![](/image/logo.gif) |
English
|
正體中文
|
简体中文
|
全文筆數/總筆數 : 78937/78937 (100%)
造訪人次 : 39151327
線上人數 : 840
|
|
|
資料載入中.....
|
請使用永久網址來引用或連結此文件:
http://ir.lib.ncu.edu.tw/handle/987654321/50489
|
題名: | Performance of phosphoric acid activated montmorillonite as buffer materials for radioactive waste repository |
作者: | Wang,TH;Liu,TY;Wu,DC;Li,MH;Chen,JR;Teng,SP |
貢獻者: | 水文與海洋科學研究所 |
日期: | 2010 |
上傳時間: | 2012-03-27 17:33:20 (UTC+8) |
出版者: | 國立中央大學 |
摘要: | 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. |
關聯: | JOURNAL OF HAZARDOUS MATERIALS |
顯示於類別: | [水文與海洋科學研究所] 期刊論文
|
文件中的檔案:
檔案 |
描述 |
大小 | 格式 | 瀏覽次數 |
index.html | | 0Kb | HTML | 848 | 檢視/開啟 |
|
在NCUIR中所有的資料項目都受到原著作權保護.
|
::: Copyright National Central University. | 國立中央大學圖書館版權所有 | 收藏本站 | 設為首頁 | 最佳瀏覽畫面: 1024*768 | 建站日期:8-24-2009 :::