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STUDY ON THE EXISTING OF METAL ELEMENTS NI, PB, CR AND CD IN THE ZEOLITIZATION PRODUCTS OF FLY ASH WITH NAOH SOLUTION Wibowo, Widajanti; Hermiati, Teti
Jurnal Zeolit Indonesia Vol 4, No 2 (2005)
Publisher : Jurnal Zeolit Indonesia

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Directly reuse of fly ash waste from electricity power plant as soil conditioner is often not recommended, because of its content on heavy metals elements. This research studied the existence of metal elements, Ni, Pb, Cr and Cd in the zeolitization products of fly ash produced in PLTU Suralaya. Zeolitization process was conducted hydrothermal using NaOH solutions of 3N and 4N at temperature of 90oC and 120oC and heating time of 12 hours, 24 hours and 48 hours. 10 kinds of zeolite products were identified as a mixture of zeolite Na-PI, Na6(Si10Al6O32).12H2O and zeolite Na Hydroxysodalite, Na6(SiAlO4)6.4H2O, which had cation-exchange capacity much higher than the original fly ash. Metals ions content of Ni, Pb, Cr and Cd in the zeolite products, analyzed by AAS, were found much decrease compared to its content in the fly ash. Further study on leaching of metals ions from the zeolite products with water on pH neutral did not show a significant losses of these metals ions.

APLIKASI REAKSI KATALISIS HETEROGEN UNTUK PEMBUATAN VANILI SINTETIK (3-HIDROKSI-2-METOKSIBENZALDEHIDA) DARI EUGENOL (4-ALLIL-2-METOKSIFENOL) MINYAK CENGKEH Wibowo, Widajanti; Suwarso, Wahyudi Priyono; Utari, Triesye; Purwaningsih, Henny
Makara Journal of Science Vol. 6, No. 3
Publisher : UI Scholars Hub

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APLIKASI REAKSI KATALISIS HETEROGEN UNTUK PEMBUATAN VANILI SINTETIK (3-HIDROKSI-2-METOKSIBENZALDEHIDA) DARI EUGENOL (4-ALLIL-2-METOKSIFENOL) MINYAK CENGKEH Wibowo, Widajanti; Suwarso, Wahyudi Priyono; Utari, Triesye; Purwaningsih, Henny
Makara Journal of Science Vol. 6, No. 3
Publisher : UI Scholars Hub

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ANION EXCHANGE CAPACITY OF CHROMATE ON MODIFIED ZEOLITE CLINOPTILOLITE WITH HDTMA-Br AND ITS REGENERATION Wibowo, Widajanti; Utari, Tresye; Yunarti, Rika Tri
Makara Journal of Science Vol. 15, No. 1
Publisher : UI Scholars Hub

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Zeolite Clinoptilolite from Lampung, located in South of Sumatra, had been modified with surfactant hexadecyltrimethylammonium bromide (HDTMA-Br) as chromate anion exchanger. Surfactant modified zeolite (SMZ) Clinoptilolite in particle size range of 1.5 - 2.0 mm, which contained 196.7 mmol HDTMA-Br/kg zeolite, was used for anion exchange of chromate at neutral pH. This experiment was conducted in a glass column filled with 5 gram SMZ. The breakthrough chromate exchange capacity was found 1.262 mg/g SMZ, while the total capacity was found 2.107 mg/g SMZ. The regeneration of SMZ saturated with chromate was conducted using a mixed solutions of 0.28 M Na2CO3 and 0.5 M NaOH, compared with using a solution of 0.01 M Na2S2O4. The desorption of chromate achieved 92% with the mixed solutions of Na2CO3 and NaOH and 90% with the Na2S2O4 solution. The regenerated SMZ with Na2CO3-NaOH solutions was prior washed with HCl solution to remove the carbonate from SMZ, before being used for chromate sorption again. Its breakthrough capacity was reduced to 1.074 mg/g SMZ, and to 0.724 mg/g SMZ when regenerated with Na2S2O4 solution. These results indicated that regeneration of SMZ affected its exchange capacity for anion chromate. However, it is still could be acceptable, when Na2CO3/NaOH solutions were used for the regeneration of SMZ saturated with anion chromate.

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