Publication: Adsorption of chloramphenicol and bisphenol a using cellulosic carbonaceous fibrous strand adsorbent
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Date
2022-04-01
Authors
Ahammad, Nur Azian
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Abstract
Recently, the problem of water contamination due to organic compounds residues detected in natural wastewater streams has become more alarming. These pollutants are referred to as new emerging pollutants. New emerging pollutants such as Chloramphenicol (CPC) and Bisphenol A (BPA) have been discovered in many water resources. This study aims to synthesis carbonaceous fibrous strand adsorbent (CFSA) via Schweitzer’s reagents for the adsorption of CPC and BPA from aqueous solution. CFSA had a surface area of 650.921 m2.g-1 , a total pore volume of 0.485 cm3.g-1 and an average pore diameter of 2.930 nm. Batch and continuous adsorption study were conducted for the removal of CPC and BPA. The maximum adsorption capacity, Qmax for CPA and BPA adsorption was 234.03 mg.g-1and 118.97 mg.g-1, respectively at 50 °C. For both adsorption systems, the kinetics of adsorption followed a pseudo-second-order kinetic model. The adsorption diffusion behaviour was evaluated by intraparticle diffusion. Based on the Boyd plots, the adsorption of CPC and BPA onto CFSA was mainly governed by film diffusion. Thermodynamic findings demonstrated that CPC and BPA adsorption onto CFSA were spontaneous and
endothermic in nature. Next, the adsorption profile for both CPC and BPA were best fitted Freundlich isotherm models, suggesting a heterogonous adsorption surface for both systems. From the isotherm, kinetic and thermodynamic results, we can conclude that a combination of chemisorption and physisorption takes place, i.e., physicochemical adsorption is involved in adsorption of CPC and BPA. The fixed-bed adsorption profile for CPC and BPA system were fitted well to Thomas and Yoon-Nelson.