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Strategi Sintesis Zeolit Hirarkis: Kajian Metode Cetak Lunak dan Cetak Keras Kadja, Grandprix T.M.; Rilyanti, Mita; Mukti, Rino Rahmata; Marsih, I Nyoman; Ismunandar, Ismunandar
Jurnal Matematika dan Sains Vol 18 No 3 (2013)
Publisher : Institut Teknologi Bandung

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Zeolit hirarkis saat ini diminati untuk digunakan sebagai katalis yang mampu menyelesaikan masalah pada industri petrokimia dan kimia. Masalah yang biasa ditemukan pada reaksi katalitik ini menyangkut kepada hambatan difusi molekul, deaktivasi katalis, rendahnya rendemen produk dan selektivitas produk. Hal ini dapat terselesaikan karena zeolit hirarkis memiliki pori tambahan yang berskala meso (>2 nm) selain keberadaan pori mikro (2 nm) despite the presence of micropore (

INDONESIA NATURAL MINERAL FOR HEAVY METAL ADSORPTION: A REVIEW Kadja, Grandprix T. M.; Ilmi, Moh Mualliful
Journal of Environmental Science and Sustainable Development Vol. 2, No. 2
Publisher : UI Scholars Hub

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Indonesia has abundant mineral resources used as natural adsorbent materials for the absorption of heavy metal. Among these are natural zeolites, clay, and ashes. These natural materials showed high performance adsorption capacity with respects to their low cost and high availability. Several research reports had been published for studying the performance of the natural materials as adsorbent of several heavy metals i.e., Hg, Pb, Fe, Cd, Cr, Zn, Ni, and Cu by examining the effect of various factors, including pH, contact time, initial concentration, temperature, and dosage. Furthermore, to determine the adsorption rate, mechanism, and efficiency of natural materials in the removal of toxic metals from aqueous solution, investigations have been made of the parameters of the adsorption isotherms, kinetics, and thermodynamics. The main objective of this article is to provide an overview of the use of some natural materials found in Indonesia, including clay, natural zeolite, fly ash, and bottom ash for use as adsorbents for several types of heavy metals in aqueous solution. These types of natural adsorbents were chosen as their high availability in natural or disposal product and their high performance regarding their heavy metal uptakes. This article review is important in order to capture the current research reported the use Indonesia natural minerals as adsorbent of heavy metals and providing its future research opportunities. Thus, we also emphasize the prospect materials and the future research opportunities for the use of Indonesia's local natural minerals with the utilization of non-conventional modification techniques that can provide added value and improve the performance of these natural materials in removing heavy-metal waste from aqueous solutions.

Geochemical Compositions and Magnetic Susceptibility of Soils from Different Origins: A Case Study in South Lampung, Indonesia Santoso, Nono Agus; Iqbal, Mochamad; Kadja, Grandprix Thomryes Marth
Indonesian Journal on Geoscience Vol 7, No 3 (2020)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.7.3.267-272

DOI:10.17014/ijog.7.3.267-272The study of rock weathering into soil is very important in geophysics. The geochemical and magnetic characteristics of soil were investigated in South Lampung using magnetic susceptibility and X-ray Fluorescence (XRF) measurements to identify the rock origin of the soil. The samples consisted of three soil types, those are granite soil, tuff soil in front of ITERA (Institut Teknologi Sumatra, South Lampung), and tuff soil inside ITERA. The tuffs (in front of and inside ITERA) and granite were taken in and around ITERA. The result showed that granite had the highest magnetic susceptibility value, while tuff soil in front of ITERA had the highest FeO content. Each sample can be distinguished by magnetic susceptibility and FeO content to prove that it can be used as a tool to distinguish the rock origin of soil.

Geochemical Compositions and Magnetic Susceptibility of Soils from Different Origins: A Case Study in South Lampung, Indonesia Santoso, Nono Agus; Iqbal, Mochamad; Kadja, Grandprix Thomryes Marth
Indonesian Journal on Geoscience Vol 7, No 3 (2020)
Publisher : Geological Agency

DOI:10.17014/ijog.7.3.267-272The study of rock weathering into soil is very important in geophysics. The geochemical and magnetic characteristics of soil were investigated in South Lampung using magnetic susceptibility and X-ray Fluorescence (XRF) measurements to identify the rock origin of the soil. The samples consisted of three soil types, those are granite soil, tuff soil in front of ITERA (Institut Teknologi Sumatra, South Lampung), and tuff soil inside ITERA. The tuffs (in front of and inside ITERA) and granite were taken in and around ITERA. The result showed that granite had the highest magnetic susceptibility value, while tuff soil in front of ITERA had the highest FeO content. Each sample can be distinguished by magnetic susceptibility and FeO content to prove that it can be used as a tool to distinguish the rock origin of soil.

