The chitosan from shell of crabs (Portunus sanginolentus L.) waste was produced from deproteinization, demineralization, depigmentation,and deacetylation steps. This process was obtained 22.66% chitosan which identified by FTIR spectrophotometry and had 65.47% degree ofdeacetylation. This chitosan was used to adsorb methylene blue dye which fit to the Langmuir isotherm with 0.0312 l mg -1 equilibriumconstant of adsorption (K) and 4.20 mg g -1 maximum capacity of adsorption (q m).
This study aims to obtain the optimum ratio of Ouw Natural Clay (LAO):Chitosan in the manufacture of chitosan-LAO composites. The composite will be used as an adsorbent for heavy metals Lead (Pb) and Cadmium (Cd). LAO-Chitosan composites were made with the ratio of LAO:Chitosan = 1.25:1, 2.5:1, 5:1. XRD and SEM were carried out for each composite. The performance as a Cd metal adsorbent was determined by calculating the adsorption capacity. Composites with a ratio of 1.25:1 have the best adsorption capacity. The performance as adsorbent for Cd metal was determined by calculating the absorbed Cd concentration. Maximum results are achieved by composites with a ratio of 5:1.
The adsorption of methylene blue dye by active carbon of hazelnut shell has been done. Through acquired active carbon composing process, where is the hazelnut shell at entry into furnace on temperature 350 for 2 hour, afterwards is cooled and at sieves by sieve 100 mesh. Then by the calsination process in furnace with temperature 450 one was streamed to gas N2 four 2 hours then characterized by X-ray diffraction (XRD) for carbon before activation. The next activated with KOH solution with a concentration 0f 50 four 5 hour, then dried in an ovenat 120℃ for 1 hour and thencharacterized. Weight of the solidacidity before and after activation consecutive (5.3848 x 10-3 dan 42.1554x 10-3) mol g-1. Isotherm adsorption of methylene blue dyes on active carbon was following the Freundlich isotherm. Adsorption kinetics of methylene blue dyes on active carbon in various concentration of hazelnut shell was controlled with temperature variety at 25 and 30 . The result showed that energy activation was kJ mol-1 and a value isg mg-1 menit-1. Adsorption mechanism of methylene blue dyes on active carbon at various concentration of hazelnut shell is chemical adsorption process.
It has been conducted a research about the utilization waste of tofu as adsorbent of tartrazine dye. Utilization waste of tofu as adsorption because tofu contains protein which has the power adsorption of amino acids that form a zwitter ion. The purpose of this study was to determine the adsorption process and adosrption kinetics model of tartrazine dye by waste of tofu as adsorbent. Making the adsorbent is done by making waste of tofu into powder with a size of 100 mesh. The method used in the analysis of tartrazine dye is using UV-Vis. Adsorption of of tartrazine dye using waste of tofu at concentrations of 50 ppm and a contact time of 80 minutes with weight adsorbent 0.3 g. The two isotherms were used that Langmuir isotherm and Freundlich isotherm, the adsorption studies of tartrazine dye adsorbent waste of tofu follow Freundlich adsorption isotherms with a correlation coefficient (R2) of 94.4%, KF is 0.0026 mg/g and n is 0.5621. Adsorption kinetics of of tartrazine dye adsorbent waste of tofu following the model of adsorption Ho pseudo-second order with a correlation coefficient (R2) of 100%, Xe is 1.7761 mg/g and k2,ads is -0.6550 g/mg minutes. The mechanism adsorption of of tartrazine dye with waste of tofu as adsorbent is chemisorpsi process.
The chitin isolation from crab Rajungan (Portunus sanginolentus) and commercial chitin was done. The chitosan was made by deasetilation of chitin using alkaline solution with addition NaBH4. The chitin and chitosan were identified by related instrument. The identification by adsorption Cr(III) ion on chitosan was done by the Atomic Absorption Spectrofotometry. The result of the chitosan isolation was fitted to the Freundlisch isotherm, with KF = 1.18673 mg/g and 1/n= 0.2712.
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