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All Journal Sinergi Journal of Mathematical and Fundamental Sciences Indonesian Journal of Chemistry Akta Kimia Indonesia

Djoko Hartanto

Jurusan Kimia, Fakultas Matematika Dan Ilmu Pengetahuan Alam, Institut Teknologi Sepuluh Nopember (ITS) Jl. Arief Rahman Hakim, Surabaya 60111 Indonesia

Author-ID : 3421657

Astronomy Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Mathematics Physics

Published : 5 Documents Claim Missing Document

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Articles

Phase Transformation of Rice Husk Ash in the Synthesis of ZSM-5 without Organic Template Didik Prasetyoko; Neneng Ayunanda; Hamzah Fansuri; Djoko Hartanto; Zainab Ramli
Journal of Mathematical and Fundamental Sciences Vol. 44 No. 3 (2012)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.sci.2012.44.3.5

Phase transformation of rice husk ash in the synthesis of ZSM-5 without organic template at various crystallization times has been studied. Zeolite has been synthesized using the hydrothermal method at 175 °C with molar ratio 10Na2O : 100SiO2 : 2Al2O3 : 1800H2O with addition of silicalite-1 as seed. Solids were characterized using X-ray diffraction (XRD), infrared (IR) spectroscopy and scanning electron microscopy (SEM) techniques. Analysis of the results of XRD and IR spectroscopy indicated that ZSM-5 crystalstarted to form at 12 h of crystallization time, reaching high crystallinity after 24 h. With a crystallization time of more than 48 h, the ZSM-5 crystals had completely transformed into more stable quartz phase. Results indicated that phase transformation has occurred, in which an amorphous phase of rice husk ash has been transformed to ZSM-5 crystal phase during the early crystallization stage and continued to transform to disordered Î±-cristobalite phase and lastly quartz phases. SEM showed that the morphology of the ZSM-5 crystal was of an irregular hexagonal shape with particle size distribution around 3-7 Î¼m.

Pengaruh Perbandingan Pelarut Etanol dan Dimetilformamida pada Sintesis Metal Organik Framework HKUST-1 Ratna Ediati; Mary Kahardian; Djoko Hartanto
Akta Kimia Indonesia Vol 1, No 1 (2016)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember

Material Metal Organic Framework tipe HKUST-1 dengan rumus molekul [Cu3(BTC)2(H2O)3].xH2O telah disintesis menggunakan prekursor tembaga nitrat trihidrat dan asam 1,3,5 benzenetrikarboksilat melalui metode solvotermal dalam autoklaf dengan variasi volume pelarut etanol dan dimetilformamida pada suhu 100 oC selama 10 jam. Setelah padatan hasil reaksi disaring dan dicuci dengan metanol, diperoleh kristal Cu-BTC berbentuk serbuk berwarna biru cerah. Kristal Cu-BTC dikarakterisasi menggunakan teknik difraksi sinar-X, FT-IR, SEM, Energi Dispersi Sinar-X (EDS) dan TGA. Semua kristal yang didapat memiliki derajat kristalinitas yang tinggi dan menunjukkan kristal berbentuk oktahedral. Cu-BTC yang dihasilkan stabil dengan pemanasan hingga suhu ~350 oC. Keberadaan DMF menyebabkan ukuran kristal Cu-BTC lebih besar sedangkan Pengurangan volume pelarut DMF menyebabkan penurunan massa kristal yang terbentuk dan kurang homogen

CHARACTERIZATION AND COBALT DISTRIBUTION STUDY OF CERAMIC BODY SYSTEM : BOJONEGORO CLAY– FELDSPAR – QUARTZ Rohmat Sulistya; Djoko Hartanto; Irmina Kris Murwani
Indonesian Journal of Chemistry Vol 6, No 2 (2006)
Publisher : Universitas Gadjah Mada

The quality improvement of Bojonegoro Clay and the cobalt distribution on the surface of ceramic body system have been studied. The ceramic body system consists of Bojonegoro Clay, feldspar and quartz is optimized using a triaxial blend method. About 6 compositions among 15 compositions of synthesized ceramic bodies can be casted in plastic condition with plastic limit between 22 and 30%. It has been obtained that the optimum composition of the ceramic body is 57% clay, 14.5% feldspar, 28.5% quartz with the total shrinkage is 7 % and the modulus of rupture is 18.23 N/mm2. Cobalt is distributed homogenously on the optimum ceramic surface with 0.3 mm depth at optimum glaze firing temperature (1050 oC).

