Abstrak: Kulit buah kapuk (Ceiba pentandra L) merupakan limbah pertanian yang belum dioptimalkan sampai sekarang. Penelitian biosorpsi Pb(II) dan Cd(II) menggunakan biosorben kulit buah kapuk telah dilakukan dengan metoda batch. Parameter yang dipelajari untuk penentuan kondisi optimum yaitu pH, konsentrasi awal, waktu kontak, massa biosorben dan ukuran partikel. Biosorben terlebih dahulu diaktivasi dengan HNO3 0,01 M. Kondisi optimum biosorpsi diperoleh pada pH 4, waktu kontak 15 menit, massa biosorben 0,025 g dan ukuran partikel ≤25 µm kedua ion logam, sedangkan konsentrasi awal larutan 1200 mg/L untuk Pb(II) dan 1000 mg/L untuk Cd(II). Studi isotherm adsorpsi mengikuti model isoterm Langmuir dengan koefisien determinasi (R 2 ) 0,9983 untuk Pb(II) dan 0,9892 untuk Cd(II). Kinetika adsorpsi mengikuti model pseudo orde dua yang menunjukkan bahwa adsorpsi terjadi secara kimia. Karakterisasi menggunakan FTIR menunjukkan bahwa biosorben mengandung gugus fungsi seperti -OH, dan -C=O yang berperan dalam proses biosorpsi, sedangkan karakterisasi menggunakan SEM menunjukkan adanya poripori biosorben sebelum menyerap ion logam dan poripori akan tertutup setelah menyerap ion logam. Kapasitas adsorpsi Pb(II) sebesar 223,72 mg/g dan Cd(II) 88,7 mg/g. Hal ini menunjukkan bahwa kulit buah kapuk merupakan biosorben potensial dengan biaya rendah dalam menyerap Pb(II) dan Cd(II). Abstract: Kapok husk (Ceiba pentandra L)is an agricultural waste that has not been optimized currently. Biosorption of Pb(II) and Cd(II) using Kapuk husk was studied by batch method. Biosorbent was activated by HNO3 0.01 M. The parameters studied for determining optimum conditions were pH, initial concentration, contact time, biosorbent mass and particle size.The optimum conditions for biosorption were obtained at pH 4, contact time15 minutes, biosorbent dosage 0.025 g and particle size ≤25 µmfor both metal ions, while initial concentration for Pb(II) was 1200 mg/L and Cd(II) was 1000 mg /L. The study of adsorption isotherm followed the Langmuir isotherm model with a determination coefficient (R 2 ) 0.9983 for Pb(II) and 0.9892 for Cd(II). Adsorption kinetics followed second order pseudo model which showed that adsorption occurs chemically. Characterization using FTIR showed that biosorbent contained the -OH and -C=O functional group which played a role in the biosorption process, while SEM characterization showed biosorbent pores before absorbing metal ions and the pores would be closed after absorbing.The adsorption capacity of Pb(II) was 223.72 mg / g and Cd(II) was 88.7 mg/g. This shows that Kapuk husk is a potential biosorbent with low cost in absorb Pb (II) and Cd(II).
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