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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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HIDROKSIAPATIT TERMODIFIKASI Fe DAN APLIKASINYA UNTUK ADSORPSI ZAT WARNA CONGO RED Ni Komang Tria Paramita Septiari; I Nengah Simpen; Ni G. A. M. Dwi Adhi Suastuti
Jurnal Kimia (Journal of Chemistry) Vol. 11. No.2 Juli 2017
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

Penelitian ini tentang adsorpsi zat warna congo red oleh hidroksiapatit hasil dekomposisi termal 400oC (TA1) dan hidroksiapatit hasil dekomposisi termal 400oC termodifikasi Fe (TA2). Penelitian ini meliputi ekstraksi hidroksiapatit dari tulang secara dekomposisi termal, penentuan jumlah situs aktif hidroksiapatit secara titrasi asam basa, luas permukaan secara metode sorpsi biru metilen, perbandingan unsur Ca/P dianalisis menggunakan laser induced breakdown spectroscopy(LIBS), kristalinitas secara difraksi sinar-X (XRD), penentuan waktu setimbang adsorpsi congo red, isoterm adsorpsi dan kapasitas adsorpsi congo red tanpa dan dengan penambahan H2O2 menggunakan spektrofotometer UV-Vis. Hasil penelitian menunjukkan bahwa jumlah situs aktif hidroksiapatit tertinggi ditunjukkan oleh TA1 yaitu 19,3493x1023 situs/gram dan luas permukaan tertinggi ditunjukkan oleh TA1 yaitu 26,5375 m2/g. Perbandingan unsur Ca/P yang dihasilkan oleh TA1 yaitu 1,6425 sesuai literatur (1,67). TA2 menghasilkan puncak XRD yang lebih mendekati puncak hidroksiapatit murni dengan intensitas 100 yang memiliki sudut 2 31,99o. Secara umum adsorpsi congo red tanpa dan dengan penambahan H2O2 terjadi peningkatan kapasitas teradsorpsi seiring dengan bertambahnya konsentrasi congo red dan lebih tinggi dibandingkan serbuk tulang kontrol (T0).

ADSORPSI ION LOGAM Cr(III) PADA SILIKA GEL DARI ABU SEKAM PADI TERMODIFIKASI LIGAN DIFENILKARBAZON (Si-DPZon) Ni Ketut Suminten; I Wayan Sudiarta; I Nengah Simpen
Jurnal Kimia (Journal of Chemistry) Vol. 8, No. 2 Juli 2014
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

The adsorption of Cr (III) using silica gel from rice husk ash modified with diphenilcharbazon ligand (Si-DPZon) was investigated.The aim of this study was to determine the optimum pH and contact time, the pattern of adsorption isotherm as well as the type of interaction between metal ion and the silica gel through sequential desorption. The result showed that the silica gel resulted has a surface acidity (Kal) of 0.1046 mmol/g and number of active sites of 17,9672 x 1020 atoms/gram. The adsorption optimum pH is 3.0 with the optimum contact time of 30 minutes where the Cr(III) adsorbed is 24,5047 mg/g. The adsorption follows the Freundlich isotherm. Interaction that occurs between the Cr (III) and the Si-DPZon adsorbent is dominated by physical interaction.

FOTODEGRADASI RHODAMIN B OLEH KATALIS ZEOLIT ALAM-TiO2/ZnO dan IRRADIASI SINAR TAMPAK N. K. A. Oktapiani; I N. Simpen; I M. S. Negara
Jurnal Kimia (Journal of Chemistry) Vol. 15, No.1, Januari 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.i01.p13

