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INDONESIA
VALENSI
Published by Universitas Islam Negeri Syarif Hidayatullah Jakarta
ISSN : 24606065     EISSN : 25483013     DOI : 10.15408/jkv
Core Subject : Science,
Chemistry
Jurnal Kimia Valensi is a biannual and peer-reviewed open access journal published by Department of Chemistry, Faculty of Science and Technology UIN Syarif Hidayatullah Jakarta. This journal covering all aspect of chemistry.
Arjuna Subject : Umum - Umum
Articles 425 Documents
 10   11   12   13   14 
Imobilisasi TiO2 ke dalam Resin Penukar Kation dan Aplikasinya sebagai Fotokatalis dalam Proses Fotoreduksi Ion Hg2+ Rosyid Ridho; Endang Tri Wahyuni; Suyanta Suyanta
Jurnal Kimia Valensi Jurnal Valensi Volume 3, No.2, November 2013
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (325.133 KB) | DOI: 10.15408/jkv.v3i2.505

Abstract

Abstrak Dalam rangka mengembangkan bahan fotokatalitis TiO2 pada penelitian ini telah dilakukan preparasi fotokatalis TiO2-Resin yang disertai dengan karakterisasi dan uji aktivitas untuk proses fotoreduksi ion Hg(II). Preparasi imobilisasi ini dilakukan dengan metode pertukaran ion yang di ikuti dengan kalsinasi pada suhu tertentu. Pada preparasi telah dipelajari pengaruh konsentrasi Titanium Isopropoksida sebagai sumber ion Ti(IV) terhadap TiO2-Resin yang dikarakterisasi dengan menggunakan Difraksi Sinar X (XRD) dan Thermografimetri (TGA). Pada proses fotoreduksi ion Hg(II) dipelajari pengaruh massa fotokatalis, kadar TiO2 yang terimobilisasi ke dalam resin, konsentrasi Ion Hg(II), dan pengaruh pH. Proses fotoreduksi dilakukan dalam suatu reaktor tertutup yang dilengkapi dengan lampu UV, yaitu dengan cara menyinari campuran yang terdiri dari larutan ion Hg(II) dan serbuk fotokatalis TiO2-Resin, disertai dengan pengadukan selama waktu tertentu. Hasil fotoreduksi dihitung berdasarkan selisih antara konsentrasi ion Hg(II) awal dengan ion Hg(II) yang tak tereduksi. Penentuan konsentrasi ion Hg(II) yang tak tereduksi dilakukan dengan menggunakan Spektrofotometer Serapan Atom (SSA) teknik pembangkitan uap dingin atau Cold Vapor Atomic Absorption Spectrophotometry(CV-AAS). Hasil preparasi menunjukkan semakin tinggi konsentrasi Titanium Isopropoksida yang ditambahkan pada resin semakin tinggi juga kadar TiO2 yang terbentuk pada TiO2-Resin. Hasil uji fotokatalis menunjukkan bahwa penggunaan fotokatalis TiO¬2-Resin dapat meningkatkan hasil fotoreduksi ion Hg(II) yang peningkatannya lebih tinggi dibandingkan TiO2 serbuk. Penambahan fotokatalis dengan massa yang semakin besar menambah efektivitas fotoreduksi terhadap ion Hg(II) yang semakin besar, namun jika ditambahkan massa fotokatalis yang lebih tinggi lagi akan menurunkan efektivitas fotoreduksi terhadap ion Hg(II). Kenaikan konsentrasi Hg(II) menyebabkan efektivitas fotoreduksi semakin rendah. Pada pH 1-4 terjadi kenaikan fotoreduksi pada ion Hg(II), akan tetapi pada pH yang lebih tinggi dari 4 menyebabkan terjadinya penurunan efektivitas fotoreduksi terhadap ion Hg(II).   Kata kunci : Fotokatalis, TiO2-resin, Ion Hg(II)   Abstract To develop TiO2 photoreduction photocatalyst in order to decrease the Hg(II) ion concentrate, in this research, it has been done the TiO2-Resin photocatalyst preparation with the characterization and application to Hg(II) ion photoreduction process. This preparation was done with ion exchange method which followed by studied calcinations at certain temperature. The preparation has been studied the influence of titanium isopropoxide concentrate toward TiO2-Resin which has been characterized by using X-Ray Diffraction(XRD) and Thermografimetry (TGA). In Hg(II) ion photoreduction process, it has been studied the influence of photocatalyst mass, the content of TiO2 which immobilized into sulfonated polystyrene (resin), the ion Hg(II) concentrate, and the pH influence. The photoreduction process has been done in the closed reactor that equipped by UV lamp, and uses the irradiating a mixture which contents of Hg(II) ion solution and TiO2-Resin photocatalyst powder, with the stirring at certain time. The result of photoreduction was calculated based on the difference between the earlier Hg(II) ion concentrate and unreduced Hg(II) ion. The determining of unreduced Hg(II) ion concentrate was done by using cold vapor atomic absorption spectrophotometry (CV-AAS). The preparation result showed that the higher isopropoxide titanium that was added into sulfonated polystyrene, the higher the content of TiO2 that was formed in TiO2-Resin. the result of photocatalyst test showed that the using using of TiO2-Resin photocatalyst can increase the result of Hg(II) ion photoreduction  which the increase is higher than TiO2 powder. The added of photocatalyst by the higher mass, adds the photoreduction effectiveness toward the Hg(II) ion. The higher the Hg(II) concentrate that added, the lower the photoreduction effectiveness. In pH 1-4, there is the photoreduction increase on Hg(II) ion, but in the highest pH that more than 4, it causes the decrease of the photoreduction effectiveness toward the Hg(II) ion.   Keywords : Photocatalyst, TiO2-resin, Hg(II) ion
Aktivitas AntioksidanWedelolaktondari Fraksi Etil Asetat daun Urang Aring (Eclipta alba (L.) Hassk) Trisna Yuliana
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 3, No. 2, November 2017
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (592.713 KB) | DOI: 10.15408/jkv.v0i0.6087

