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All Journal Jurnal Ilmu Dasar BERKALA SAINSTEK Pelita Perkebunan UNEJ e-Proceeding ALCHEMY Jurnal Penelitian Kimia J-Dinamika: Jurnal Pengabdian Kepada Masyarakat Social, Humanities, and Educational Studies (SHEs): Conference Series Jurnal Pengabdian Masyarakat IPTEKS JIIP (Jurnal Ilmiah Ilmu Pendidikan) Computational and Experimental Research in Materials and Renewable Energy (CERiMRE) JOLLT Journal of Languages and Language Teaching Journal of Agriculture and Applied Biology Journal of Agriculture and Applied Biology ( JAAB) Studies in English Language and Education Indonesian Chimica Letters InSTEM al Kimiya : Jurnal Ilmu Kimia dan Terapan Jurnal Ilmiah Bisnis, Manajemen, dan Akuntansi

Dwi Indarti

Jurusan Kimia Fakultas MIPA, Universitas Jember

Author-ID : 286599

Religion Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Energy Environmental Science Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Physics Social Sciences Other

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Effect of pH in Coagulation Bath on Polysulfone-based Membrane Formation and Its Performance Characteristics Dwi Jayanti, Denik; Asnawati, Asnawati; Indarti, Dwi; S. Purwo Handoko, Donatus; Piluharto, Bambang
Indonesian Chimica Letters Vol. 1 No. 1 (2022)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, University of Jember

One of the factors that determine the formation of the membrane is the solution in the coagulation bath (non-solvent). In this study, the effect of pH treatment on the coagulation bath solution on membrane formation and its effect on membrane performance will be studied. The pH of the coagulation bath used was pH 1, 6.8 and 12. As the results, physically the three pH treatments produced the same white (opaque) membrane. Through morphological analysis, it appears that the three pH treatments produced an asymmetric membrane consisting of a top layer and a sublayer. The surface of the membrane with pH 1 treatment showed a denser surface than the pH 6.8 and pH 12 treatments. The results of the membrane performance characterization showed that the membrane permeability coefficient of the membrane with pH treatment was in the following order pH 1 < pH 12 < pH 6.8. While the value of the rejection coefficient showed that the membrane treated at pH 1 did not detect rejection because there was no permeate coming out, while at the treatment at pH 6.8 and 12, the rejection coefficient values were 74% and 76%, respectively.

The Permeation of High Concentration Hydrogen Sulfide (H2S) Gas Using PTFE (Polytetrafluoroethylene) and PVDF (Polyvinylidene Fluoride) membranes Asnawati, Asnawati; Diah Ayu Nur Sholehah; Dwi Indarti; Tri Mulyono; Bambang Piluharto; Muflihah, Yeni Maulidah
Indonesian Chimica Letters Vol. 1 No. 2 (2022)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, University of Jember

Hydrogen sulfide (H2S) is a toxic, corrosive, and flammable gas. The presence of H2S gas can be reduced by a permeation method using PTFE (Polytetrafluoroethylene) membranes and PVDF (polyvinylidene fluoride) membranes. This H2S gas passed through the membrane and was then captured by the SAOB (Sulfide Anhydride Oxidant Buffer) in S2- species form. A visible spectrophotometer was applied for the analysis of passed H2S gas. Using a PTFE membrane, the optimum flow rate was obtained at 14.71 mL/min, with a mass flux of 0.825 kg/m2.hour, permeability coefficient of 0.696 kg/m2.hour.bar, and percent removal of H2S gas was 88.14%. The optimum flow rate for the SAOB was obtained at a rate of 0.30 mL/min with a mass flux of 0.843 kg/m2.hour and a percent removal of H2S gas of 89.98%. Based on the results obtained on the PVDF membrane, the mass flux produced in the optimization of H2S gas is 0.742 kg/cm2.hour, and the optimization of the SAOB solution is 0.754 kg/cm2.hour. The resulting permeability coefficient value is 0.741 kg/cm2.hour. The results indicate that this study can remove H2S gas at the optimum H2S gas flow rate of 4.76 mL/minute of 94.89% and the optimum SAOB flow rate of 0.3 mL/minute of 95.66%

