Hamzah Fansuri
Department of Chemistry, Sepuluh Nopember Institute of Technology (ITS), Jl. Arief Rahman Hakim, Sukolilo, Surabaya 60111

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CRYSTALLINE PHASE REACTIVITY IN THE SYNTHESIS OF FLY ASH-BASED GEOPOLYMER Atmaja, Lukman; Fansuri, Hamzah; Maharani, Anggaria
Indonesian Journal of Chemistry Vol 11, No 1 (2011)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (710.099 KB) | DOI: 10.22146/ijc.21426

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Aluminosilicate, alkaline solution and fly ash from a power plant have been used to synthesize geopolymer at ambient temperature. SiO2/Al2O3 mole ratio of the starting materials was varied by the addition of pure, insoluble corundum and quartz. The geopolymer exhibited some differences in the ratio of initial reaction mixtures and that of final products. The corundum gave no influence to the compressive strength while the quartz at SiO2/Al2O3=4.0-6.0 produced significant change in the strength. The highest compressive strength achieved was 65 MPa. XRD using analysis Rietveld method proved that quartz has been found both in starting materials as well as in the geopolymer indicating the involvement of crystalline phases, to some extent, in geopolymerization process.
THE EFFECT OF PHOSPHORUS ADDITION ON THE ACTIVITY OF BISMUTH MOLYBDATE CATALYST FOR PARTIAL OXIDATION OF PROPYLENE TO ACROLEIN Fansuri, Hamzah; Pham, Gia Hung; Wibawanta, Sandra; Zhang, Dong-ke
Indonesian Journal of Chemistry Vol 10, No 3 (2010)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (187.41 KB) | DOI: 10.22146/ijc.21445

Abstract

In order to examine the effect of phosphorus addition on the activity and selectivity of bismuth molybdate catalysts for partial oxidation of propylene to acrolein, three modes of phosphorus addition were performed. The three modes of Preparation were performed by (1) adding phosphorus into a-Bi2Mo3O12 to obtain Bi2PxMo3Oy, (2) inserting phosphorus on bismuth sites to obtain Bi2-xPxMo3Oy, and (3) inserting phosphorus on molybdenum sites to obtain Bi2PxMo3-xOy. Four major phases of bismuth phosphomolybdate were detected as the result of the phosphorus addition, namely a-Bi2Mo3O12, Bi9PMo12O52, MoO3, and BiPO4. Experimental results showed that the catalysts solely containing BiPO4 and/or MoO3 have very low activities for partial oxidation of propylene to acrolein. Meanwhile, catalysts containing a-Bi2Mo3O12 and Bi9PMo12O52, together with either MoO3 or BiPO4 showed on average the same activities as a-Bi2Mo3O12 and one of them (combination of a-Bi2Mo3O12, Bi9PMo12O52 and MoO3) has better performance than a-Bi2Mo3O12 at lower temperatures. The presence of the oxygen donor phase, i.e. BiPO4 and MoO3, are believed to play a key role for the high activities of bismuth-phosphomolybdate catalysts. However, at higher temperatures, the presence of oxygen donor reduces the catalyst selectivity to acrolein.
UKURAN PARTIKEL DAN KONFORMASI KRISTAL ZEOLIT-A HASIL SINTESIS DENGAN PENAMBAHAN TETRAPROPILAMMONIUM HIDROKSIDA (TPAOH) Widiastuti, Nurul; Thalib, Farhanah; Prasetyoko, Didik; Fansuri, Hamzah
Reaktor Volume 15, No.2, OKTOBER 2014
Publisher : Dept. of Chemical Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (684.131 KB) | DOI: 10.14710/reaktor.15.2.132-138

