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All Journal Journal of Tropical Life Science : International Journal of Theoretical, Experimental, and Applied Life Sciences CAKRA KIMIA (Indonesian E-Journal of Applied Chemistry) Jurnal Ilmiah Teknik Sipil Jurnal Kimia (Journal of Chemistry) Buletin Udayana Mengabdi Jurnal Veteriner Bumi Lestari Ecotrophic, Journal of Environmental Science Kappa Journal International Journal of Engineering and Emerging Technology Jurnal Media Sains Jurnal Syntax Transformation

I Nengah Simpen

Program Studi Kimia FMIPA Universitas Udayana, Bukit Jimbaran, Bali

Author-ID : 2920838

Agriculture, Biological Sciences & Forestry Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Environmental Science Immunology & microbiology Law, Crime, Criminology & Criminal Justice Mechanical Engineering Medicine & Pharmacology Physics Social Sciences Veterinary Other

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KARAKTERISTIK FISIKO-KIMIA KATALIS HETEROGEN CaO-BASE DAN PEMANFAATANNYA UNTUK KONVERSI MINYAK GORENG BEKAS SECARA SINAMBUNG MENJADI BIODIESEL I N. Simpen; I M. S. Negara; O. Ratnayani
Jurnal Kimia (Journal of Chemistry) Vol. 15, No.2, Juli 2021
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JCHEM.2021.v15.i02.p09

Penelitian tentang katalis heterogen berbasis CaO dari cangkang kepiting sebagai support yang dimodifikasi dengan K2CO3 dan TiO2 serta pemanfaatnnya untuk konversi minyak goreng bekas secara sinambung menjadi biodiesel telah dilakukan. CaO hasil preparasi dicampurkan dengan K2CO3 dan TiO2 dengan variasi rasio secara reaksi fasa padat. Katalis heterogen yang diperoleh dikarakterisasi luas permukaan spesifik BET dan rerata ukuran partikelnya dengan N2 gas sorption analyzer, keasaman dan kebasaan permukaannya dengan metode titrasi asam basa, serta kristalinitasnya dengan XRD. Katalis dengan karakteristik terbaik diuji aktivitas katalitiknya terhadap yield biodiesel dalam mengonversi minyak goreng bekas dan kandungannya dianalisis menggunakan GC-MS. Hasil yang diperoleh menunjukkan bahwa karakteristik fisiko-kimia katalis optimum diperoleh pada CaO/K2O:TiO2 rasio massa 3:1. Uji aktivitas katalitik untuk konversi minyak goreng bekas menjadi biodiesel diperoleh yield 88,24%, lebih tinggi dari CaO/K2O (65,03%) dan CaO (64,09%). Analisis GC-MS menunjukkan bahwa komposisi biodiesel yang dominan adalah metil ester, yaitu metil laurat, metil meristat, metil palmitoleat, dan metil linoleat. Kata kunci: biodiesel, CaO/K2O:TiO2, katalis heterogen, karakteristik fisiko-kimia, minyak goreng bekas Research about heterogeneous catalyst prepared from CaO of crab shells as support modified with K2CO3 and TiO2 as well as its utilization for converting used cooking oil (UCO) into biodiesel simultaneously has been carried out. Prepared CaO was mixed with K2CO3 and TiO2 with various ratios by using solid state reaction. The BET spesific surface area and the mean particle size of the resulting heterogenous catalyst were characterized by N2 gas sorption analyzer, surface acidity and basicity by base-acid titration method, and crystallinity by XRD. The activity of the catalyst with the best characteristics for converting UCO into biodiesel yield was tested and the chemical contents were analyzed by GC-MS. The results showed that the optimum physico-chemical characteristics of the heterogeneous catalyst was CaO/K2O:TiO2 with mass ratio of 3:1. The catalytic activity of the CaO/K2O/TiO2 catalyst in converting UCO into biodiesel was 88.24%, higher than CaO/K2O catalyst (65.03%) and CaO (64.09%). The results of GC-MS analysis indicated that the chemical contents of biodiesel were dominantly methyl esters, such as methyl laurate, methyl meristate, methyl palmitoleate, methyl palmitate, and methyl linoleate. Keywords: biodiesel, CaO/K2O:TiO2, heterogeneous catalyst, physico-chemical characteristics, used cooking oil

SINTESIS KOMPOSIT SELULOSA-POLIPROPILENA DENGAN REAGEN FENTON SEBAGAI AGEN PENGKOPLING I Nengah Simpen; I Made Sutha Negara
Jurnal Kimia (Journal of Chemistry) Vol. 7, No. 1 Januari 2013
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

