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Yunus Fransiscus
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Chemical Engineering, Chemistry & Bioengineering Environmental Science

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PROSES BIOSORPSI CU DAN PHENOL DALAM KONDISI TUNGGAL MAUPUN SIMULTAN DENGAN MENGGUNAKAN LUMPUR AKTIF KERING Yunus Fransiscus
Purifikasi Vol 8 No 1 (2007): Jurnal Purifikasi
Publisher : Department of Environmental Engineering-Faculty of Civil, Environmental and Geo Engineering. Institut Teknologi Sepuluh Nopember, Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25983806.v8.i1.116

Abstract

The application of dried activated sludge as a biosorbent for copper and phenol was studied. From a series of batch experiment for single component, it was determined the sorption capacity of biosorbent are 29 mg/L and 98 mg/L for copper and phenol respectively. Sorption isotherm showed that these two adsorbates have different sorption mechanism. copper was able to form a more complete monolayer, while phenol tend to form a multilayer reaction. In simultaneous experiments it was concluded that phenol was more dominant than copper. The sorption capacity of biosorbent for copper decreased gradually as the increasing of phenol concentration. This condition was not reversible, sorption capacity of biosorbent for phenol was more stable. eventhough copper concentration was increased.
KINERJA BENTONIT TERINTERKALASI HDTMA DAN KOMPOSIT BENTONIT KITOSAN SEBAGAI ADSORBEN UNTUK FENOL DAN METILEN BIRU Yunus Fransiscus
Purifikasi Vol 12 No 1 (2011): Jurnal Purifikasi
Publisher : Department of Environmental Engineering-Faculty of Civil, Environmental and Geo Engineering. Institut Teknologi Sepuluh Nopember, Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25983806.v12.i1.216

Abstract

A series of modification process to bentonite was done to obtain HDTMA intercalated bentonite and bentonite-chitosan composites. These two materials were applied as adsorbent for methylene blue and phenol removal. Suspension of 1% HDTMA-Cl surfactant and bentonite was made from bentonite/water ratio of 20g/100mL, with pH adjustment, warming, precipitation, and washing processes. About 5 g of bentonite was mixed with 1% v/v acetic acid and deacetilated chitosan. After being stirred within 12 hours, the solution was washed, filtered, and dried. Phenol and methylene blue adsorbates were prepared as stock solution. The required concentrations were prepared by diluting the mother liquors with aquadest. The experiment was conducted in batch system using OMNIFIT adsorption column. The solution was recirculated from the adsorption column to the reservoir tank. The feeding flow rate and the amount of adsorbent were set constant at a flow rate of 1 mL/min. Initial concentrations of phenol and methylene blue were varied from 10 to 250 mg/L. Sampling was done every 5 minutes in the first 30 minutes, and continued every 15 minutes, until the system reached equilibrium state. Sample analyses were carried out by using UV-spectrophotometer. The results showed that the bentonite-chitosan composite had higher phenol and methylene blue adsorption capacity than that of the HDTMA intercalated bentonite. The adsorption capacities of bentonite-chitosan composites were 65 mg/g and 95 mg/g for phenol and methylene blue respectively. Whereas, HDTMA intercalated bentonite showed adsorption capacities of 35 mg/g for phenol and 38 mg/g for methylene blue. Freundlich model was most appropriate with the obtained data. This model explained that interaction between adsorbent and adsorbate were mainly influenced by physical reaction.
UJI INTERAKSI KIMIAWI PADA PROSES SORPSI ESCHERICHIA COLI DALAM KONDISI JENUH Yunus Fransiscus
Purifikasi Vol 7 No 2 (2006): Jurnal Purifikasi
Publisher : Department of Environmental Engineering-Faculty of Civil, Environmental and Geo Engineering. Institut Teknologi Sepuluh Nopember, Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25983806.v7.i2.256

Abstract

A study to describe the sorption characteristic of Escherichia coli was carried out in dynamic column experiments. Iron coated sand was used as the collector and phosphate was used to evaluate the attachment mechanism. The hypothesis that ligand exchange played significant role in the attachment mechanism was supported by observation of several phenomena: pH increase during the process, less detachment during the desorption, no significant effect of ionic strength and pH of the solution, and less attachment of E. coli in competition with phosphate. However, from the breakthrough curves it was indicated that ligand exchange was not the only process involved. The results gave an indication that bacterial retention in solid-liquid interface can be explained beyond the DLVO theory.
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