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Abstract PARTICLE SIZE AND CRYSTAL CONFORMATION OF SYNTHESIZED ZEOLITE-A WITH TETRAPROPYLAMMONIUM HYDROXIDE (TPAOH) ADDITION. The aims of this research is to study the effect of tetrapropylammonium hydroxide (TPAOH) concentration in the synthesis of zeolite A to its physical characteristics such as crystallinity, crystal conformation and average crystal size. The zeolite A was synthesized with composition 3.165 Na2O : 1.000 Al2O3: 1.926 SiO2: 128 H2O : x TPAOH where x was 0; 0.0385; 0.0577; 0.0770; 0.1540 and 4.1602. The zeolite was crystalized under hydrothermal condition in a stainless steel autoclave at 100°C for 5 hours. The resulting crystal was washed with distilled water until pH 8 and then dried in an oven at 80oC for 24 hours. FT-IR and XRD analysis results show that the synthesized zeolite A at x = 4.1602 has the lowest crystallinity. It is estimated due to the mass of TPAOH was four times higger than the mass of zeolite framework components (Si and Al). SEM and PSD (Particle Size Distribution) analysis results show that TPAOH concentration affected the crystal conformation and the average size of zeolite A particles. The formation of chained crystal conformation was caused by the electrostatic interactions between TPA+ and negatively charge of zeolite framework. In addition, the particel size of the synthesized zeolite A at x = 0.1540 was 2.024 µm which was smaller than the particel size of the synthesized zeolite A without TPAOH, which was 3.534 µm.  Keywords: average size of particles; crystal conformation; TPAOH; zeolite A  Abstrak Penelitian ini bertujuan untuk mempelajari pengaruh konsentrasi TPAOH (Tetrapropilamonium hidroksida) dalam sintesis zeolit A terhadap sifat fisikanya yang meliputi kekristalan, konformasi kristal dan ukuran rata-rata kristal yang terbentuk. Pada penelitian   ini   zeolit A   disintesis    dengan komposisi 3,165 Na2O : 1 Al2O3 : 1,926 SiO2 :128 H2O: x TPAOH. Konsentrasi TPAOH divariasikan dengan nilai x adalah 0; 0,0385; 0,0577; 0,0770; 0,1540 dan 4,1602. Metode hidrotermal digunakan dalam penelitian ini dengan kondisi suhu  hidrotermal 100°C dan waktu kristalisasi selama 5 jam dengan pH pencucian 8. Hasil karakterisasi menggunakan FT-IR (Fourier Transform – Infrared Spectroscopy) dan XRD (X-Ray Diffraction)  menunjukkan bahwa zeolit A yang disintesis dengan x = 4,1602 memiliki kekristalan terendah. Hal ini diperkirakan terjadi karena masa TPAOH yang digunakan empat kali lebih besar daripada masa penyusun zeolit (Si dan Al). Berdasarkan hasil karakterisasi menggunakan SEM (Scanning Electron Microscopy) dan PSD (Particle Size Distribution), dapat diketahui bahwa TPAOH berpengaruh terhadap konformasi kristal dan rata-rata ukuran kristalnya.  Terbentuknya konformasi kristal seperti rantai disebabkan oleh adanya interaksi elektrostatik antara muatan positif pada TPA+ dan muatan negatif dari kerangka zeolit. Zeolit A yang disintesis dengan x = 0,1540 memiliki ukuran partikel rata-rata 2,024 µm yang lebih kecil dari daripada zeolit A tanpa TPAOH yaitu sebesar 3,534 µm. Kata kunci : ukuran partakel rata-rata; konformasi kristal; TPAOH; zeolite A  
INFLUENCES OF TIME AND RATIO OF Si/Al ON FORMATION ZEOLITE A FROM BOTTOM ASH CARBON FREE PLTU PT. IPMOMI WITH HYDROTHERMAL METHODS Syukuri Nikmah, R. A.; Widiastuti, Nurul; Fansuri, Hamzah
Jurnal Zeolit Indonesia Vol 7, No 1 (2008)
Publisher : Jurnal Zeolit Indonesia