The research was conducted to observe of mixture ratio of cellulose from eceng gondok, concentrations of H2O2/Fe2+ (Fenton reagent), and concentrations of polypropylene from plastic garbage wich produced optimum condition to composite production with strong mechanics and biodegradable properties. This research was conducted by determination of optimum condition in composite forming of cellulose-PP. Steps performed within forming of cellulose-PP were (1) purification of plastic garbage to get polypropylene (PP); (2) cellulose extraction of from enceng gondok by alkaline extraction; continued with (3) composite forming of cellulose-PP through reaction of free radical with Fenton reagent as insiator. Determination of optimum conditions for the formation of cellulose-PP composite was conducted by varying some variables influencing the properties of mechanicals and biodegradability of cellulose-PP composite that is concentration ratio between cellulose and PP and concentration of H2O2. Composite of cellulosa-PP to be tested by mechanicals properties (elasticity modulus (MOE), breaking modulus (MOR), and density and also its ability of water absorption test and biodegradability test on dry land and wet land. The result gave optimum ratio of 1:3 and optimum concentration of H2O2 of 0.5%. Analysis of Laser Induced Breakdown Spectroscopy (LIBS) showed that the hardness of EG-PP was higner than with plastic PP and that insertion of cellulose molecule in composite was successful. Its optimum conditionthe EG-PP composite can adsorp 18.73% water and biodegradable properties.

KARAKTERISTIK SIFAT FISIKO KIMIA GELATIN HALAL YANG DIEKSTRAK DARI KULIT AYAM BROILER MELALUI VARIASI SUHU Ni Made Puspawati; I Nengah Simpen; Ni Luh Putu Suciptawati
Jurnal Kimia (Journal of Chemistry) Vol. 8, No. 1 Januari 2014
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

The aim of this study was to characterize physicochemical properties of gelatin extracted from skin of chicken at different temperatures (40oC, 45oC, 50oC) for 24 hours. Pre-treatment of dry defatted skin of chicken was done with a combination of alkaline-acid solution sodium hydroxide (NaOH, 0.15%w/v), sulfuric (0.15%v/v) and citric acid (0.7%w/v) and extraction was carried out in waterbath by adding water at pH 4-5. Physicochemical properties analyzed were yield, gel strength, proximate compositions, pH and characteristicfunctional groups. Statistical analysis showed that temperatures of extraction significantly (p<0.05) affected the physicochemical properties of gelatin produced. The yield and proximate compositions increased by increasing temperatures of extractions. The highest yield, water, protein, ash and fat content of gelatin (based on dry weight) were obtained at 50oC and the lowest at 40oC. Conversely, gel strength of gelatin decreased by increasing the temperature of extraction. Gelatin prepared at 40oC showed the highest gel strength (114.84g bloom) which was higher than gel strength of gelatin commercial (98.81 bloom) (p<0.05) while gelatin extracted at 45oC gave the lowest value (73.44g bloom). Gelatin extracted at different temperatures had significantly different pH (p<0,05). pH value of gelatin extracted at 40oC,45oC, dan 50oC was 3,29, 3,47, and 4,29 respectively. Fourier transform infrared (FTIR) spectra of all gelatin prepared in this experiment revealed the presence of band corresponding to –OH, C-O, N-H and C-N, C=O and NCO of secondary amidewhich characteristic for gelatin functional groups.

TRANSESTERIFIKASI MINYAK BIJI KARET (Hevea brasiliensis) MENGGUNAKAN KATALIS HETEROGEN CANGKANG KEPITING LIMBAH SEAFOOD TERMODIFIKASI K2O N. K. D. Astuti; I N. Simpen; I W. Suarsa
Jurnal Kimia (Journal of Chemistry) Vol.13 No.1 Januari 2019
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

The CaO heterogeneous catalysts can be prepared by CaCO3 calcination process, with one source of CaCO3 being a crab shell from seafood waste. The preparation of the heterogeneous catalyst was successfully carried out by modification with KOH using a wet impregnation method at 800oC for 5 hours. The purpose of this research is to determine the physical and chemical characteristics of heterogeneous catalyst of K2O-modified crab shell and to examine the heterogeneous catalyst of K2O-modified shells in converting rubber seed oil into biodiesel. The results showed that the lowest basic alkalinity possessed without modified catalyst (1.0428 mmol g-1) and the highest alkali possessed potassium-modified catalyst (1.8314 mmol g-1). Characterization of specific surface area of ??crab shells without and with modified K2O were relatively the same. The surface morphology of the catalyst without and K2O modified was uniform. The catalyst examination results for conversion of rubber seed oil (Hevea brasiliensis) to biodiesel, the optimum catalyst concentration of 3% and the molar ratio of oil:methanol of 1:9 capable converting to biodiesel with the yield of 91.05%. The content of biodiesel were stearic methyl ester, linoleic methyl ester, linolenic methyl ester, and palmitic methyl ester.

