Garuda - Garba Rujukan Digital

p-Index From 2021 - 2026

1.405

P-Index

This Author published in this journals

All Journal Jurnal Penelitian Saintek JURNAL KIMIA SAINS DAN APLIKASI Jurnal Pengajaran MIPA Pharmaciana: Jurnal Kefarmasian Jurnal Pengajaran Matematika dan Ilmu Pengetahuan Alam Jurnal Zeolit Indonesia JC-T (Journal Cis-Trans): Jurnal Kimia dan Terapannya Chimica et Natura Acta Indonesian Journal of Chemistry Chemistry Indonesian Journal of Chemical Research Molekul: Jurnal Ilmiah Kimia Jurnal Ilmiah Berkala: Sains dan Terapan Kimia Makara Journal of Science Molekul: Jurnal Ilmiah Kimia Bulletin of Chemical Reaction Engineering & Catalysis

Eko Sri Kunarti

UGM

Author-ID : 301057

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Decision Sciences, Operations Research & Management Education Engineering Environmental Science Materials Science & Nanotechnology Mathematics Medicine & Pharmacology

Published : 24 Documents Claim Missing Document

Claim Missing Document

Articles

1 2 3

KINETICS AND BALANCE ADSORPSI ION KROMIUM (III) IN SOLUTIONS ON SILICA AND COMPOUND MODIFICATION OF SILICA RESULTS SYNTHESIS FROM GREEN RICE DRINKS Siti Sulastri; Nuryono Nuryono; Indriana Kartini; Eko Sri Kunarti
Jurnal Penelitian Saintek Vol 19, No 2: Oktober 2014
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

This study will examine the nature of silica and modified silica in the interaction with Cr (III) ion as an adsorbate. Properties that will be studied are kinetics and equilibrium of Cr (III) adsorption in solution. Studies begins with determining the existence of Cr (III) ion in solution at various pH values, the presence of adsorbent at various pH values, and the adsorption of Cr (III) ion in solution by the adsorbent at various pH values. Based on this data set also can determined some values, e.g the maximum adsorption capacity (notated as Qmax), and the equilibrium constant, the RL value that determined the nature of adsorption were favorable or not favorable. Similarly to the Freundlich isotherm. Adsorption kinetic and equilibrium were performed at pH 5. Each adsorbent has a different kinetic model. All of adsorbents has compatibility with Langmuir 2 isotherm model, and on these condition had favorable adsorption of Cr (III) ion. The highest Qmax value is at HSSN. In the Freundlich isotherm model can be stated that all of the adsorbent is favorable for the adsorption process of Cr (III) ion in solution..

THE EFFECT OF NaOH CONCENTRATION AND TEMPERATURE ON ZEOLITE SYNTHETIS FROM FLY ASH BY HIDROTHERMAL ALKALI Jumaeri Jumaeri; Sutarno Sutarno; Eko Sri Kunarti; Sri Juari Santosa
Jurnal Zeolit Indonesia Vol. 8 No. 1 (2009)
Publisher : Jurnal Zeolit Indonesia

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

Zeolite synthesis from coal fly ash PLTU Tanjung Jati Japara was conducted by hydrothermal alkali. Preparation was done on fly-ash that has been refluxed with 1M of HCl and without refluxed. NaOH with certain concentration (2, 3, and 4M) was mixed with coal fly-ash by ratio 10 ml each 1 gram of fly ash into Teflon tube 100 ml at autoclave stainless-steel. Then, autoclave was heated on the oven at temperature of 120-1600C. Synthetic zeolite ouput was qualitative tested by using infrared spectroscopy, X-Ray diffraction, and SEM. The result showed that NaOH concentration, temperature, and hydrothermal alkali period of coal fly ash was affecting characterization of zeolite ouput. The temperature which use for optimally hydrothermal processes exist on range 140 "“160oC. The increase of temperature causes improving crystallization of zeolite products. Hydrothermal synthetic product from fly ash is alumina-silica compound which are a mixture of some crystals such as P zeolite, Y zeolite, sodalite, mullite, and quartz.

KARAKTERISTIK PENGIKATAN ION Cd(II) dan Cu(II) DALAM PEMBUATAN HIBRIDA AMINO-SILIKA IMPRINTED IONIK Buhani Buhani; Narsito Narsito; Nuryono Nuryono; Eko Sri Kunarti
Jurnal Sains dan Terapan Kimia Vol 5, No 2 (2011)
Publisher : Program Studi Kimia, Universitas Lambung Mangkurat