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Abstract

This study aimed to utilize bottom-ash PLTU PT. IPMOMI, Probolinggo. Synthesis zeolite A conducted with directly method of hydrothermal. Initially, bottom-ash calcined at temperature of 800oC during 4 hours for eliminating residu of carbon from baking of coal, then it was dissolved with alkali NaOH, NaAlO2 and water deionization with comparison molar of 3.165 Na2O: Al2O3: 1.926 SiO2: 128 H2O. Crystallization of hydrothermal conducted by variation time (12-144 hours) and ratio molar of Si/Al (1; 1.2 and 1.4). The result XRD analysis showed that kinds form of zeolite is mixture of zeolite A, X, P and sodalite. The most form dominant of Zeolite with various variations condition hydrothermal is zeolite A with orthorombik structure which was formed at hydrothermal temperature of 160°C during 24 hours.
Pore Structure and Morphology Characterizations of Mesoporous ZSM-5 Synthesized at Various Aging Time Hartanto, Djoko; Purbaningtias, Tri Esti; Fansuri, Hamzah; Prasetyoko, Didik
Jurnal ILMU DASAR Vol 12 No 1 (2011)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

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Abstract

Mesoporous ZSM-5 has been successfully synthesized at various aging time of 6, 12 and 24 h. Mesoporous ZSM-5 was synthesized using cetyltrimethylammonium bromide (CTABr) as a template. Synthesis was carried out hydrothermally with aging and crystallization temperature at 60oC and 150oC. XRD patterns of the resulted material showed diffraction lines at 2θ = 23o and at small angle (2θ < 5o) which is characteristic of the structure of ZSM-5 and the existing of the mesoporous material. It was found that crystallinity of the sample increased at longer aging time. The result of nitrogen gas sorption analysis showed that all samples have pore size about 3,8 nm. The porosity of ZSM-5 decreased with shorter of aging time. ZSM-5 synthesized at 6 h aging time has the highest porosity of 72.57%. Aging time also affected the particle size, the longer the aging time, the smaller the particle size. The particle size was ranging 1.25 – 1.0 μm.
CATALYTIC PERFORMANCES OF Fe2O3/TS-1 CATALYST IN PHENOL HYDROXYLATION REACTION Prasetyoko, Didik; Royani, Cholifah Endah; Fansuri, Hamzah; Ramli, Zainab; Nur, Hadi
Indonesian Journal of Chemistry Vol 10, No 2 (2010)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (392.369 KB) | DOI: 10.22146/ijc.21452

Abstract

Hydroxylation reaction of phenol into diphenol, such as hydroquinone and catechol, has a great role in many industrial applications. Phenol hydroxylation reaction can be carried out using Titanium Silicalite-1 (TS-1) as catalyst and H2O2 as an oxidant. TS-1 catalyst shows high activity and selectivity for phenol hydroxylation reaction. However, its hydrophobic sites lead to slow H2O2 adsorption toward the active site of TS-1. Consequently, the reaction rate of phenol hydroxylation reaction is tends to be low. Addition of metal oxide Fe2O3 enhanced hydrophilicity of TS-1 catalyst. Liquid phase catalytic phenol hydroxylation using hydrogen peroxide as oxidant was carried out over iron (III) oxide-modified TS-1 catalyst (Fe2O3/TS-1), that were prepared by impregnation method using iron (III) nitrate as precursor and characterized by X-ray diffraction, infrared spectroscopy, nitrogen adsorption, pyridine adsorption, and hydrophilicity techniques. Catalysts 1Fe2O3/TS-1 showed maximum catalytic activity of hydroquinone product. In this research, the increase of hydroquinone formation rate is due to the higher hydrophilicity of Fe2O3/TS-1 catalysts compare to the parent catalyst, TS-1.   Keywords: Fe2O3/TS-1, hydrophilic site, phenol hydroxylation
SYNTHESIS AND MAGNETIC PROPERTIES OF BINUCLEAR COMPLEX [N(n-C4H9)4][MnIIFeIII(ox)3] Martak, Fahimah; Fansuri, Hamzah; Putri, Sekarayu Dianing
Indonesian Journal of Chemistry Vol 12, No 1 (2012)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (423.294 KB) | DOI: 10.22146/ijc.21377