Abstract

Urang aring (Eclipta alba (L.) Hassk secara tradisional telah banyak digunakan sebagai tumbuhan obat. Daun urang-aring banyak digunakan untuk mengobati sesak nafas, sakit kepala, sakit gigi, bronkhitis, gangguan haid, dan sebagai penyubur rambut. Ekstrak dari tumbuhan urang aring dari berbagai jenis pelarut menunjukkan beberapa aktivitas seperti antioksidan dan antibakteri. Dalam penelitian ini telah dikaji uji aktivitas antioksidan dari wedelolakton murni hasil isolasi dari daun urang aring. Proses isolasi dilakukan secara konvensional menggunakan cara maserasi, partisi, dan kromatografi kolom serta dikarakterisasi dengan menggunakan KLT, LCMS dan spektroskopi UV-Vis dan NMR. Hasil percobaan menunjukkan, isolat wedelolakton mempunyai aktivitas antioksidan IC50 pada konsentrasi (5.6±0.5) ug/mLdidampingi dengan asam askorbat sebagai kontrol positif.Urang aring plants (Eclipta alba (L.)) Hassk  has been traditionally used as a medicinal plant. Leaf of urang-aring widely used to treat asphyxia, headache, toothache, bronchitis, menstrual disorders, and as a fertilizer hair. Extracts from Eclipta alba (L.) Hass plants from various types of solvents show some activities such as antioxidants and antibacterials. In this research has been studied antioxidant activity test from wedelolactone isolate resulted from Eclipta alba (L.) Hass leaves. The isolation process is carried out conventionally by means of maceration, partition, and column chromatography and characterized by TLC, LCMS and UV-Vis and NMR spectroscopy. The results showed that wedelolactone isolate had antioxidant activity of IC50 at concentration (5.6 ± 0.5) ppm.  
Kultivasi Chlorella, sp Pada Media Tumbuh Yang Diperkaya Dengan Pupuk Anorganik Dan Soil Extract Sri Yadial Chalid; Sri Amini; Suci Dwi Lestari
Jurnal Kimia Valensi Jurnal Valensi Volume 1, No.6, Mei 2010
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (94.878 KB) | DOI: 10.15408/jkv.v1i6.242