Karakteristik pengikatan ion Cd(II) dan Cu(II) pada polimer imprinted ionik (PII) dari hibrida amino-silika (HAS) yang disintesis menggunakan senyawa 3- aminopropiltrimetoksisilan (3-APTMS) dengan tetraetil ortosilkat (TEOS) sebagai prekursor telah dipelajari. Kontribusi pengikatan ion Cd(II) dan Cu(II) pada sintesis material HAS imprinted ionik Cd(II) dan Cu(II) didominasi oleh interaksi kimia melalui interaksi elekstrotatik sebesar 43,06 ± 0,42 % untuk Cd-HAS dan 40,96 ± 0,21% untuk Cu-HAS, sedangkan pembentukan ikatan kovalen sebesar 50,91 ± 0,25 % untuk Cd-HAS dan 54,87 ± 0,20 % untuk Cu- HAS. Kata kunci : Imprinted ionik, hibrida amino-silika, 3-aminopropiltrimetoksisilan

SINTESIS DAN KARAKTERISASI SILIKA GEL DARI ABU SEKAM PADI YANG DIIMOBILISASI DENGAN 3-(TRIMETOKSISILIL)-1-PROPANTIOL Dwi Rasy Mujiyanti; Nuryono Nuryono; Eko Sri Kunarti
Jurnal Sains dan Terapan Kimia Vol 4, No 2 (2010)
Publisher : Program Studi Kimia, Universitas Lambung Mangkurat

Telah dilakukan sintesis dan karakterisasi hibrida merkapto silika (HMS) yang diperoleh dari hasil pengolahan abu sekam padi(ASP) dari daerah Jambidan, Banguntapan, Bantul.HMS dibuat dengan menambahkan HCl 3M pada campuran senyawa 3- (trimetoksilil)-1-propantiol (TMSP) dan larutan Na2SiO3 yang dihasilkan dari peleburan ASP dengan NaOH hingga pH 7 (netral). Karakterisasi hasil dilakukan dengan spektroskopi inframerah (FTIR) dan difraktometer sinar-X (XRD).Hasil karakterisasi dengan FTIR mengindikasikan keberhasilan pembuatan HMS dengan munculnya serapan dari gugus-gugus fungsional seperti : gugus metilen (-CH2-), silanol (Si-OH) dan siloksan (Si-O-Si). Dari data XRD diketahui bahwa HMS yang terbentuk mempunyai struktur amorf.Kata kunci : Adsorben, hibrida merkapto-silika (HMS), abu sekam padi (ASP)

Two Highly Stable Silver Nanoparticles: Surface Plasmon Resonance Spectra Study of Silver Nanoparticles Capped with m-Hydroxybenzoic Acid and p-Hydroxybenzoic Acid Gusrizal Gusrizal; Sri Juari Santosa; Eko Sri Kunarti; Bambang Rusdiarso
Molekul Vol 13, No 1 (2018)
Publisher : Universitas Jenderal Soedirman

Silver nanoparticles capped with m-hydroxybenzoic acid and p-hydroxybenzoic have been successfully synthesized, but the long-term stability data of these silver nanoparticles are not available. In this paper, we report the stability of these two types of silver nanoparticles for a period of 40 weeks observation based on the change of surface plasmon resonance spectra of silver nanoparticles. Silver nanoparticles were synthesized by reduction of silver nitrate with m-hydroxybenzoic acid and p-hydroxybenzoic acid without addition of capping agent. The presence of silver nanoparticles was indicated by the appearance of yellow color due to the surface plasmon resonance of silver nanoparticles. The resulted silver nanoparticles were stored at room temperature and further UV-visible spectrophotometer was used to follow the change in surface plasmon resonance spectra. The surface plasmon resonance spectra of silver nanoparticles were overlapped for the first 18 weeks, followed by little change in the position of absorption maxima (lmax), peak intensity, and width of the absorption peak until the week of 40. Silver nanoparticles capped with m-hydroxybenzoic acid and silver nanoparticles capped with p-hydroxybenzoic acid were highly stable which should make them suitable for further applications. The results show the potential of m-hydroxybenzoic acid and p-hydroxybenzoic acid to become a new reducing agent in the synthesis of highly stable silver nanoparticles. The m-hydroxybenzoic acid and p-hydroxybenzoic acid appeared to act as both reducing and capping agent.

Material Hibrida Mg/Al-HT Terinterkalasi Asam 3,4,5-Trihidroksibenzoat Dengan Metode Kopresipitasi Melalui Mikro Reaktor-T Danar Danar; Sri Juari Santosa; Eko Sri Kunarti
JC-T (Journal Cis-Trans): Jurnal Kimia dan Terapannya Vol 5, No 1 (2021)
Publisher : State University of Malang or Universitas Negeri Malang (UM)

Telah berhasil disintesis Mg/Al hidrotalsit (Mg/Al-HT-ATBH) terinterkalasi asam 3,4,5-trihidroksibenzoat (ATHB) dengan metode kopresipitasi langsung melalui mikro reaktor-T. Material hibrida dikarakterisasi dengan XRD dan FT-IR. Hasil penelitian menunjukkan bahwa sintesis Mg/Al-HT-ATBH berlangsung optimum pada pH 8 dengan perbandingan mol ATHB: Mg2+ : Al3+ sebesar 0,5 : 2 : 1. Karakterisasi menggunakan FT-IR dan XRD menunjukkan bahwa ATBH terinterkalasi di dalam daerah antar lapis Mg/Al-HT menggantikan anion NO3-. Hal ini menyebabkan terjadinya pergeseran basal spacing d003 dari 11,27° menjadi 6,74° dan jarak antar lapis meningkat dari 7,84 menjadi 13,10 Å.

