Environmental Pollution and Protection

Removal of Motor Oil using Hydrophobic Nano-Silica

Download PDF (834.3 KB) PP. 182 - 192 Pub. Date: December 1, 2017

DOI: 10.22606/epp.2017.24004

Author(s)

Syed Sabir^*
Chemical Engineering Department, King Saud University, P.O. Box 800, Riyadh-11421, Saudi Arabia

Abstract

Because of its environmental and economic impact, oil contamination is a global concern, and the treatment of oily water leftovers a challenge to environmental scientists and technologists. Amid current techniques for oil treatment, sorption is popular since it is inexpensive, easy and effective. Non-toxicity and availability at a competitive price are important aspects in the selection of adsorbents. In the present investigation, the effectiveness of a commercially existing hydrophobic nano-silica (R 812) was examined for the removal of motor oil (HD 40) from oily water, with the effect of pH being analyzed for its removal efficiency. The highest removal of oil (up to 95%) was obtained for a pH value of 7. The results of the batch kinetic studies revealed a high level of correlation with first-order kinetics. The adsorption isotherm behavior was also studied for different adsorbent dosages at pH 7. The isotherm data were fitted with various models reported in the literature. The fit was mostly found to be poor. It is found here that nano-silica (R 812) with a surface area of 260 m2/g can effectively remove as much as 15g of motor oil per gram of the adsorbent at neutral pH.

Keywords

Hydrophobic; isotherms; motor oil; nano-silica; sorption.

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