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Effect of Tiron adsorption on the colloidal stability of nano-sized alumina suspension

机译:Tiron吸附对纳米氧化铝悬浮液胶体稳定性的影响

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The colloidal stabilization of nano-sized alumina suspensions with 1,2-dihydroxy-3,5-benzenedisulfonic acid disodium salt (Tiron) at various pH is examined systematically to understand the primary mechanism of dispersion. Zeta potential measurements show that the addition of Tiron causes the isoelectric point from 8.2 to 4.5, as well as a dramatic increase in the absolute zeta potential. The adsorption studies indicate that adsorption saturation increases with the decrease in pH value. The surface properties of alumina suspensions are examined by using FT-IR analysis. In acidic medium, the electrostatic mechanism is found to be the primary mechanism governing dispersion. Under alkaline conditions, chemical interactions take place at the solid-water interface by forming an inner sphere complex between Al3+ ion and Tiron. The suspension stability is characterized by measuring the viscosity, sedimentation height and the effective diameter of particles. It is found that the optimum pH value is 8.5 and the optimal dosage of Tiron is 0.8 dmb% (dry mass base percent) of alumina. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 21]
机译:系统地研究了在各种pH下用1,2-二羟基-3,5-苯二磺酸二钠盐(Tiron)对纳米级氧化铝悬浮液的胶体稳定性,以了解分散的主要机理。 Zeta电势测量表明,添加Tiron会导致等电点从8.2到4.5,并且绝对zeta电势会急剧增加。吸附研究表明,吸附饱和度随pH值的降低而增加。通过使用FT-IR分析来检查氧化铝悬浮液的表面性质。在酸性介质中,发现静电机制是控制分散的主要机制。在碱性条件下,通过在Al3 +离子和Tiron之间形成内球络合物,化学相互作用在固水界面处发生。通过测量粘度,沉降高度和颗粒的有效直径来表征悬浮液的稳定性。发现最佳pH值为8.5,Tiron的最佳剂量为氧化铝的0.8dmb%(干质量%)。 (C)2002 Elsevier Science B.V.保留所有权利。 [参考:21]

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