium from mining resources and waste aqueous water for the reasons listed below: Firstly, uranium is the main fuel for develop nuclear energy,hardly can be take the place of raw material for nuclear. Secondly, uranium is one of the heavy metals with radioactivity and chemical toxicity. Either natural process or anthropogenic activities may results in the uranium pollution in groundwater and surface water. Thus, the dispose and enrichment of uranium are really important for both reasonable use of uranium resources from our fragile environment and human health protection.In this research, the sorbent was used for removal of uranium(VI) from aqueous solution. Before it can be used as a sorbent, we pretreated kitchen waste fishbone to extracted hydroxyapatite. Batch experiments have been conducted to study the effects of initial solution pH, contact time, and initial uranium concentration on uranium sorption.The maximum uranium sorption capacity onto the sorbent was estimated to be 383.24 mg /g, while the calculated saturated adsorption capacity from Freundlich isotherm was 400 mg/g under the determined optimal experimental conditions. The kinetics of uranium(VI) sorption onto the sorbent was 80 min, and the sorption process was conducted to follow pseudo-second-order kinetic model. The optimum pH was found as 3. The sorption isotherm was successfully modeled by the Freundlich isotherm. The final product precipitation of uranyl ions is autunite, which can be really stabilize for a long time.This research hoped to afford basic data for assessing the feasibility of the sorbent applied in the enrichment or stabilize of uranium from waste water. The experimental results demonstrated that the the sorbent could be used as a candidate adsorbent for extracting uranium from aqueous solution.