Efficient Removal of Strontium from Simulated Radioactive Wastewater by Using Mechanically Modified Dolomite as a Novel Environment-friendly Adsorbent
With similar biochemical properties to calcium, strontium including radioactive 90Sr ( T1/2 = 28.1 year ) and stable isotope 88Sr, 87Sr, 86Sr and 84Sr can be easily enriched in human body’s bones to cause bone cancer, hematopoietic dysfunction and other diseases for natural decay releasing β-rays. So 90Sr removal from radioactive wastewater is necessary from the stances of both human health and environmental protection. To enhance the removal and separation efficiency of Sr ions from simulated radioactive wastewater, we proposed the use of dolomite mineral as environment-friendly absorbent with the aid of ball milling. Due to the easier dissolution of Mg ions after the modification to offer more chance for Sr ions precipitated onto dolomite structure and the remaining Ca carbonate part inside would work as nucleus seeds for easier growth of Sr carbonate crystals as well as the formation of (Sr, Ca)CO3 solid state solution. Furthermore, the widely available dolomite minerals even with some impurities (gangue minerals) worked in even better performance for Sr removal and offered a low-cost absorbent (without the need to purify dolomite) as another advantage.