Hens Saputra
Pusat Teknologi Industri Proses Gedung Teknologi 2 Lt.3 Kawasan PUSPIPTEK, Tangerang Selatan, Banten

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INOVASI PUPUK CONTROLLED RELEASE FERTILIZER (CRF) UNTUK TANAMAN BAWANG MERAH Rosjidi, Mochamad; Saputra, Hens; Wahyudi, Imam; Setyorini, Dyah; Widowati, Ladiyani
Majalah Ilmiah Pengkajian Industri Vol 12, No 3 (2018): MAJALAH ILMIAH PENGKAJIAN INDUSTRI
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/mipi.v12i3.2609

Abstract

Bawang merah merupakan salah satu komoditas pertanian yang menjadi perhatian pada saat ini untuk ditingkatkan produksinya dalam rangka mendukung program ketahanan pangan nasional. Upaya meningkatkan produksi pertanian membutuhkan dukungan pupuk yang sesuai dengan kaidah spesifikasi lokasi dan komoditas tanaman. Inovasi pupuk CRF yang dibuat dengan teknologi matrik dan biodegradable binder dapat meningkatkan panen sekitar 14% dibandingkan dengan penggunaan pupuk NPK biasa dan dapat menghemat pupuk hingga 50% serta cukup sekali pemupukan selama masa tanam. Pupuk CRF dapat mengendalikan pelepasan unsur nutrien dengan baik sesuai dengan hasil uji pelarutan dalam air. Zeolit alam yang digunakan merupakan campuran clinoptilolit dan mordenit. Bawang merah yang dihasilkan lebih baik dengan ukuran umbinya lebih besar dan warna merah cerah.
Zinc-Air Battery – Powering Electric Vehicles to Smart Active Labels Othman, Raihan; Saputra, Hens
International Conference on Engineering and Technology Development (ICETD) 2012: 1st ICETD 2012
Publisher : Bandar Lampung University (UBL)

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Abstract

This document gives formatting instructions for authors preparing papers for publication in the Proceedings of an UBL-ICETD conference. The authors must follow the instructions given in the document for the papers to be published. You can use this document as both an instruction set and as a template into which you can type your own text. The present paper reviews the development of zinc-air battery. Due to its high energy density advantage, the electrochemical system has been extensively studied and developed. However, major problems associated with the electrochemical system remain a formidable challenge, the utmost being to develop an electrically rechargeable zinc-air battery. Efforts made to overcome or mitigate the limitations concerned can be conceptually classified either as solving problems or seeking solutions. The changing paradigm from the electrically rechargeable system to the mechanically rechargeable system is illustrated as an example. Emerging innovations in smart active labels - flat, flexible and functional devices, particularly in healthcare industry, instigated the authors to develop zinc-air battery as a prospective micro-power source for smart active labels. The thin battery technology developed, in collaboration between IIUM and BPPT, is of low cost, comprises of green electroactive materials, and able to operate in quasi-neutral electrolyte. These features fulfil the criteria for the battery to be incorporated into disposable smart active labels.
Membran Reaktor untuk Pembuatan dan Pemurnian Isomer Xylene Wahyudin, Wahyudin; Saputra, Hens
VALENSI Vol 4, No 1 (2014): Jurnal Kimia Valensi Volume 4//No.1//Mei 2014
Publisher : Program Studi Kimia, Fakultas Sains dan Teknologi, UIN Syarif Hidayatullah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (71.575 KB)

