Umudike Journal of Engineering and Technology

Michael Okpara University of Agriculture, Umudike


ADSORPTION ISOTHERM, KINETIC AND THERMODYNAMIC STUDIES FOR REMOVAL OF TOTAL DISSOLVED SOLID FROM PAINT WASTEWATER USING ACID MODIFIED MUCUNA SHELL

Okolo, B. I.
Department of Chemical Engineering Michael Okpara University, Umudike, Nigeria

Ukandu, O.
Department of Chemical Engineering Michael Okpara University, Umudike, Nigeria

Adindu, A.
Department of Chemical Engineering Michael Okpara University, Umudike, Nigeria

Awak, E.
Department of Chemical Engineering Michael Okpara University, Umudike, Nigeria



ABSTRACT

Present study was conducted to investigate the removal of total dissolved solid (TDS) from paint wastewater (PW) by using phosphoric acid modified mucuna shell (MSA). Characterization of MSA is done by us FTIR, SEM and XRD. Batch experiment was carried out to determine effect of parameters such as pH, biosorbent dose, contact time and temperature. Adsorption capacity of the experimental results was fitted into two isotherm model; Langmuir and Freundlich, but the Freundlich isotherm model was found to have higher correlation coefficient, implying MSA had heterogeneous surface. The adsorption kinetic has been described by pseudo-first-order and pseudo-second-order model. It was observed that the rate of TDS adsorption follow pseudo second-order model. Free energy of adsorption (ΔGo), enthalpy (ΔHo) and entropy (ΔSo) changes are calculated to know the nature of adsorption. The calculated value of ΔGo at 303K-323K indicates that the adsorption process is spontaneous. From the calculation, values of ΔHo and ΔSo shows positive sign, which indicates that the adsorption process is endothermic in nature and the positive, ΔSo suggested increased randomness at the solid/interface.



Keywords: Paint wastewater, Mucuna shell, Adsorption Isotherm, Adsorption kinetic, Thermodynamics


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Conference Code
IECON2019

Conference Title
ENGINEERING FOR SUSTAINABLE ECONOMIC DIVERSIFICATION, FOOD AND NATIONAL SECURITY

ISBN
978-978-53175-8-9

Date Published
Friday, September 20, 2019

Conference Date
2nd - 4th September, 2019

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