Uptake of aqueous heavy metal ions (Co2+, Cu2+ and Zn2+) by calcium-aluminium-silicate-hydrate gels

被引：58

作者：

Baldermann, Andre ^{[1
]}

Preissegger, Veronika ^{[2
]}

Simic, Sanja ^{[3
,4
]}

Letofsky-Papst, Ilse ^{[3
,4
]}

Mittermayr, Florian ^{[5
]}

Dietzel, Martin ^{[1
]}

机构：

[1] Graz Univ Technol, Inst Appl Geosci, NAWI Graz, Rechbauerstr 12, A-8010 Graz, Austria

[2] Mjp Ziviltechniker GmbH, Burostandort Oberalm, Halleiner Landesstr 84, A-5411 Oberalm, Austria

[3] Graz Univ Technol, Inst Electron Microscopy & Nanoanal, NAWI Graz, Steyrergasse 17, A-8010 Graz, Austria

[4] Graz Univ Technol, Graz Ctr Electron Microscopy ZFE, NAWI Graz, Steyrergasse 17, A-8010 Graz, Austria

[5] Graz Univ Technol, Inst Technol & Testing Bldg Mat, Inffeldgasse 24, A-8010 Graz, Austria

来源：

CEMENT AND CONCRETE RESEARCH | 2021年 / 147卷

关键词：

C-A-S-H phase; Environment; Pollution; Heavy metals; crystal chemistry; C-S-H; MSWI FLY-ASH; NUCLEAR-MAGNETIC-RESONANCE; PORTLAND-CEMENT; OYSTER SHELLS; IMMOBILIZATION; CONCRETE; SOLIDIFICATION; STABILIZATION; MECHANISMS;

D O I：

10.1016/j.cemconres.2021.106521

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Calcium-aluminium-silicate-hydrate (C-A-S-H) gels containing heavy metal ions (Me: Co2+, Cu2+ or Zn2+) were precipitated at different Me/Si molar ratios to study the uptake mechanism and immobilization capacity. Aqueous solution chemistry and solid-phase characterization using XRD, FTIR, ESEM-EDX, TEM-HAADF and TGDSC methods reveal threshold values for ion substitution of -55-60 mol% for Zn, -30-40 mol% for Co and -25-30 mol% for Cu in defective tobermorite-type C-A-S-H with (Ca + Me)/(Si + Al) molar ratios from 0.86 to 1.04. At higher aqueous Me concentrations, Me (chloride) hydroxides start to co-precipitate. The uptake mechanism of Me ions by C-A-S-H is based on (i) isomorphous substitution of Me for Ca in the CaO layer, (ii) ion exchange in the interlayer, (iii) tetrahedral substitution (Zn) within the dreierketten chains and (iv) surface adsorption onto the C-A-S-H gel structure. Systematics in crystal-chemistry of Me-bearing C-A-S-H and implications for application and performance in natural and man-made settings are discussed.

引用

页数：14

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