Determination of point of zero charge and acid—base superficial coal groups in water

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	Determination of point of zero charge and acid—base superficial coal groups in water
	Tayssir Hamieha and Bernard Siffert
发表期刊	Colloids and Surfaces
	1991
卷号	61 页码:83-96
中文摘要	Adsorption isotherms of protons (NH) and hydroxyl ions (NOH) of different water-dispersed coals, as a function of pH were determined by potentiometry. The points of zero charge (p.z.c.) for the various coals were given: these p.z.c are located between pH 3.4 (for washed Menouna coal) and pH 9.5 (Chemviron coal)The acid and base surface groups of the different coals were dosed using Boehm's method. The results permitted calculation of the acidity (Ka) and basicity (Kb) constants of the different coals and therefore the free energy variations ΔG°a and ΔG°b of acid—base surface dissociation. The p.z.c of the different coals displayed a linear dependency with ΔG°a and ΔG°b, which themselves exhibit a linear dependency versus the (SiO2/Al2O3) molar ratio of coal impurities. The effect of these impurities on the surface charge was once again demonstrated..
语种	英语
文献类型	期刊论文
条目标识符	http://ir.yic.ac.cn/handle/133337/4489
专题	科研共享资源
推荐引用方式 GB/T 7714	Tayssir Hamieha and Bernard Siffert. Determination of point of zero charge and acid—base superficial coal groups in water[J]. Colloids and Surfaces,1991,61:83-96.
APA	Tayssir Hamieha and Bernard Siffert.(1991).Determination of point of zero charge and acid—base superficial coal groups in water.Colloids and Surfaces,61,83-96.
MLA	Tayssir Hamieha and Bernard Siffert."Determination of point of zero charge and acid—base superficial coal groups in water".Colloids and Surfaces 61(1991):83-96.

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