Polycyclic aromatic hydrocarbons (PAHs) adsorption on solid surfaces applied to waste lubricant oils recovery process

Abstract

Lubricant oils undergo degradation increasing polycyclic aromatic hydrocarbons (PAHs) concentration. In this work, PAHs adsorption onto activated carbon, powder silica, and powder chitosan surfaces was estimated, with their concentrations in organic solvents (ethanol, 2-propanol, 1-butanol, and terc-butanol) monitored by UV-visible absorption. Equilibrium concentration was attained after 72 h and the isotherms presented characteristic of multilayer formation. The greater surface density was determined for the chitosan, but the system containing activated carbon and 1-butanol presented better efficiency for PAHs removal. Results indicated that the adsorption evaluated in this work can be a potential stage in the waste lubricant oils global recovery process.Les huiles de lubrification subissent une dégradation augmentant la concentration d'hydrocarbures aromatiques polycycliques (HAP). Dans ce travail, on a estimé l'adsorption de HAPs sur du carbone activé, de la silice en poudre et des surfaces de chitosane en poudre, leurs concentrations dans des solvants organiques (éthanol, 2-propanol, 1-butanol et terc-butanol)étant suivies par absorption UV et dans le domaine visible. Une concentration d'équilibre aété atteinte après 72 h et les isothermes présentaient des caractéristiques de formation de couches multiples. La densité de surface la plus importante aété déterminée pour le chitosane mais le système contenant du carbone activé et du 1-butanol présentait une meilleure efficience en matière de retrait des HAPs. Les résultats indiquaient que l'adsorptionévaluée dans ce travail pourrait constituer uneétape potentielle du processus global de récupération des résidus d'huiles de lubrification.

Comparative Studies of RSM, RSM–GA and ANFILS for Modeling and Optimization of Naphthalene Adsorption on Chitosan–CTAB–Sodium Bentonite Clay Matrix

“…There are options employed previously in a bid to treat contaminated aqueous solution containing PAHs, which are sonication, adsorption and biodegradation [5]. For reasons of operational simplicity, cost and ease of obtaining myriads of low-cost adsorbents, the use of adsorption has been widely accepted and it has proved to be efficacious for the removal of PAHs from aqueous solution [6][7]. Cabal et al [8] investigated naphthalene adsorption onto activated carbons derived from bean pod.…”

Extension of lubricant drain interval by modified pure biomass oil filter

“…Globally, nearly 24 million tons of all kinds of waste lubricating oil were produced every year 8 . Due to it contains carcinogenic substances such as polycyclic aromatic hydrocarbons (PAHs) 9 and poly‐chlorinated biphenyls (PCBs), improper handling of waste oil may cause harm to the environment 10…”