SINTESIS DAN KARAKTERISASI KOMPOSIT KAOLIN-Cr2O3 SERTA PEMANFAATANNYA SEBAGAI FOTOKATALIS DALAM MENDEGRADASI ZAT WARNA REMAZOL BRILLIANT ORANGE Ni Luh Eka Anggarayanti; I Nengah Simpen; Ni Gusti Ayu Made Dwi Adhi Suastuti
Jurnal Kimia (Journal of Chemistry) Vol. 11. No. 1 Januari 2017
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

Komposit kaolin-Cr2O3 telah disintesis dan dikarakterisasi luas permukaan spesifik secara metode adsorpsi biru metilen, kristalinitas dan ukuran kristal secara X-RD dan gugus fungsi menggunakan FT-IR. Luas permukaan spesifik kaolin-Cr2O3 mengalami peningkatan sebesar 1,9822 m2/g dibandingkan dengan kaolin. Hasil X-RD diperoleh 2? spesifik dari Cr2O3 pada kaolin-Cr2O3 dengan pergeseran puncak 2? = 35,960 dan 41,900. Ukuran kristal kaolin dan kaolin-Cr2O3 dihitung menggunakan persamaan Scherrer dan dihasilkan ukuran kristal berturut-turut 32,63 nm dan 29,33 nm. Spektra inframerah menunjukkan adanya gugus spesifik dari Cr2O3 pada bilangan gelombang 653,87 cm-1 dan 613,36 cm-1. Kondisi optimum fotodegradasi zat warna remazol brilliant orange oleh 0,5 gram komposit kaolin-Cr2O3 terjadi pada menit ke-50 dengan konsentrasi zat warna 50 ppm dan persentase degradasi zat warna remazol brilliant orange 81,49 ± 0,57% lebih besar dibandingkan degradasi oleh Cr2O3 (11,97 ± 2,58%).

SINTESIS DAN KARAKTERISASI ABU SEKAM PADI-LITIUM OKSIDA SERTA UJI AKTIVITAS KATALITIKNYA DALAM PEMBUATAN BIODIESEL DARI MINYAK BIJI MALAPARI I N. Simpen; N. L. Arpiwi; M. Indra Dwitama
Jurnal Kimia (Journal of Chemistry) Vol.12 No.2 Juli 2018
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

Penelitian ini dilakukan untuk menentukan sifat kimia fisik dari katalis abu sekam padi (ASP) termodifikasi litium oksida, optimasi suhu kalsinasi dalam sintesis katalis, serta menguji aktivitas katalitiknya dalam pembuatan biodiesel dari minyak biji malapari (Pongamia pinnata L.). Pembuatan katalis heterogen telah berhasil dilakukan melalui modifikasi ASP dengan litium karbonat. Modifikasi ASP dilakukan secara metode keramik melalui variasi suhu kalsinasi 700oC (Li-ASP700), 800oC (Li-ASP800), dan 900oC (Li-ASP900). Katalis heterogen yang diperoleh, dikarakterisasi, dan diuji aktivitasnya untuk pembuatan biodiesel dari minyak biji malapari. Karakterisasi katalis heterogen meliputi keasaman dan kebasaan permukaan, Brunauer, Emmett dan Teller (BET) surface area, gugus fungsional, dan rasio Li/Si. Hasil penelitian menunjukkan bahwa keasaman permukaan katalis Li-ASP700, Li-ASP800, dan Li-ASP900 semuanya adalah 0 mmol/g. Sementara, kebasaan permukaan tertinggi, surface area tertinggi, dan rasio Li/Si tertinggi diperoleh pada katalis Li-ASP700 berturut-turut yaitu 22,4883 mmol/g, 1,251 m2/g, dan 19,24. Oleh karena itu, suhu kalsinasi optimum dalam pembuatan katalis tersebut adalah 700oC. Katalis heterogen Li-ASP700 mampu mengkonversi minyak biji malapari menjadi biodiesel optimum pada persentase katalis 3% (b/b) dengan yield 87,29%. Kata kunci: abu sekam padi termodifikasi litium oksida, katalis heterogen, minyak biji malapari, biodiesel

