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All Journal Indonesian Journal of Chemical Studies (Indones. J. Chem. Stud.) Sorption Studies
Dwi Putra Wijaya
Department of Chemistry, Sam Ratulangi University, Manado 95115, Indonesia
Chemical Engineering, Chemistry & Bioengineering Chemistry Materials Science & Nanotechnology

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Kinetic Study of Mg(II) Adsorption on Activated Coal Bottom Ash Dwi Putra Wijaya; Chairil Anwar; Rahmat Basuki; Sultan Napoleon; Mayang Fauziah Putri Kuntjahjono
Sorption Studies Vol. 1 No. 1 (2025): Sorption Studies, Vol. 1 No. 1 June 2025
Publisher : Indonesian Scholar Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55749/ss.v1i1.77

Abstract

The research of sadsorption of Mg(II) ions on coal bottom ash as adsorbent has been carried out. The research was conducted by activating the coal bottom ash using concentrated HCl. Characterization of activated coal bottom ash was done by using Fourier Transform Infra-Red (FTIR) spectroscopy and X-Ray Difraction (XRD) analysis. Parameters of metal adsorption examined in this study include the effect of pH, mass of adsorbent, and interaction time. The concentration of each metal ion remaining in the solution after adsorption and desorption was determined using atomic absorption spectrophotometer. The result showed that activated coal bottom ash has been carried out. The optimum conditions for Mg(II) adsorption using 0.3 g coal bottom ash are at pH 5 with 60 minute contact. The Adsorption kinetics follow Ho model pseudo-second order with the rate constant 0.6182 and 0.998 correlation coefficient. These results highlight the potential of activated coal bottom ash as a low-cost, effective adsorbent for water treatment applications.
Adsorption-Desorption of Cd(II) and Mg(II) Ions by Dithizone-Immobilized Coal Bottom Ash Dwi Putra Wijaya; Ridho Bonaventura; Nurharis Munandar; Fajar Hutagalung; Chairil Anwar
Indonesian Journal of Chemical Studies Vol. 4 No. 2 (2025): Indones. J. Chem. Stud. December 2025
Publisher : Indonesian Scholar Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55749/ijcs.v4i2.76

Abstract

Dithizone-immobilized coal bottom ash (DICBA) was successfully prepared as Cd(II) and Mg(II) adsorbent. The parameters examined in the metal ion adsorption study included the effect of pH, adsorbent mass, contact time, and initial concentration. Sequential desorption was examined using H2O, KNO3, HNO3, and Na2EDTA. The results showed that dithizone had been successfully immobilized on the activated coal bottom ash, as verified by FTIR spectroscopy and XRD analyses. Specific wavenumbers observed included the aromatic group C=C at 1496 cm-1, the C-N group at 1319 cm-1 and the Si-O-Si at 1087 cm-1 with d-spacing values of 8.313 and 6.046 Å. The optimum conditions for adsorption were 60 min for Cd(II) and 90 min for Mg(II) at a pH of 5 with 0.2 g of adsorbent mass, and an initial concentration of Cd(II) at 50 ppm. The adsorption kinetics of Cd(II) and Mg(II) followed the Ho pseudo-second-order model with 0.174 and 0.285 (g/mol·min) rate constants for Cd(II) and Mg(II), respectively. The highest correlation coefficients (R2) were 0.995 for Cd(II) and 0.999 for Mg(II). Isotherm modeling indicated that the adsorption of Cd(II) best fitted the Langmuir model (R² = 0.988), followed by the Dubinin–Radushkevich (R² = 0.952), Freundlich (R² = 0.843), and Temkin (R² = 0.827) models. The desorption mechanism for Cd(II) and Mg(II) was formed by various interactions, such as physical mechanism (28.25% and 26.26%), ion exchange (23.13% and 14.15%), hydrogen bond formation (16.90% and 12.11%), and the mechanism of complex formation (9.56% and 6.13%).
Co-Authors Chairil Anwar Chairil Anwar Fajar Hutagalung Mayang Fauziah Putri Kuntjahjono Nurharis Munandar Rahmat Basuki Ridho Bonaventura Sultan Napoleon