Penelitian tentang pembuatan komposit zeolit alam-TiO2/ZnO yang digunakan dalam proses fotodegradasi zat warna rhodamin B dan irradiasi sinar tampak telah dilakukan. Komposit yang terbentuk dikarakterisasi menggunakan metode BET (Bruneau, Emmet, dan Teller) untuk mengamati luas permukaan spesifik komposit, Fourier Tranform Infrared (FTIR) untuk menentukan gugus fungsi yang terkandung, dan metode titrasi asam-basa untuk mengetahui sifat asam-basa permukaan dan jumlah situs aktifnya. Karakteristik optimum diperoleh pada luas permukaan spesifik zeolit alam-TiO2/ZnO (3:1) sebesar 49.349 m2/g, dengan keasaman permukaan zeolit alam-TiO2/ZnO (3:1) adalah 2,9561±0,0586 mmol/g dengan jumlah situs aktif 1,7796 x 1021 atom/g. Uji fotodegradasi dari komposit zeolit alam-TiO2/ZnO (3:1) terhadap rhodamin B dengan irradiasi sinar tampak, optimum diperoleh pada konsentrasi awal 400 mg/L, waktu irradiasi 10 menit dan pH larutan 1, dengan persentase degradasi sebesar 99,30%. Kata kunci: fotodegradasi, irradiasi sinar tampak, rhodamin B, zeolit alam-TiO2/ZnO ABSTRACT The synthesis of natural zeolite-TiO2/ZnO composite which is used in the photodegradation process of rhodamine B dyes and visible light irradiation has been conducted. The composite was characterized using BET (Bruneau, Emmet, and Teller) method to observe its specific surface area, Fourier Tranform Infrared (FTIR) to determine the functional groups, and acid-base titration methods to determine the acid-base properties of composite surfaces. The optimum characteritics were obtained that the specific surface area of natural zeolite-TiO2/ZnO (3:1) was 49.349 m2/g, surface acidity of natural zeolite-TiO2/ZnO (3:1) of 2,9561±0,0586 mmoles/g with the amount of surface active sites was 1.7796 x 1021 atoms/g. The photodegradation testing of natural zeolite-TiO2/ZnO (3:1) composite with visible light irradiation showed that the optimum conditions obtained at initial concentration of rhodamine B dyes was 400 mg/L, at 10 minutes irradiation time and pH of 1, with the percentage of degradation was 99.30%. Keywords: photodegradation, visible light irradiation, rhodamine B, natural zeolite-TiO2/ZnO

SYNTHESIS AND CHARACTERIZATION OF PHOTOCATALYS Fe2O3 PILLARED MONTMORILLONITE DOPED TiO2 AND ITS APPLICATION FOR RHODAMINE B PHODODEGRADATION USING VISIBLE LIGHT IRRADIATION D. A. D. N. Dewi; I N. Simpen; I W. Suarsa
Jurnal Kimia (Journal of Chemistry) Vol.14 No.1 Januari 2020
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

A montmorillonite clay modified with semiconductor metal can act as a photocatalyst material. Montmorillonite clays were chosen because of their natural characteristics which are easily to be modified and have high specific surface area. This research aims to modify montmorillonite clay into photocatalyst material. The montmorillonite clay was intercalated using Fe2O3 to produce Fe2O3-pillared montmorillonite clay, then doped with TiO2 to form a photocatalyst material Fe2O3-PILC / TiO2. Modifications were intended to increase the specific surface area and number of active photocatalyst sites and thus increase the ability of photodegradation. The characterization carried out included characterizing the pillar formation using X-ray Diffraction (XRD), specific surface area by the BET method (Bruneau, Emmet, and Teller), a the number of surface acid-base sites by the titration method. Photocatalyst with the best character was Fe2O3-PILC / TiO2 1: 3 with specific surface area, number of acid and base sites respectively 45,947 m2/g, 20,1736 x 1023 sites/gram and 19,0044 x 1023 sites/gram. The result of photodegradation at optimum condition with visible light at pH 3 using 400 mg photocatalyst was 99.84%. Keywords: photocatalyst, Fe2O3, montmorillonite clay, TiO2, rhodamine B

KOMPOSIT DEGRADABEL POLIETILENA TEREFTALAT DENGAN SELULOSA MENGGUNAKAN REAGEN FENTON (H2O2/Fe2+) I M. Trimastiya; I M. S. Negara; O. Ratnayani; I N. Simpen
Jurnal Kimia (Journal of Chemistry) Vol.13 No.2 Juli 2019
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

