Title: Thermodynamic Properties of Polyaromatic Hydrocarbons Adsorption from Wastewater using Pineapple-Crown-Based Cellulose
Authors: Oladimeji
F.O.
Alade
A.O.
Tijani
I.O.
Abdulrasheed
W.A.
Olarinde
M.O.
Ilori
K.P.
Agoro
M.K.
Olatunji
Egbeyemi
Afolabi
T.J.
Volume: 9
Issue: 3
Pages: 80-87
Publication Date: 2025/03/28
Abstract:
The high concentration of Polyaromatic hydrocarbons (PAHs) in produced water which are possibly carcinogenic both to humans and wildlife animals poses a significant threat to the environment giving rise to the need for a sustainable and economical method for PAHs elimination in produced water which is the use of Pineapple crown cellulose (PCC) as an adsorbent in the wastewater treatments as conventional methods are not efficient. The thermodynamic properties of batch adsorption of the PAHs in produced water onto the PCC, under the effect of temperature, were investigated in this study. The raw pineapple crown leaves were processed, treated with NaOH aqueous solution before being washed and dried and then used for the treatment of produced water containing a multi-component mixture of P-Nitrophenol, Naphthalene, Acenaphthene and Pyrene, using batch adsorption method at varying temperatures (40-60 °C). Thermodynamic parameters, such as Gibb's Free Energy (?G), Enthalpy Change (?H), Entropy Change (?S), Isosteric Heat of Adsorption (?Hx), Activation Energy (Ea), Sticking Probability (S*), Surface Coverage (?) and Hopping Number (n) were calculated, which are indicators of the possible nature of adsorption. The most suitable adsorption temperature was 40 ?C with maximum adsorption capacities of 3.2, 4.5, 4.6 and 4.9 mg/g and the corresponding removal efficiency of 61.81, 81.03, 84.39 and 76.08 %, were obtained for P-Nitrophenol, Naphthalene, Acenaphthene and Pyrene respectively. The ?H, ?S, Ea and S* values were -3694.58, -27102.81, -37004.78 and -138353.27 kJ/mol; -3.1261, -66.5652, -95.7690 and -407.4775kJ/mol; -3694.58, -27102.81, -37004.78 and -138353.274 gmol-1; and 1.4565, 3.0010 X 103, 1.0061 x 105 and 1.9284 X 1021 for P-nitrophenol, Naphthalene, Acenaphthene and Pyrene respectively. These values confirm that the adsorption process is favourable and endothermic.