Bisphenol A Removal from Aqueous Solution Using Waste Agarwood Activated Carbon: Kinetic and Isotherm Investigation of Adsorption Process
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Publication date: 2019-11-06
Eurasian J Anal Chem 2019;14(4):emEJAC-00351
Presently, it is difficult to prepare inexpensive water pollutant adsorbents of promising efficiency based on natural source-derived activated carbons (AC). This work investigated the properties of agarwood-synthesised AC (agar AC) of high potential. Displaying an expansive surface area, this carbon was examined in terms of its kinetics and isotherms associated with adsorption of bisphenol A. The preparation of agar AC involved a three-stage process of chemical activation, comprising carbonisation, treatment with sulphuric acid and activation, with agarwood branch serving as precursors. The highest BET surface area of the synthesised agar AC was 1092 m2/g, while the highest absorptivity of the activated carbon under conditions of 50°C, three hours, pH 7 and 1 wt. % carbon dosage was 430 mg/L. Exhibiting an endothermic and spontaneous character, adsorption was observed to comply with the pseudo-second-order with Langmuir and Freundlich adsorption isotherms. In the context of water purification, bisphenol A adsorption could be adequately and inexpensively achieved with this agar AC, which can also be used again following a renewal with great effectiveness of extraction.