Browsing by Author "Ezeiheukwu, Chika Mary"

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    The adsorption of 4-chlorophenol and hydroquinone from aqueous solution onto activated shells of oil bean seed
    (Federal University of Technology, Owerri, 2024-04) Ezeiheukwu, Chika Mary
    Oil bean seed shell (OBSS) activated carbon was investigated for adsorption of 4-Chlorophenol and Hydroquinone in aqueous solution. The effects of pH, contact time, initial concentration and temperature were evaluated. Adsorption increased as the contact time increased with the optimum Adsorption at 50 minutes (for ZnCl2 activated carbon) and 40 minutes (for H3PO4 activated carbon) for 4-Chlorophenol and Hydroquinone respectively. The influence of pH on 4-Chlorophenol and Hydroquinone uptake by OBSS activated carbons were carried out between pH 4 and pH 10. The level of uptake of 4-Chlorophenol and Hydroquinone by OBSS activated carbon increased at lower pH values studied. The effect of temperature on the uptake of 4-chlorophenol and Hydroquinone were carried out between 29 oC and 60 oC. The result indicated that adsorption increased at low temperature. The adsorption capacity and adsorption intensity for 4-Chlorophenol were calculated to be 0.75 and 1.0 (for ZnCl2 activated carbon), 0.82 and 0.96 (for H3PO4 activated oil bean seed shells) respectively and 0.878 and 1.12 (for ZnCl2 activated oil bean seed shells) and 0.827 and 0.90 (for H3PO4 activated oil bean seed shells). The thermodynamic parameters ∆Go , was calculated to be from -135.70 to -3426.3 jmol-1 k -1 (for ZnCl2 activated carbon shells of oil bean seed, -26.6 to -3073.4 jmol-1 k -1 for H3PO4 activated carbon of oil bean seed shells for 4-chlorophenol removal, from -360.0 to 4156.5 jmol-1 k -1 (for ZnCl2 activated carbon shells of oil bean seed) and from -276.8 to -3526.8 jmol-1 k -1 (for H3PO4 activated carbon shells of oil bean seed) for hydroquinone removal. The enthalpy change (∆H) were calculated to be -3733.7 and -3379.3 for ZnCl2 activated carbon shells of oil bean seed respectively for 4-chlorophenol,and -4700 and -3654 for ZnCl2and H3PO4 activated carbon shells of oil bean seed for hydroquinone removal respectively. The negative ∆Go values of 4-chlorphenol and Hydroquinone at various temperatures were due to adsorption process being spontaneous with respect to 4-chlorophenol and hydroquinone adsorption onto OBSS.