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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/50489

    Title: Performance of phosphoric acid activated montmorillonite as buffer materials for radioactive waste repository
    Authors: Wang,TH;Liu,TY;Wu,DC;Li,MH;Chen,JR;Teng,SP
    Contributors: 水文與海洋科學研究所
    Date: 2010
    Issue Date: 2012-03-27 17:33:20 (UTC+8)
    Publisher: 國立中央大學
    Abstract: In this study, the performance of phosphoric acid activated montmorillonite (PAmmt) was evaluated by cesium ions adsorption experiments. The PAmmt samples were obtained by activating with 1, 3 and 5 mol L(-1) of phosphoric acid, respectively under reflux for 3, 12, and 24 h. Experimental results demonstrated that the treatment of raw K-10 montmorillonite with phosphoric acid increased the materials' affinity for Cs uptake and no significant amount of suspension solids were produced. A relatively insignificant variation in the CEC value was observed. Furthermore, PAmmt also showed high adsorption selectivity toward Cs ions. The improved sorptive properties were mainly related to the increased surface area and the relatively higher surface charge density. Increased specific surface area was the resulted from partial decomposition of lamellar structure of mmt: while the higher surface charge density was caused by the protonation of octahedral Al-OH sites during the acid activation. Generally speaking, stronger acid concentration and longer activation times would produce relatively more decomposed PAmmt particles. However, as the activation exceeds 3 h, the precipitation of Si(4+) would passivate PAmmt against further acid attacks. Based upon our results, acid activation by phosphoric acid could produce PAmmt samples with high sorption capacity and selectivity, and good structural integrity, which are beneficial to be used at radioactive waste repository. Crown Copyright (C) 2009 Published by Elsevier B.V. All rights reserved.
    Appears in Collections:[水文與海洋科學研究所] 期刊論文

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