Category: Volume 2, No. 2 , 2015

The Use of Activated Natural Zeolite as an Adsorbent on Removing of Rhodamine B from Aqueous Solution

Pius Dore Ola, Ardinal G. Djami, and Hermania Em Wogo

Department of Chemistry, Faculty of Sciences and Engineering, Nusa Cendana University, Kupang

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Characterization of adsorbent prepared from HCl and NaCl-activated natural zeolite and its function  to remove rhodamin B from aqueous solution was conducted in present study. This research involved activation of natural zeolite, determination of zeolites surface area using methylene blue and adsorption of rhodamin B from water that was consisted of evaluation the effect of various contact time and concentration of activator (HCl and NaCl) to the amount of rhodamin B adsorbed. Analysis of methylene blue and rhodamin B solution were performed by using spectrophotometer UV-VIS. Results showed that surface area of the natural zeolite activated by HCl and NaCl were 26.90 and 26.72 m2/g, respectively. Optimum of contact time occurred at 30 to 40 minutes and was suitable with zero order reaction. Optimum adsorption concentration was 0.3 mg/L with the amount of rhodamin B adsorbed were 0.0049 (0.5 M HCl) and 0.0042 mg/g (3.0 M NaCl), respectively. At the same concentration, the ability of the natural zeolite activated by HCl was higher relatively than activated by NaCl. At the higher concentration of HCl, its ability as adsorbent decreases, oppositely, at the higher concentration of NaCl its ability as adsorbent increases.


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The Characteristics of Synthetic Chitosan Prepared from Snail Shells of Achatina fulica

Suwari, Jacob A. Frans,  and Luther Kadang
Department of Chemistry, Faculty of Sciences and Engineering, Nusa Cendana University, Kupang

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The Acid-Activated Sand Potentially Ameliorates Water Calcium Content

Hermania Em Wogo,  Yoseph J. Hema, and Suwari
Department of Chemistry, Faculty of Sciences and Engineering, Nusa Cendana University, Kupang

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The Antioxidant Activities of the Methanol Extracts of Dischidia nummularia

Yohanes Buang, Yakoba Tari, Theo Da Cunha, and Theodore Y. Lulan
Department of Chemistry, Faculty of Sciences and Engineering, Nusa Cendana University, Kupang

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The Green Algae Extracts Activated by Calcium Are Potential Biomass as Heavy Metal Absorbent

                                                      Suwari, Yoksen I. Nitbani, and Yohanes Buang                                                      

Department of Chemistry, Faculty of Sciences and Engineering, Nusa Cendana University, Kupang

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The capabilities of calcium-activated green algae biomass to absorpt toxic metals existed in aquatic environments were studied. The heavy/toxic metal used in this study was cadmium ion (Cd2+).The study was firstly prepared the green algae biomass powders and followed with acidity of their surfaces with sulfuric acids. The NaOH, KOH, and Ca(OH)2 were used to activate the biomass and yielded bioserbents namely Na-biosorbent, K-biosorbent, and Ca-biosorbent, respectively. Those yielded biosorbents were used and interacted with Cd2+ solution to recognize their sorption capacities and efficiencies. The results showed that the highest sorption of the Cd2+ ion among those biosorbents was provided by the Ca-biosorbent, in which their sorption efficiences were 78.84, 78.70, and 79.06%, respectively, whereas the sorption efficiency of biosorbent without addition of those three metal ions was 67.14%. The Ca-biosorbent was further characterized to recognize the optimum pH and contact time within the Cd2+ ions and provided the results that were at pH 5 and 60 min, respectively. The highest sorption efficiency provided by the Ca-sorbent conclusively indicated that the green algae extracts activated by calcium  are potential biomass as the biosorbent of heavy metals.


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