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Adsorption of As (III) on Iron Coated Quartz Sand: Influence of Temperature on the Equilibrium Isotherm, Thermodynamics and Isosteric Heat of Adsorption Analysis

  • Shashi Bala Gautam EMAIL logo , Siraj Alam and Suantak Kamsonlian
Published/Copyright: November 21, 2015
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International Journal of Chemical Reactor Engineering
From the journal International Journal of Chemical Reactor Engineering Volume 14 Issue 1

Abstract

The influence of temperature on the sorption of As(III) onto iron oxide coated quartz sand (IOCQS) was studied in the temperature range of 298–318 K. An increase in temperature was found to have positive influence on the adsorption of As(III) ions onto IOCQS surfaces because of increased diffusion of As(III) ions into the pores of IOCQS at higher temperature. The enhanced sorption at higher temperature indicated endothermic adsorption process. Equilibrium isotherms for the adsorption of As(III) on IOCQS were analyzed at different temperatures. Among the conventional isotherms, Freundlich isotherm best predicted specific uptake at different temperatures, followed by Redlich–Peterson, Langmuir and Temkin isotherm models. Various thermodynamic parameters namely heat of adsorption (∆H0), change in entropy (∆S0), and Gibbs free energy change (∆G0) were computed from the equilibrium constant (KD) values. The results indicated positive value for heat of adsorption ∆H0, a positive ∆S0 and a negative ∆G0. Finally, the isosteric heat of adsorption (ΔHst,a) values were calculated and quantitatively correlated with the fractional loading of As(III) onto IOCQS. The surface heterogeneity of adsorbents could be quantitatively described with an isosteric enthalpy function of fractional loading based on Do and Do model. The results show that the IOCQS possesses heterogeneous surface with sorption sites having different activities.

Keywords: Adsorption; As(III); IOCQS; isotherms; error analyses

Nomenclature

1/n

heterogeneity factor, dimensionless

aR

constant of Redlich –Peterson isotherm (l/mg).

B1

related to the heat of adsorption (mg/g)

C

constant that gives idea about the thickness of boundary layer (mg/g)

Ce

equilibrium concentration liquid phase concentration (mg/l).

ΔG0

free energy change (kJ/mol),

ΔH0

change in enthalpy (kJ/mol),

IOCQS

iron oxide coated quartz sand

KD (=qe/Ce)

single point or linear sorption distribution coefficient.

kf

rate constant of pseudo- first order adsorption model (min–1)

ks

rate constant of pseudo- second order adsorption model (g/mg/s)

kid

inter particles diffusion rate of constant (mg/g/min1/2)

KF

constant of Freundlich isotherm ((mg/g)/(l/mg)1/n)

KL

constant of Langmuir isotherm (l/g)

KT

equilibrium binding constant corresponding to maximum binding energy (l/g)

kR

constant of Redlich –Peterson isotherm (l/g)

qe

equilibrium solid phase concentration (mg/g)

qe,cal

calculated value of solid phase concentration of adsorbate at equilibrium (mg/g)

qe.exp

experimental value of solid phase concentration of adsorbate at equilibrium (mg/g)

qm

maximum adsorption capacity of adsorbent (mg/g)

qt

amount of adsorbate adsorbed by adsorbent at time t

R

universal gas constant (8.314 J/K mol)

SSE

sum of square error function

t

time (min)

R

universal gas constant (8.314×10–3 kJ/mol K)

ΔS0

entropy change (kJ/mol K),

T

absolute temperature (K)

Greek symbol

α

initial adsorption rate constant (mg/g/s)

β

desorption constant (g/mg)

β1

constant of Redlich–Peterson isotherm (0 <β1 <1)

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Published Online: 2015-11-21
Published in Print: 2016-2-1

©2016 by De Gruyter

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https://doi.org/10.1515/ijcre-2015-0061
Keywords for this article
Adsorption; As(III); IOCQS; isotherms; error analyses