Adsorption Study of Rhodamine B and Methylene Blue Dyes with ZSM-5 Directly Synthesized from Bangka Kaolin without Organic Template Ani Iryani; Hadi Nur; Mardi Santoso; Djoko Hartanto
Indonesian Journal of Chemistry Vol 20, No 1 (2020)
Publisher : Universitas Gadjah Mada

Rhodamine B (RB) and Methylene Blue (MB) dyes adsorption using adsorbent ZSM-5 synthesized from Bangka kaolin were investigated in this study. The effects of the initial concentration, contact time and temperature on the adsorption process were also analyzed. The effect of the initial concentration and contact time played an important role in the adsorption process; however, the effect differs significantly in both dyes. The temperature plays little role in the dye adsorption process. The results showed the adsorption process occurred in ZSM-5 adhere to Langmuir isothermal adsorption model showing that the adsorption process occurred to be monolayer. Based on the kinetics studies, the pseudo-first-order kinetic model represents the adsorption kinetics that occurs for both dyes onto the synthesized ZSM-5. Thermodynamic parameters namely Gibbs free energy (ΔG°), standard entropy changes (ΔS°) and standard enthalpy (ΔH°) reveal that the adsorption process onto ZSM-5 for both dyes was spontaneous and exothermic.

Induced roll magnetic separator applied for high grade ilmenite separation from mining tailing Wiwik Dahani; Rita Sundari; Subandrio Somali; Irfan Marwanza; Andriyani Andriyani; Djoko Hartanto; Khuzaimah Arifin; Ratna Ediati
SINERGI Vol 27, No 2 (2023)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/sinergi.2023.2.015

This article aimed to separate ilmenite (FeTiO3) mineral from tin tailing applying a single splitter IRMS (Induced Roll Magnetic Separator). Ilmenite mineral is the substantial main source for TiO2. This work used air table middling for feeding. The mineral components of middling feeding from air table using grain counting analysis were found as follows: cassiterite (48.61%), ilmenite (21.36%), monazite (18.56%), pyrite (4.60%), zircon (5.85%), quartz (0.71%), anatase (0.27%), and tourmaline (0.02%), It was found that electrical current and opening of single splitter affected the degree of separation addressing to ilmenite recovery and ilmenite grade. The finding showed that current of 15 Ampere and single splitter with opening 4.25 cm yielded ilmenite recovery more than 74%. The high grade ilmenite (90.46 %) and recovery of 29.38% was obtained using 5 Ampere with single splitter opening of 1.0 cm. Up to date, the study on ilmenite separation from tailing only focused on the effect of current, however, the effect of single splitter magnetic separator to enhance ilmenite recovery from other paramagnetic minerals such as monazite, siderite, xenotime and tourmaline has not yet been reported.

Co-Authors Aishah Abdul Jalil Andriyani Andriyani Ani Iryani Che Ku Nor Liana Che Ku Hitam Cicik Herlina Yulianti Didik Prasetyoko Hadi Nur Hamzah Fansuri Irfan Marwanza Khuzaimah Arifin Kris Murwani, Irmina Mardi Santoso Mary Kahardian Neneng Ayunanda Ratna Ediati Rita Sundari Rohmat Sulistya Subandrio Tri Esti Purbaningtias Wiwik Dahani Yoshifumi Chisaki Zainab Ramli

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