Pengaruh Pemanasan Terhadap Kemampuan Tanah Diatomit sebagai Adsorben Logam Krom (III) dan Kadmium (II) Nuryono Nuryono; Eko Sri Kunarti; Narsito Narsito
Jurnal Kimia Sains dan Aplikasi Vol 3, No 2 (2000): Volume 3 Issue 2 Year 2000
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Telah dilakukan penelitian untuk mengkaji pengaruh pemanasan terhadap kemampuan tanah diatomit Sangiran, Sragen, Jawa Tengah terhadap kemampuannya mengadsorbsi logam Cr(III) dan Cd(II) dalam larutan. Sebelum proses adsorpsi dilakukan tanah diatomit dikarakterisasi keberadaan situs aktifnya dengan menggunakan spektrofotometri infra merah (IR) dan analisis termogravimetri (TGA). Adsorpsi dilakukan melalui sistem bath dengan mencampurkan sejumlah sampel tanah dengan larutan logam pada temperatur kamar, 30°C, pH 4,0- 6,0 (tanpa pengaturan) untuk Cr(lll), dan 5.0 - 7,0 untuk Cd(II). Proses serupa dilakukan terhadap tanah diatomit yang telah dipanaskan pada temperatur yang berbeda (300°C, 500°C dan 900°C). Pengaruh lama kontak dan konsentrasi awal logam terhadap adsorpsi dievaluasi untuk menentukan kapasitas, tetapan adsorpsi, dan energi adorpsi. Hasil penelitian menunjukkan bahwa tanah diatomit melepaskan semua molekul air pada pemanasan 580°C, dan kondensasi gugus silanol menjadi siloksan terjadi pada pemanasan 700°C. Pemanasan tanah diatomit sampai 500°C dapat meningkatkan kemampuan mengadsorpsi ion Cr(III), sedangkan untuk adsorpsi ion Cd(ll) tidak berubah secara signifikan. Sebaliknya, pemanasan sampai 900°C mengakibatkan penurunan yang tajam terhadap kemampuannya mengadsorpsi baik ion Cr(III) maupun Cd(II). Kapasitas adsorpsi tertinggi untuk Cr(III), 205,3 mg/g, terjadi pada tanah setelah pemanasan 500°C, sedangkan untuk Cd(II), 14.93 mg/g, terjadi pada tanah setelah pemanasan 300°C. Tetapan adsorpsi berkisar 6.93 - 11,51 x 103 untuk Cd(II) dan 0,94- 1,58 x 103 untuk Cr(III), sedangkan energi adsorpsi berkisar 17,30- 18,55 kJ/mol untuk Cr(III) dan 21,49- 23,56 kJ/mol untuk Cd(ll).

Silver-and-Sulphur-Codoped Fe3O4/TiO2 as a Magnetically Separable Photocatalyst for Methylene Blue Degradation under Visible Light Kunarti, Eko Sri; Agustiningsih, Dewi; Pambudi, Fajar Inggit; Rusli, Stefen; Rusdiarso, Bambang
Molekul Vol 19 No 1 (2024)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jm.2024.19.1.9508

This research aimed to investigate how the addition of silver and sulphur dopants modified the TiO2 photocatalyst to enhance its responsiveness to visible light and improve its photocatalytic activity for methylene blue degradation. In addition, Fe3O4 was also added as a core to add magnetic properties to the photocatalyst material. The Fe3O4/TiO2-Ag/S materials were prepared using FeCl3.6H2O and FeSO4.7H2O as the magnetite precursors, titanium tetraisopropoxide (TTIP) as the TiO2 precursor, while AgNO3 and CH4N2S were used as the sources for silver and sulphur dopants, respectively. The synthesized materials were next characterized using FT-IR, XRD, UV-Vis spectrophotometer, SEM-EDX, TEM, and VSM. The activity of the photocatalyst was then assessed through methylene blue degradation in a closed reactor involving various contained Ag:S ratios and reusability examination. The evaluation of photocatalytic degradation results was performed using UV-Vis spectrophotometry. Afterwards, the research findings indicate that the Fe3O4/TiO2-Ag/S was successfully synthesized and exhibited magnetic properties with a saturation magnetization value of 5.33 emu/g. The highest photocatalytic activity (98.21%) was observed in Fe3O4/TiO2-Ag/S (1:1) with a band gap energy value of 2.64 eV under visible light exposure at pH 10, 120 min, 10 mg mass of the photocatalyst, and methylene blue concentration of 5 mgL-1. Furthermore, the Fe3O4/TiO2-Ag/S photocatalyst was known to perform good stability through four reuse cycles.

