Garuda - Garba Rujukan Digital

p-Index From 2020 - 2025

1.686

P-Index

This Author published in this journals

All Journal CAKRA KIMIA (Indonesian E-Journal of Applied Chemistry) Jurnal Kimia (Journal of Chemistry) Buletin Udayana Mengabdi Ecotrophic, Journal of Environmental Science KOVALEN: Jurnal Riset Kimia Indonesian Journal of Cancer Chimica et Natura Acta Indonesian Journal of Cancer Seminar Ilmiah Nasional Teknologi, Sains, dan Sosial Humaniora (SINTESA)

James Sibarani

Program Studi Kimia, FMIPA, Universitas Udayana

Author-ID : 2922189

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Education Electrical & Electronics Engineering Environmental Science Health Professions Immunology & microbiology Materials Science & Nanotechnology Medicine & Pharmacology Public Health Social Sciences

Published : 39 Documents Claim Missing Document

Claim Missing Document

Articles

Title

FOTODEGRADASI ZAT WARNA REMAZOL BRILLIANT BLUE DENGAN BENTONIT TERIMPREGNASI Fe2O3 Made Arie Kusuma Dewi; Iryanti Eka Suprihatin; James - Sibarani
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

Telah dilakukan penelitian mengenai fotodegradasi zat warna remazol brilliant blue dengan fotokatalis Fe2O3-bentonit dan sinar UV. Penelitian ini bertujuan untuk mengetahui konsentrasi katalis optimum, pH optimum larutan, waktu penyinaran optimum dengan sinar UV, dan efektivitas fotodegradasi zat warna remazol brilliant blue. Penentuan kondisi optimum fotodegradasi remazol brilliant blue dilakukan dengan variasi konsentrasi komposit Fe2O3-bentonit sebesar 50-300 mg untuk 25 mL larutan (b/v). Variasi pH larutan yang diteliti sebesar 4,0-10,0 dan variasi waktu penyinaran selama 1-6 jam. Efektivitas proses fotodegradasi ditentukan dengan memvariasikan konsentrasi larutan yaitu 50-500 ppm. Hasil penelitian menunjukkan bahwa kondisi optimum proses fotodegradasi remazol brilliant blue memerlukan 8 g/L fotokatalis Fe2O3-bentonit, pH larutan 6, dan waktu penyinaran dengan sinar UV selama 3 jam. Fotokatalis Fe2O3-bentonit pada kondisi optimumnya efektif untuk mendegradasi larutan remazol brilliant blue pada konsentrasi rendah

STUDI KOPOLIMERISASI GRAFTING ASAM AKRILAT (AA) PADA POLIETILEN (PE) DENGAN INISIATOR H2O2/Fe2+: SEBAGAI PENUKAR KATION I Gede D. Yudha Partama; Ida Ayu Raka Astiti Asih; James Sibarani
Jurnal Kimia (Journal of Chemistry) Vol. 5, No. 2 Juli 2011
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 (301.281 KB)

Cation exchanger have been prepared by graft copolymerization of acrylic acid (AA) onto a low density polyethylene (LDPE) with “grafting-on” method using Fenton reagent (H2O2/Fe2+) as initiator under nitrogen atmosphere at 280C. The percentage of grafting was determined by the gravimetric method. The percentage of grafting was influenced by monomer concentration, initiator concentration (H2O2), and the duration of grafting. The optimum conditions were obtained at 15% (v/v), 0.2 mL, and 8 hours for the monomer concentration, the volume of initiator H2O2 30%, and the duration of grafting respectively.Analysis of the PE-g-AA was conducted using Fourier Transform Infrared (FTIR) spectroscopy to confirm graft copolymerization which revealed the existence of new absorption peak at 1712,79 cm-1 and 2661,77 cm-1 assigned to C=O and O-H respectively. Characteristic of PE-g-AA film was tested by water uptake capability and cation exchange capacity toward Cu2+. The two characteristics were increased by percent grafting.

AKTIVITAS ANTIOKSIDAN EKSTRAK ETANOL KULIT JERUK KINTAMANI (Citrus aurantium L.) DALAM MENURUNKAN KETENGIKAN MINYAK KELAPA P Oka Sudiana; I M Oka Adi Parwata; J J Sibarani
Jurnal Kimia (Journal of Chemistry) Vol. 12 No.1 Januari 2018
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

Paper ini membahas penentuan aktivitas antioksidan dan pengaruh penambahan ekstrak etanol kulit buah jeruk kintamani (EEKBJK) dalam menurunkan ketengikan minyak kelapa yang sudah dipanaskan pada suhu 200oC, 250oC, 300oC selama 5 menit kemudian didiamkan selama 3 hari.Kerusakan pada minyak kelapa dilihat dari nilai bilangan peroksida, bilangan asam dan kadar asam lemak bebas. Hasil pengukuran aktivitas antioksidan menunjukkan bahwa IC50 dari EEKBJK sebesar 53,71 mg/L. Hal ini menunjukkan EEKBJK mampu sebagai antioksidan. Penurunan masing-masing bilangan peroksida minyak kelapa dengan penambahan EEKBJK 0,02% b/v adalah 50,19%, 31,74% dan 16,01%. Penurunan masing-masing bilangan asam minyak kelapa dengan penambahan EEKBJK 0,02% b/v adalah 29,55%, 28,21% dan 18,42%. Penurunan masing-masing kadar FFA minyak kelapa dengan penambahan EEKBJK 0,02% b/v adalah 29,55%, 28,21% dan 18,42%.

