Abstract

K. Veeravelan¹ , S. Arivoli^1* and J. Samu Solomon²

DOI : http://dx.doi.org/10.13005/ojc/380518

The adsorption characteristics study on the removal of therapeutic drug naproxen on the acid digested carbon of waste leather were analysed by varying the physico-chemical conditions. Effect of particle size, adsorbent dosage, pH, temperature, initial concentration of adsorbate and contact time were analysed carefully by batch mode. The minimum particle size gives maximum number of surface area and adsorbed more, 90.89% for 0-63 micron. Acidic pH ranges were desirable for the adsorption of naproxen on this Acid digested carbon of waste Leather (ADCL). But different adsorbates preferred different acidic pH ranges of pH from 1 – 6. Above pH 6 precipitations of drugs takes place. In this case at pH 1, 96.87% of adsorption takes place. The percentage of adsorption of naproxen is directly proportional to the adsorbent dosage and contact time and inversely proportional to the initial concentration of the adsorbate were found out from this study. Order of this adsorption is pseudo second order kinetics and it belongs to the physisorption, because of no chemical bond formation between the adsorbent and adsorbate. The fruendlich and Langmuir isotherm model is fit for these studies. The thermodynamic study reveals the negative ∆Go, positive ∆Ho and ∆So values concluded that this adsorption is spontaneous, feasible and physical in nature respectively. The spectral evidence from the FT-IR, SEM and XRD are in favour of above experimental results.

Adsorption; Isotherm; Kinetics; Spectrum; Therapeutic drugs; Thermodynamics

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