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Published by Institut Teknologi Sepuluh Nopember Surabaya

ISSN : 18584586 EISSN : 25493736 DOI : -

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Chemistry

Akta Kimia Indoneisa publishes peer-reviewed open access articles in all areas of chemistry, including: Analytical Chemistry Physical Chemistry Organic Chemistry Inorganic Chemistry Biological Chemistry To submit an article, you need to register first. Please click register in the menus above.

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Articles 6 Documents

Search results for , issue "Vol 4, No 1 (2019)" : 6 Documents clear

Pengaruh Konsentrasi Aktivator Kalium Hidroksida (KOH) pada Karbon Aktif dan Waktu Kontak Terhadap Daya Adsorpsi Logam Pb dalam Sampel Air Kawasan Mangrove Wonorejo, Surabaya Nia Nurfitria; Kuntum Febriyantiningrum; Wahyu Prasetyo Utomo; Zjahra Vianita Nugraheni; Devita Dwining Pangastuti; Hanifatul Maulida; Fitri Nur Ariyanti
Akta Kimia Indonesia Vol 4, No 1 (2019)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember

Penelitian ini bertujuan untuk mengetahui pengaruh aktivator KOH dan waktu kontak karbon aktif dari tempurung kelapa terhadap adsorpsi logam Pb di sampel air kawasan mangrove Wonorejo Surabaya. Kandungan awal ion logam Pb2+ pada sampel air berjumlah 1,1890 ppm. Karbon aktif dibuat dari tempurung kelapa. Aktivasi dilakukan menggunakan KOH dengan variasi konsentrasi 1 M, 3M, dan 5 M. Waktu kontak adsorpsi ion logam Pb2+ pada sampel air menggunakan karbon aktif divariasikan selama 1 jam, 1,5 jam, 2 jam dan 2,5 jam untuk setiap variasi konsentrasi aktivator KOH. Hasil adsorpsi terbanyak didapatkan dari karbon aktif yang diaktivasi KOH 1M dengan waktu kontak selama 1,5 jam. Jumlah ion logam Pb2+ yang teradsorp yaitu sebesar 1,5645 mg/L atau 86% dari konsentrasi awal.

Pengaruh Jumlah Serat Gelas Sebagai Material Pendukung dalam Sintesis Zeolit-A Nurul Widiastuti; Patrick Rella Shara
Akta Kimia Indonesia Vol 4, No 1 (2019)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember

Pengaruh jumlah serat gelas sebagai material pedukung dalam sintesis Zeolite-A telah diamati pada penelitian ini. Sintesis dilakukan dengan teknik hidrotermal pada suhu 100oC. Variasi yang dilakukan pada penelitian ini adalah penambahan serat gelas sebanyak 0,01; 0,024; 0,1 dan 1 gram dalam tiap 100 gram komposit. Jumlah serat gelas sebanyak 0,024 gram menunjukkan hasil terbaik untuk sintesis zeolite-A bermaterial pendukung serat gelas. Sebagai data pendukung dilakukan karakterisasi menggunakan instrumen FT-IR (Fourier Transform), XRD (X-Ray Diffraction) dan SEM (Scanning Electron Microscopy).

Sintesis Zeolit ZSM-5 dari Metakaolin Terdealuminasi Tanpa Cetakan Organik dengan Metode Desilikasi Hartati Hartati
Akta Kimia Indonesia Vol 4, No 1 (2019)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember

Zeolit ZSM-5 mesopori telah berhasil disintesis dari bahan dasar metakaolin terdealuminasi tanpa cetakan organik. Kalsinasi kaolin Bangka-Belitung dilakukan pada suhu 650°C selama 8 jam untuk mendapatkan metakaolin. Dealuminasi metakaolin dilakukan dengan larutan HCl. Proses hidrotermal dilakukan pada suhu 170°C selama 48 jam menghasilkan zeolit ZSM-5 mikropori yang dikonfirmasi dari hasil analisis produk menggunakan XRD dan FTIR. ZSM-5 mesopori diperoleh dengan cara desilikasi ZSM-5 mikropori menggunakan larutan NaOH. Hasil analisis fisisorpsi N2 menunjukkan terbentuknya ZSM-5 mesopori. Metode desilikasi terbukti efektif meningkatkan luas permukaan mesopori, volume pori dan menurunkan luas permukaan mikropori. Kata kunci : Zeolit ZSM-5 mesopori, tanpa cetakan organik, metakaolin, dealuminasi, desilikasi

UPAYA re-PRODUKSI SUMUR TUA CEKUNGAN WONOCOLO MELALUI KARAKTERISASI GEOKIMIA ORGANIK R. Y Perry Burhan; Yulfi Zetra; Pusparatu Pusparatu; Zjahra Vianita Nugraheni
Akta Kimia Indonesia Vol 4, No 1 (2019)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember

