Eddy Heraldy
Department of Chemistry, University of Sebelas Maret, Jl. Ir. Sutami 36A Kentingan Surakarta 57126

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STUDI PENDAHULUAN PEMANFAATAN LIMBAH DESALINASI UNTUK PEMBUATAN Mg/Al HYDROTALCITE-LIKE SEBAGAI ADSORBEN METHYL ORANGE Heraldy, Eddy; Prasasti, Dian; Wijaya, Karna; Santosa, Sri Juari; Triyono, Triyono
Bumi Lestari Journal of Environment Vol 12, No 1
Publisher : Udayana University

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

Abstract

The utilization of industrial wastewater into a versatile material that has been the focus of research for economics reasons, environmental and technical. One of the proposed industrial wastewater for a new useful material is wastewater from the desalination process which is also known as brine water. The magnesium content in brine water is able to used as a source of magnesium for the synthesis of Mg/Al hydrotalcite-like compound (Mg/Al HTlc). Mg/Al HTlc are widely investigated for their potential applications in research and industrial processes as adsorbents, catalysts and /or catalyst precursors and pharmaceutical industry excipients. As adsorbents, Mg/Al HTlc are receiving greater interests in the environmental community due to their high adsorption capacity. However, before using natural brine water, has conducted a preliminary study the synthesis of Mg/Al HTlc by using artificial brine water as a model of desalination wastewater. The objective of this research is to synthesis of Mg/Al HTlc from artificial brine water and its ability tested as a methyl orange (MO) adsorbents. The research initiated with the synthesis of Mg/Al HTlc from artificial brine water. Characterization of the Mg/Al HTlc synthesized was confirmed through X-ray Diffraction and FT-IR Spectroscopy. The determination of optimum acidity, adsorption rate, and energy and capacity adsorption were studied. The result showed that pH 3 was the optimum acidity for the adsorption of MO on Mg/Al HTlc. MO was adsorbed at first order adsorption rate of 7.30 × 10-4 s-1 on the Mg/Al HTlc, the adsorption capacity and adsorption energy were 4.36 × 10-5 mol g-1 and 27.54 kJ mol-1, respectively. From the preparatory process and the synthesis of Mg/Al HTlc by using artificial brine water to provide the information that the byproduct of desalination processes (brine water) which are believed to be used for the synthesis of Mg / Al HTlc.
KAJIAN OPTIMASI JUMLAH ADSORBEN DAN WAKTU KONTAK PADA RED 2B OLEH Mg/Al HYDROTALCITE LIKE Heraldy, Eddy; Maruto, Dian; Riasdianti, Irina C
Alchemy Jurnal Penelitian Kimia Vol 6, No 2 (2007)
Publisher : Alchemy Jurnal Penelitian Kimia

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Abstract

Telah dilakukan kajian optimasi jumlah adsorben dan waktu kontak pada adsorpsi larutan Red 2B oleh Mg/Al Hydrotalcite-like (Mg/Al-HTlc). Optimasi dilakukan dengan menggunakan Mg/Al-HTlc yang telah dibuat dengan nisbah mol awal antara Mg/Al masing-masing 2,5; 3,0 dan 3,5 pada pH 5,0. Hasil optimasi dari variasi jumlah adsorben adalah 0,025 gram, sedangkan dari variasi waktu kontak adalah 2 jam pada nisbah mol Mg/Al 2,5. Kalsinasi berpotensi meningkatkan kemampuan adsorpsi dan dalam penelitian ini.
ALUMINASI FELDSPAR PADA TANAH ABU VULKANIK (TAV) DENGAN LARUTAN ALUMINIUM KLORIDA HEKSAHIDRAT Heraldy, Eddy; Widjonarko, Dian Maruto; Saputro, Sigit Wiwiet
Alchemy Jurnal Penelitian Kimia Vol 3, No 2 (2004)
Publisher : Alchemy Jurnal Penelitian Kimia

