Presented at the Ist International Symposium on Innovative Approaches in Scientific Studies (ISAS 2018), Kemer-Antalya, Turkey, Apr 11, 2018

SETSCI Conference Proceedings, 2018, 2, Page (s): 169-169 , https://doi.org/

Published Date: 23 June 2018    | 1003     6

The high consumption of surfactants throughout the world (more than 15 million tons/year), together with their toxicity and negative effect on the self-purification capability of surface waters, make these synthetic organic compounds one of the main environmental concerns. Surfactants are widely used in industries and households and can often be detected in wastewater in high concentration. The wettability of hydrophilic solid surfaces in the presence of surfactant solutions has many practical applications such as detergency, surface cleaning, coating, adhesion, printing, colloidal stability, and flotation of minerals. Adsorption of surfactants onto soil particles is anticipated to influence both the physicochemical and the biological properties of the soil. The presence of electrolyte as additive on single or mixed ionic surfactants solutions affect the adsorption density of the surfactant molecules through the reduction in electrostatic repulsive force among the head groups of the surfactant molecules at air–liquid and solid–liquid interfaces, which in turn influence the surface tension of the solution as well contact angle on solid surface. In our study, the effect of calcium ions on micelle structure of anionic surfactant (LABSA) was studied. In experiments were be used marble waste powder as Ca+2 source. The interaction between the micelles and Ca+2 was determined via UV spectrophotometer, pH and conductivity. The powder amount (0.1, 0.2 and 0.3 g/100ml), contact time (10-1440 minute), surfactant concentration (100-200 ppm) were chosen as parameters.

As a result, the anionic surfactant micelles were adsorbed on the powder due to electrostatic interaction of Ca (+) ions. It was observed that UV abs – pH and UV abs - conductivity had a linear relationship for 200 ppm concentration. On the other hand, while UV abs – pH had a linear relationship for 100 ppm concentration, it was showed that UV abs – conductivity hadn’t a linear relationship in 100 ppm concentration for the powder amount 0.2 g/ 100 ml. Because the solution concentration was under critic micelle concentration (CMC) after adsorption, micelles were dispersed random under the influence of electrical repulsive forces in solution under CMC.  

Keywords - Anionic surfactant, environmental effect, micelle behavior, Ca+2 ions, CMC