Articles in the same Issue

  1. Frontmatter
  2. Review
  3. Novel Membrane Reactor Concepts for Hydrogen Production from Hydrocarbons: A Review
  4. Research Articles
  5. Modeling and Simulation Study of an Industrial Radial Moving Bed Reactor for Propane Dehydrogenation Process
  6. Oxidative Degradation of Methylene Blue in Aqueous Medium Catalyzed by Lab Prepared Nickel Hydroxide
  7. CFD Modelling of a Hollow Fibre Membrane for CO2 Removal by Aqueous Amine Solutions of MEA, DEA and MDEA
  8. Performance Study of a Thermally Double Coupled Multi-Tubular Reactor by Considering the Effect of Flow Type Patterns
  9. Radiative Three-Dimensional Flow with Chemical Reaction
  10. Three-Phase Model of a Fluidized-Bed Catalytic Reactor for Polyethylene Synthesis
  11. Study on the Effect of Nickel Doping on Mo-Bi Based Catalyst for Selective Oxidation of Isobutene to Methacrolein
  12. DM Water Plant Sedimentation as a Cheap and Waste Source of Catalyst for Biodiesel Production
  13. Recovery of Biogas from Meat Industry Wastewater Using Continuously Stirred Tank Reactor (CSTR): Modeling and Optimization
  14. Comparison of CFD Simulation and Simplified Modeling of a Fluidized Bed CO2 Capture Reactor
  15. Kinetic Study for Platinum Extraction from Spent Catalyst in Cyanide Solution at High Temperatures
  16. Hydroisomerization of Biomass Derived n-Hexadecane Towards Diesel Pool: Effect of Selective Removal External Surface Sites from Pt/ZSM-22
  17. Heat Flux and Variable Thermal Conductivity Effects on Casson Flow and Heat Transfer due to an Exponentially Stretching Sheet with Viscous Dissipation and Heat Generation
  18. Optimization of Nickel Chemical Extraction from Hazardous Residue
  19. Green Approach for Biodiesel Production from Jojoba Oil Supported by Process Modeling and Simulation
  20. Differentiating Process Performance of Various Coagulants in Removal of Congo red and Orange G Dyes
  21. CFD Simulation of Hydrodynamic of a Bubble Column Reactor Operating in Churn-Turbulent Regime and Effect of Gas Inlet Distribution on System Characteristics
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  24. Screening of Alternative Carbon Sources for Recombinant Protein Production in Pichia pastoris
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  26. Model of Reactive Transport within a Light Photocatalytic Textile
  27. Preparation of Chitosan based Nanofibers: Optimization and Modeling
  28. Adsorption of As (III) on Iron Coated Quartz Sand: Influence of Temperature on the Equilibrium Isotherm, Thermodynamics and Isosteric Heat of Adsorption Analysis
  29. Resistance Characteristics of Coal Slime in Pipe Flow at High Pressure
  30. Activity Comparison of Acidic Resins in the Production of Valuable Glycerol Acetates
  31. Bulk Polymerization of Styrene using Multifunctional Initiators in a Batch Reactor: A Comprehensive Mathematical Model
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  35. Prediction of Reactivity Ratios in Free Radical Copolymerization from Monomer Resonance–Polarity (Q–e) Parameters: Genetic Programming-Based Models
  36. Steady-State Modeling of Pt-Catalyzed H2 Combustion in a Monolithic Reactor: From Micro- to Macro-kinetics
  37. Premixed Methanol–Air Combustion Characteristics in a Mini-scale Catalytic Combustor
  38. Kinetic Modeling of VOC Photocatalytic Degradation Using a Process at Different Reactor Configurations and Scales
  39. Improvement of Activated Sludge Process Using a Nonlinear PI Controller Design via Adaptive Gain
  40. Modeling and Simulation of a Pilot-Scale Bubbling Fluidized Bed Gasifier for the Gasification of High Ash Indian Coal Using Eulerian Granular Approach
  41. Performance of a Catalytic Gas–Solid Fluidized Bed Reactor in the Presence of Interparticle Forces
  42. Mathematical Modeling of Biodiesel Production under Intense Agitation
  43. Extended Aeration Activated Sludge Reactor (EAASR) for Removal of Nitrobenzene: Air Stripped or Biologically Removed?
  44. CFD Modeling of Algae Flash Pyrolysis in the Batch Fluidized Bed Reactor Including Heat Carrier Particles
  45. A Robust Extended State Observer for the Estimation of Concentration and Kinetics in a CSTR
  46. Dynamic Modeling of CATOFIN® Fixed-Bed Iso-Butane Dehydrogenation Reactor for Operational Optimization
  47. Effect of Biomass Compositions on Combustion Kinetic Parameters using Response Surface Methodology
  48. Short Communications
  49. Discussions on Particle Flux Measurement in Gas-Solids Risers
  50. Use of New Regeneration Processes for Thermolabile Amines
  51. Oxidative-Extractive Desulfurization of Liquid Fuel by Dimethyl Sulfoxide and ZnCl2 Based Ionic Liquid
  52. Corrigendum
  53. Corrigendum to: Performance Analysis of Immobilized Enzyme Semifluidised Bed Bioreactors
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