| Abstrakt: |
Wastewater containing polycyclic aromatic hydrocarbons (PAHs), when improperly managed or released into the environment, can disrupt the ecosystem and degrade the quality of water bodies. Wastewater that contains PAHs needs to be treated immediately. Bagasse was pyrolyzed in this work to produce alternate biochar, which was subsequently CO2-activated. CO2-activated and non-activated biochar were characterized and evaluated for adsorption of naphthalene from an aqueous solution. Thermodynamics, equilibrium, and adsorption kinetics studies were conducted. Contrary to non-activated biochar, which had a surface area of less than 71 m2/g, CO2-activated biochar was a typical mesoporous material with a surface area of roughly 263 m2/g. Therefore, compared to non-activated biochar, CO2-activated biochar has a more significant potential for naphthalene adsorption. CO2-activated and non-activated biochar had maximal naphthalene adsorption capacities of 290.43 and 38.15 mg/g, respectively. According to the findings, both feedstocks achieved the optimal adsorption capacity at pH 7, and 0.2 g of adsorbent at 120 and 180 min for activated and non-activated biochar, respectively. Naphthalene adsorption on CO2-activated biochar proceeded according to the pseudo-second-order model's kinetics. For CO2-activated biochar, with consideration to the equilibrium adsorption isotherms, Langmuir offered the best match. Physical modification considerably enhanced the adsorption of naphthalene onto CO2-activated biochar. Naphthalene and biochar were able to bind to one another by physical interaction, electrostatic attraction, hydrogen bonds, and π–π interaction. Naphthalene adsorption on CO2-activated biochar was spontaneous, exothermic, and favorable. Hence, modified biochar (CO2-activated) has the potential to produce a substitute mesoporous adsorbent from bagasse to remediate naphthalene from wastewater. [ABSTRACT FROM AUTHOR] |
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