scholarly journals PENGARUH KONSENTRASI NaOH DAN WAKTU PENAHANAN TERHADAP KARAKTERISTIK ZEOLIT YANG DISINTESIS DARI LIMBAH GEOTHERMAL

REAKTOR ◽  
2017 ◽  
Vol 17 (1) ◽  
pp. 17
Author(s):  
Sulardjaka Sulardjaka ◽  
Deni Fajar Fitriana
Keyword(s):  
Crystal Size ◽  
Holding Time ◽  
Zeolite A ◽  
Zeolite Structure ◽  
Silica Source ◽  
Zeolite P

Abstract THE EFFECT OF CONCENTRATION OF NaOH AND HOLDING TIME ON CHARACTERISTIC OF ZEOLIT SINTHESIZED FROM GEOTHERMAL WASTE. Objective of this research is to investigate the effect of concentration of NaOH and holding time on the characteristic of synthesized zeolite from geothermal waste. Geothermal waste was used as silica source and hydrothermally processed for zeolite synthesized. Variation concentration of NaOH was 1.67, 3, and 5 M and variation of holding time are 1, 3, and 5 hours. Synthesized products were characterized by XRD, FTIR and SEM photomicrograph. It can be concluded that the rise of concentration of NaOH reduce the cristalization time and crystal size. Increasing of concentration of NaOH and holding time produce divers zeolite structure. At holding time 5 h and NaOH 1.67 M produces zeolite A. At holding time 5 h and NaOH concentration 3 M produce zeolite P. Sodalite is produced at concentration NaOH 5 M with holding time 5 h. Keywords: hydrothermal; geothermal waste; zeolite   Abstrak Penelitian ini bertujuan untuk meneliti pengaruh konsntrasi NaOH dan waktu penahanan terhadap karakteristik zeolit yang disintesis dari limbah geothermal. Limbah geothermal dipilih sebagai bahan silika pada sintesis zeolit dengan metode hidrothermal. Penelitian dilakukan dengan variasi konsentrasi NaOH: 1,67, 3, dan 5 M, dan variasi waktu penahanan 1, 3 dan 5 jam. Produk hasil sintesis dikarakterisasi dengan XRD, FTIR dan foto SEM. Hasil dari penelitian ini menunjukkan bahwa  tinggi konsentrasi NaOH kristalisasi zeolit A semakin cepat, sehingga ukuran kristal semakin kecil. Konsentrasi NaOH yang semakin tinggi dan waktu penahanan yang semakin lama, menghasilkan  jenis struktur zeolit yang lebih beragam. Pada waktu penahanan 5 jam, variasi konsentrasi NaOH 1,67 M menghasilkan zeolit A, variasi konsentrasi NaOH 3M menghasilkan zeolit P (NaP1) dan pada variasi konsentrasi NaOH 5M menghasilkan sodalit. Kata kunci: hydrothermal; limbah geothermal; zeolit

scholarly journals Synthesis of Zeolite-A and Zeolite-Y Using Silica Gel Waste as Silica Source and Modifying with Fe

2018 ◽  
Vol 7 (4.38) ◽  
pp. 1376
Author(s):  
Pornnipa Khaosomboon ◽  
Kulyakorn Khuanmar ◽  
Panomchai Weerayutsil
Keyword(s):  
Surface Area ◽  
Silica Gel ◽  
Zeolite Y ◽  
Physical Adsorption ◽  
Lower Surface ◽  
Zeolite A ◽  
Silica Source ◽  
Bet Specific Surface Area ◽  
Silica Gel Waste ◽  
Modified Zeolites

The purpose of this research was to synthesize zeolite-A (Ze-A) and zeolite-Y (Ze-Y) using silica sources from silica gel waste, and also improving adsorption capacity with Fe which was trapped in the synthesized zeolites:  Ze-Fe-A and Ze-Fe-Y. All synthesized zeolites were tested with lead solution of 40 mg/L at pH 5. For BET specific surface area, the parent Ze-A and Ze-Y presented surface area of 27.02 and 211.42 m2/g, respectively, whereas Ze-Fe-A and Ze-Fe-Y presented a lower surface area of 10.90 and 28.22 m2/g, respectively. SEM and TEM image demonstrated the cubic and polygon shapes for Ze-A and Ze-Y, respectively, while their modification with Fe presented more round shape. Additionally, both modified zeolites with Fe presented higher adsorption efficiency than their parents. Although the modified zeolites gave lower surface area, the efficiency removal of lead showed higher capacity than zeolite without Fe. It could be concluded that the adsorption mechanism of modified zeolites did not only rely on physical adsorption, but also on chemical adsorption.      

Bayberry-like ZnO/MFI zeolite as high performance methanol-to-aromatics catalyst

2016 ◽  
Vol 52 (10) ◽  
pp. 2011-2014 ◽  
Author(s):  
Ning Wang ◽  
Weizhong Qian ◽  
Kui Shen ◽  
Chang Su ◽  
Fei Wei
Keyword(s):  
High Performance ◽  
Catalytic Efficiency ◽  
Mfi Zeolite ◽  
Zeolite Structure ◽  
Zeolite P ◽  
Two Sides

A unique bayberry-shaped MFI zeolite structure with a zeolite shell (1–1.5 μm in thickness) and numerous zeolite nanowires (500–800 nm in length) vertically grown on two sides of the shell is prepared. The catalytic efficiency is significantly higher than that of the conventional ZnO/MFI zeolite.

