Experimental Study on the Basic Characteristics of a Novel Silica-Based CMPO Adsorbent

In order to establish the extraction chromatography process for recovery of minor actinides from HLLW with a novel silicabased CMPO (octyl (phenyl)-N, N-diisobutylcarbamoylmethylphosphine oxide) adsorbent, some basic characteristics, such as dissolving behavior of CMPO from the adsorbent, thermal decomposition of the adsorbent and treatment method of organic wastes, were examined. It was found that the leakage of CMPO from the adsorbent in contact with an aqueous solution is the result of the solubility of CMPO in the solution. About 40-50ppm of CMPO constantly leaked into the effluent from the adsorbent packed column using 0.01M (M=mol/dm3) HNO3 as a mobile phase. The leakage of CMPO from the adsorbent could be effectively depressed with the utilization of the aqueous solution saturated by CMPO. TG-DTA thermal analysis results indicate that CMPO in the adsorbent decomposed at 200°C and the SDB-polymer at 290°C. The impregnated CMPO could be completely dissolved out from the support with acetone. Furthermore, the organic wastes such as CMPO, oxalic acid and DTPA those come from the elution procedure could be effectively decomposed with the Fenton reagent.