PET is a non-degradable type of plastic that can cause environmental problems. This study aimed to form composites by cross-linking PET with cellulose using Fenton reagent initiator, finding out the effect of the addition of H2O2 on the fenton reagent used as an initiator in the mixture of PET-cellulose composites to water absorption and the rate of degradation in wet and dry soil media. The steps carried out in making PET-cellulose composites was refining PET using swelling techniques, followed by the formation of PET-cellulose composites by cross-linking through free radical reaction using fenton (H2O2/Fe2+) as the initiator with the variation of H2O2 amount (30 grams, 60 grams, 90 grams). The resulting composites were tested for water absorption and degradation properties in wet soil media and dry soil with untreated PET control. Characterization was carried out by functional group analysis using FTIR and its morphology with SEM. The results of the study showed that the composite making using the technique of cross-linking between polyethylene terephthalate and cellulose using fenton reagents was successfully carried out where the degradation rate of PET-cellulose composites slowed as the amount of hydrogen peroxide was used. In PET-cellulose composites, the more amount of H2O2 used, the weaker the absorption of the composite to water was. Keywords: degradable, fenton (H2O2/Fe2+), PET (Polyethylene Tephthalate), cellulose, composite.

SINTESIS DAN KARAKTERISASI ZEOLIT-TiO2 SERTA PEMANFAATANNYA SEBAGAI FOTOKATALIS UNTUK DEGRADASI RHODAMIN B W. A. Fauzi; I N. Simpen; I W. Sudiarta
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 synthesis of zeolite-TiO2 composite has been successfully performed by mixing the H2SO4-enriched natural zeolite to TiO2. The composites are formed then characterized functional groups using Fourier Transform Infrared (FTIR) and surface area with BET (Breunaur, Emmet and Teller) method. The characterization results showed that the synthesis of zeolite-TiO2 composites is relatively successful. Those can be seen from BET characterization higher to the composite surface area from 63.031 m2/g to 73.913 m2/g, then reinforced by the appearance of the functional groups of TiO2 in zeolite at wavelength 2345.44 cm-1, 792.74 cm-1 and 424.34 cm-1. Furthermore, the composite is used for the photodegradation of rhodamin B dyes with the highest degradation percentage was 97.39% in optimal irradiation contact time was reached at 10 minutes and the effective pH of 4

ELEKTROLISIS LOGAM PERAK DARI LIMBAH PENCUCIAN FILM FOTOGRAFI I Made Sutha Negara; I Nengah Simpen; Ida Bagus Made Suryatika
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

Penelitian ini bertujuan untuk menentukan kondisi optimum pemisahan logam perak dari limbah film fotografi secara elektrolisis. Elektrolisis limbah film fotografi dilakukan dengan perlakuan 4 variasi bentuk (geometri) katoda pada luasan yang sama dan 5 variasi jarak elektroda pada tegangan dan arus konstan. Pada awal dan akhir setiap elektrolisis, parameter yang diukur adalah massa katoda secara gravimetri dan kandungan perak dalam limbah diukur dengan spektrofotometer serapan atom. Hasil penelitian diperoleh bahwa pada optimasi bentuk elektroda, bentuk lempeng/plat memberikan penurunan konsentrasi yang paling tinggi (79,56% atau 0,3324 g) dibandingkan dengan katoda berbentuk silinder, balok dan prisma segi enam. Bentuk lempeng/plat dipilih sebagai elektroda dalam penentuan pengaruh variasi jarak terhadap persentase penurunan konsentrasi perak, massa perak yang menempel di katoda dan massa endapannya. Hasil variasi jarak elektroda pada katoda lempeng/plat, terbaik menunjukkan pada jarak 2 cm dengan pemisahan paling tinggi yaitu 79,99%. Perak yang dapat dipisahkan tidak seluruhnya menempel pada katoda setelah elektrolisis, melainkan perak dominan mengendap

PEMANFAATAN BATU PASIR LAUT WARNA HITAM TERAKTIVASI NaOH 4 N DAN TERSALUT Fe2O3 SEBAGAI ADSORBEN ION NITRAT I Nengah Simpen; Putu Suarya; Komang Yogi Purnamawati
Jurnal Kimia (Journal of Chemistry) Vol. 6, No. 2 Juli 2012
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 (190.885 KB)

