Investigation on the Effect of an Divalent Electrolyte on the Flocculation of SDBS with Al³⁺

Abstract:

The effect of an divalent electrolyte Ca²⁺ on the flocculation of two different concentrations of anionic surfactant Sodium Dodecylbenzenesulfonate (SDBS) with Al³⁺ has been investigated at different molar ratios Al³⁺ to SDBS at 298.15 K. The results showed that the flocculation characteristics of 0.01 mol•L-1 SDBS (above the critical micelle concentration CMC) and 0.001 mol•L-1 SDBS (below the CMC) were obviously different with an increase of dosages of Al³⁺. The z-average size of flocculate of 0.01 mol•L-1 SDBS with Al3+ decreased particularly with the pre-addition of Ca²⁺，It suggested the formation of the complexion Ca(SDBS)2. At optimization flocculation areas at 298.15K, pH values were all around 3.5 in the flocculation systems SDBS/Al³⁺ and Ca²⁺/SDBS/Al³⁺ whether the SDBS concentration above or below the CMC. The pre-addition of Ca²⁺ slightly affected other flocculation parameters of SDBS/Al3+ systems such as zeta potential, surface tension, conductivity and pH.

• Periodical: Advanced Materials Research (Volumes 610-613)
• Pages: 163-168
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.610-613.163
• Online since: December 2012
• Authors: Jie Yan, Dong Wang, Fei Fei Yang, Dong Mei Yao
• Keywords: Aluminum (Al), CMC, Flocculation, SDBS, Z-Potential

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