Abstract

Abstrak Membran reaktor merupakan konsep perpaduan dari sistem reaksi dan proses pemisahan/pemurnian. Membran ini disebut juga sebagai membran katalis atau sistem katalis-membran. Dengan membran reaktor ini diharapkan konversi suatu reaksi dapat ditingkatkan dan diperoleh suatu produk yang memiliki tingkat kemurnian lebih tinggi. Sebagai katalis digunakan silica alumina yang berukuran 1,0 mm. Membran anorganik  zeolit MFI dilapiskan menutupi seluruh permukaan katalis. Bahan baku yang digunakan antara lain tetraethylortosilicate (TEOS) sebagai sumber silikat dan template organik tetraprophyl ammonium bromide (TPABr). Proses kristalisasi dilakukan pada temperatur 453 K di dalam autogeneous autoclave, dilanjutkan dengan kalsinasi pada temperatur 873 K selama 1 jam. Karakterisasi membran zeolit yang dihasilkan dilakukan dengan X-ray diffraction (XRD) dan pengamatan dengan Scanning Electron Mycroscope (SEM). Karakteristik pori dipelajari menggunakan metode physisorption dan BJH pore size distribution. Selain itu dilakukan pula uji selektifitas dan alkilasi toluena dan xylene. Berdasarkan pengamatan menggunakan XRD mengindikasikan adanya struktur zeolit MFI pada sampel membrane katalis yang dihasilkan. Diperkuat dengan obserbasi SEM menunjukkan bahwa membran zeolit MFI melapisi seluruh permukaan pelet silika alumina dan terdapat indikasi terjadinya komposit terhadap silika alumina pada daerah perbatasan antara membran zeolit atau lapisan bagian luar dengan katalis silika alumina. Hasil pengujian menunjukkan hasil bahwa membran reaktor zeolit MFI berpotensi untuk diaplikasikan sebagai membran katalis yang bersifat sangat selektif terhadap bentuk suatu molekul. Kata kunci: membran reaktor, isomer, xylene, zeolit, silika alumina, hidrotermal   Abstract Membrane fusion reactor is the concept of system reactions and separation processes of purification. These membranes are called also catalyst membrane or catalyst-membrane system. With the reactor membrane is expected conversion of a reaction can be increased and obtained a product having a higher purity. As the silica alumina catalyst used measuring 1.0 mm. MFI zeolite coated inorganic membranes covering the entire surface of the catalyst. The raw materials used include tetraethylortosilicate (TEOS) as the source of silicates and organic template tetrapropyl ammonium bromide (TPABr). Crystallization process carried out at a temperature of 453 K in the autogeneous autoclave, followed by calcination at a temperature of 873 K for 1 hour. Characterization of zeolite membranes produced performed by X-ray diffraction (XRD) and scanning electron observations with Mycroscope (SEM). Pore ​​characteristics were studied using physisorption method and BJH pore size distribution. In addition, the selectivity of the test is also conducted and alkylation of toluene and xylene. Based on observations using XRD indicates a structure of MFI zeolite membrane on the resulting catalyst samples. Reinforced with SEM showed that the MFI zeolite membrane coating the entire surface of the silica alumina pellets and there are indications of the silica alumina composites in the border area between zeolite membrane or outer coating with silica alumina catalyst. The results show that the results of MFI zeolite reactor  membrane has the potential to be applied as a catalyst membrane that is highly selective to form a molecule. Keywords : reactor membrane, isomers, xylene, zeolite, silica alumina, hydrothermal
Anoda Pb dan Gel Elektrolit Untuk Propulsi Kapal Selam Saputra, Hens; Rosjidi, Mochamad; Ghofar, Abdul; Tandirerung, Murbantan; Ismail, Mochammad; Islam Nurwantoro, Dorit Bayu
Majalah Ilmiah Pengkajian Industri Vol 11, No 2 (2017): Majalah Ilmiah Pengkajian Industri
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/mipi.v11i2.946

Abstract

Battery is the most important component in the sub marine energy system. Up to now, majority of the sub marine are still using lead acid battery as the power source or propulsion, due to more safe in application as very high capacity of single cell (i.e. 10.000 – 15.000 Ah). The drawbacks of aqueous based battery, which utilize liquid electrolyte, are because of having produced the hydrogen gas during charging process, in which it caused the electrolyte solution to become  dry and reduced the performance of battery. In addition that the hydrogen gas generated in the sub marine was dangerous. Therefore, the aim of  this research is how to reduce or eliminate of those drawbacks by modifying kind of the liquid electrolyte by using gel electrolyte. The gel electrolyte was synthesized to reduce the evaporation of electrolyte and to avoid the leaking when submarine maneuver.  The gel electrolyte  was made by using inorganic nanoporous MCM-41. It was synthesized by hydrothermal method, using Tetraethylortosilicate (TEOS) as silica sources, Cethyltrimethylammonium bromide (CTAB) as organic template and H2SO4 as catalyst. The MCM-41 lead acid battery gave a result of  OCV ca. 2,1 V.
PEMBUATAN DAN KARAKTERISASI KATALIS ZEOLIT ZSM-5 UNTUK KONVERSI BIOETANOL MENJADI BIOETILENA Nurdin, Ali; Saputra, Hens; Arfiana, Arfiana; Yunilawati, Retno; Finalis, Era Restu
Majalah Ilmiah Pengkajian Industri Vol 12, No 2 (2018): Majalah Ilmiah Pengkajian Industri
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/mipi.v12i2.2741

