Experimental and Theoretical Approach to Multicomponent Adsorption of Selected Aromatics on Hydrophobically Modified Zeolite

Abstract

The adsorption of aqueous solutions of BTEX (benzene, B; toluene, T; ethyl benzene, E; and xylenes, X) on hydrophobically modified zeolite was investigated. Multicomponent kinetics and equilibrium studies were carried out using a batch system. Furthermore, a mathematical model was studied that considers the mass transfer kinetics in a fixed-bed adsorption system. The influences of external mass transfer as well as the constant adsorption equilibrium and intraparticle diffusion resistance on breakthrough curves were evaluated. The adsorption kinetics was adjusted to the homogeneous diffusion model. The breakthrough times of the BTEX compounds increased with an increase in the bed height of the adsorbent and decreased with an increase in the flow. The mathematical model and numerical methodology that were applied represented the data of the present adsorption process with good accuracy.

Synthesis of a novel Fe–Mn binary oxide‐modified lava adsorbent and its effect on ammonium removal from aqueous solutions

“…Additionally, Δ S ° > 0 indicates an increasing disorder between the solid and solution interface during ammonium adsorption (Veličković et al, ; Yan et al, ). Therefore, temperature can affect ammonium adsorption by (a) increasing the diffusion rate of ammonium through the external boundary layer and internal pores of the adsorbent (Toumi, Hamdi, Salem, & Allia, ; Veličković et al, ); (b) increasing the porosity and pore volume of the adsorbent (Abe, Hayashi, Hirashima, Kitagawa, & Kuroki, ); and (c) increasing the active sites available for adsorption (Laabd et al, ; Vidal et al, ).…”

Mass transfer limitations in binderless ZSM‐5 zeolite granules during adsorption of flavour compounds from aqueous streams

“…Previous work has mainly focused on studying the mass transfer in single component systems, e.g. sugar molecules in aqueous solutions, [20][21][22][23][24][25][26] simple alcohols, ketones, and aromatics 27,28 or amino acids. 29 Relevant data is summarized in Table 1.…”

Utilisation of Fly Ash and Magnetite for the Synthesis of Biosurfactant-Modified Magnetic Zeolites by Direct Alkali Fusion

“…The commonly used surfactants are the quaternary ammonium compounds, for example, hexadecyltrimethyl ammonium bromide, with cationic head groups and a hydrocarbon long-chain molecule as the surfactant tail [5,[12][13][14]. Thus, the zeolite surface becomes hydrophobic that allows the adsorbent to retain organic compounds [15].…”

“…Although an array of contaminants such as anions, cations, and organics-phenol, 4-chlorophenol, orange II, bisphenol A, and sodium dodecyl benzene sulfonate have been reportedly removed by surfactantmodified zeolites (SMZ) from aqueous solution [9,[15][16][17][18][19], however, the environmental friendliness of the nanocomposite still raises concerns. Hence, modification with environmentally benign surface-active agents (biosurfactants), rather than with chemical surfactant, is necessary to sustain the novel technology.…”