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Abstract

Telah dilakukan aluminasi feldspar pada Tanah Abu Vulkanik (TAV) gunung Lawu dengan menggunakan larutan aluminium klorida heksahidrat 0,1 M. Aluminasi dilakukan pada suhu 30, 50, 70 dan 90oC masing-masing selama 6 jam. Perlakuan kalsinasi terhadap sampel sebelum dan sesudah aluminasi dilakukan selama 6 jam pada 550oC.Hasil penelitian menunjukkan bahwa proses aluminasi feldspar pada suhu 30, 50, 70 dan 90oC tidak cukup berpengaruh. Difraktogram menunjukkan bahwa struktur sampel pada suhu aluminasi 30oC dan 90oC masih tetap di pertahankan sebagai mineral feldspar dengan kristalinnitas yang semakin meningkat.
CALCINATION ON Ca-Mg-Al HYDROTALCITE FROM BRINE WATER AND ITS CHARACTERIZATION Heraldy, Eddy; Nugrahaningtyas, Khoirina Dwi; Heriyanto, Heriyanto
ALCHEMY Jurnal Penelitian Kimia Vol 13, No 2 (2017): Alchemy Jurnal Penelitian Kimia
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.13.2.5606.205-216

Abstract

The study of calcination at 450 ºC on Ca-Mg-Al-hydrotalcite synthesized from brine water has been investigated. Characterization by XRD shows that Ca-Mg-Al hydrotalcite compound has found hydrotalcite phase and another phase such as Mg(OH)2, Al(OH)3 and CaCO3. These results are confirmed by the presence of hydroxyl groups (-O-H), M-O and M-OH groups (M is Mg, Ca and Al) at wavenumber region around     3463,34 cm-1; 447,50 cm-1; 536,62 cm-1and 786,99 cm-1. The calcination on Ca-Mg-Al hydrotalcite at 450 ºC affected change in the structure become a metal oxide such as MgO, CaO, Al2O3, MgAl2O4, and CaCO3. These results are confirmed from decreasing on the absorption peak of M-OH group at wavenumbers around 536,62 cm-1and 786,99 cm-1 and widening of the absorption region at 447,5 - 857,4 cm-1. Consequently, the calcination treatment successfully increased the surface area of Ca-Mg-Al hydrotalcite compounds from 97.4 m2/g to 156.826 m2/g. Morphology of Ca-Mg-Al hydrotalcite underwent changes the shape from a big to be a small form. Thermal analysis results showed changes in the structure of Ca-Mg-Al hydrotalcite into oxides begin at a temperature of 210 ºC and become oxide completely after the temperature reaches 420 ºC.
CATALYTIC ACTIVITY CoMo/USY ON DEOXYGENATION REACTION OF 4-METHOXYPHENOL IN BATCH REACTOR Nugrahaningtyas, Khoirina Dwi; Putri, Irma Fadhila; Heraldy, Eddy
ALCHEMY Jurnal Penelitian Kimia Vol 13, No 1 (2017): Alchemy Jurnal Penelitian Kimia
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.13.1.2378.66-74

Abstract

This research was conducted to study the effect of catalyst type of CoMo/USY and the reaction time on the deoxygenation reaction of 4-methoxyphenol. The catalyst type used were CoMo/USY, Co-Mo/USY, and Mo-Co/USY. The product was analyzed by gas chromatography (GC) and gas chromatography-mass spectrometry (GC-MS). The activity of the Co-Mo/USY catalyst is higher than CoMo/USY and Mo-Co/USY, it can be seen from the value of total yield and the selectivity. The Co-Mo/USY catalysts shows a significant increasing on the total yield percentage (from 3.71 % to 9.41 %) during catalytic testing. The Co-Mo/USY catalyst has a highest selectivity toward 1,4-dimethoxybenzene product when the reaction time was one hour (0.92 %) and selectivity toward 1,4-dihidroxybenzene when reaction time two hours (0.43 %).
SYNTHESIS AND CHARACTERIZATION OF CERAMIC METAL Ni-YSZ PREPARED FROM LOCAL ZIRCON SAND AT VARIOUS Ni:YSZ COMPOSITION Apriany, Karima; Rahmawati, Fitria; Heraldy, Eddy; Syarif, Dani G; Soepriyanto, Syoni
ALCHEMY Jurnal Penelitian Kimia Vol 13, No 2 (2017): Alchemy Jurnal Penelitian Kimia
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.13.2.2384.217-229