KARAKTERISASI BATU KAPUR ALAM BUKIT JIMBARAN BALI Y. Ulfa; A.A. B. Putra; I N. Simpen
Jurnal Kimia (Journal of Chemistry) Vol.13 No.1 Januari 2019
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

This research is about the characterization of naturar limestone in the Bukit Jimbaran area of Bali. The aim of this research was to learn chemical composition and micromorphology of Bukit Jimbaran limestone. The research was conducted in sequential steps as described below i.e. the limestone was grinded and sieved in size of 0.25-0.50 mm. Fine limestone, then was heated by using oven at 1000 C for 24 hours and analyzed by FTIR, XRD and SEM. The Spectra of FTIR showed that O-H, C-H, and C-O were dominantly functional groups, which composed CaCO3 and CaO. The results of CaO crystal measurements using Scherrer equation is 51,39 nm. Micromorphology observation by using SEM showed size shaped (vaterite) of Bukit Jimbaran limestone

EFEKTIVITAS PENURUNAN KADAR SURFAKTAN LINIER ALKIL SULFONAT (LAS) DAN COD DARI LIMBAH CAIR DOMESTIK DENGAN METODE LUMPUR AKTIF Ni G. A. M Dwi Adhi Suastuti; I Nengah Simpen; Nanik Ayumi
Jurnal Kimia (Journal of Chemistry) Vol. 9, no. 1 Januari 2015
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

This study aimed to determine the ability of the activated sludge in decreasing the concentration of surfactant Linear Alkyl Sulfonate (LAS) and COD in domestic wastewater. The study was begun with the preparation of liquid medium, then mixed with sediment samples to produce the activated sludge. The treatment was carried out by adding the activated sludge to 1250 mL of domestic sewage in the aeration system running for 168 hours. Observations of the LAS and COD values were performed in a period of 6, 24, 72, 120, and 168 hours. The results showed that 5 g activated sludge were able to reduce the values of LAS and COD of 99.70 and 91.08% respectively in 168 hours. The most significant declining values of LAS and COD took place at 6 hours treatment. The rate of declining values of LAS and COD were 82.78 and 55%

KARAKTERISTIK MUTU GELATIN DARI KULIT AYAM BROILER MELALUI PROSES PERENDAMAN KOMBINASI ASAM-BASA I Nengah Simpen; Ni Made Puspawati; A A I Rahma Prabawanti
Jurnal Kimia (Journal of Chemistry) Vol. 10, No. 2 Juli 2016
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

Kandungan kolagen yang cukup tinggi pada kulit ayam berpotensi untuk dikembangkan sebagai bahan baku alternatif gelatin halal. Penelitian ini bertujuan untuk mempelajari pengaruh variasi pelarut asam, yaitu asam asetat, asam laktat dan asam sitrat dengan konsentrasi masing-masing 1% setelah perendaman basa NaOH 0,15% terhadap rendemen, pH, viskositas, dan kekuatan gel produk gelatin yang diekstrak dari kulit ayam broiler. Proses perendaman yang menghasilkan gelatin terbaik dipilih berdasarkan acuan standar mutu, kemudian gelatin tersebut dikarakterisasi sifat fisikokimianya dan dibandingkan dengan gelatin komersial. Penelitian ini disusun menggunakan rancangan acak lengkap (RAL) enam perlakuan dengan tiga kali ulangan dan dianalisis dengan metode one-way ANOVA. Hasil penelitian menunjukkan perbedaan perlakuan pada proses perendaman tidak berpengaruh nyata (P>0,05) terhadap hasil rendemen, sedangkan terhadap pH, viskositas, dan kekuatan gel berpengaruh nyata (P<0,05). Gelatin terbaik dihasilkan dari proses perendaman dengan NaOH 0,15% dilanjutkan dengan asam asetat 1%. Analisis sifat fisikokimia gelatin terpilih menunjukkan hasil yang tidak berbeda dengan gelatin komersial, serta memenuhi standar mutu SNI dan British Standard dengan karakteristik pH 5,20; viskositas 4,20 cP; kekuatan gel 239,92 g bloom; kadar air 11%; kadar abu 1,08%; kadar protein 91,82%; dan kadar lemak 0,99%. Hasil analisis spektra FTIR menunjukkan gugus fungsi khas gelatin pada sampel, yaitu gugus O-H, N-H, C-O, C=O, C-N dan NCO.

