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Determination of Kinetic and Thermodynamic Parameters of Pb(II) Ion Adsorption Using Dithizone-Immobilized Coal Fly Ash Rizal B., Muh; Mudasir, Mudasir; Siswanta, Dwi; Muharmi, Melvi; Ardina, Vebria; Setyawan, Teguh; Jaya, Nur; Permatasari, Defia Indah; Tanjung, Revi Maylina
Jurnal Kimia Sains dan Aplikasi Vol 29, No 1 (2026): Volume 29 Issue 1 Year 2026
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.29.1.1-9

Abstract

The immobilization of dithizone on the surface of coal fly ash was successfully achieved, as evidenced by Fourier-transform infrared (FT-IR) and X-ray diffraction (XRD) characterization. The dithizone-immobilized coal fly ash (CFA-Dzt) was then used for Pb(II) ion adsorption. The parameters studied included the effects of pH, kinetics, and thermodynamics on Pb(II) ion adsorption using a batch experimental system. The results showed that the optimum pH for Pb(II) adsorption using CFA-Dzt was 5. The adsorption kinetics of Pb(II) ions followed the pseudo-second-order kinetic model, with an adsorption activation energy of 27.280 kJ mol−1. The Langmuir isotherm model best described the adsorption behavior, with a maximum adsorption capacity of 34.13 mg g−1. Thermodynamic analysis revealed Gibbs free energy changes (ΔG°) of 24.630, 25.850, 26.810, and 28.550 kJ mol−1 at 293, 303, 313, and 323 K, respectively. The enthalpy change (ΔH°) of the adsorption at this temperature range was +12.770 kJ mol−1, indicating that Pb(II) ion adsorption on the adsorbent is an endothermic process, and its entropy change (ΔS°) was +127.290 J mol−1, suggesting that the adsorption of Pb(II) ion on CFA-Dzt is dominantly driven by the entropic factor.
Co-Authors Adelin, Muhammad Ady Ferdian Noor Aflizah, Nur Agustiar agustiar ALGUSYAIRI, PARISYI Amyus, Randi Saputra Angglina, Novita Anjar Purba Asmara Ardina, Vebria Astari, Siti Alysha Asteriniah, Femi As’ari, As’ari Bambang Rusdiarso BUDI SETIADI DARYONO Busra, Aminudin Dahrani, Dahrani Dalillah, Aupi Dari, Sri Wulan Darto Darto Defia Indah Permatasari Desi Arisandi Dinata, Yuriyan Dwi Siswanta Edi Suharyadi Fadel, Moh. Fani, Tedy Dwi Fitriana, Dina Fitriyadi, Muhammad Habib Abdullah, Habib Hafis, Gustianto Nur Hamami, Abdul Rasyid Hartono Hartono Heryanto, Edi Hidayat, Rizki Icuk Muhammad Sakir Indrawan, Tiwa Junio Iriani, Atrika Itasaiyah, Itasaiyah JAYA, NUR Khairunnisa, Aulia Liyadi, Muslim Lubis, Nasib Samsuri Madaniyah, Madaniyah Mardhiyah, Mardhiyah Mardiah Mardiah Mardianto Mardianto Mat Syuroh Mawar Mawar, Mawar Melvi Muharmi Muharriyadi, Muharriyadi Muhtady, Dedi Musdiani Musdiani Muti'ah, Siti Nangim, Ngainun Nuniek Herdyastuti Nurhafizah Nurhafizah Nurhasanah Nurhasanah Nurul Hidayat Aprilita Nurwijayanti Rahmawan, Arsuwandika Ramadhan, Muhammad Rizki Rizadiliyawati, Rizadiliyawati Rizal B., Muh Rohadi Rohadi Rohaini, Yespi Romadhona, Miftakhul Romodhon, M Iqbal Roto Roto RR. Ella Evrita Hestiandari S, Rayani V Sabirin Matsjeh Sahrizal, M. Rinaldi Saifuddin Saifuddin Saputra, Aliyus Saputra, Ramli Saputri, Eki Nining Sari, Dwi Nofika Saswita, Saswita Septiani, Iga Setyawan, Teguh Shihabuddin, Ahmad Sibarani, Yetti Erika Sri Juari Santosa SRI RAHAYU Sri Sunarsih Suherman, Suherman Susiana, Carissa Ayu Sutinah Sutinah Syuhada Syuhada Tanjung, Revi Maylina Thahir, Musa Titin Aryani Tjoa, Stanley Evander Emeltan Tri Gunawan, Tri Tri Joko Raharjo Utomo, Edi Yovianti, Ice Veronika Zainuddin, Abdul wahid Zaitun Zaitun Zofir, Tasrif Zuanda, Sary