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Binuclear complex, [N(n-C4H9)4][MnIIFeIII(ox)3] (ox=oxalate), has been synthesized and characterized. Binuclear complex with formula of [N(n-C4H9)4][MnIIFeIII(ox)3] was synthesized by forming precursor K3[Fe(ox)3] which was followed by adding manganese chloride and tetrabutyl ammonium chloride. Characterization of the complex was made by microanalysis, FT-IR spectroscopy, x-ray diffraction and Magnetic Susceptibility Balance. Magnetic moment of binuclear complex [N(n-C4H9)4][MnIIFeIII(ox)3] is 7.81 BM. The compound has higher magnetic moment than the previously reported compound with different organic cation, [N(n-C5H11)4][MnIIFeIII(ox)3]. This behavior might be associated with the decreasing range among layers on polymeric network.
Preparation of CaTiO3 Asymmetric Membranes Using Polyetherimide as Binder Polymer Setyaningsih, Endang Purwanti; Machfudzoh, Maya; Utomo, Wahyu Prasetyo; Fansuri, Hamzah
Indonesian Journal of Chemistry Vol 16, No 1 (2016)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (288.743 KB) | DOI: 10.22146/ijc.21172

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Asymmetric dense and thin membranes have been prepared from powders of perovskite oxide-type CaTiO3 without cracking by phase inversion method. Polyetherimide was used as a polymeric binder in the method. The resulting green membranes, composed of CaTiO3 powder and polyetherimide binder, were sintered at 890, 1100 or 1200 °C. The crystal phase of CaTiO3 was analyzed using X-Ray Diffraction (XRD). The XRD pattern of the synthesized CaTiO3 powder was matched with the reference indicating the formation of CaTiO3 structure. Sintering at 890 °C fails to form a strong membrane. Scanning Electron Microscope (SEM) images of the membranes showed that the membrane had the asymmetric structure with dense layer on one side and porous layer on the other side. The pores in the porous layer were both finger-like and sponge-like structure. The mechanical strength of the membranes, which were determined by Vickers micro hardness method, varied from 3.5 to 25.8 Hv. The strongest membrane without any crack was resulted from sintering at 1200°C with hardness values between 19.4 and 25.8 Hv. Thermal expansion coefficients of the asymmetric membranes sintered at 1100 and 1200 °C, measured with Thermomechanical Analyzer (TMA), were 10.82 × 10-6 and 12.78 × 10-6.C-1 respectively.
Kerapatan, Kekerasan dan Koefisien Muai Panas Membran Penghantar Ion Oksigen LaCo0,8Fe0,2O3-δ Tersubstitusi Ca2+(La1-xCaxCo0,8Fe0,2O3-δ) Fansuri, Hamzah; Trengginas, Totok; Zulaicha, Vivi; Utomo, Wahyu Prasetyo; Widiastuti, Nurul; Purwanti, Endang
Reaktor Volume 16 No. 2 Juni 2016
Publisher : Dept. of Chemical Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (704.768 KB) | DOI: 10.14710/reaktor.16.2.87-95

