نتایج جستجو برای: kt and maximum adsorption capacity dubinin

تعداد نتایج: 16878293  

In this work, a low-cost activated carbon as well as non-hazardous material, with high adsorption capacity, was prepared from Melia azedarach fruit (MF) by ZnCl2 activation for the removal of Pb(II) toxic metal from aqueous solutions. The microstructure of the activated carbon was observed by Scanning Electron Microscopy (SEM). Batch experiments have been performed as a function of pH, contact ...

2012
YASSER HANNACHI Y. Hannachi

In this study Ceramium virgatum has been characterized and used for the removal of cadmium and lead from aqueous solutions. The effect of pH, adsorbent dosage, contact time and temperature on adsorption process was studied in batch experiments. Langmuir and Freundlich models were applied to describe the biosorption isotherm of the metal ions by C. virgatum biomass. The adsorption data can be we...

2014
Lívia F. Zeferino Ivanise Gaubeur Maria E. V. Suárez-Iha Patricia A. M. Freitas

Green coconut fiber (Cocos nucifera L.) has been largely used in solid-phase extraction. The effect of the initial dye concentration (1.91, 3.02 and 4.02) × 10−5 mol∙L−1 and solid phase contact (SPE) time were evaluated at different temperatures (283, 298 and 313) K at pH 2. Kinetic experimental data were applied to three simplified kinetic models: pseudo-first order, pseudo-second order, and i...

2015
Muhammad Tahir Abdulrahman Ali Alazba Muhammad Shafiq

The studies of the kinetics and isotherms adsorption of the Reactive Black 5 (RB5) onto bentonite clay were explored in a batch study in a laboratory. The maximum RB5 adsorption conditions of bentonite clay were optimized such as shaking speed (100 rpm), temperature (323 K), pH (10), contact time (40 min), initial dye concentration (170 mg·L−1), and particle size (177 μm). The adsorbent surface...

The aim of this study is to investigate the nitrate adsorption on granular ferric hydroxide (GFH). The effect of factors such as initial concentration of nitrate, pH, contact time, and adsorbent mass were determined. The study was done in laboratory–scale in which synthetic nitrate solutions in a batch reactor were placed in contact with the adsorbent to model adsorption kinetics. It was found ...

2004
Seyed A. Dastgheib Tanju Karanfil

Where V is the adsorbed gas volume at relative pressure of P/P0; V0 maximum volume of adsorbed gas in micropores; R the universal gas constant (0.0083144 kJ/K mol); T the analysis temperature (K); and E is the adsorption energy (kJ/mol). From the linearized plot of DR equation, V0 and E are calculated. By using a conversion factor the equivalent liquid volume or micropore volume can be calculat...

Journal: :Water Science and Technology 2021

Abstract The adsorption performance of pyridine onto polyaluminium chloride (PAC) and anionic polyacrylamide (APAM) water treatment residuals (WTRs) was investigated by batch experiments. This study confirmed the assumption that PAC–APAM WTRs had ability to remove pyridine. non-linear Dubinin–Radushkevich model Freundlich better described isotherms, indicating a chemically controlled multilayer...

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2015
hongbo xu dan-dan liu lu he na liu guiling ning

the poly(ethyleneimine)-functionalized silica has been developed successfully as an effective adsorbent for the adsorption removal of cu(ii) ions from electroplating wastewater. the influences of ph, contact time and initial concentration of cu(ii) ions on the adsorption capacity and the effect of adsorbent dosage on the removal efficiency of cu(ii) ions from electroplating wastewater were inve...

Journal: :Microporous and Mesoporous Materials 2021

Simple isotherm models can fit microporous adsorption yet the molecular interactions underlying successful fitting have often remained obscure. Here we demonstrate how semi-empirical model data be mined to reveal reality of adsorbate-adsorbate interactions. This was made possible by fluctuation theory, a rigorous theory based only on principles statistical thermodynamics. For carbons, quantifie...

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