Mitigation of Diclofenac Pollution in Aqueous Media by Adsorption

Ighalo, Joshua O.; Adeniyi, Adewale George

doi:10.1002/cben.201900020

Cited by 36 publications

(3 citation statements)

References 82 publications

(170 reference statements)

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“…The Gibbs free energy change (ΔG) values can discern whether a process is spontaneous is not, and the negative values of ΔG imply a spontaneous process. The enthalpy change (ΔH) provides information about the exothermic nature or endothermic nature of the process and differentiate between the physical and chemical adsorption process (Ighalo and Adeniyi 2020c). The intercepts and slopes of van't Hoff's plots (not shown) were used to compute the thermodynamic parameters.…”

Section: Biosorption Thermodynamics Studiesmentioning

confidence: 99%

Response surface modelling of the biosorption of Zn(II) and Pb(II) onto Micropogonias undulatus scales: Box–Behnken experimental approach

Ighalo

Eletta

2020

Appl Water Sci

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In this study, the scales of Micropogonias undulatus fish were investigated as precursors for the development of low-cost biosorbent for the removal of Pb(II) and Zn(II) from aqueous media. The biosorbent was characterised using Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM) and X-ray diffractometry (XRD). Adsorption parameters (temperature, biosorbent dosage and contact time) were optimised using response surface methodology Box-Behnken experimental design. The optimal factors for Zn(II) removal by croaker fish scale were 145.5 min, 7.01 g/L biosorbent dosage, 30 °C and pH 5.4. The optimal factors for the removal of Pb(II) were 179.3 min, 6.61 g/L biosorbent dosage, 20 °C and pH 3.4. The numerical optimisation revealed that the optimal removal efficiency for Zn(II) and Pb(II) sorption is 96.45% and 98.76%, respectively. The biosorption of both heavy metals was best fit to Freundlich isotherm and pseudo-second-order kinetic models. Thermodynamics studies revealed that the biosorption process was exothermic and spontaneous. Keywords Biosorption • Croaker • Fish scales • Heavy metals • Box-Behnken Abbreviations AAS Atomic absorption spectrophotometry ANOVA Analysis of variance BBD Box-Behnken design Df Degree of freedom DOE Design of experiments FS Fish scales FTIR Fourier transform infrared spectroscopy Rpm Rounds per minute RSM Response surface methodology SEM Scanning electron microscopy XRD X-ray diffractometry List of symbols α Temkin isotherm constant (equilibrium binding constant) (L/mol) Ǻ Armstrong b Temkin constant related to the adsorption heat β Constant related to adsorption energy (mol 2 /J 2) C Constant of the thickness of boundary layer C e Equilibrium concentration (mg/L) C i Initial concentration (mg/L) C L Equilibrium concentration in the liquid phase C S Equilibrium concentration in the solid phase K F Freundlich constant (mg/g) K E Equilibrium constant K 1 Rate constant of the pseudo-first-order model (min −1) K 2 Rate constant of the pseudo-second-order model (gm g −1 min −1) K dif Intra-particle diffusion rate constant (mg/ gmin 0.5) K L Langmuir constant related to affinity (l/g) n Freundlich constant q e Amount of chemical species removed at equilibrium (mg/g) q max Maximum metal uptake (mg/g)

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Section: Biosorption Thermodynamics Studiesmentioning

confidence: 99%

Response surface modelling of the biosorption of Zn(II) and Pb(II) onto Micropogonias undulatus scales: Box–Behnken experimental approach

Ighalo

Eletta

2020

Appl Water Sci

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“…Wastewater has been explained as water that has been used and contains dissolved or suspended waste materials or water that has dwindling quality due to the adverse effect of anthropogenic activities (Ighalo and Adeniyi 2020c;Singh and Gupta 2017). Razak (2010) reported that about 60% -85% of water usage becomes wastewater.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of <i>Luffa Cylindrica</i> Fibers in A Biomass Packed Bed for The Treatment of Paint Industry Effluent Before Environmental Release

Ighalo

Adeniyi

Oke

et al. 2020

EUROPEAN J SUSTAINAB DEV

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The aim of this study was to investigate the potential of Luffa Cylindrica fibers in a biomass packed bed for the treatment of paint industry effluent before releasing into the environment. The fibers were modified by mercerisation in 0.5M NaOH for 24 h. Both modified and unmodified fibers were characterised using Scanning Electron Microscopy with Energy-Dispersive X-ray Spectroscopy (SEM-EDS). A biomass packed bed was prepared for the study with a packing factor of 0.0617 and 0.0550 for the modified and unmodified fibers respectively. Measured parameters were the pH, colour, total dissolved solids (TDS), total suspended solids (TSS), dissolved oxygen (DO), chemical oxygen demand (COD) and biochemical oxygen demand (BOD). Negative findings were achieved for TSS, DO and COD whilst positive findings were achieved for pH, colour, TDS and BOD. The extended residence time of 48 h was only of advantage for colour and BOD removal. In the domain of the positive results, the untreated fibers achieved 35% colour reduction, 5% TDS reduction and 77% BOD reduction all in 2 h. The treated fibers achieved 35% colour reduction in 30 minutes, 32.5% TDS reduction in 2 h and 82% BOD reduction in 30 minutes. The fibers treated with NaOH performed better in all indices where positive results were achieved except for pH. Luffa cylindrica fibres can be used as effective packing material in a biomass filter for the treatment of paint industry effluent before releasing into the environment based on WHO limits.

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“…Recently, the removal of silica, TDS and other pollutants from industrial wastewater has become a thought-provoking task for the environmental process engineers (Eletta et al 2020;Ighalo and Adeniyi 2020b). High silica and TDS contents of wastewater will always be a concern, especially when the wastewater is to be reclaimed for specific reuse purposes.…”

Section: Introductionmentioning

confidence: 99%

Auto-correlation robustness of factorial designs and GAMS in studying the effects of process variables in a dual-objective adsorption system

Amosa¹,

Aderibigbe

Adeniyi

et al. 2021

Appl Water Sci

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The performance of factorial designs is still limited due to some uncertainties that usually intensify process complexities, hence, the need for inter-platform auto-correlation analyses. In this study, the auto-correlation capabilities of factorial designs and General Algebraic Modeling System (GAMS) on the effects of some pertinent operating variables in wastewater treatment were compared. Individual and combined models were implemented in GAMS and solved with the trio of BARON, CPLEX and IPOPT solvers. It is revealed that adsorbent dosage had the highest effect on the process. It contributed the most effect toward obtaining the minimum silica and TDS contents of 13 mg/L and 814 mg/L, and 13.6 mg/L and 815 mg/L from factorial design and GAMS platforms, respectively. This indicates a concurrence between the results from the two platforms with percentage errors of 4.4% and 0.2% for silica and TDS, respectively. The effects of the mixing speed and contact time are negligible.

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Mitigation of Diclofenac Pollution in Aqueous Media by Adsorption

Cited by 36 publications

References 82 publications

Response surface modelling of the biosorption of Zn(II) and Pb(II) onto Micropogonias undulatus scales: Box–Behnken experimental approach

Response surface modelling of the biosorption of Zn(II) and Pb(II) onto Micropogonias undulatus scales: Box–Behnken experimental approach

Evaluation of <i>Luffa Cylindrica</i> Fibers in A Biomass Packed Bed for The Treatment of Paint Industry Effluent Before Environmental Release

Auto-correlation robustness of factorial designs and GAMS in studying the effects of process variables in a dual-objective adsorption system

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