Fixed-bed adsorption dynamics of Pb (II) adsorption from aqueous solution using nanostructured γ-alumina

Abstract

In this work, MWCNT-COOH-cellulose nanocomposite was prepared with MWCNT-COOH, SOCl2 as leaving group and cellulose as an adsorbent (A1); MgO nanoparticles have been successfully coated on the surface of nanocomposite by directly adding to A1 (MWCNT-COOH-cellulose-MgO; A2), magnesium nitrate was added to A1 and MgO nanoparticles were achieved by coating indirectly on the surfaces (MWCNT-COOH-cellulose-MgO; A3). These nanocomposites (A1, A2, and A3) were used for the removal of methyleneblue (MB) dye from aqueous solution. For characterization of adsorbent surfaces, the FT-IR, TEM, SEM, and XRD analysis were used. The effects of initial concentration of MB dye, contact time, and temperature on the adsorption were studied. According to the results, 55 min was selected as the optimum contact time for the removal process. The equilibrium data of adsorption were well fitted and the Langmuir (type III) model had the best agreement because it possesses high value of linear regression, high value R 2 , and least value of average relative error, ARE (%). Parameters of thermodynamics including enthalpy (∆H°), entropy (∆S°), and Gibbs energy (∆G°) were calculated. Kinetic data had best agreement with pseudo-second-order model. Graphical abstract Schematic synthesis of MWCNT-COOH-cellulose-MgO NP nanocomposite as adsorbent

Adsorción competitiva de plomo y niquel sobre cáscara de ñame y bagazo de palma en sistema continuo

“…El modelo de Adam-Bohart (ecuación 1) se usa en la descripción de la curva de ruptura por encima del punto de saturación del adsorbente [27,31]. Éste modelo asume que la velocidad de adsorción es proporcional a la capacidad de adsorción y a la concentración de la especie adsorbida, y está descrito por la ecuación 1, donde K AB es la constante cinética de Adams-Bohart en L.mg -1 .min -1 , N 0 es la capacidad máxima de adsorción volumétrica en mg.L -1 , V la velocidad lineal de flujo en cm.min -1 , L la profundidad del lecho en cm, C 0 la concentración inicial mg. L -1 , C t la Concentración del efluente en mg.L -1 :…”

“…El Modelo Yoon-Nelson (ecuación 2), supone que la tasa de disminución de la probabilidad de adsorción para cada molécula de adsorbato es proporcional a la probabilidad de adsorción adsorbato y la probabilidad de avance sorbato en el adsorbente [30,31]. Éste modelo se representa en la ecuación 2 donde K YN es la constante de Yoon-Nelson en min -1 , y Yτ es el tiempo requerido para adsorber el 50% del adsorbato inicial en min:…”

Pilot Plant Conversion of Blackcurrant Seeds into New Micronutrient Fertilizer Biocomponents via Biosorption

“…This model assumes no axial dispersion and Langmuir adsorption-desorption kinetics (Saadi et al 2013). The Thomas model is given as Eq.…”

Removal of Ni (II) Ions on to Polymer Loaded Sawdust (PLSD)–Batch Adsorption Studies

“…The shifts in the position of peaks before and after Ni (II) ions loading indicates that metal ion well associated with the binding centers of atom containing O, N, S and aromatic ring, etc [23][24][25]. The anionic surface modifications of PLSD is indicated by the observed change in position of peaks of asymmetric sulphites (ie., from 1197.…”