BIOSORPTION OF PHENOL USING MODIFIED BARLEY HUSK: STUDIES ON EQUILIBRIUM ISOTHERM, KINETICS, AND THERMODYNAMICS OF INTERACTIONS

Authors : Davoud BALARAK, Kethineni CHANDRIKA, Chinenye Adaobi IGWEGBE, Shahin AHMADI, Chinedu Josiah UMEMBAMALU

Pages : 1161-1177

View : 36 | Download : 9

Publication Date : 2021-10-05

Article Type : Research Paper

Abstract :Phenol insert ignore into journalissuearticles values(PHEN); adsorption using hydrogen chloride insert ignore into journalissuearticles values(HCl); modified barley husk insert ignore into journalissuearticles values(MBH); was studied, in which the effects of MBH dose insert ignore into journalissuearticles values(0.5-4 g/L);, initial pH insert ignore into journalissuearticles values(3-11);, contact time insert ignore into journalissuearticles values(10-180 min);, and initial PHEN concentration insert ignore into journalissuearticles values(10-100 mg/L); were investigated. The adsorbent material was prepared via the chemical activation method. The MBH morphological properties with the surface chemistry characteristics were studied through the Brunauer-Emmett-Teller insert ignore into journalissuearticles values(BET); surface area, scanning electron microscopy insert ignore into journalissuearticles values(SEM);, Energy Dispersive Xray Microanalysis insert ignore into journalissuearticles values(EDX);, Fourier-transform infrared insert ignore into journalissuearticles values(FTIR);, and point of zero charge insert ignore into journalissuearticles values(pHpzc); analyses. The data was examined using the four common models of isotherm insert ignore into journalissuearticles values(Freundlich, Langmuir, Dubinin-Radushkevich insert ignore into journalissuearticles values(D-R);, and Temkin);. The pseudo-first-order, pseudo-second-order, and the intra-particle diffusion models were also used to examine the data. Thermodynamics parameters: free energy change insert ignore into journalissuearticles values(ΔGo);, enthalpy change insert ignore into journalissuearticles values(ΔHo); and entropy change insert ignore into journalissuearticles values(ΔSo); were evaluated. MBH was highly efficient due to its high surface area insert ignore into journalissuearticles values(176.2 m2/g);. Maximum removal of PHEN insert ignore into journalissuearticles values(93.95%); occurred at pH 3, MBH dose: 3 g/L, PHEN concentration: 10 mg/L, and contact time: 180 min at a constant temperature of 30 ± 2 ºC. The D-R isotherm and pseudo-second-order best represented the isotherm and kinetic data, respectively. The values of ΔGo insert ignore into journalissuearticles values(-0.056, -0.613, -1.431, -2.052, -2.941 and -3.731 kJ/mol);, ΔHo insert ignore into journalissuearticles values(23.88 kJ/mol); and ΔSo insert ignore into journalissuearticles values(0.087 kJ/mol K); indicate a feasible, spontaneous and endothermic adsorption process. MBH, a low-cost adsorbent can be used effectively to remove PHEN from PHEN-containing water.
Keywords : Phenol, barley husk, adsorption, iotherms, thermodynamics, kinetics

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