Exceptional Aromatic Distribution in the Conversion of Palm-Oil to Biohydrocarbon Using Zeolite-Based Catalyst I Gusti B. N. Makertihartha; Grandprix Thomryes Mart Kadja; Melia L. Gunawan; Rino R. Mukti; Subagjo Subagjo
Journal of Engineering and Technological Sciences Vol. 52 No. 4 (2020)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2020.52.4.9

A series of four catalysts, i.e. ZSM-5 (Si/Al = 25) (Z1), a combination of ZSM-5 (Si/Al = 25) and zeolite Y (Si/Al = 25) (Z2), zeolite Y (Si/Al = 25) (Z3), and ZSM-5 (Si/Al = 80) (Z4), was successfully prepared for catalytic cracking of palm oil. All three catalysts utilized silica as a binder without other additional components. Catalytic cracking tests showed that the aromatic distribution was very high, according to the following order: Z4 (98%) > Z1 (90%) > Z2 (84%) > Z3 (60%). It was shown that ZSM-5 promotes the formation of aromatics better than zeolite Y does. From 98% of aromatics products in Z1, 71% were benzene, toluene, and xylene (BTX). It appears that the formation of aromatics needs milder acidity since a higher number of acids extends the cracking reaction, resulting in the formation of more gaseous and heavy aromatics products. The results of this study show potential for the sustainable production of bio-hydrocarbons with exceptional aromatic distributions, which may fulfill the demands of the petroleum, petrochemical, and fine chemical sectors.

Membrane Oxygenator for Extracorporeal Blood Oxygenation Enny Ratnaningsih; Putu T.P. Aryanti; Nurul F. Himma; Anita K. Wardani; K. Khoiruddin; Grandprix T.M. Kadja; Nicholaus Prasetya; I Gede Wenten
Journal of Engineering and Technological Sciences Vol. 53 No. 5 (2021)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2021.53.5.2

Extracorporeal blood oxygenation has become an alternative to supply O2 and remove CO2 from the bloodstream, especially when mechanical ventilation provides insufficient oxygenation. The use of a membrane oxygenator offers the advantage of lower airway pressure than a mechanical ventilator to deliver oxygen to the patient’s blood. However, research and development are still needed to find appropriate membrane materials, module configuration, and to optimize hydrodynamic conditions for achieving high efficient gas transfer and excellent biocompatibility of the membrane oxygenator. This review aims to provide a comprehensive description of the basic principle of the membrane oxygenator and its development. It also discusses the role and challenges in the use of membrane oxygenators for extracorporeal oxygenation on respiratory and cardiac failure patients.

Geochemical Compositions and Magnetic Susceptibility of Soils from Different Origins: A Case Study in South Lampung, Indonesia Nono Agus Santoso; Mochamad Iqbal; Grandprix Thomryes Marth Kadja
Indonesian Journal on Geoscience Vol 7, No 3 (2020)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.7.3.267-272

DOI:10.17014/ijog.7.3.267-272The study of rock weathering into soil is very important in geophysics. The geochemical and magnetic characteristics of soil were investigated in South Lampung using magnetic susceptibility and X-ray Fluorescence (XRF) measurements to identify the rock origin of the soil. The samples consisted of three soil types, those are granite soil, tuff soil in front of ITERA (Institut Teknologi Sumatra, South Lampung), and tuff soil inside ITERA. The tuffs (in front of and inside ITERA) and granite were taken in and around ITERA. The result showed that granite had the highest magnetic susceptibility value, while tuff soil in front of ITERA had the highest FeO content. Each sample can be distinguished by magnetic susceptibility and FeO content to prove that it can be used as a tool to distinguish the rock origin of soil.

