Utilization of Various Zeolites from Fly Ash as Sorbents For Amoxicillin and Clindamycin Maryono, Budiman Anwar, Galuh Yuliani*
Chemistry Study Programme, Universitas Pendidikan Indonesia, Bandung, Indonesia
*Galuh[at]upi.edu
Abstract
The performance of four zeolites prepared from fly ash (ZFA), namely Z1 1:2 (ZFA-Zeolite F & ECR-10), Z2 1:2,5 (ZFA-Gismondine), Z3 1:2 (ZFA-Gismondine & Faujasite), and Z4 1:2,5 (Gismondine) was evaluated for the removal of two antibiotics, namely amoxicillin and clindamycin from aqueous solutions. Zeolite samples were prepared using the hydrothermal method. Fly ash was autoclave at 95°-C, washed, dried in an oven at 50°-C and 95°-C for 9,11,15 hours. and then sieved using a 100 mesh sieve. The characterization of zeolite was carried out using XRD analyses. The concentrations of amoxicillin and clindamycin were measured using UV-VIS spectroscopy. The adsorption study was carried out using a batch method with a time variation of 30, 60, 90, 120, and 150 minutes. Determination of optimum pH was conducted with a variation of pH 2.01- 4.40- 6.70- 9,92- 12,02 for amoxicillin and pH 2.32- 5.65- 7,82- 9.93- 12.03 for clindamycin. To study the adsorption mechanism, the adsorption data were plotted using Langmuir, Freundlich, and BET isotherms. The optimization results show that the optimum contact time was at 120 minutes for both amoxicillin and clindamycin. The optimum pH was found to be 12.02 for amoxicillin and pH 7,82 For clindamycin. The adsorption data follows the Langmuir isotherm model with a correlation coefficient (R2) for Z2-AMX and Z4-CLM were 0.990 and 0.994 respectively. The maximum adsorption capacity for Z2-AMX and Z4-CLM was 44.843 mg/g and 22.421 mg/g respectively.