Abstract

This research synthesized a cermet Ni-YSZ, in which the YSZ (yttria stabilized-zirconia) was synthesized from the local zircon sand, ZrSiO4, as a side product of tin mining plant in Bangka island, Indonesia. The synthesized YSZ in this research is zirconia, ZrO2 doped by 8 % mol of yttrium dioxide. The synthesis used solid state reaction method and the result was characterized its crystal structure and its cell parameters by XRD analysis equipped with Le Bail refinement, surface morphology analysis, and an impedance analysis to understand its ionic conductivity. The cermet Ni-YSZ was synthesized at a various composition of Ni:YSZ i.e., 20:80, 30:70, and 40:60 (b/b). The analysis shows that Ni-YSZ is in two phases of Ni and YSZ without any presence of a third phase. It indicates that there was no solid state reaction between Ni and YSZ during synthesis. In this Ni-YSZ cermet, the Ni phase in a cubic structure, and the YSZ is also in a cubic structure. Morphological study shows that the addition of Ni to YSZ allows the morphology to become more roughness with larger grain size. This research found that the Ni-YSZ 20:80 has highest ionic conductivity.
Desulfurisasi Katalitik Tiofen Menggunakan Katalis CoMo/USY dalam Reaktor Batch Nugrahaningtyas, Khoirina Dwi; Pratiwi, Nanda; Heraldy, Eddy
ALCHEMY Jurnal Penelitian Kimia Vol 14, No 1 (2018): Alchemy Jurnal Penelitian Kimia
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.14.1.2368.119-130

Abstract

Telah dilakukan uji aktivitas katalis CoMo/USY pada reaksi desulfurisasi tiofen. Reaksi dilakukan pada reaktor sistem batch dengan tekanan gas N2 sebesar 1 bar gas N2 dan waktu reaksi selama 1 jam. Penelitian ini bertujuan untuk mengetahui pengaruh variasi temperatur dan variasi karakter katalis pada reaksi desulfurisasi tiofen. Product desulfurisasi dianalisis dengan Gas Chromatography - Mass Spectra (GC-MS). Karakter kestabilan struktur katalis dilihat dengan analisis menggunakan instrumen Fourier Transform Infrared Spectroscopy (FT-IR). Hasil analisis terhadap uji aktivitas desulfurisasi menunjukkan bahwa pada rentang temperatur 200-300°C, rendemen bertambah dengan meningkatnya temperatur. Pada penelitian telah berhasil menghidrogenasi tiofen, tetapi belum bisa menghilangkan kandungan sulfurnya. Adapun efek karakter katalis terhadap aktivitas katalitiknya menunjukkan bahwa karakter katalis yang paling dominan adalah sifat keasaman. Katalis dengan keasaman tertinggi, yaitu katalis CoMo/USY, memiliki aktivitas tertinggi dengan rendemen produk sebesar 2,88%. Hasil analisis FT-IR terhadap katalis bekas menunjukkan bahwa struktur cukup stabil dan tidak ada pengotor yang terikat pada katalis.Catalytic Desulfurization of Thiophene using CoMo/USY Catalyst in Batch Reactor. CoMo/USY catalyst activity has been tested for thiophene desulfurization reaction. The reaction was carried out in batch system reactor with N2 gas pressure of 1 bar and reaction time for 1 hour. This study aims to determine the effect of temperature variation and catalyst character variation in thiophene desulfurization reaction. The desulfurization products were analyzed by Gas Chromatography - Mass Spectra (GC-MS). The characters of structure catalyst were analyzed by Fourier Transform Infrared Spectroscopy (FT-IR). The results of the analysis of the desulfurization activity test showed that in the temperature range 200-300 °C, the yield raised with increasing temperature. The analysis results of the desulfurization activity test showed that in the temperature range of 200-300°C, the yield raised with increasing temperature. The study has successfully hydrogenated thiophene, but has not been able to eliminate the sulfur content. The effect of the catalysts character on its catalytic activity shows that the most dominant character of the catalysts was its acidity. The highest acidity catalyst, CoMo/USY catalyst, has highest activity with the product yield of 2,88%. The result of the FTIR analysis on the used catalyst show that the structure was stable and no impurities were attached the catalyst.
AN EMPIRICAL STUDY ON THE HYDROGEN PEROXIDE REACTION WITH IODIDE IN ACID CONDITION Rosalia, Ayuni Dita; Patiha, Patiha; Heraldy, Eddy
ALCHEMY Jurnal Penelitian Kimia Vol 11, No 1 (2015): Alchemy jurnal penelitian kimia
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.11.1.109.72-80

