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Effective Dephenolation of Effluent from Petroleum Industry Using Ionic-Liquid-Induced Hybrid Adsorbent

  • M. N. Abonyi
  • C. O. AniagorEmail author
  • M. C. Menkiti
Research Article - Chemical Engineering

Abstract

In this study, naturally heated clay (NHC) was complexed with synthesized ionic liquid (1-ethyl-3-methyl imidazolium bromide solution (EMIB)) to form NHC/EMIB composite. The effectiveness of NHC/EMIB composite in comparison with naturally heated clay (NHC) as an eco-friendly adsorbent for dephenolation of petroleum effluent was investigated. The adsorbents were characterized using Fourier transform infrared spectroscopy and scanning electron microscopy. Batch mode experiments were conducted to ascertain the effect of process variables on adsorption. Removal efficiencies of 81.70% and 91.7% were obtained for NHC and NHC/EMIB composite, respectively, at 25 min, 308 K, pH 4.0 and 150 µm. The linear and nonlinear isotherm data fitted best to the Langmuir model for both adsorbent, while the linear and nonlinear kinetic data fitted best to pseudo-second-order and pseudo-first-order models for both adsorbents. The estimated average thermodynamic parameters (ΔG0 = − 9.653 kJ/mol, ΔH0 = –28.295 kJ/mol and ΔS0 = –46.395 kJ/mol) revealed the feasibility, exothermic nature and spontaneity, respectively, of the studied adsorption system.

Keywords

1-Ethyl-3-methyl imidazolium bromide Hybridized adsorbent Petroleum effluent Dephenolation Isotherm 

List of Symbols

A

Temkin constant, L/g

Ce

Equilibrium concentration, mg/L

Co

Initial concentration, mg/L

Ct

Concentration at time t, mg/L

G

Free energy change, KJ/mol

H

Enthalpy change, KJ/mol

K1

Pseudo-first-order kinetic constant

K2

Pseudo-second-order kinetic constant

Kf

Freundlich constants, L/g

M

Total mass of the adsorbent, g

n

Freundlich constants

Q

Adsorption capacity, mg/g

\( q_{\text{e}} \)

Adsorption capacity at equilibrium, mg/g

\( q_{\text{m}} \)

Maximum adsorption capacity for a complete monolayer coverage

\( q_{\text{t}} \)

Adsorption capacity at time, mg/g

R

Universal gas constants, j/mol k

RL

Dimensional separation factor

S

Entropy change, J/mol k

t

Time, min

T

Temperature, K

W

Weight of adsorbent

Abbreviations

ARE

Average relative error

COD

Chemical oxygen demand

DO

Dissolved oxygen

EABS

The sum of absolute errors

EMIB

1-Ethyl-3-methyl imidazolium bromide

HYBRID

The hybrid error function

NESREA

National Environmental Standards and Regulation Enforcement Agency

PFO

Pseudo-first order

PSO

Pseudo-second order

RMSE

Root-mean-square error

TDS

Total dissolved solids

TSS

Total suspended solids

USPH

United State Public Health

WHO

World Health Organization

Supplementary material

13369_2019_4000_MOESM1_ESM.docx (32 kb)
Supplementary material 1 (DOCX 32 kb)

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Copyright information

© King Fahd University of Petroleum & Minerals 2019

Authors and Affiliations

  1. 1.Chemical Engineering DepartmentNnamdi Azikiwe UniversityAwkaNigeria
  2. 2.Civil and Environmental Engineering Department, Water Resources CenterTexas Tech UniversityLubbockUSA

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