Enthalpy of surface reactions: temperature dependency of pH of acidic or basic concentrated hematite suspension

被引：7

作者：

Preocanin, T ^{[1
]}

Krehula, S ^{[1
]}

Kallay, N ^{[1
]}

机构：

[1] Univ Zagreb, Fac Sci, Phys Chem Lab, HR-10001 Zagreb, Croatia

来源：

APPLIED SURFACE SCIENCE | 2002年 / 196卷 / 1-4期

关键词：

hematite; enthalpy; mass titration; point of zero charge; surface reactions; temperature dependency;

D O I：

10.1016/S0169-4332(02)00077-6

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：

Temperature dependency of pH of concentrated metal oxide suspension, containing acid or base, was used as a method for determination of total enthalpy of surface reactions. This enthalpy depends on pH due to electrostatic interactions. It is sum of standard (chemical) part and electrostatic contribution. Difference in standard reaction enthalpies of deprotonation and protonation of neutral surface sites for aqueous hematite dispersion was obtained as Delta(dp)Hdegrees = 42.8 kJ mol(-1) while electrostatic contribution decreases with pH, being zero at the point of zero charge (PZC). (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：392 / 400

页数：9

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