AKTIVITAS PROTEASE PADA GETAH BAGIAN BATANG DARI TIGA JENIS SPESIES TANAMAN KAMBOJA (Plumeria L) K. Ratnayani; M. Nazib; J. Sibarani; A.A.I.A M. Laksmiwati
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 bertujuan untuk melakukan uji aktivitas protease pada getah bagian batang dari tiga spesies tanaman kamboja yaitu Plumeria rubra L, Plumeria obtusa L dan Plumeria pudica Jacq yang banyak dibudidayakan di wilayah Bali. Pengujian aktivitas protease dilakukan secara spektrofotometri (metode Kurnitz termodifikasi) menggunakan kasein sebagai substrat. Hasil penentuan aktivitas protease pada tiga spesies tanaman kamboja menunjukkan bahwa spesies Plumeria rubra L. memiliki aktivitas protease rata-rata relatif lebih tinggi yaitu 0,0398 ± 0,00034 U/mL, disusul oleh spesies Plumeria pudica Jacq. yaitu 0,0371 ± 0,00019 U/mL, dan Plumeria obtusa L. yaitu 0,0365 ± 0,00032 U/mL. Spesies Plumeria rubra L. merupakan jenis tanaman kamboja yang paling umum, memiliki paling banyak varietas dan paling banyak dibudidayakan di wilayah Bali dibandingkan spesies lainnya. Dari hasil penelitian ini dapat diketahui bahwa jenis ini berpotensi sebagai sumber protease alternatif. Kata kunci: aktivitas protease, getah kamboja, tiga spesies

PEMANFAATAN ARANG BATANG PISANG (Musa paradisiacal) UNTUK MENURUNKAN KESADAHAN AIR Ni Made Shinta Megawati; Anak Agung Bawa Putra; James Sibarani
Jurnal Kimia (Journal of Chemistry) Vol. 7, No. 2 Juli 2013
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

The study about utilization of char made from banana (Musa paradisiacal) to reduce water hardness had been carried out. In this study, the surface area, equilibrium time of adsorption of metal ions, adsorption isotherm, capacity of adsorption, and the effect of pH on metal ions adsorption were used as parameters. Futher the optimum conditions were used to reduce the water hardness. The results of this study showed that the surface area, capacity of adsorption on Ca from 100 ppm solution were 3.3932 m2/g and 2.8112 mg/g respectively with equilibrium time of 90 minutes. Whereas, the capacity of adsorption on Mg2+from 75 ppm solution was 2.3371 mg/g with equilibrium time of 90 minutes. The adsorption capacity increased to the highest value at pH 7 which were 4.1197 mg/g and 3.0210 mg/g for Ca2+and Mg2+ respectively. The value of total hardness of water samples decreased by 63.057 mg/L in 4 hours contact time.

KARAKTERISASI ZEOLIT MANGAN TERMODIFIKASI TiO2 SERTA APLIKASINYA SEBAGAI FILTER GAS BUANG KENDARAAN BERMOTOR DALAM PENURUNAN KADAR GAS CO, HC, DAN Pb I. A. G. Widihati; I. Apriliyanto; J. Sibarani
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.p15

Modifikasi zeolit mangan dengan TiO2 sebagai filter gas buang kendaraan bermotor telah berhasil dibuat dengan mencampurkan zeolit mangan dan TiO2 serta Poly Vinyl Alcohol (PVA) sebagai perekat. Pembuatan filter dilakukan dengan metode reaksi padat-padat (solid State Reaction) kemudian dikarakterisasi struktur dan kristalinitas kristal menggunakan X-Ray Diffraction (XRD) dan morfologi serta komposisi kimia menggunakan Electron Microscopy - Energy Dispersive Spectroscopy (SEM-EDS). Hasil karakterisasi XRD dan SEM-EDS menunjukan bahwa penambahan TiO2 tidak mempengaruhi struktur kristal dari zeolit mangan yang dapat dilihat dari tidak adanya perubahan dspacing yang spesifik dan tidak terjadi pergeseran sudut 2?, namun terjadi penurunan intensitas puncak difraksi yang menandakan adanya penurunan persen massa salah satu komponen zeolit mangan yakni SiO2. Selanjutnya dilakukan pengujian performa filter dalam penurunan kadar gas CO dan HC menggunakan Gas Analyzer dan Spektrofotometer Serapan Atom dalam pengukuran Pb. Hasil pengujian menunjukkan bahwa filter hasil modifikasi zeolit mangan dengan TiO2 dapat menurunkan kadar CO, HC dan Pb, dimana dengan filter tanpa penambahan TiO2 dan dengan penambahan TiO2 10 dan 20% secara berturut-turut menurunkan kadar CO sebesar 48,29; 58,14; 58,00%; kadar HC sebesar 27,83 ; 37,97 ; 45,81 % ; dan kadar Pb sebesar 90,74 ; 92,08 ; 93.48%. Kata kunci: Hidrokarbon, Karbonmonoksida, Timbal, TiO2, Zeolit mangan

