Alvika Meta Sari, Irfan Purnawan, Erdawati
The use of the chemical flocculants can cause health and environmental problems. The alternative bio-flocculants is chitosan. In this study, the chitosan was prepared as flocculants for harvesting the microalgae chlorella sp. The aim of this research is to investigate the flocculation behavior and mechanism of a chitosan. Chitosan, nanopartikel chitosan and chitosan magnetite were prepared as a flocculant. Nanoparticle chitosan was prepared by crosslinking reaction with Sodium Tri Poly Phospat (STPP). The chitosan magnetite was prepared using iron (III) chloride and iron (II) chloride. Various concentrations (25, 50, 75 and 100 mg/L) of chitosan were tested. The Fourier Transform Infrared spectrometry (FTIR) showed that the FTIR spectra of nanoparticle chitosan the peak of 1655 cm-1 disappear and 2 new peaks at 1645 cm-1 and 1554 cm-1 appears. The transmission electron microscopy (TEM) identified the average diameter of particles was about 23.08 -61.54 nm. The magnetic property of the obtained magnetic composite nanoparticles was confirmed by X-ray diffraction (XRD) and FTIR. The saturated magnetisation reached 21.5 emu/g. The flocculation efficiencies of three flocculants were investigated. The effect of chitosan dose on harvesting efficiency of Chlorella sp was also investigated. Results showed that Chitosan nanomagntite was the best flocculants in their category in terms of flocculation efficiency at 98 % floc rate. The higher floc rate was conducted at 100 mg/l of chitosan nanomagnetite. © 2006-2016 Asian Research Publishing Network (ARPN).
Department of Chemical Engineering, UMJ, Jl.Cempaka Putih Tengah, Jakarta, Indonesia; Department of Chemistry, State University of Jakarta, Jl. Pemuda, Jakarta, Indonesia
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