Journal
DESALINATION AND WATER TREATMENT
Volume 142, Issue -, Pages 331-340Publisher
DESALINATION PUBL
DOI: 10.5004/dwt.2019.23533
Keywords
Porphyridium sp.; Algae-silica-magnetite hybrid; Adsorption; Methylene blue
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Funding
- Directorate of Research and Community Service, Directorate General for Research and Development, Ministry of Research, Technology and Higher Education of the Republic of Indonesia [062/SP2H/LT/DPRM/2018]
- Technology Innovation Center University of Lampung (UPT Laboratorium Terpadu dan Sentra Inovasi Teknologi-Universitas Lampung)
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Algae-silica (AS) hybrid material from biomass Porphyridium sp. has been modified by coating Fe3O4 particles (MPs) via a sol-gel process using tetraethyl orthosilicate to produce algae-silica-Fe3O4 (AS-MPs). The AS-MPs produced were applied as adsorbent for the adsorption of methylene blue (MB). Identification of functional groups was performed by infrared spectrometer indicating that in AS-MPs there were active organic groups derived from Porphyridium sp., silanol and siloxane. Diffraction pattern of the AS-MP material analyzed by X-ray diffraction showed that the material has higher peak intensities at 2 theta = 30.04 degrees and 35.52 degrees. Analyst results using a particle size analyzer showed that the average particle size distribution of the AS-MP material was 1.40 mu m. In addition to the results of the analysis using scanning electron microscopy, material of AS-MPs has a more heterogeneous surface morphology. The models of MB adsorption by AS and AS-MP tend to follow the pseudo-second-order kinetic model and Freundlich adsorption isotherm. The adsorption of MB solution by AS-MP produces rate constants (k(2)) of 0.003 g mg(-1) min and adsorption capacity (q(m)) of 96.927 mg g(-1) under the experimental conditions of dose of adsorbent of 2.5 mg L-1, interaction pH of 6, contact time of 60 min, and temperature of 27 degrees C. The AS-MP material obtained from the results of this study can be used as an effective adsorbent because it can remove MB dyestuff in solution, it is chemically stable in acidic and neutral media, and it can be used repeatedly.
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