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All Journal PROSIDING SEMINAR KIMIA JURNAL ATOMIK
Daniel Tarigan
Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Environmental Science

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KINETIKA ADSORPSI Cr(VI) MENGGUNAKAN ADSORBEN MAGNETIT (Fe 3 O 4 ) DAN MAGNETIT TERLAPIS ASAM HUMAT (Fe 3 O 4 /AH) Soerja Koesnarpadi; Daniel Tarigan
PROSIDING SEMINAR KIMIA SEMINAR NASIONAL KIMIA 2014
Publisher : PROSIDING SEMINAR KIMIA

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The adsorption kinetics of Cr(VI) by two adsorbents, i.e. magnetite (Fe 3 O 4 ) and magnetite coated humic acids (Fe 3 O 4 /HA) have been studied. Adsorbent of Fe 3 O 4 and Fe 3 O 4 /HA were synthesized by co-precipitation method and then characterized by FT-IR, XRD and TEM image measurements. The acidity of the solution was adjusted to pH 3, comparasion on the adsorption kinetics of Cr(VI) on Fe 3 O 4 between Fe 3 O 4 /HA. The FT-IR spectra revealed the presence of main fuctional groups of Fe-O and C-O at free carboxylate acid in Fe 3 O 4 /HA and those of only Fe-O in Fe 3 O 4 . The two adsorbent had similar diffraction peaks at 2θ. The TEM image demonstaretd that Fe 3 O 4 were spherical in shape and uniform distribution and then Fe 3 O 4 /HA had no uniform size. Adsorption of Cr(VI) by Fe 3 O 4 was much faster than Fe 3 O 4 /HA at the acidity of pH 3, with adsorption rate constant (k) of 0.013 g.mg -1 .menit -1 for Fe 3 O 4 and 0.0062 g.mg -1 .menit -1 for Fe 3 O 4 /HA. The two adsorbents were giving a model of adsorption kinetics Ho (pseudo order 2).
UJI AKTIVITAS SENYAWA ANTIOKSIDAN DARI DAUN ANDONG ( Cordyline Frutycosa (L.) A. Chev. ) DENGAN MENGGUNAKAN METODE DPPH Anton Gunawan; Daniel Tarigan; Ritson Purba
PROSIDING SEMINAR KIMIA SEMINAR NASIONAL KIMIA 2013
Publisher : PROSIDING SEMINAR KIMIA

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Has done antioksidan’s activity test of various fraction one that stem of andong leaf (Cordyline Fruticosa (L.) A. Chev.) that indigenous botanical samarinda’s garden. Andong leaf sample at extraction with etanol then concentrated by rotary evaporator. Extract afterwards ethanol at fraction crude with n-hexane and acetat ethyl. Base of antioksidan activity test with DPPH radical scavenging method by spectrophotometer, showed thet the most active fraction is the fraction of ethylacetate which have antioxidant activity EC 50 = 157.72 µg / mL. It is classified as moderate when compared with vitamin E that has antioxidant activity about EC 50 = 37.3 µg / mL.
PEMBUATAN SABUN DALAM BENTUK POLIOL DARI MINYAK BIJI KELOR (Moringa oleifera) Eka Putri Jayanthy Sihombing; Daniel Tarigan; Saibun Sitorus
JURNAL ATOMIK Vol 1 No 1 (2016)
Publisher : Jurusan Kimia FMIPA UNMUL

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Polyol compounds obtained by epoxidation dan hydroxylation, the results obtained with the reaction yield of 69.23%. Potassium soap mixture in the form of a polyol obtained by saponification polyol with Potassium Hydroxide with a yield of 70.36%. Polyol and potassium soap in the form of a polyol mixture was analyzed by FT-IR spectrophotometer.Respectively iodine from moringa seed oil and polyol are 107.3769 mg I / gram of oil and 4.6755 mg I / gram of oil. HLB of fatty acid potassium soap of moringa seed oil and potassium soap in the form of a mixture of polyol is determined by titration method and obtained HLB of fatty acid potassium soap of moringa seed oil amounted to 5,2178 while the potassium soap in the form of a polyol mixture of 8,4767. Free alkalinity of soap potassium mixture in the form of a polyol is 0.551%. Based on the stability and strength of the foam test, the concentration of potassium soap mixture in the form polyols having the most excellent foam stability is 1% and which has the best strength is 1%.Keywords: moringa seed oil, epoxidation, polyol, saponification
Co-Authors Anton Gunawan Eka Putri Jayanthy Sihombing Ritson Purba Saibun Sitorus Soerja Koesnarpadi