Abstract
ABSTRACT The current study mainly deals with the adsorptive removal of the diclofenac sodium (DS) drug from aqueous solution by the use of the kaolin-CS-g-poly(AA-co-NIPAM) composite. The synthesised composite was characterised by Fourier Transform infrared (FTIR), X-ray diffraction (XRD), Field emission scanning electron microscopy (FESEM), thermogravimetric analysis (TGA), Transmission electron microscopy (TEM), energy dispersive X-Ray spectroscopy (EDS), atomic force microscopy (AFM), swelling % ratio and point of zero charge ( p H PZC ). The pHpzc of the composite was determined to be 4. The maximum adsorption capacity of 18.51 mg/g observed at the optimised conditions, including 0.1 g of kaolin clay dose, at neutral pH using composite dose of 0.06 g for 90 min. The optimum drug concentration was 500 mg/l for temperature of 30°C. Effect of the ionic strength on the adsorption capacity of the composite and its mechanism for DS drug removal has also been investigated. The process of drug adsorption on the prepared composite was chemical and data fits well to the pseudo second order and Langmuir model. Overall, the process was spontaneous and endothermic in nature.
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