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Alchemy Jurnal Penelitian Kimia
Published by Universitas Sebelas Maret
ISSN : -     EISSN : -     DOI : -
Core Subject : Science, Social, Engineering,
Chemical Engineering, Chemistry & Bioengineering Energy Environmental Science Materials Science & Nanotechnology
Arjuna Subject : -
Articles 3 Documents
 1 
Search results for , issue " Vol 8, No 2 (2012)" : 3 Documents clear
CATALYST TABLET OF Cu-TiO2/GRAPHITE FOR PHOTO-AND ELECTRO-ASSISTED DEGRADATION OF REMAZOL YELLOW FG Rahmawati, Fitria; Apriyani, Rochmi I.; Rahardjo, Sentot B.
Alchemy Jurnal Penelitian Kimia Vol 8, No 2 (2012)
Publisher : Alchemy Jurnal Penelitian Kimia

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Abstract

Titanium dioxide (TiO2) film was supported on graphite (G) by means of chemical bath deposition (CBD) from TiCl4 precursor. Meanwhile surfactant cetyl trimethyl ammonium bromide (CTAB) was added as linking and assembling agent between titanium network and graphite substrate. Cu was deposited electrochemically from 0.4 M of CuSO4 solution at 0.03 A of electric current. The tablets of TiO2/G and Cu-TiO2/G were used as catalyst for photocatalytic degradation (PC), electrocatalytic degradation (ED) and photoelectrocatalytic (PEC) degradation of Remazol Yellow FG. In degradation system which used TiO2/G tablet, the highest rate constant, k, was achieved by PEC method, k was 2.810-3 min-1, as well as in the system which used Cu-TiO2/G tablet. However, this research founded that direct oxidation by external electric field contribute more to degradation process than photocatalytic mechanism, proved by high rate constant of ED, k was 2.610-3 min-1. Meanwhile, rate constant of photocatalytic degradation was 510-4 min-1. This research also founded that TiO2 film highly contribute in degradation process due to the fact that rate constant of electrodegradation by using blank graphite is low, k was 510-4 min-1. Meanwhile, deposition of Cu onto TiO2 did not enhance degradation rate of remazol yellow by PEC method, however it enhanced the rate constant of ED to 2.710-3 min-1. The FTIR analysis to the completedly degraded remazol yellow FG solution shows disappearance of N=N stretching at 1559 cm-1and as CH2 at 2919 cm-1. This indicates that molecular structure of remazol yellow has been degraded succesfully then convert this dye solution into clear solution.Keywords : Cu-TiO2/graphite, electrocatalytic degradation, photoelectrocatalytic degradation, remazol yellow FG, TiO2/Graphite.
AMENTOFLAVON DARI DAUN NYAMPLUNG (Calophyllum inophyllum Linn.) Wartono, M. Widyo; Wulandari, Dian; Handayani, Nestri; Suryanti, Venty; Marliyana, Soerya D.
Alchemy Jurnal Penelitian Kimia Vol 8, No 2 (2012)
Publisher : Alchemy Jurnal Penelitian Kimia

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Abstract

Satu senyawa biflavonoid yaitu amentoflavon (1) berhasil diisolasi dari daun tumbuhan nyamplung (Calophyllum inophyllum Linn). Ekstraksi menggunakan metode maserasi dan pemurnian dengan kromatografi kolom dengan fasa diam Si-gel dan sephadex LH-20. Elusidasi struktur menggunakan metode spektroskopi UV, IR, 1H dan 13 C NMR beserta HMQC dan HMBC. Hasil yang diperoleh dianalisis dan dibandingkan dengan data referensi.Kata kunci: Amentoflavon, biflavonoid, Calophyllum inophyllum, Daun
UJI TOKSISITAS SECARA BRINE SHRIMP LETHALITY EKSTRAK BUAH MERAH (Pandanus Conoideus Lamk.) Marliyana, Soerya D.; Rakhman W, Fajar; Handayani, Nestri; Rakhmawati, Rita
Alchemy Jurnal Penelitian Kimia Vol 8, No 2 (2012)
Publisher : Alchemy Jurnal Penelitian Kimia

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Abstract

Telah dilakukan uji toksisitas secara Brine Shrimp Lethality Test (BSLT) ekstrak buah merah (Pandanus Conoideus Lamk.). Uji toksisitas dilakukan pada ekstrak etanol dan n-heksana. Hasil uji BSLT menunjukkan rata-rata prosentase kematian ekstrak n-heksan lebih tinggi dibandingkan dengan ekstrak etanol, sebesar 54 % diukur pada konsentrasi 400 (μg/mL). Ekstrak n-heksan selanjutnya dilakukan pemisahan secara kromatografi kolom dengan elusi secara gradien menggunakan pelarut campuran n-heksana-etil asetat untuk memperoleh fraksi aktif. Uji toksisitas secara BSLT menunjukkan fraksi aktif mempunyai nilai LC50 sebesar 138,05 μg/mL. Identifikasi fraksi aktif diperoleh 3 komponen senyawa asam lemak yaitu asam palmitat, asam oleat dan asam miristat.Kata Kunci : Buah merah (Pandanus conoideus Lamk.), identifikasi, toksisitas, Brine Shrimp LethalityABSTRACT

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