Characterization of Polysulfone Membrane with Variation of Ethanol Concentrations in Coagulation Bath for Ultrafiltration Membrane Indarti, Dwi; Henry Adi Syahputra Sidabutar; Handayani, Wuryanti; Piluharto, Bambang
Indonesian Chimica Letters Vol. 2 No. 1 (2023)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/icl.v2i1.366

The aim of this research is to study influence of ethanol concentrations in coagulation bath to charecteristic of physical properties and polysulfone membrane performance. Ethanol concentrations that used is 0; 40; 50; 60 ; 70; 80; 90 %. Process of making for polysulfone ultrafiltration membrane is prepared with phase inversion technique. Polysulfone membrane is made from polysulfone solved in N,N- dimetilacetamida (DMAc) and additive poly(ethylene glikol) (PEG) 600 in proportion 18 %: 77 %: 5 %. The result showed that increasing ethanol concentrations causes the increasing of density and increase concentrations from 0 - 50 % causes increasing swelling degree, but decreasing swelling degree from concentrations 60 - 90 %. However influence of ethanol concentration in coagulation bath to membrane performance is increasing of water flux, permeability coefficient, and rejection coefficient to dextran. It based on of result that polysulfone membrane with ethanol concentrations 80 dan 90 % included membrane classification ultrafiltration by rejection coefficient value above 90 %.

Study of The Effect of Concentration on The Level of Wetness in Chicory Leaves Using The ADSA-Overlay Method Mulyono, Tri; Ahmad Turidi; Bambang Piluharto; Dwi Indarti; Sudarko; D. Iwan Setiawan
Indonesian Chimica Letters Vol. 3 No. 1 (2024)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/icl.v3i1.762

It is challenging to distinguish between farmers and insecticides. Chemicals called pesticides are applied to eliminate pests in order to boost agricultural production for farmers. Using the Axisymmetric Drop Shape Analysis (ADSA)-Overlay approach, this study attempts to investigate the impact of the pesticide fipronil concentration on the degree of wetness in mustard leaves. The size of the contact angle between the mustard leaf surface and the pesticide solution determines the pesticide's wetting action. The cosine of the contact angle (θ) between the liquid insecticide and the solid surface determines the surface tension (γ). Sessile drop is the method used to assess surface tension. Chicory is the surface area that comes into touch with pesticide drops. At 25oC samples containing 50 ppm were poured onto mustard leaves using a syringe. A digital microscope that was linked to a personal computer was used to capture sessile drop pictures. Three iterations of sessile drop imaging were conducted using samples at temperatures of 27, 29, 31, 33, and 35oC. Samples of pesticide solution at concentrations of 75, 100, 125, and 150 ppm were photographed again. The reagent 50Sc pesticide's wetting level rises with an increase in fipronil content. As concentration increases, the reagent 50Sc insecticide solution's contact angle tends to get smaller.

Effect of Addition of Monosodium Glutamate (MSG) on Coagulation Basin to Characteristics of Cellulose Acetate Membranes Rofiqoh, Siti; Indarti, Dwi; Piluharto, Bambang
Jurnal ILMU DASAR Vol 17 No 2 (2016)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

The aim of recearch is study the effect of MSG in coagulation basin on cellulose acetat membranes properties. It was preparated by phase inversion technique. As the result showed that the higher the concentration of MSG in coagulation basin, which is character of membrane permeability coefficients and lower water flux. Dextran rejection of 11, 40, 100-200, and 500 kDa increased. The morphology analysis has shown that sub layer membranes structure with 2% MSG addition more uniform than 0,5% MSG addition.Keywords: cellulose acetat, phase inversion, MSG, coagulation basin

Utilization of Supported Liquid Membrane (SLM) in Separation of Pb(II) by Varying Concentration of Carrier and Feed Solution Indarti, Dwi; Novitasari, Novitasari; Sulistyo, Yudi Aris
Jurnal ILMU DASAR Vol 18 No 2 (2017)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