Penelitian yang dilakukan terhadap biomarka fraksi hidrokarbon alifatik menunjukkan adanya senyawa n-alkana (n-C13 - n-C27); isoprenoid pristana (Pr) dan fitana (Ph); 4,4,8,9,9-pentametildekalina; 4-b-(H)-eudesmana; 8-b-(H)-drimana; 2,3,6,9,9-pentametildekalina dan 8-b-(H)-homodrimana. Pola distribusi kelompok biomarka n-alkana ditunjukkan oleh persebaran unimodal n-C13 - n-C27, yang menunjukkan asal usul senyawa organik sedimen terdistribusi merata berasal dari fitoplankton dan zooplankton, bakteri dan tumbuhan tingkat tinggi. Rasio Pr > Ph merupakan indikator lingkungan pengendapan oksik dengan kadar garam yang rendah. Adanya senyawa 4-b-(H)-eudesmana mengindikasikan senyawa organik berasal dari tumbuhan darat tingkat tinggi konifer yang tumbuh pada zaman Devonian Akhir. Keberadaan senyawa 8-b-(H)-drimana mengindikasikan adanya masukan alga hijau, plankton dan bakteri Botryococcus braunii. Namun tingginya kelimpahan senyawa 8-b-(H)-homodrimana dibandingkan kelompok senyawa sesquiterpena lainnya merupakan indikator senyawa organik yang berasal dari tumbuhan darat tingkat tinggi. Kontribusi biomarka yang berhasil diungkapkan pada penelitian ini menunjukkan bahwa sedimen sumur tua Wonocolo ini adalah unik dan menarik untuk dipelajari lebih lanjut karena senyawa organiknya variatif, berasal dari bakteri, plankton dan tumbuhan darat tingkat tinggi.

The Effect of Nitrogen Stress And Photoperiode on Growth and Fatty Acid Content of Nannochloropsis sp. Dini Ermavitalini; Sumarni Dwirejeki; Sri Nurhatika; Triono Bagus Saputro
Akta Kimia Indonesia Vol 4, No 1 (2019)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember

Energy consumption increases from year to year and 95% is fulfilled by fossil materials which are limited, so that a replacement energy source is needed. Biodiesel is a fuel from renewable sources such as plants or animals. Biodiesel from Jatropha curcas and palm oil has been produced but oxidation is low in cold temperatures and long time to production. On the other hand, Nannochloropsis sp., as marine microalgae can produce lipids as biodiesel material reaches 90% of the biomass dry weight in stress condition, It’s higher than lipid that produced by Jatropha curcas (35% DW) and palm (75,6% DW). Nannochloropsis sp. also short growth, easily propagated. Production of lipids and TAGs of Nannochloropsis sp. can be engineered based on nutrient, temperature, aeration, salinity, photoperiod. This study aims to examine the effect of nitrogen stress and photoperiode on biomass, chlorophyll content, fatty acid profile, content of TAG. Nannochloropsis sp. cultured from the starter then cultured in variation of nitrogen stress and phoroperiode. In the last exponential, culture analized in quantitative to get the biomass and chlorophyll content. Fatty acid and TAG analized by qualitative. The interaction between nitrogen and photoperiode did not affect the biomass of Nannochloropsis sp. but it affects the chlorophyll content where the chlorophyll content of P14 (N100, 16: 8) is 7.367 mg/L. It is not significantly different from the treatment P6 (N25, 24: 0) of 3.339 mg/L and treatment P15 (N100, 24: 0) 5.665 mg/L. All cultures with a treatment combination showed triacylglycerol content. The results of the treatment of fatty acid profiles P14 (N100, 16: 8) contain more varied fatty acids compared to P1 (N0, 12:12), P2 (N0, 16: 8), P8 (N50, 62: 8), P10 (N75 , 12:12) which consists of lauric acid, hexagonal acidrionate, palmitic acid, linoleic acid, oleic acid, stearate acid, eicosanoic acid.The result showed that the treatment of nitrogen stress and photoperiode affecting the growth and fatty acid content of Nannochloropsis sp.

Extracellular Alkaline Phosphatase from Mangrove Soil Yeast Nur Hidayatul Alami; Windasari Putri Septarina; Tania Pratiwi; N. D Kuswytasari; Enny Zulaika; Maya Shovitri
Akta Kimia Indonesia Vol 4, No 1 (2019)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember

Alkaline phosphatase is a widely used enzyme in research and industry. Yeast is one of a microbial group that has the potency to produce alkaline phosphatase. This study aims to screen yeast from mangrove in Surabaya’s East Coast with the potential of alkaline phosphatase and to optimize the production of these enzymes. Screening test includes the measurement of phosphate solubilization index and concentration of soluble phosphate. Yeast with potential of phosphate solubilization will be used to measured the enzyme activity and also further optimized for extracellular alkaline phosphatase production. Optimization was done by determining the incubation time and a variety of combinations of phosphate source and temperature. The incubation time was adjusted to 7 days. Ca3(PO4)2 and KH2PO4 as the phosphate source and incubation temperature were adjusted to 29° C, 45° C, and 55° C. The results showed that isolates with the highest phosphate solubilization index were W1.1 and G3.2 (1.18 for W1.1 and 1.15 for G3.2). Yeast with the ability to solubilize phosphate was assumed to be Candida genus. W1.1 and G3.2 produced soluble phosphate in a concentration of 0.50 ppm and 0.77 ppm at the 7th day respectively. Candida G3.2 has higher enzyme activity than Candida W1.1. Candida G3.2 has optimal production for 3 days incubation time with a combination of temperature 29 °C and Ca3(PO4)2as the phosphate source which caused 97.8 U/mL enzyme activity.

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