Adsorption of naphthalene on zeolite from aqueous solution

Abstract

Polynuclear aromatic hydrocarbons (PAHs), which are environmental hormones and carcinogens, are viewed as the priority pollutants to deal with by many countries. Most PAHs are hydrophobic with high boiling and melting points and high electrochemical stability, but with low water solubility. Compared with other PAH species, naphthalene has less toxicity and is easily found in the environment. Thus, naphthalene is usually adopted as a model compound to examine the environmental and health aspects of PAHs. This study attempted to use an adsorption process to remove naphthalene from a water environment. The adsorption equilibrium of naphthalene on zeolite from water-butanol solution, which is a surfactant-enriched scrubbing liquid, was successfully evaluated by Langmuir, Freundlich, and linear isotherms. Among the tested kinetics models in this study (e.g., pseudo-first-order, pseudo-second-order, and Elovich rate equations), the pseudo-second-order equation successfully predicted the adsorption.

Removal of Polycyclic Aromatic Hydrocarbons from Aqueous Solution on Soybean Stalk–based Carbon

“…Additionally, PAHs are not efficiently removed by conventional physicochemical methods such as coagulation, flocculation, sedimentation, filtration, or ozonation (Crisafully et al, 2008). However, extensive research has been conducted using various sorbents to bind PAHs in contaminated water (Walters and Luthy, 1984; Chang et al, 2004; Valderrama et al, 2007; Cabal et al, 2009b). The most commonly used porous media for the removal of contaminants from aqueous solution is activated carbon (Ania et al, 2007a; Cabal et al, 2009a; Valderrama et al, 2008).…”

Batch study, equilibrium and kinetics of adsorption of naphthalene using waste tyre rubber granules

“…The water-methanol solution was used instead of pure de-ionized water to enhance the solubility of hydrophobic naphthalene. 4,7 Working solutions of volume 100 mL with different concentrations of naphthalene were prepared by appropriate dilutions of the stock solution with distilled water immediately prior to their use. The dilutions were done by dispensing a quantity of the stock solution into 250 mL amber bottles according to Equation (1): (1) where: C 1 , concentration of standard solution (mg/L); V 1 , volume from standard solution in (mL); C 2 , required concentration in (mg/L); V 2 , volume of required solution (100 mL).…”

“…Similar observations have been reported for the adsorption of aromatics by WTRG and other adsorbents. 4,7,13,41 …”

“…5 Various methods for removing naphthalene from aqueous solutions including photocatalytic oxidation, biodegradation using surfactants, electron beam irradiation, ozonation and adsorption using zeolites and activated carbon have been reported. [6][7][8][9][10][11] Adsorption remains the best option for the removal of naphthalene from solution as it can generally remove the compound in a simple and easy operation. However, the high cost associated with the use of activated carbon and other special adsorbents limits their applicability in treating large volumes of contaminated effluents.…”

Naphthalene sorption on red clay and halloysite modified by quaternary ammonium salts

“…Paper mills also release these compounds to the environment. PAHs are hydrophobic, have high melting, boiling points and electrochemical stability; therefore, they can stay for a long time in the environment (Chang et al., 2004) and can be dangerous owing to their toxic and carcinogenic properties. For these reasons, World Health Organization introduced the limit of PAHs in drinking water.…”