Recovery of Gold in Au/Cu/Mg System from SH/Fe3O4@SiO2 as a Magnetically Separable and Reusable Adsorbent Qomariyah, Ani; Nuryono, Nuryono; Kunarti, Eko Sri
Indonesian Journal of Chemical Research Vol 9 No 1 (2021): Edition for May 2021
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2021.9-ani

The recovery of Au(III) in the Au/Cu/Mg system from mercapto-silica hybrid coated magnetite (SH/Fe3O4@SiO2) adsorbent has been investigated. This adsorbent characterized using FT-IR to determine functional groups, crystallinity study using XRD, surface morphology using SEM, material compositions with XPS, surface area using nitrogen adsorption, and TGA to study thermal stability. Adsorption of metal ions carried out with batch system for 30 minutes at a pH of 3. In the Au/Cu/Mg multi-metal system, Au(III) ions were easily desorbed (approximately 85%) by SH/Fe3O4@SiO2 adsorbent based on HSAB (Hard Soft Acid Base) theory that Au(III) ion is a softer metal than Cu(II) and Mg(II) where Au(III)>Cu(II)>Mg(II). The recovery of Au(III) ions was easily desorbed using thiourea 7% in 0,1 M HCl solution with the percentage of 79%. The process of SH/Fe3O4@SiO2 adsorbent separation after adsorption and recovery was very easy. The adsorbent could perfectly separate in 5 minutes using an external magnet. The SH/Fe3O4@SiO2 adsorbent can be reused on the adsorption-desorption process of Au(III) in the Au/Cu/Mg system approximately four times of cycle reactions.

Immobilization of Ni(II) on Amine-Functionalized Mesoporous Silica as Catalyst for Benzyl Alcohol Acetylation Reaction Nabilah, Wardah; Kunarti, Eko Sri; Pambudi, Fajar Inggit
Makara Journal of Science Vol. 28, No. 3
Publisher : UI Scholars Hub

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

In this study, amine-functionalized and Ni(II)-immobilized mesoporous silica materials were synthesized. This research aimed to synthesize mesoporous silica based on rice husk ash functionalized with amine and immobilized with Ni(II). The activity of amine-functionalized and Ni(II)-immobilized mesoporous silica materials was studied for the acetylation of benzyl alcohol with acetic anhydride as the acetylating agent. First, mesoporous silica was synthesized using rice husk ash using the sol–gel method, followed by amine functionalization using (3-aminopropyl)triethoxysilane (APTES) and Ni(II) immobilization through ultrasonic treatment. The results obtained showed that amine-functionalized and Ni(II)-immobilized mesoporous silica (SiO2/APTES/Ni(II)) were successfully synthesized, confirmed by Fourier transform infrared and Energy-dispersive X-ray spectrometry data. In addition, the synthesized materials had an average pore diameter of 12.83 nm. Afterward, the catalytic activity test showed that SiO2/APTES/Ni(II) was able to convert 98.34% of benzyl alcohol in the acetylation reaction at 45 °C for 5 h. The use of the SiO2/APTES/Ni(II) catalyst for three cycles obtained percent conversion values with a slight decreases (98.34%, 95.20%, and 90.61%).

Co-Authors - Jumaeri Agusti, Nabila Nur Akhmad Syoufian Aziz, Saifuddin Bambang Rusdiarso Bambang Rusdiarso Buhani Buhani Danar Danar Dewi Agustiningsih, Dewi Dwi Rasy Mujiyanti Endang Tri Wahyuni Feri Eka Hermawan, Feri Eka Fitri Khoerunnisa Gusrizal Gusrizal Holyness Nurdin Singadimedja Indi Annisa Hapsari Indriana Kartini Mauludi, Kurniawan Mustofa Ahda Mustofa Ahda Nabilah, Wardah Narsito Narsito Narsito Narsito Narsito Narsito Nuryono Nuryono Nuryono Nuryono Nuryono Nuryono Pambudi, Fajar Inggit Qomariyah, Ani Ramanda, Yudha Robby Noor Cahyono Rusli, Stefen Sampe Baralangi, Sampe Siti Sulastri Sri Juari Santosa Sri Juari Santosa Sutarno Sutarno Sutarno, Sutarno Suyanta Suyanta Thomas, Kevin Triatmaja, Karisma Widiakongko, Priyagung Dhemi

Title

Found 24 Documents
Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title Search

Found 24 Documents Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title

Found 24 Documents
Search