Cement-based diesel exhaust emission soot coatings for the removal of organic pollutants from water

The cement and diesel exhaust emission soot (DEES) were mixed in different proportions and cement-based DEES coatings were prepared. These coatings were applied as an adsorbent and successfully examined for the removal of various kinds of organic pollutants like methylene blue (MB), rhodamine B (RB), ciprofloxacin and detergent from the water. Maximum removal of 72, 88, 92, 93% was recorded for RB, ciprofloxacin, MB, and detergent respectively using cement-DEES coating consists of 50% DEES by weight. These cement-DEES coatings were also examined for six cycles to ensure re-usability for the adsorption of MB and RB. Kinetic study of adsorption was performed with pseudo-first and second-order kinetic models. Pseudo-second-order kinetic model was found most appropriate. Intra-particle diffusion model study shows that intra-particle diffusion is not the only rate limiting step during adsorption of MB and RB using cement-DEES coatings as an adsorbent. (C) 2019 Elsevier Ltd. All rights reserved.