Transient crystallization and crystal size distribution of zeolite A

1993 ◽  
Vol 48 (21) ◽  
pp. 3683-3691 ◽  
Author(s):  
Wen H. Chen ◽  
Hsing C. Hu ◽  
Ting Y. Lee
Keyword(s):  
Size Distribution ◽  
Crystal Size ◽  
Crystal Size Distribution ◽  
Zeolite A

Kinetic study of the transformation of zeolite A into zeolite P

Zeolites ◽  
1982 ◽  
Vol 2 (2) ◽  
pp. 135-142 ◽  
Author(s):  
Boris Subotić ◽  
Ivan Šmit ◽  
Olga Madžija ◽  
Lavoslav Sekovanić
Keyword(s):  
Kinetic Study ◽  
Zeolite A ◽  
Zeolite P

The use of zeolites for the treatment of radioactive waste

1985 ◽  
Vol 49 (351) ◽  
pp. 203-210 ◽  
Author(s):  
A. Dyer ◽  
K. Y. Mikhail
Keyword(s):  
Heat Treatment ◽  
Radioactive Waste ◽  
Test Data ◽  
Synthetic Zeolite ◽  
Cement Composites ◽  
Zeolite A ◽  
Mild Heat ◽  
Zeolite Structure ◽  
Leach Test ◽  
Leaching Experiments

AbstractThe uptake of 137-Cs and 90-Sr on to synthetic zeolite A has been studied. The use of a combined barium exchange followed by a relatively mild heat treatment has been shown to fix the isotopes within a collapsed zeolite structure. Leaching experiments using deionized and simulated sea and pond waters were carried out on zeolite compacts and zeolite/cement composites. They demonstrated the effectiveness of the calcination and cement containment. Some comments on the interpretation of leach test data are made.

Control of Crystal Size and Distribution of Zeolite A

2001 ◽  
Vol 40 (4) ◽  
pp. 1133-1139 ◽  
Author(s):  
Tejinder Brar ◽  
Paul France ◽  
Panagiotis G. Smirniotis
Keyword(s):  
Crystal Size ◽  
Zeolite A

Synthesis of Zeolite from Geothermal Waste

2014 ◽  
Vol 660 ◽  
pp. 157-161 ◽  
Author(s):  
Sulardjaka ◽  
Deni Fajar Fitriyana ◽  
Agus Purnomo Adi
Keyword(s):  
Amorphous Silica ◽  
Hydrothermal Reaction ◽  
Hydrothermal Process ◽  
Holding Time ◽  
Zeolite Synthesis ◽  
Zeolite A ◽  
Alternative Source ◽  
Silicon Based

The high content of silica in geothermal waste can be used as a alternative source of amorphous silica for the production of silicon based materials. In this research, geothermal waste was used as silica sources in hydrothermal reaction of zeolite synthesis. Zeolite was synthesized by unstirred hydrothermal process. Hydrothermal process was conducted at variation temperature 100, 110 and 120 °C for 5 hours. To study the effect of holding time on hydrothermal product, hydrothermal process also done in variation of: 1, 3 and 5 hours holding time at temperature 120 °C. All of hydrothermal products were characterized by XRD. The results show hydrothermal process successfully converts geothermal waste into zeolite A and sodalite.

scholarly journals Optimization And Reactivity Study Of Silica In The Synthesis Of Zeolites From Rice Husk

1996 ◽  
pp. 27-35 ◽  
Author(s):  
Zainab Ramli ◽  
Endang Listiorini ◽  
Halimaton Hamdan
Keyword(s):  
Rice Husk ◽  
Zeolite Y ◽  
Extraction Procedure ◽  
Chemical Extraction ◽  
Complex Nature ◽  
Silicate Concentration ◽  
Silica Source ◽  
Reactivity Study ◽  
Zeolite P

Although the chemical extraction of silica from rice husk ash (RHA) is well established; its reactivity in the synthesis of zeolites have not been studied and optimized. Due to the complex nature of silica, the extraction procedure is important in ensuring production of highly reactive silica. This paper reports on the optimization of the extraction procedure and determination of the factors that influence impurities are the factors that influence the reactivity of silica. Pure amorphous silica was obtained with RHA:NaOH ratio of 1.5 and sodium silicate concentration (measured in specific gravity) of 1.2-1.5. Reactivity rests of the extracted silica via crystallization of zeolite Y in reaction mixtures of various basicity show that pure zeolite Y was formed from the sample containing 85% Si02 with neutral or slightly basic property. In contrast,crystallization in the presence of silica source that is acidic containing a low percentage of Si02 favours the formation of zeolite P.

Synthesis of Zeolite A Crystals in the Presence of Crystal Growth Inhibitors by Microwave-Assisted Hydrothermal Technique

2011 ◽  
Author(s):  
Mirza Aqeel Baig ◽  
Tahar Laoui ◽  
Farid Fadhillah ◽  
Oki Muraza ◽  
Zafarullah Khan
Keyword(s):  
Crystal Growth ◽  
Ethylene Glycol ◽  
Heating Rate ◽  
Crystal Size ◽  
Growth Inhibitors ◽  
Zeolite A ◽  
Poly Ethylene Glycol ◽  
Hydrothermal Technique ◽  
Microwave Assisted ◽  
Poly Ethylene

Zeolite A crystals were synthesized at 100°C from sodium metasilicate and aluminium foil by microwave assisted hydrothermal technique. It was confirmed by using X-ray diffraction technique that zeolite A was produced. The influence of heating rate on the zeolite crystal size was investigated using 2.5°C/min, 7.5°C/min, and 50°C/min. It was shown that the low heating rate resulted in larger crystal size with high crystallinity. To evaluate the effect of crystal growth inhibitors (GCIs) on the zeolite synthesis and crystal size, three types of CGIs, namely Poly Ethylene Glycol (PEG); Poly Ethylene Glycol-Methyl Ether (PEG-ME); and Brij-96, were utilized. It was found that PEG gave the best result in terms of zeolite size compared to the other two CGIs by resulting in reduction of the size of zeolite A crystals into about half compared to that without CGI.

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