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Abstract DENSITY, HARDNESSAND THERMAL EXPANSION COEFFICIENTOF Ca2+-SUBSTITUTED LaCo0.8Fe0.2O3-δ (La1-xCaxCo0,8Fe0,2O3-δ) OXYGEN ION TRANSPORT MEMBRANE. A dense oxygen ion conductive membrane such as LaCo1-yFeyO3must be hard and has a low thermal expansion coefficient to survive harsh reaction condition in its application. Substitution of La3+ with Ca2+ is expected to improve both properties. Ca2+ substituted LaCo1-yFeyO3 powders were prepared from their respective metal oxides to become La1-xCaxCo0.8Fe0.2O3-δ (LCCF), where 0.1≤x≤0.4, using the solid state method. X-ray diffraction data indicates that the LCCFs are highly crystalized. The LCCF was then made into a membrane by pressing the powder in a stainless steel mold by applying 6 tonnes load for 10 minutes, followed by sintering the product at 1250°C. SEM analysis results showed that the densities of all LCCF membranes are very high. Average hardnesses of LCCF 9182, 8282, 7382 and 6482 membranes, as measured by the Vicker method,are 902.08, 915.42, 1093, and 1178.6 HV, respectively. Thermal expansion tests showed that LCCF 6482 is a membrane with the lowest thermal expansion coefficient. In addition, it is also evident that the higher the number of Ca2+substituents, the higher the hardness and the lower the thermal expansion coefficient. Substitution of La3+ by Ca2+ produced denser and harder membranes, as well as low thermal expansion coefficient, which are preferable when they are applied as oxygen ion conductive membranes. Keywords: dense membrane; La1-xCaxCo0.8Fe0,2O3-δ; oxigen ion transfer; perovskite  Abstrak Kekerasan tinggi dan koefisien muai panas rendah adalah sifat mekanik yang perlu dimiliki oleh membran rapat penghantar ion oksigen seperti oksida perovskit LaCo1-yFeyO3, agar dapat bertahan ketika digunakan. Substitusi La3+ oleh Ca2+ diperkirakan dapat memperbaiki kedua sifat tersebut. LaCo1-yFeyO3 tersubstitusi Ca2+disintesis dari oksida-oksida logamnya sehingga memiliki komposisi La1-xCaxCo0,8Fe0,2O3-δ (LCCF) dengan 0,1≤x≤0,4 dengan metode solid state melalui kalsinasi pada suhu 1000°C. Data difraksi sinar-X menunjukkan bahwa serbuk LCCF yang dihasilkan memiliki kekristalan yang tinggi. LCCF tersebut selanjutnya dibuat menjadi membran yang diawali oleh pencetakan melalui penekanan serbuk LCCF dengan beban 6 ton selama 10 menit di dalam cetakan  baja tahan karat dan dilanjutkan dengan sintering hasil pencetakan pada suhu 1250°C. Hasil pengamatan dengan SEM menunjukkan bahwa kerapatan semua membran LCCF yang dihasilkan sangat tinggi. Kekerasan rata-rata membran yang diukur dengan metode Vicker adalah 902,08;  915,42; 1093; dan 1178,6 HV masing-masing untuk LCCF 9182, 8282, 7382 dan 6482. Pengujian muai panas menunjukkan bahwa LCCF 6482 adalah membran dengan koefisien muai panas tekecil. Selain itu terlihat pula bahwa semakin tinggi jumlah substituen Ca2+, semakin tinggi pula kekerasannya dan semakin rendah koefisien muai panasnya. Substitusi La3+ oleh Ca2+ menghasilkan membran dengan kerapatan tinggi serta kekerasan dan koefisien muai panas yang lebih baik dalam aplikasi LCCF sebagai membran penghantar ion oksigen. Kata kunci: membran rapat; La1-xCaxCo0,8Fe0,2O3-δ; penghantar ion oksigen;  perovskit 
PENGARUH UKURAN PERUSAHAAN, PERTUMBUHAN PENJUALAN DAN PROFITABILITAS TERHADAP STRUKTUR MODAL PADA PERUSAHAAN TEKSTIL DAN GARMENT YANG LISTING DI BURSA EFEK INDONESIA Fansuri, Hamzah; Ibrahim, Mariaty
Jurnal Online Mahasiswa (JOM) Bidang Ilmu Sosial dan Ilmu Politik Vol. 5: Edisi I Januari - Juni 2018
Publisher : Fakultas Ilmu Sosial dan Ilmu Politik Universitas Riau

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This study aims to examine the persial and simultaneous influence of firm size, sales growth, and profitability of capital structure. Where independent variables in this study is the size of the company, sales growth, and profitability while the dependent variable is the capital structure. The sample used is secondary data derived from the financial statements of textile and garment companies listed on the Indonesia Stock Exchange (IDX) period 2009 to 2014. This study uses secondary data from the company's financial statements. Samples and sampling using purposive sampling technique. The classical assumption test in this research includes normality test, multicollinearity test, heterokedastisity test and autocorrelation test. Data analysis using multiple linear regression analysis, t test, F test, and test of coefficient of determination. Data analysis using multiple linear regression analysis with SPSS 20. The results of this study indicate that firm size variables persial (t test) affect the capital structure, while the variable sales growth and profitability does not affect the capital structure of textile and garment companies listed on the Indonesia Stock Exchange. The simultaneous test results (f) show the significant effect of firm size variable, sales growth, and profitability on capital structure in textile and garment companies listed in Indonesia Stock Exchange. Keywords : Company size, sales growth, profitability, and capital structure