OPTIMASI DEASETILASI KHITIN DARI KULIT UDANG DAN CANGKANG KEPITING LIMBAH RESTORAN SEAFOOD MENJADI KHITOSAN MELALUI VARIASI KONSENTRASI NaOH N. M. Puspawati; I N. Simpen
Jurnal Kimia (Journal of Chemistry) Vol. 4, No. 1 Januari 2010
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (120.363 KB)

Chitin resulted from treatment of shrimp and crab shells wasted of seafood restaurant, can be transformedinto chitosan through deacetylation process using concentrated NaOH. This research aims to investigate the optimumcondition of the deacetylation process to achieve a high yield and deacetylation degree of chitosan by varying theconcentration of NaOH while temperature and length of reaction are made constant at 120oC for 4 hours. Theconcentration of NaOH used in this research was 50; 55; and 60%, respectively. All chitosan obtained were purifiedand characterized by FTIR. The deacetylation degree of chitosan was calculated based on FTIR spectra data.The result found, the optimum condition for deacetylation of chitin from shrimp shells at 120oC for 4hours, was achieved using NaOH 60%, giving a high yield of 54.90% and deacetylation degree of 88.04%.. Usingthe same condition as for deacetylation chitin from shrimp, chitosan obtained from crab shells gave a better yieldwhich was 62.76 %, and the deacetylation degree of 88.53%. Both chitosans obtained from shrimp and crab shellssolubled in a 2% acetic acid solution.

Co-Authors A A I Rahma Prabawanti A.A. B. Putra Anak Agung Gde Raka Dalem Anastasia Victor, Agnes Maria Salvi Arsa Arsa D. A. D. N. Dewi D.M Priyantha Wedagama Dewik Setiyawati Dwi Adhi S, Ni Gusti Ayu Made Dwi Anggraeni Putri Suandi Ewa Satriawijaya Febby Hartesa W G M Arya Sasmita G.M.A. Sasmita Gunawan, A. A. Ngurah Gusti Ngurah Sutapa Hudi Nurwendi I Gde Antha Kasmawan I Gede Andy Andika Parahita I M. S. Negara I M. S. Negara I M. S. Negara I M. Trimastiya I Made Dupi Andika I Made Sutha Negara I Made Sutha Negara I Made Wisnu Adhi Putra I Nengah Artawan I Nengah Sandi I Nyoman Aribudiman I Nyoman Sumerta Miwada I Nyoman Suprapta Winaya I NYOMAN SUTARPA SUTAMA I Nyoman Widana I W BUDIARSA SUYASA I Wayan Redana I Wayan Suarsa I Wayan Sudiarta I Wayan Suditayasa I. M. S. Negara I.A.G. Widihati I.A.G. Widihati I.M.S. Negara Ida Ayu Agung Pradnyani Ida Bagus Made Suryatika Ika Umratul IM.S. Negara Ketut Gede Dharma Putra Komang Yogi Purnamawati M. Arsa M. Indra Dwitama M. W. Prayani Made Indra Dwitama Made Suryatika, Ida Bagus Muhammad Nasib N. K. A. Oktapiani N. K. D. Astuti N.M. Puspa wati Nanik Ayumi Ni G. A. M. Dwi Adhi Suastuti Ni Ketut Suminten Ni Komang Tria Paramita Septiari Ni LUH ARPIWI Ni Luh Eka Anggarayanti Ni Luh Nyoman Kebayantini Ni Luh Putu Suciptawati Ni Made Puspawati Ni Made Widya Pratiwi Ni Nyoman Pujianiki Ni Nyoman Rupiasih Ni Putu Diantariani Ni Putu Gita Bonita Dewi Ni Putu Widya Tironika Dewi Ni Wayan Trisnadewi, Ni Wayan O. Ratnayani O. Ratnayani O. Ratnayani Oka Ratnayani Olivia Carolyn Sitepu Prawistya Putra, I Made Gede Mas Putra Adnyana, I Gusti Agung Putra, Anak Agung Bawa Putu Suarya R. Dalem S. R. Mustikawati Sihotang, Erikson Sihotang, I Nyoman Sitanggang, Katrin Walensky Siti Helmyati Siti Zulaikah Sri Rahayu Santi Tri Lestari, Komang Ayu W. A. Fauzi Y. N. Handayani Y. Ulfa

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