Gypsum overgrowths passivate calcite to acid attack

被引：70

作者：

Booth, J

Hong, Q

Compton, RG

Prout, K

Payne, RM

机构：

[1] UNIV OXFORD,PHYS & THEORET CHEM LAB,OXFORD OX1 3QZ,ENGLAND

[2] UNIV OXFORD,INORGAN CHEM LAB,OXFORD OX1 3QR,ENGLAND

[3] ZENECA PHARMACEUT,MACCLESFIELD SK10 2NA,CHESHIRE,ENGLAND

来源：

JOURNAL OF COLLOID AND INTERFACE SCIENCE | 1997年 / 192卷 / 01期

关键词：

calcite dissolution; gypsum crystallization; atomic force microscopy; channel flow cell; calcium carbonate; calcium sulfate;

D O I：

10.1006/jcis.1997.4978

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The dissolution of calcite (CaCO3) in aqueous solution at pH below ca, 5-6 is known to proceed via the direct reaction of protons at the solid surface. However, exposure of the mineral to sulfuric acid is shown to lead to the rapid formation of an overlayer of calcium sulfate (gypsum) which completely passivates the surface against further reaction and dissolution. The overlayer is nucleated instantaneously on CaCO, surfaces, Scanning electron and atomic force microscopy show that strongly adherent overgrowths are encouraged by a lattice matching between the cleavage (211) plane of calcite and the (010) plane of CaSO4 . 2H(2)O. (C) 1997 Academic Press.

引用

页码：207 / 214

页数：8

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