Yateman Arryanto

• Professor (Associate) at Universitas Gadjah Mada

This research aims to determine the effect of alkaline activation on the zeolite binding properties toward dissolved irons. Natural zeolite was activated by reflux using NaOH with various concentrations (2 N, 4 N, and 6 N). Furthermore, the activated zeolite was mixed into a solution of FeSO4.7H2O 0.5 M. Zeolite-Fe then characterised using FTIR, XR...

Preparation of an Fe(III) slow-release materials using chitosan and zeolite and evaluation of their release behavior in the 0.33 M citric acid has been done. The composite synthesis was carried out by varying the method of mixing basic ingredients. The first method was done by mixing chitosan gel, zeolite and Fe solution altogether (composite A)...

This study examines the ability of allophane as an adsorbent and photocatalytic capability of nanocomposite bismuth oxyiodide (BiOI)-allophane in removal of methylene blue dye. Adsorption was performed by using 50 mg of allophane from volcanic soil of mount Gamalama. The adsorption results showed that the optimum contact time is 10 min with adsorpt...

Vertically aligned nanorods ZnO have been deposited hydrothermally on the pre-coated ZnO seeded-glass substrates. Enhanced vertical alignment is achieved as a result of combined film post-treatments. Dipped-drawn and immersed-washing the as-synthesized ZnO films in water as well as quenching of the hydrothermal were proposed to hinder excessive dep...

Effect of allophane from Gamalama volcanic soil to the properties of BiOI-Allophane had been studied in this work. Composite of BiOIallophane from Gamalama volcanic soil has the potential to be applied as a photocatalyst or photofuel under visible light radiation. Increasing the amount of allophane increase the surface area of 30.122 to 63.240 m2 g...

Extraction of allophane particles from Gamalama volcanic soil have been performed and characterized by using FTIR, XRD, SEM-EDX and TEM. Gamalama volcanic soil sample was dried in air for 5 days and crushed into 200 mesh particle size. The sample is then treated with 10 % H2O2 and dispered at pH 10 by addition of 2 M NaOH. Colloid layer about 10 cm...

Alginate is an organic polymer that is isolated from brown algae and bacteria, while the zeolite is an aluminosilicate mineral sample. The purpose of this study was to synthesize composite alginate / zeolite / Fe, characterize composite alginate / zeolite / Fe, and assessing the release properties of Fe (III) of the composite alginate / zeolite / F...

Mesoporous carbons were synthesized from fructose using activators of zinc silicate (ZS), zinc borate (ZB), and zinc borosilicate (ZBS). The synthesis involves 3 steps, including caramelization of sugar, carbonization of caramel, and washing of carbon to separate the activator from the carbon. The solid products were characterized by N2 gas adsorpt...

Mesoporous carbon was prepared from fructose using zinc borosilicate(ZBS) activator. The synthesis involves caramelization and carbonization processes. The effect of both process temperature toward porosity and functional group of carbon surface are investigated in this research. The caramelization was conducted hydrothermally at 85 and 100 °C, fol...

Structural properties, including pore structure, functional group of carbon surface, and crystal structure of carbon built by zinc borosilicate (ZBS) and ZnCl 2 (Z) have been investigated in this work. Physically, ZBS and ZnCl 2 may act as template of carbon, whereas the Zn(II) cation act as chemical activator of carbonization. All precursors of ZB...

Synthesis of surfactant modified kaolin from natural kaolin from Tatakan, Tapin, South Kalimantan and its application for carrier material of gibberellic acid have been conducted. The kaolin modification was done by surface engineering using cationic surfactant cetyltrimethylammonium bromide (C16TMABr). The characterizations of kaolin and surfactan...

Preparation, activation and adsorption study of natural kaolin from Tatakan, Tapin, South Kalimantan have been conducted. The activation of kaolin was done using 6 M HCl solutions at 90 °C for 3 h. The characterizations of kaolin were carried out by Fourier Transform Infrared, X-ray diffraction, and surface area analyzer. Adsorption parameters stud...

Preparation of cement-zeolite-clay composite plate and its adsorption-desorption study with respect to ethanol/water mixture has been carried out. The composite plate was characterized by infrared spectrophotometer (IR) and X-ray diffraction (XRD). Material testing machine was used to determine the compressive strength of the composite plates. From...

Faujasite was hydrothermally synthesized from fly ash at 100oC in alkaline solution by reflux with 5M HCl and fusion with NaOH pretreatments. Phase transformation in the formation of faujasite was performed by variation of NaOH/fly ash weight ratios and hydrothermal times. The solid products were characterized by X-ray diffraction method. Results s...

Faujasite was hydrothermally synthesized from fly ash at 100oC in alkaline solution by reflux with various concentration of HCl and fusion with NaOH (weight ratio of NaOH/fly ash = 1.2) pretreatments. Thermal stability of faujasite from fly ash was tested at 400-900oC and was compared with commercial zeolite Y. The solid products were characterized...

The synthesis of MCM-41 from fly ash was done hydrothermally at 100°C for 72 hours using supernatant of fly ash solution, sodium silicate, tetramethylammonium hydroxide (TMAOH) and cetyltrimethyl-ammonium hydroxide (CTMAOH) surfactants. The effect of Si/Al mole ratio of precursor solution on the structural properties of MCM-41 was studied by variat...

Adsorption of gibberellic acid (GA3) onto raw and purified kaolin from Tatakan, South Kalimantan was investigated in this study. Purification process was done by sedimentation to obtain relative pure kaolinite. Raw and purified kaolin samples were characterized by Fourier transformed infrared (FTIR) spectroscopy and X-ray diffractometer (XRD). The...

ABSTRAK Hidrolisis lempung telah dilakukan dengan mereaksikan lempung dengan larutan asam klorida (HCl) yang disertai dengan pengadukan selama 24 jam. Hidrolisis dilakukan dalam beberapa variasi konsentrasi larutan HCl yaitu 6, 7, 8, 9, dan 10 M pada suhu ruang. Lempung terhidrolisis dikarakterisasi menggunakan Spektrofotometer Serapan Atom, Spektr...

Sensitization of TiO 2 films by Indonesian natural "Batik" dyes for DSSC (Dye Sensitized Solar Cell) has been studied. The natural dyes were extracted in ethanol from the fruits of joho (Terminalia bellirica (gaertn) roxb), the barks of tingi (Ceriops tagal) and tegeran (Maclura cochinensis) and adsorbed onto TiO 2 films for 20 hours. TiO 2 films o...

Encapsulation of the iron oxide nanoparticles in the zeolite cages by ion exchange method which is accompanied by characterization and examination of the photocatalytic activity for phenol photodegradation are reported. The largest Fe exchanged and the lowest zeolite structural damaged can be obtained when the ion exchange was carried out at pH 7....

Two procedures are proposed for the determination of the residual plyacrylamides in potable waters which have been previously claraified by treatment with polyacrylamides. The procedures are based on the precipitation of trace amounts of the polyacrylamides with reineckate ions and assay of the polyacrylamides via determination of the chromium cont...

The determination of trace amounts of non-ionic, cationic and anionic polyacrylamides in waters has been critically investigated. The polyacrylamides are reacted with hypochlorite from either sodium hypochlorite or Chloramine T to produce amines, which are then reacted with fluorescamine to give intensely fluorescent compounds. There are good linea...