The research about adsorption of nitrate ion was carried out by black sandstone that was activated by 4 N NaOH and coated by Fe2O3, and washed by aquades with coating pH variation of 5, 7 and 11. The aim of this research is to find the ability of modified sandstone adsorbent in decreasing nitrate ion concentration. This research included the determination of surface acidity by acid-base titration method, determination of the specific surface area by blue methylene method, determination of equilibrium time of adsorption, adsorption isotherms and adsorption capacity of sandstone on nitrate ions by UV-vis spectrophotometer. The results showed that the highest surface acidity came from the sandstone activated with 4 N NaOH and Fe2O3-coated (A1) which was 0.4423 mmol/g, where as the highest specific surface area was owned by sandstone activated with 4 N NaOH and with Fe2O3-coated pH 7 (A3), which was 21.2899 m2/gram. Isotherm patterns were classified in the Langmuir adsorption isotherm with r value 0.9895. The highest nitrate ion adsorption capacity of the adsorbent at pH 4.19 was 2.8333 mg/g in equilibrium time of 90 minutes. In this study, sandstone activated with 4 N and coated with Fe2O3 was able to provide higher capacity than the sandstone control.

ADSORPSI ZAT WARNA TEKSTIL REMAZOL BRILLIANT BLUE OLEH LIMBAH CANANG DAUN KELAPA S. R. Mustikawati; I N. Simpen; O. Ratnayani
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

Telah dilakukan penelitian adsorpsi zat warna tekstil Remazol Brilliant Blue dengan 2 macam adsorben yaitu adsorben daun kelapa dan adsorben daun kelapa terdelignifikasi (selulosa) yang berasal dari limbah canang daun kelapa. Dalam penelitian ini dilakukan tiga tahap, yaitu preparasi, optimasi, dan karakterisasi. Preparasi untuk mendapatkan adsorben daun kelapa dan selulosa, dan kemudian optimasi dilakukan untuk mengetahui kondisi optimum kedua adsorben dengan variasi massa adsorben, waktu kontak, dan pH larutan. Terakhir, karakterisasi dilakukan untuk mengetahui luas permukaan adsorben secara Methylene Blue method, jumlah situs aktif kedua adsorben dengan metode titrasi asam-basa, serta gugus fungsi dengan Fourier transform infrared (FTIR). Pada optimasi, diketahui bahwa kondisi optimum kedua adsorben adalah waktu optimum menit ke 15 dengan massa optimum adsorben 0,1 gram dan pH 4, dengan jumlah adsorbat yang teradsorpsi 10,6 mg/g untuk adsorben daun kelapa dan 10,7 mg/g untuk adsorben daun kelapa terdelignifikasi. Pada penentuan luas permukaan dihasilkan berturut-turut adsorben daun kelapa dan daun kelapa terlignifikasi 34,796 m2/g dan 31,867 m2/g, sedangkan jumlah situs aktif adalah 29,7258 x 1020 molekul /gram dan 28,0522x 1020 molekul/gram. Spektra FTIR menunjukan bahwa daun kelapa terdelignifikasi memiliki gugus OH yang sama dengan selulosa murni. Kata Kunci: adsorpsi, delignifikasi, limbah canang, Remazol Brillian Blue

ISOLASI CASHEW NUT SHELL LIQUID DARI KULIT BIJI JAMBU METE (Anacardium occidentale L) DAN KAJIAN BEBERAPA SIFAT FISIKO-KIMIANYA I N. Simpen
Jurnal Kimia (Journal of Chemistry) Vol. 2, No. 2 Juli 2008
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 (64.34 KB)

The research on the isolation of Cashew Nut Shell Liquid (CNSL) from seed husk of cashew nut by solidliquidextraction has been carried out. The extraction used mixture of chlorofom-ethanol (3:1, 1:1, 1:3) and hexaneethanol(3:1, 1:1, 1:3). The extract was analysed for its phisico-chemical properties namely density, viscosity, acidity,and iod number. The extract with highest rendement was analysed by GC-MS (gas cromatography-massspectrometry) and infrared (IR) spectrophotometer to prove that anacardic was the mayor component of CNSL.The highest rendement (44.38 %) was resulted from the extraction using 3:1 hexane-ethanol. The extract hasa density of 0.9352 g/mL, a viscosity of 8.98 pise, acid of 96.94 mg NaOH/g CNSL, and 86.98 g iod/100g CNSL.The GC-MS and IR analyses showed that the major component of CNSL was anacardic acid.

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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