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[1]陆国森,邓敏,莫立武,等.C-S-H凝胶对K+和Na+的吸附作用[J].南京工业大学学报(自然科学版),2017,39(01):31-38.[doi:10.3969/j.issn.1671-7627.2017.01.006]
 LU Guosen,DENG Min,MO Liwu,et al.Adsorption of K+ and Na+ by C-S-H gel[J].Journal of NANJING TECH UNIVERSITY(NATURAL SCIENCE EDITION),2017,39(01):31-38.[doi:10.3969/j.issn.1671-7627.2017.01.006]
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C-S-H凝胶对K+和Na+的吸附作用()
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《南京工业大学学报(自然科学版)》[ISSN:1671-7627/CN:32-1670/N]

卷:
39
期数:
2017年01期
页码:
31-38
栏目:
出版日期:
2017-01-21

文章信息/Info

Title:
Adsorption of K+ and Na+ by C-S-H gel
文章编号:
1671-7627(2017)01-0031-08
作者:
陆国森邓敏莫立武黄蓓
南京工业大学 材料科学与工程学院 材料化学工程国家重点实验室,江苏 南京 210009
Author(s):
LU GuosenDENG MinMO LiwuHUANG Bei
State Key Laboratory of Materials-Oriented Chemical Engineering, College of Materials Science and Engineering,Nanjing Tech University,Nanjing 210009,China
关键词:
C-S-H凝胶 K+和Na+ 吸附 脱附
Keywords:
C-S-H gel K+ and Na+ adsorption desorption
分类号:
TQ172
DOI:
10.3969/j.issn.1671-7627.2017.01.006
文献标志码:
A
摘要:
为了探讨水化硅酸钙(C-S-H)凝胶对K+和Na+的吸附性能,采用3CaO·SiO2(C3S)和纳米SiO2制备了不同钙硅物质的量之比(Ca/Si比)的C-S-H凝胶,着重研究浸泡溶液浓度和不同Ca/Si比C-S-H凝胶固体试样加入量对K+和Na+吸附能力的影响以及吸附态的K+和Na+的解吸行为。结果表明:C-S-H凝胶对K+和Na+的吸附能力随着Ca/Si比的降低而增高; 对于相同Ca/Si比的C-S-H凝胶,随着浸泡溶液浓度的增大,K+和Na+吸附量逐渐增大,随着固体试样用量的增加,K+和Na+的吸附量降低而吸附率增高。C-S-H凝胶对K+和Na+的吸附不仅与其比表面积有关,而且与溶液中Ca2+浓度(浸泡溶液的pH值有关)有关。在溶液低pH值或高Ca2+浓度体系中,K+和Na+的吸附会被溶液中高浓度Ca2+所抑制。脱附实验证实了在碱溶液浓度<0.5 mol/L时,K+和Na+在C-S-H凝胶上吸附是可逆的。
Abstract:
To investigate adsorption of K+ and Na+ by calcium silicate hydrate(C-S-H)gel,C-S-H gels with different n(Ca)/n(Si)were prepared by hydration of 3CaO·SiO2(C3S)incorporated with different substitution levels of nano-SiO2.Effects of alkali solution concentration and solid content on the K+ and Na+ adsorption were studied.Results showed that adsorption capacity of K+ and Na+ increased with the decrease of n(Ca)/n(Si)ratio.For a given n(Ca)/n(Si),with the alkali solution concentration and solid content increased,the adsorption capacity of K+ and Na+increased,while the K+ and Na+adsorption content by C-S-H gel decreased with the increase of solid content.K+ and Na+ adsorption capacity of C-S-H gel was affected not only by the specific surface area,but also by the concentration of Ca2+changed by pH value of the solution.At high Ca/Si ratio or low pH value,alkali adsorption was suppressed by higher Ca2+ concentration.Desorption test demonstrated that adsorption of K+ and Na+ on C-S-H gel was reversible,when the alkali solution concentration was lower than 0.5 mol/L.

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相似文献/References:

[1]魏风艳,吕忆农,兰祥辉,等.低Ca/Si比的C-S-H凝胶产物在抑制AAR中的作用[J].南京工业大学学报(自然科学版),2004,26(04):98.[doi:10.3969/j.issn.1671-7627.2004.04.024]
[2]杨南如.C-S-H凝胶结构模型研究新进展[J].南京工业大学学报(自然科学版),1998,20(02):78.
 Yang Nanru Department of Materials Science and Engineering,Nanjing University of Chemical Technology,Nanjing0009,et al.PROGRESS IN THE INVESTIGATION OF STRUCTURAL MODEL OF C S H GEL[J].Journal of NANJING TECH UNIVERSITY(NATURAL SCIENCE EDITION),1998,20(01):78.

备注/Memo

备注/Memo:
收稿日期:2015-11-22
基金项目:江苏高校优势学科建设工程; 长江学者和创新团队发展计划(IRT1146)
作者简介:陆国森(1988—),男,江苏盐城人,博士,主要研究方向为水泥混凝土; 邓敏(联系人),教授,E-mail: dengmin@njtech.edu.cn.
引用本文:陆国森,邓敏,莫立武,等.C-S-H凝胶对K+和Na+的吸附作用[J].南京工业大学学报(自然科学版),2017,39(1):31-38..
更新日期/Last Update: 2017-01-15