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STUDI ADSORPSI ION-ION LOGAM DIVALEN Ca2+, Cu2+, DAN Cd2+ DALAM LARUTAN OLEH BIOMASSA ALGA Dunaliella sp
Abstrak Bahasa Indonesia STUDI ADSORPSI ION-ION LOGAM DIVALEN Ca2+, Cu2+, DAN Cd2+ DALAM LARUTAN OLEH BIOMASSA ALGA Dunaliella sp Oleh Widya Afriliani Wijaya Pada penelitian ini telah dilakukan uji adsorpsi ion Ca2+, Cu2+, dan Cd2+ pada biomassa alga Dunaliella sp. Variabel-variabel yang dikaji dalam penelitian ini meliputi dosis biomassa alga sebagai adsorben, pH, dan waktu interaksi optimum serta konsentrasi awal logam yang diinteraksikan dengan adsorben. Adsorpsi ion Ca2+, Cu2+, dan Cd2+ dengan biomassa alga dilakukan menggunakan metode batch. Biomassa alga Dunaliella dikarakterisasi menggunakan spektofotometer inframerah (IR) dan kadar ion logam yang terserap dianalisis dengan spektrofotometer serapan atom (SSA). Proses adsorpsi ion Ca2+, Cu2+, dan Cd2+ pada biomassa alga Dunaliella sp optimum pada pH 4. Data adsorpsi dianalisis untuk menentukan kinetika dan isoterm adsorpsi. Kinetika adsorpsi ion Ca2+, Cu2+, dan Cd2+ cenderung mengikuti model kinetika orde 2 dengan konstanta laju untuk ion Ca2+, Cu2+, dan Cd2+ masing-masing sebesar 0,28; 1,25; 2,10 g mg-1 menit-1. Isoterm adsorpsi ion Ca2+, Cu2+, dan Cd2+ dengan biomassa Dunaliella sp cenderung mengikuti model isoterm adsorpsi Langmuir dengan kapasitas adsorpsi ion Ca2+, Cu2+, dan Cd2+ masing-masing 8,35; 16,76; 43,23 mg g-1. Kata kunci : Dunaliella sp, kinetika adsorpsi, isoterm adsorpsi Abstrak Bahasa Inggris THE ADSORPTION STUDY OF DIVALENT METALS ION Ca2+, Cu2+, AND Cd2+ IN SOLUTIONS USING ALGAE BIOMASS Dunaliella sp By Widya Afriliani Wijaya In this research, it has been performed adsorption process of Ca2+, Cu2+, and Cd2+ ions by the use of algae biomass Dunaliella sp. Several variables were evaluated, these include dosages of algae biomass as adsorbent, pHs, interaction times, and the initial concentration of ions which was interacted with adsorbent and the adsorption process used in this research was batch process. Algae biomass of Dunaliella sp was characterized by spectrophotometer infrared (IR) and concentration of ions was analyzed using absorption atomic spectrophotometer (AAS). Optimum condition from adsorption process of Ca2+, Cu2+, and Cd2+ ions using algae biomass Dunaliella sp was obtained at pH 4. Adsorption data of experiments were used to determine the adsorption kinetics and adsorption isotherm. Adsorption kinetics for Ca2+, Cu2+, and Cd2+ ions follows pseudo order 2 with rate constants (g mg-1 min-1) of 0.28, 1.25 and 2.10 for Ca2+, Cu2+ and Cd2+, respectively. Adsorption isotherm of Ca2+, Cu2+, and Cd2+ ions using Dunaliella sp obeys Langmuir adsorption isotherm with adsorption capacity (mg g-1) of 8.35, 16.76 and 43.23 for Ca2+, Cu2+ and Cd2+, respectively. . Keywords : Dunaliella sp, adsorption kinetics, adsorption isotherm
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