Abstract

Mikro alga jenis Chlorophyceae SP adalah alga laut yang menghasilkan zat gizi seperti asam lemaktak jenuh omega-3, 6, dan 9, serat, vitamin, protein dan mineral. Warna hijau dari klorofil padaChlorella,sp disebut darah hijau (green blood) mempunyai kandungan zat besi pembentukhemoglobin. Pada Chlorella,sp kering terdapat enzim Superoxide dismutase (SOD) sekitar 10.000-37.500 units per 10 gram yang merupakan anti radikal bebas untuk mencegah penuaan dini. Sementaraproduksi Chorophyceae secara alami masih terbatas, Untuk itu ada teknik budidaya alga denganmemanipulasi media hidup yaitu media sintetik. Penelitian ini adalah penelitian pendahuluan melihatpengaruh perlakuan media tumbuh terhadap pertumbuhan atau kepadatan sel dengan menggunakanHemaesitometry. Pupuk anorganik proanalis dan soil extract ditambahkan ke dalam wadah kultivasi.Chlorella, sp pada umur kultivasi 13 hari menghasilkan jumlah sel tertinggi sebanyak 7,7567 logsel/mL (5,7120x107 sel/mL. Chlorella, sp pada pupuk soil extract pada umur kultivasi 9 harimenghasilkan jumlah sel tertinggi sebanyak 5,7533 log sel/mL (5,6666x107 sel/mL). Lajupertumbuhan Chlorella,sp menunjukkan hasil paling baik pada media kultivasi yang menggunakanpupuk anorganik (conwy) dibandingkan dengan pupuk soil extract.
Preparation and Characterization Of Co3O4 Nano Powder Pepi Helza Yanti; Akmal Mukhtar; . Astarina
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 1, No. 2, November 2015
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (741.972 KB) | DOI: 10.15408/jkv.v0i0.3176

Abstract

Synthesis of Co3O4 has been done using Co(NH3)4.6H2O and KOH as precursors with molar ratio 1:1 M with precipitation method. Several of calcination temperature were done to learn type of mineral phase and crystalinity of Co3O4 synthesized. The XRD analysis revealed that calcination temperature influence crystalinity and mineral phase of Co3O4 prepared and calcination temperature at 700 oC has highest intensity and crystalinity that others. Analysis of particle size was examined using Schererr equation, and the results showed that particle size decrease with calcination temperature. The particle size at  700 oC was = 32.387 nm. Analysis morphology of Co3O4 was examined using SEM technique, and the result revelaed Co3O4 have nearly spherical.DOI :http://dx.doi.org/10.15408/jkv.v0i0.3176.
Synthesis of Graphene Oxide/Polypyrrole (GO/PPy) from Used Batteries as Electrodes in Supercapacitor Cells Muhammad Iqbal Qeis; Ferdian Rizki Amanda; Desi Listiani; Anthoni B Aritonang; Intan Syahbanu
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 5, No. 2, November 2019
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (637.255 KB) | DOI: 10.15408/jkv.v5i2.11714

Abstract

Fabrication with graphite-modified GO/PPy composites have been studied from used batteries using the Hummers method. This research was performance in four steps: graphite powder preparation, GO synthesis, GO/PPy composite synthesis, and supercapacitor cell manufacturing. The results of the study were characterized using X-Ray Diffraction (XRD) to see the character of the diffraction patterns formed by carbon batteries used before and after calcination and Fourier Transform Infra-Red (FTIR) to identify compound functional groups and conduct initial tests in the form of voltage, capacitance and life cycle by measuring charge and discharge times. The graphite preparation stage is carried out by the calcination method at 900°C to produce graphite with an angle of 2θ which is 26° with reflection from (d002). FTIR data showed that GO/PPy composites showed a successful combination of characteristics similar to pure polypyrrole and GO which included a broad absorption band located at 3500-2300 cm-1 which was estimated to be stretching the amine from polypyrrole and O-H group in the GO layer and the emergence of peaks new in the absorption band with a wave number 909 cm-1 is the CN vibration of the polymerized pyrrole. Meanwhile, based on the LCR meter measurement results in the best supercapacitor cells in the sampel GO/PPy ratio (3:10) with voltage value of 74.1 mV; a capacitance value of 15.14 µF and the best charge and discharge times.
Pengaruh Lama Inkubasi dan Variasi Jenis Starter Terhadap Kadar Gula, Asam Laktat, Total Asam dan pH Yoghurt Susu Kedelai Anna Muawanah
Jurnal Kimia Valensi Jurnal Valensi VOLUME 1, NO.1, NOVEMBER 2007
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (49.698 KB) | DOI: 10.15408/jkv.v1i1.206

