Silica alcogels for possible nuclear waste confinement - A simulated study

被引：6

作者：

Aravind, P. R. ^{[1
]}

Sithara, L. ^{[1
]}

Mukundan, P. ^{[1
]}

Pillai, P. Krishna ^{[1
]}

Warrier, K. G. K. ^{[1
]}

机构：

[1] CSIR, Reg Res Lab, Mat & Minerals Div, Trivandrum 19, Kerala, India

来源：

MATERIALS LETTERS | 2007年 / 61卷 / 11-12期

关键词：

nuclear waste fixation; glasses; sol-gel preparation; nuclear wastes;

D O I：

10.1016/j.matlet.2006.09.022

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A new method for possible incorporation of nuclear wastes has been attempted here by using silica alcogels as a host precursor for confinement. The large pore volume of the silica alcogel is used as a sponge to incorporate chemical species. Neodymium nitrate is used as a simulant for high level waste. The alcogels have been immersed in 5, 10, 20 and 30% neodymium nitrate solution and the resulting alcogels are dried under controlled conditions at 70 degrees C. The bulk density of the gels increases on absorption of neodymium nitrate. The BET analysis shows a decrease in surface area and total pore volume as the percentage of neodymium nitrate is increased. On sintering the gels at 1200 degrees C neodymium was confined which was confirmed by negative leachability. The percentage of loading has been found out by calculating the difference in weight of the neodymium incorporated gel before and after incorporation of neodymium. XRD studies of the sintered samples reveal the formation of neodymium silicates. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：2398 / 2401

页数：4

共 18 条

[1]

Adelhelm C., 1988, Radioactive waste forms for the future, P393

[2] IMMOBILIZATION OF SIMULATED HIGH-LEVEL WASTE IN SINTERED GLASSES [J].

AUDERO, MA ;

BEVILACQUA, AM ;

DEBERNASCONI, NBM ;

RUSSO, DO ;

STERBA, ME .

JOURNAL OF NUCLEAR MATERIALS, 1995, 223 (02) :151-156

[3]

Boatner L. A., 1988, Radioactive waste forms for the future, P495

[4] PORE STRUCTURE EVOLUTION IN SILICA-GEL DURING AGING DRYING .3. EFFECTS OF SURFACE-TENSION [J].

DESHPANDE, R ;

HUA, DW ;

SMITH, DM ;

BRINKER, CJ .

JOURNAL OF NON-CRYSTALLINE SOLIDS, 1992, 144 (01) :32-44

[5]

Ewing R. C., 1988, Radioactive waste forms for the future, P589

[6]

Ewing R. C., 1995, Progress in Nuclear Energy, V29, P63, DOI 10.1016/0149-1970(94)00016-Y

[7]

Hayward P. J., 1988, Radioactive waste forms for the future, P427

[8] GROWTH AND STRUCTURE OF SINGLE-PHASE MULLITE GELS FROM CHELATED ALUMINUM ALKOXIDES AND ALKOXYSILANES [J].

HEINRICH, T ;

RAETHER, F ;

MARSMANN, H .

JOURNAL OF NON-CRYSTALLINE SOLIDS, 1994, 168 (1-2) :14-22

[9]

JIANG W, 1993, SCI BASIS NUCL WA 16, V294, P255

[10]

Kumar SR, 1998, POLYHEDRON, V17, P1699

← 1 2 →