Abstract
Various technologies have been developed to reduce heavy metal content in the wastewater. The biosorption method is a technique that is widely applied because it is cheap, environmentally friendly, and has high efficiency. This study aims to ascertain the potential of dry biomass of microalgae Aphanothece sp. as a biosorbent of Cu (II) ions in synthetic wastewater and determine the appropriate biosorption kinetics model. Analysis of Cu (II) ion concentrations was carried out using Atomic Absorption Spectrophotometer (AAS). The results showed that the optimum conditions for the biosorption process were at pH 4, and the contact time was 210 minutes with the removal efficiency of Cu (II) ions reaching 80.02%. The results of tests on the adsorption isotherm model showed that the biosorption process of Cu (II) ions using dry biomass biosorbent Aphanothece sp. follows the Freundlich isotherm model with an R 2 value of 0.9962.
Highlights
Abstrak: Berbagai teknologi telah dikembangkan untuk mengurangi kandungan logam berat pada air limbah
This study aims to ascertain the potential of dry biomass of microalgae Aphanothece sp. as a biosorbent of Cu (II) ions in synthetic wastewater and determine the appropriate biosorption kinetics model
The results showed that the optimum conditions for the biosorption process were at pH 4, and the contact time was 210 minutes with the removal efficiency of Cu (II) ions reaching 80.02%
Summary
Biomassa mikroalga dipisahkan dengan menggunakan sentrifugasi pada 6000 rpm selama 10 menit. Biomassa kemudian dikeringkan pada suhu 60°C dalam oven selama tujuh hari dan kemudian dihaluskan dengan menggunakan cruser dan diayak melalui jaring ukuran 45 mesh (berdiameter sekitar 354 μm). Biomassa kering yang diperoleh disimpan dalam wadah tertutup dan digunakan sebagai biosorben pada penelitian ini. Pembuatan Larutan Tembaga Larutan tembaga (II) 1000 ppm dibuat dengan melarutkan 0,5 g serbuk logam tembaga dengan menggunakan 10 mL HNO3 pekat, setelah larut ditambahkan dengan akuades hingga volume 500 mL. Konsentrasi larutan tembaga yang digunakan adalah 5 ppm, 10 ppm, 15 ppm, 20 ppm, 25 ppm dan 30 ppm
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