Supported liquid membrane (SLM) was prepared by reacting host material with carrier compounds. Carrier compound was Polyethylene Glycol-400 (PEG-400) that have been used with the variation of concentration 0, 2, 4, and 6%. The effect of its variations in SLM was characterized by FTIR and the performance was examined by transporting feed solution Pb(NO3)2 with variation 1, 5, 10, 15, and 25 ppm for 3 hours in pH 3. FTIR spectra depicted that the increasing concentration of PEG would arise the intensity of typical PEG’s functional groups such as -OH, C-O-C, and CH2-CH2 sp3. The optimum transport Pb(II) was achieved by SLM with 6% PEG. Variation of feed solution concentration showed the main effect in SLM activity. The higher of feed solution concentration would decrease of transport activity. The % extract and % recovery 1 ppm was higher than 25 ppm with 72,5% and 70,27% than 6,1% and 3,59%, respectively. Keywords: supported liquid membrane, Pb(II), poly ethylene glycol, extraction and recovery, carrier compound

PENGARUH PENAMBAHAN SURFAKTAN ANIONIK SODIUM DODESIL SULFAT TERHADAP KARAKTERISTIK MEMBRAN SELULOSA ASETAT Buana, Eka Surya; Indarti, Dwi; Asnawati, Asnawati
BERKALA SAINSTEK Vol 2 No 1 (2014)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar

Penelitian ini telah dilakukan tentang pengaruh penambahan surfaktan anionik sodium dodesil sulfat terhadap: sifat fisik membran selulosa asetat (densitas, derajat swelling), sifat kimia membran selulosa asetat (IR, sudut kontak), kinerja membran selulosa asetat (koefisien permeabilitas dan koefisien rejeksi dekstran). Selulosa asetat (CA) dimodifikasi dengan menambahkan SDS (sodium dodecl sulphate) yang befungsi sebagai agen pembentuk pori dan meningkatkan sifat hidrofilisitas membran. Preparasi membran selulosa asetat dilakukan dengan metode inversi fasa. Modifikasi membran selulosa asetat dilakukan melalui dua tahap, meliputi: Preparasi membran selulosa asetat dengan menambahkan SDS ke dalam larutan polimer membran dan karakterisasi membran selulosa asetat. Hasil penelitian ini menunjukkan membran hasil modifikasi dengan komposisi 2% SDS, 16% CA mempunyai pori yang lebih rapat. Hasil pengukuran kerapatan, derajat swelling, Uji FTIR, sudut kontak fluks dan rejeksinya berturut-turut sebagai berikut: 0,3916 gr/cm3, 4, 96 %, hasil uji IR menunjukkan adanya interaksi ikatan van der waals antara CH3-CH3 dan ikatan hidrogen antara OH-SO4,, 62o(sedikit hidrofilik), 7,6191 (L/m2.jam) dan 65,02 %. Kata Kunci: Selulosa Asetat, SDS, Sudut Kontak, Inversi Fasa

Optimalisasi Adsorpsi Zat Warna Rhodamin B Pada Hemiselulosa Dalam Sistem Dinamis Putri, Sella August; Asnawati, A.; Indarti, Dwi
BERKALA SAINSTEK Vol 7 No 1 (2019)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v7i1.9681

Hemiselulosa digunakan sebagai adsorben alternatif untuk adsorpsi Rhodamin B. Penelitian ini bertujuan untuk menentukan kapasitas adsorpsi hemiselulosa terhadap rhodamin B dengan optimasi massa adsorben dan pH larutan. Kapasitas adsorpsi hemiselulosa ditentukan dengan sistem dinamis dengan kecepatan 0,08 mL/menit melalui kolom berdiameter internal 8 mm dan menggunakan persamaan Thomas. Hasil penelitian menunjukkan bahwa banyaknya zat warna Rhodamin B yang teradsorpsi pada adsorben hemiselulosa mengalami peningkatan dengan bertambahnya massa adsorben. Adsorben hemiselulosa dapat menyerap zat warna Rhodamin B paling baik pada massa adsorben 0,5 gram dan pH larutan 7,34, dengan kapasitas adsorben hemiselulosa sebesar 0,047 mg/g.