ADSORPSI ION LOGAM Pb2+ DAN Cu2+ OLEH BENTONIT TERAKTIVASI BASA (NaOH) Putu Aprilliana Indah Kumala Dewi; Putu Suarya; James Sibarani
Jurnal Kimia (Journal of Chemistry) Vol. 9, No. 2 Juli 2015
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 is to determine the adsorption capacity of NaoH activated bentonites in reducing metal ions Pb2+ and Cu2+ from their solutions. The characterization of the activated bentonites was carried out by determining the specific surface area using methylene blue adsorption method, the numbers of the active site by acid-base titration, and determining the basal spacing using X-ray diffraction (XRD). Adsorption parameters such as contact time, pH, and the isotherm adsorption curves were determined by atomic absorption spectrophotometer (AAS). The specific surface area and the number of active sites of the NaOH-activated Bentonite were 22.1017 m2/g and 32.8716 x 1020 atoms/g respectively. This vakue was higher than non-activated ones which were 12.6602 m2/g and 31.5847 x 1020 atoms/g respectively. The optimum condition of Pb2+ adsorption on activated bentonite was obtained at pH 3 with contact time under 5 minutes following the Langmuir isoterm pattern while the optimum condition of Cu2+ adsorption was obtained at pH 4 with contact time under 5 minutes following the Langmuir isoterm adsorption suggesting that the adsorption took place by chemical adsorption. The adsorption capacities of Pb2+ and Cu2+ were 185.50 mg/g and 30.00 mg/g respectively.

STUDI FOTODEGRADASI CONGO RED MENGGUNAKAN UV/ZnO/REAGEN FENTON Ni Luh Putu Widiantini; James Sibarani; Manuntun Manurung
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 study of photodegradation of Congo Red using UV light, with addition ZnO catalyst, H2O2 and Fe2+ has been carried out. This study included the determination of optimum amount of ZnO, H2O2, Fe2+, pH optimum and the determination of system which shows the most effective in Congo Red photodegradation. The results showed that the optimum conditions to degradate 100 ppm of Congo Red solution were 60 mg of ZnO, 4 ml of H2O2 (0,0392 mol), 20 mg FeSO4 (0,0013 mol) and pH 5. The highest percentage of degradation was 93,6093 + 0,12 % reached using UV/ZnO/H2O2/ Fe2+ system at 5 hour photodegradation time. In this processes addition of ZnO, H2O2, and FeSO4, and pH were important parameters to increase the percentage of photodegradation.

Co-Authors A. A. Bawa Putra Anak Agung Istri Agung Mayun Laksmiwati Arik Agustina Arisma Damayanti Dewa Ayu Ika Pramitha Dewi Yuliana Diah Prihatiningsih Didik Setiawan Dina Lindawati Purba Emmy Sahara Ermin Riskiani Gede Widihati, Ida Ayu Gusti Ayu Dewi Lestari I Gede D. Yudha Partama I Made Dira Swantara I Made Oka Adi Parwata I Nengah Wirajana I Putu Mahendra I W BUDIARSA SUYASA I Wayan Suarsa I. A. Gede Widihati I. A. R. Astiti Asih I. Apriliyanto I. P. W. Gautama I. W. Sumarjaya I. W. Sumarjaya I.G.A. Wibawa I.W. Sumarjaya Ika Paramitha, Dewa Ayu Irdhawati Irdhawati Iryanti Eka Suprihatin Ketut Ratnayani M. Joni M. Nazib Made Arie Kusuma Dewi Made Rai Rahayu Manuntun Manurung Marsela Luruk Bere Martha Zulfihardini Martin Joni Ni Luh Kasih Ariani Ni Luh Putu Widiantini Ni Made Puspawati Ni Made Shinta Megawati Ni Made Suaniti Ni Nyoman Rupiasih Ni Putu Rahayu Kusuma Pratiwi Ni Putu Widyana Kartini Nyoman Sudarma Oscar Yonathan Hambiyono P Oka Sudiana Pande Made Desy Ratnasari Pramesti , Resia Yoan Puspaningtya, Theresia Hellen Renata Putu Aprilliana Indah Kumala Dewi Putu Suarya Sarawinda Hutagalung Sophia Maria Oliva Lau Tri Madesa Patadungan Wirajana, Nengah WIWIK SUSANAH RITA

Title Search

Found 8 Documents Search Journal : Jurnal Kimia (Journal of Chemistry)

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title

Found 8 Documents
Search
Journal : Jurnal Kimia (Journal of Chemistry)