The Surface-to-volume Ratio of the Synthesis Reactor Vessel Governing the Low Temperature Crystallization of ZSM-5 Ana Hidayati Mukaromah; Grandprix Thomryes Marth Kadja; Rino Rakhmata Mukti; Ignatius Redyte Pratama; Muhamad Ali Zulfikar; Buchari Buchari
Journal of Mathematical and Fundamental Sciences Vol. 48 No. 3 (2016)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.math.fund.sci.2016.48.3.5

Zeolite ZSM-5 is one of major catalysts in petroleum and fine-chemical industries. The synthesis of zeolite ZSM-5 is usually carried out at high temperature above 100 °C using the immense amount of organic structure-directing agents (OSDA). It is interesting to note that fine-tuning the initial gel mixture can be used to enhance the typical slow crystallization rate of ZSM-5. Herein, we report the effect of the surface-to-volume ratio of the reactor vessel to the crystallization of ZSM-5 at low temperature. The surface-to-volume ratio of the reactor vessel could influence the heat-transfer during the synthesis which further governed the crystallization of ZSM-5. It was found that the higher the surface-to-volume of the reactor, the more crystalline of the resulting products. The product with the highest crystallinity exhibited a nearly-spherical morphology composed of smaller ZSM-5 crystallites. This phenomenon allowed the presence of inter-crystallite mesopores which is an advantage for the catalytic reaction using bulky molecules.

Mini-Ulasan Adsorpsi Anthrasena, Fenanthrena dan Fluorena menggunakan Material Berbasis Karbon Berpori, Silika dan Zeolit Winda Br Purba; Grandprix Thomryes Marth Kadja; Muhammad Yudhistira Azis
Akta Kimia Indonesia Vol 6, No 2 (2021)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25493736.v6i2.9725

Senyawa Polisiklik Aromatik Hidrokarbon (PAH) merupakan salah satu senyawa polutan organik yang bersifat karsinogen, mutagen dan teratogen pada organisme, sehingga dapat bertahan dalam air untuk waktu yang lama. Antrasena, Fenantrena, dan Fluorena adalah jenis PAH yang banyak dihasilkan dari limbah industri. Penghilangan senyawa PAH dilakukan dengan metode adsorpsi sebagai metode paling efektif untuk pengolahan air yang tercemar karena biaya yang rendah, sederhana dan monitoring kandungan polutan. Pada penelitian ini telah dilakukan studi literatur terhadap adsorpsi PAH dengan berbagai adsorben bahan karbon berpori seperti Karbon Aktif, Biochar dan Graphene dan adsorben bahan mesoporus Silika seperti PMO, MCM-41, NH2-SBA-15, dan klinoptilolit (zeolite). Terdapat beberapa faktor yang mempengaruhi kemampuan adsorpsi dari Karbon aktif dan silika seperti luas permukaan spesifik, ukuran pori dan volume pori adsorben. Parameter adsorpsi PAH dengan karbon aktif dan silika yang diperoleh seperti pH dalam rentang 2-12, waktu kontak 1-24 jam, suhu 20-45°C, konsentrasi PAH 2-60 mg/L memberikan acuan rentang spesifik dalam mengevaluasi kinerja adsorpsi PAH dengan adsorben yang digunakan.

On the Mechanical and Thermal Properties of Poly(Vinyl Alcohol) – Alginate Composite Yarn Reinforced with Nanocellulose from Oil Palm Empty Fruit Bunches Ainul Maghfirah; Farah Fahma; Nurmalisa Lisdayana; Muchammad Yunus; Ahmad Kusumaatmaja; Grandprix Thomryes Marth Kadja
Indonesian Journal of Chemistry Vol 22, No 1 (2022)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.67881

PVA-alginate hydrogel is a promising material for use in biomedical applications due to its desirable characteristics: biocompatible, durable, non-toxic, and low cost. However, the low gel strength of this composite limits its use in biomedical applications. This study aims to develop enhanced mechanical and thermal properties of poly(vinyl alcohol) PVA-alginate composite yarn by adding nanocellulose isolated from the sustainable oil palm empty fruit bunches (OPEFBs). The PVA-alginate composite yarns reinforced with nanocellulose were prepared with various nanocellulose contents (1 wt.%, 2 wt.%, and 5 wt.%). The composite's tensile strength exhibited an increasing trend with the addition of nanocellulose, while the elongation at break showed the opposite trend. Moreover, it was demonstrated that the composite's thermal degradation shifts to higher temperatures with the addition of nanocellulose. The observed activation energies for the thermal degradation calculated using the Coats-Redfern method exhibited a significant increment for the composites reinforced with nanocellulose. These results show that the addition of nanocellulose into the PVA-alginate matrix enhances the chemical and thermal properties of the resulting hydrogel. All these improvements have resulted from more abundant and robust hydrogen bonds generated by the nanocellulose presence.

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