Abstract

Telah dilakukan penelitian tentang pembuatan yoghurt susu kedelai, untuk mengetahuipengaruh jenis starter terhadap perubahan kadar gula, asam laktat, total asam dan pH padasusu hasil fermentasi. Sebagai perlakuan dalam penelitian ini adalah variasi starterLactobacillus bulgaricus dan Streptococcus thermophillus dan lama inkubasi. Parameteryang diuji meliputi Kadar gula, asam laktat dengan metode HPLC, total asam dengantitrasi dan pH dengan pH meter. Hasilnya menunjukkan bahwa Waktu inkubasimempengaruhi penurunan pH dan kenaikan konsentrasi total asam. Perbandingan variasijumlah dua starter yang digunakan tidak mempengaruhi proses perubahan komponen gulamenjadi asam laktat. Data HPLC menunjukkan bahwa komponen gula adalah sukrosa danlaktosa yang konsentrasinya menurun selama inkubasi dari 0 jam sampai 8 jam. Jenis Asamyang dihasilkan adalah asam laktat, dimana konsentrasinya mengalami peningkatan 0 jamsampai 8 jam, terutama pada sampel yang perbandingan starternya 1:3.
Penggunaan Biji Asam Jawa (Tamarindus indica L.) dan Biji Kecipir (Psophocarpus tetragonolobus L.) Sebagai Koagulan Alami Dalam Perbaikan Kualitas Air Tanah Hendrawati Hendrawati; Delsy Syamsumarsih; Nurhasni Nurhasni
Jurnal Kimia Valensi Jurnal Valensi Volume 3, No.1, Mei 2013
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (473.211 KB) | DOI: 10.15408/jkv.v3i1.326

Abstract

AbstrakPenggunaan Biji Asam Jawa (Tamarindus indica L.) dan Biji Kecipir (Psophocarpus tetragonolobus L.) Sebagai Koagulan Alami dalam Perbaikan Kualitas Air Tanah telah dilakukan. Penelitian bertujuan untuk mengetahui kemampuan serbuk biji asam jawa dan biji kecipir sebagai biokoagulan untuk memperbaiki kualitas air dan pengaruhnya terhadap parameter kualitas air, yang meliputi: temperatur, pH, konduktivitas, kekeruhan, oksigen terlarut, kandungan logam berat, dan total koliform. Hasil jar test diperoleh dosis optimum 0,009% (penurunan turbiditas 99,72%) untuk biji asam jawa dan 0,03% (penurunan turbiditas  92,03%) untuk ekstrak biji kecipir. Nilai pH optimum diperoleh pada pH 3 untuk kedua jenis biokoagulan. Penggunaan ekstrak biji asam jawa dan biji kecipir dan tidak memberikan pengaruh yang berarti terhadap parameter temperatur, pH, konduktivitas,dan logam berat. Penggunaan ekstrak biji kecipir dan biji asam jawa tidak menurunkan angka BOD. Ekstrak biji asam jawa mampu menurunkan angka total koliform sedangkan ekstrak biji kecipir tidak efektif dalam  menurunkan angka total koliform. Kata Kunci: Koagulasi, Asam jawa (Tamarindus indica L.), Kecipir (Psophocarpus tetragonolobus L.), Jar test, Air tanah, MPN.Abstrack The Use of Tamarind Seeds (Tamarindus indica L.) and Winged Bean Seeds (Psophocarpus tetragonolobus L.) As Natural Coagulant in Groundwater Quality Improvementhas been done. The aims of this study is to determine the ability of tamarind seeds and winged bean seeds as biocoagulant to improve water quality and its effect on water quality parameters, which include: temperature, pH, conductivity, turbidity, dissolved oxygen, heavy metal content, and total coliform. Jar test results obtained optimum dose of 0.009% (99.72% reduction in turbidity) to tamarind seeds and 0.03% (92.03% reduction in turbidity) to winged bean seeds. The optimum pH obtained at pH 3 for both types of biocoagulant. The use of tamarind seeds and winged bean seeds does not have much influence on the parameters of temperature, pH, conductivity, and heavy metals. They also did not reduce the number of BOD. Tamarind seeds reduce the number of  total coliform while winged bean seeds are not effective in reducing the number of total coliform. Keywords: Coagulation, Tamarind (Tamarindus indica L.), Winged bean (Psophocarpus tetragonolobus L.), Jar test, Groundwater, MPN. 
Pengaruh Jumlah Inokulum Sel Inang Bakteri E.coli BL21 (DE3) pLysS dan Waktu Overekspresi pada Produksi Protein Rekombinan Fim-C Salmonella typhi Muktiningsih Nurjayadi; Izzatul Ilma Chairinnisa; Geta Putri Mentari; Dudi Hardianto; Asri Sulfianti; Kurnia Agustini
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 4, No. 2, November 2018
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (920.016 KB) | DOI: 10.15408/jkv.v4i2.8077