Abstract

Etilen sebagai produk petrokimia yang penting dapat dibuat dari bioetanol menggunakan katalis ZSM5. Zeolit sintetis ZSM5 dapat dibuat menggunakan zeolit alam yang banyak tersedia di Indonesia. Proses pembuatan ZSM5 menggunakan metode hidrotermal pada temperatur 180°C selama 24 jam. Sebagai agen pengarah terbentuknya struktur ZSM-5 tersebut digunakan template TPABr (Tetra Prophyl Ammonium Bromide). Kalsinasi produk ZSM5 dilakukan pada temperatur 600°C selama 1 jam. Karakterisasi ZSM-5 yang dilakukan antara lain analisis struktur dan kristalinitas, observasi morfologi permukaan menggunakan metode Difraksi Sinar X, Scanning Electron Microscopy, dan physisorption untuk mempelajari sifat pori. Hasil penelitian menunjukkan bahwa dihasilkannya ZSM-5 dengan kristalinitas sekitar 110 %. Kristal ZSM-5 yang dihasilkan berbentuk kubus dengan luas permukaan spesifik BET 300 m2/g, volume pori sekitar 0,13 Cm3/g. Distribusi ukuran pori yang sempit mengindikasikan ukuran pori yang seragam dengan ukuran rata-rata 0.55 nm.
Synthesis and Characterization of Zeolite Membrane Saputra, Hens; Rosjidi, Moch.
Jurnal Zeolit Indonesia Vol 3, No 2 (2004)
Publisher : Jurnal Zeolit Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (97.217 KB)

Abstract

The zeolite membrane of MFI could be sinthesized on alpha alumina support having an asymmetric structure and a pore diameter of top layer being about 0.1 μm. In this experiment, the method performed was a hydrothermal process being done at temperature 303 K by using Silica colloidal with the the composition of 30% SiO2, 0.04% Al2O3, 0.4% Na2O and NaOH 4N. The membranes produced were characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), X-ray diffraction (XRD), Energy Dispersive X-ray Spectrofotometer (EDX) and gas permeation, which use some pure gases such as carbon dioksida, methane, n-butane and ibutane. Based on the SEM observation, the top layer of MFI zeolite membrane produced was about 20 μm. The Analysis and mapping by using EDX showed that the zeolite membane was formed on top and inside of the support. Based on the gas permeation test, the permeance of nitrogen increased while the temperature encreased, and the result showed that the permeance ratio of n-butane/i-butane was about 60. Meanwhile, the selectivity of n-butane/i-butane at 300 K was 62. The simulation test of gas separation was performed by applying the mixture of nbutane and i-butane as a model and the temperature variation of 300 K, 340 K and 380 K. In this case, the Test used a pervaporation methode in which helium as inert gas (i.e. sweep gas) and on line analysis by using gas chromatography. The Flux of gas being through the membrane was measured by flow meter. The Selectivity of the mixture of n-butane and i-butane at temperature 300 K obtained was 62, and its selectivity decreased while the temperature increased.
Mesopori MCM-41 sebagai Adsorben: Kajian Kinetika dan Isotherm Adsorpsi Limbah Cair Tapioka Darmansyah, Darmansyah; Ginting, Simparmin; Ardiana, Lisa; Saputra, Hens
Jurnal Rekayasa Kimia & Lingkungan Vol 11, No 1 (2016): Jurnal Rekayasa Kimia & Lingkungan
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (381.384 KB) | DOI: 10.23955/rkl.v11i1.4228