Abstract

This research aimed to find out I- reaction order in the mechanism of  hydrogen peroxide reaction with iodide in acid condition, to find out the form of rate law, and to show the role of H+ in reaction. The experiment for determining reaction order was carried out with isolation method using UV-Vis spectrophotometry. The order reaction was obtained from the r value approaching one, the results of its linear regression. The form of rate law was viewed from the presence or absence of oxygen gas. Meanwhile the role of H+ in reaction was determined by observing the pH value in 60 minutes.The result of experiment shows that the mechanism of reaction has rate law in the form of fraction, in which I- could be in zero and first orders. In addition, the rate law in this experimental condition is not an addition in the absence of O2 and relatively equal kobs value in the same order. The role of H+ is observed not as catalyst, but reactant.
Anionic and Cationic Dyes Removal from Aqueous Solutions by Adsorption onto Synthetic Mg/Al Hydrotalcite-Like Compound Heraldy, Eddy; Santosa, Sri Juari; Triyono, Triyono; Wijaya, Karna
Indonesian Journal of Chemistry Vol 15, No 3 (2015)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (524.184 KB) | DOI: 10.22146/ijc.21190

Abstract

The current investigation reports an effective adsorption of both anionic species and cationic dyes on Mg/Al hydrotalcite-like compounds (Mg/Al HTlc) synthetic from brine water, as novel, inexpensive available alternative to the commercial hydrotalcite. The feasibility of the Mg/Al HTlc, for the adsorptive removal of both anionic (Eosin Yellow-EY and Methyl Orange-MO) and cationic (Methylene blue-MB) dyes from aqueous solution was evaluated in a batch process. Dyes adsorption process was thoroughly studied from both kinetic and equilibrium points of view for all adsorbents. The adsorption kinetics was tested for the pseudo-first order and pseudo-second order kinetic models at different experimental conditions. The dyes adsorption follows the pseudo-second order kinetics model, with correlation coefficients close to unity when experimental data were fitted in the model. The experimental isotherm data were analyzed using Langmuir and Freundlich isotherms. The results from Langmuir isotherm indicated that the capacity of Mg/Al HTlc for the adsorption of anionic dyes was higher than that for cationic dyes.
CHARACTERIZATION AND ACTIVATION OF NATURAL ZEOLIT FROM PONOROGO Heraldy, Eddy; SW, Hisyam; Sulistiyono, Sulistiyono
Indonesian Journal of Chemistry Vol 3, No 2 (2003)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (126.02 KB) | DOI: 10.22146/ijc.21891

Abstract

Characterization and activation of Natural Zeolite from Ponorogo (ZAP) have been done to improve the quality of zeolite as porous material. Analysis of mineral composition is done using X-Ray Difraction (XRD), Fourier Transform-Infra Red (FTIR) Spectroscopy and metal analysis using Atomic Absorption Spectroscopy (AAS). Characterization of the activated zeolite covered about number of acidic sites, surface area, ratio Si/Al and metal composition (Na, Ca, K and Fe). Activated processes is done using various mineral acid, i.e HCl, HNO3, H2SO4 and HPO4 with each concentration at 1 M and 3 3 hours dipping. The result showed that ZAP has composition Ca-klinoptilolit (43.09 %), gismondin (17.57 %), modernit (4.21 %) and quartz (10.37 %). The most efectif of the acid to activate is HCl and is proved to absorp of Zn in waste water. The effect of chemical activation is increasing the ratio of Si/Al, increasing the surface area and reducing some metal composition.   Keywords: natural zeolite, chemical activation, porous material