Abstract

Recombinant protein Fim-C S.typhi is a potential protein that can be used as an alternative typhoid vaccine and produced on a large scale. However, before entering into a large-scale stage, laboratory optimum data on the factors that affect the production process of Fim-C Salmonella typhi proteins are required. This study aims to obtain information regarding the effect of host cell number E.coli BL21 (DE3) pLysS and overexpression time on production of recombinant protein Fim-C Salmonella typhi as the basis for developing candidate of typhoid vaccine. The optimization process of overexpression was done by adding 0.5 mM IPTG (Isopropyl-β-D-thiogalactopyranoside) inducer into bacterial cultures of 2%, 4%, and 6% with 4, 5, and 6 hours over expression. The measurement of the concentration of Fim-C recombinant protein extracted samples were done by a spectrophotometric method used BCA Kit Assay Thermo ScientificTM with wavelength 590nm. The characterization of those protein extracts was performed using SDS-PAGE method. The results from the study concluded that the number of 4% E.coli bacterial cells and four-hour overexpression time are the optimum condition of Fim- C Salmonella typhi characterized by the presence of high-intensity bands at ± 31 kDa.  
Polimerisasi Eugenol Minyak Daun Cengkeh Hasil Redistilasi, Ekstraksi, dan Fraksinasi Menggunakan Katalis Asam Sulfat Pekat Sudarlin Sudarlin; Winarto Haryadi
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 3, No. 1, Mei 2017
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (764.431 KB) | DOI: 10.15408/jkv.v3i1.4685

Abstract

Polymerization of purified eugenol from clove leaf oil using concentrated sulfuric acid as catalyst has been done in this research. Clove leaf oil was purified by vacuum redistillation, acid-base extraction, and vacuum fractionation to yield eugenol. The eugenol was polymerized with concentrated sulfuric acid in ratio 1: 2. Polyeugenol from eugenol of clove leaf oil resulted from redistillation, extraction, and fractionation is in solid form (yield: 88.14%); from redistillation and extraction is also in solid form (yield: 86.15%); from redistillation clove leaf oil is in gel form (yield: 100.29%). Structure of polyeugenol was determined by infrared spectrophotometer and characterized by thin layer chromatography (TLC). Molecular weight of the product was calculated by viscometry method.DOI: http://dx.doi.org/10.15408/jkv.v0i0.4685
Aktivitas Antibakteri Ekstrak Butanol Daun Mengkudu (Morinda citrifolia L) Dede Sukandar; Nani Radiastuti; Syarifah Utami
Jurnal Kimia Valensi Jurnal Valensi Volume 1, No.5, November 2009
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3072.359 KB) | DOI: 10.15408/jkv.v1i5.306

Abstract

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