Abstract

Telah dilakukan penelitian penggunaan material aluminasilikat MCM-41 sebagai adsorben limbah cair tapioka. Dalam penelitian ini dipelajari permodelan isotermal dan kinetika adsorpsi dari material MCM-41 pada proses adsorpsi limbah cair tapioka. Isotermal Langmuir dan Freundlich digunakan sebagai permodelan isotermal data penelitian. Dari data penelitian yang diperoleh pada konsentrasi COD sebesar 416 - 784 mg/L, proses adsorpsi limbah cair tapioka oleh MCM-41 sesuai dengan pendekatan isothermal Langmuir.  Kapasitas maksimum adsorpsi MCM-41 diperoleh dari pendekatan Langmuir adalah sebesar 15,92 mg/g. Model kinetika pseudo-orde pertama dan pseudo-orde kedua digunakan untuk analisis kinetika adsorpsi pada data penelitian. Model kinetik pseudo-orde pertama yang sesuai dengan proses adsorpsi limbah cair tapioka dengan laju penyerapan adalah 7,48 x 10-2 dan 7,37 x 10-2 g/(min-mg) untuk konsentrasi awal secara berturut-turut adalah 608 dan 784 mg/L.
Sintesis ZSM-5 dari Coal Fly Ash (CFA) dengan Sumber Silika Penambah yang Berasal dari Abu Sekam Padi: Pengaruh Rasio SiO2/Al2O3 Terhadap Kristalinitas Produk Metta, Azlia ; Ginting, Simparmin Br ; Saputra, Hens
Jurnal Rekayasa Proses Vol 8, No 2 (2014)
Publisher : Departemen Teknik Kimia Fakultas Teknik Universitas gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.11374

Abstract

Coal Fly Ash and rice husk ash can be utilized by converting it into ZSM-5 synthetic zeolite. One of the influencing factors of ZSM-5 synthetis is ratio of SiO2/Al2O3. Synthesis of ZSM-5 was carried out in an autoclave at a temperature of 180°C with a variation of the ratio of SiO2/Al2O3, namely 20, 30, 40, 50 and 60 mol/mol during 24 hour crystallization using TPABr template. Characterization of ZSM-5 was conducted using X-ray Diffraction, Scanning Electron Microscopy, Adsorption-Desorption Analysis of Nitrogen and Acidity. The results showed that the ZSM-5 was formed in all the variations of SiO2/Al2O3 ratios with the highest percent crystallinity of 52.83%, at the ratio of 50 mol/mol. All products are still in accompany with the formation of side products such as Analsime and Silica Oxide. The ZSM-5 crystal product was in hexagonal shape. Results from Adsorption-Desorption Analysis of Nitrogen indicated that all products were mesoporous materials. Keywords: crystallinity, mesopore, ZSM-5, silica, rice husk, SiO2/Al2O3 ratio Limbah Coal Fly Ash dan abu sekam padi dapat dimanfaatkan dengan mengkonversi limbah menjadi zeolit sintesis ZSM-5. Salah satu faktor yang mempengaruhi sintesis ZSM-5 adalah rasio SiO2/Al2O3. Sintesis ZSM-5 dilakukan di dalam autoklaf pada suhu 180C dengan variasi rasio SiO2/Al2O3 yaitu 20, 30, 40, 50 dan 60 mol/mol selama waktu kristalisasi 24 jam menggunakan template TPABr. Karakterisasi ZSM-5 menggunakan metode Difraksi Sinar X, Scanning Electron Microscopy, Adsorpsi – Desorpsi Nitrogen dan Analisis Keasaman. Hasil penelitian menunjukkan bahwa ZSM-5 terbentuk pada semua variasi SiO2/Al2O3. Persen kristalinitas produk ZSM-5 sebesar 52,83%, ada pada rasio 50 mol/mol. Semua produk masih disertai terbentuknya produk samping seperti Analsime dan Silika Oksida. Kristal ZSM-5 yang dihasilkan berbentuk heksagonal. Hasil Analisis Adsorpsi-Desorpsi nitorgen mengindikasikan bahwa semua sampel adalah material mesopori. Kata kunci: kristalinitas, mesopori, ZSM-5, sekam, rasio SiO2/Al2O3