PENGARUH VARIASI KONSENTRASI DAN pH ASAM LARUTAN SODIUM DODESIL SULFAT TERHADAP PROSES PEMISAHANNYA PADA MEMBRAN SELULOSA ASETAT Farida, Elis Nur; Indarti, Dwi; Oktavianawati, Ika
BERKALA SAINSTEK Vol 2 No 1 (2014)
Publisher : Universitas Jember

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Penelitian ini telah dilakukan dengan mempelajari pengaruh konsentrasi dan pH larutan asam surfaktan anionik natrium lauril sulfat terhadap pemisahanya pada membran ultrafiltrasi terhadap: kinerja membran selulosa asetat (fluks NaLS dan rejeksi NaLS). Preparasi membran selulosa asetat dilakukan dengan metode inversi fasa. Konsentrasi NaLS yang digunakan di bawah KKM (0,001-0,003M) dan pH asam(3-6). Hasil pengukuran KKM pada pH 3, 4, 5, 6 adalah sebagai berikut: 0,00398 M; 0,00469 M; 0,00571 M; 0,00669 M. Hasil uji kinerja membran tertinggi fluks, koefisien rejeksi dan massa teradsorb berturut-turut adalah sebagai berikut: NaLS 0,001 M pH 3 0,855 (L/m2jam); 0,003 M pH 6 99,646 %: 0,0408 g. Kata kunci: natrium lauril sulfat, konsentrasi kritis misel, selulosa asetat

Purification of Xylooligosaccharide From Casavva Pulp by Ultrafiltration Method Ratnadewi, Anak Agung Istri; Fauziyah, Kamelia Rizqi; Indarti, Dwi
BERKALA SAINSTEK Vol 9 No 2 (2021)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v9i2.23388

Xylan is the main component of hemicellulose. Xylan can be extracted from agricultural waste, such as cassava pulp. Xylan is used as an endo-β-1,4-D-xylanase substrate to produce impure xylooligosaccharides (XOS)This study aims to purify XOS from cassava pulp using the ultrafiltration method. The components of XOS obtained from the enzymatic hydrolysis were analyzed using thin layer chromatography (TLC) and densitometry methods. In addition, the XOS was purified by the ultrafiltration method using a cellulose membrane with a Molecular Weight Cut Off (MWCO) of 12 kDa. The permeate obtained from the purification results was also analyzed using TLC and densitometry. The results of this study indicated that the components in XOS cassava pulp before and after purification by the TLC method were X5 and X6, while the XOS components before and after purification by the densitometric method were X3, X4 and X5.

Co-Authors A Asnawati Agus Wedi Pratama Ahmad Turidi Amiyati, Dewi Rara Anak Agung Istri Ratnadewi Apriliana, Gepsa Apriliasari, Yekti Asnawati Asnawati Asnawati Asnawati Asnawati Asnawati, A. Badrut Tamam Ibnu Ali Bambang Bambang Ahmad Indarto Bambang Piluharto Bambang Piluharto Busroni, Busroni Christine Manara D. Iwan Setiawan Denny Trias Utomo, Denny Trias Dharmawan, Aditya Dwiki Diah Ayu Nur Sholehah Dwi Jayanti, Denik DWI SURYANTO Eka Surya Buana, Eka Surya Elis Nur Farida, Elis Nur Fatwa, Muhammad Iqbal Fauziyah, Kamelia Rizqi Firmanto, Hendy Fitri Dwi Jayanti Gembong Kesuma B HARDIAN SUSILO ADDY Henry Adi Syahputra Sidabutar Heny Yunita Novianti I Nyoman Adi Winata Ika Oktavianawati Irmawati, Nurisda Eva Khofifah, Marhamatul Komsiyah, Komsiyah Kristi, Maganda Ananda Marahayu, Mustika Muhammad Firdaus Muhammad Reza Nanda Widayanti Neran Neran Novita Andarini Novitasari Novitasari Nurlia, Vera Priza Pandunata Purwatiningsih Purwo Handoko, Donatus Setyawan Putri, Sella August Putri, Sella August Rizqon Rizqon S. Purwo Handoko, Donatus Siti Nur Jannah Siti Rofiqoh, Siti Sudarko Sulistyo, Yudi Aris Sulistyowati, Fitri Tanti Haryati Tinok Dwi Ananda Tri Mulyono Tri Mulyono Ula, Mohammad Munal Wuryanti Handayani Yeni Maulidah Muflihah Yudi Aris Sulistiyo, Yudi Aris Zulfikar Zulfikar

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