Development of synthetic zeolites from bio-slag for cesium adsorption: Kinetic, isotherm and thermodynamic studies

Shahjalal Khandaker, Yusaku Toyohara, Ganesh Chandra Saha, Md Rabiul Awual, Takahiro Kuba

Research output: Contribution to journalArticle

Abstract

This study reported a novel synthetic zeolite based adsorbent developed from the municipal wastewater sludge molten slag (bio-slag) through the hydrothermal modification process for removal of cesium (Cs) from simulated wastewater. The artificial zeolites were produced from the raw bio-slag which was identified by the several physicochemical experimental procedures such as the surface area analysis (the BET technique), the FESEM, the XRF and the XRD. The Cs adsorption process of modified bio-slag was exmined by the linear pseudo-first order, pseudo-second order and intra-particles diffusion models whilst the second order kinetic model confirmed a better agreement with the correlation coefficient, R2 = 0.999-1.000 for 20-400 mg/L Cs solution. The Langmuir, Freundlich and the Temkin isotherm model were investigated using the adsorption isotherm data. A satisfactory correlation coefficient value (R2= >0.980) proved that the isotherm parameters were perfectly fitted to the Langmuir and Freundlich model and the highest Cs adsorption ability of modified bio-slag were 51.02, 51.02 and 49.51 mg/g at 288, 298 and 308 K, respectively. The better agreement of adsorption data with the second order kinetic model and the Langmuir model proved the adsorption mechanism was controlled by the chemical reaction (ion-exchange). Thermodynamic studies under the different temperatures proved that the adsorption reaction was endothermic (ΔH =20.53 kJ/mol) and ΔS = 0.021 kJ/mol/K) and non-spontaneous (ΔG>0). Moreover, the modified bio-slag effectively removed Cs even in the co-existence of Na+ and K+ as competitive ions at their wide range of concentrations (upto 300 mM) although the higher concentration slightly affected the Cs adsorption.

Original languageEnglish
Article number101055
JournalJournal of Water Process Engineering
Volume33
DOIs
Publication statusPublished - Feb 2020

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Zeolites
Cesium
cesium
slag
Thermodynamics
Slags
Adsorption
Isotherms
isotherm
thermodynamics
adsorption
kinetics
Kinetics
Waste Water
Wastewater
wastewater
Sewage sludge
Adsorption isotherms
Ion Exchange
Adsorbents

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Safety, Risk, Reliability and Quality
  • Waste Management and Disposal
  • Process Chemistry and Technology

Cite this

Development of synthetic zeolites from bio-slag for cesium adsorption : Kinetic, isotherm and thermodynamic studies. / Khandaker, Shahjalal; Toyohara, Yusaku; Saha, Ganesh Chandra; Awual, Md Rabiul; Kuba, Takahiro.

In: Journal of Water Process Engineering, Vol. 33, 101055, 02.2020.

Research output: Contribution to journalArticle

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