MAGNETITE-ALGINATE COATED CHITOSAN AS ADSORBENT ION METAL Cu(II)

• Main Author: Sa'adah, Nailys
• Format: Theses
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/34102
• Institution: Institut Teknologi Bandung

Presence of heavy metals in the water can come from various sources, including from mining activities, household, agricultural waste and industrial waste. The resulting contamination of heavy metals is very dangerous because it is toxic and can accumulate in sediment and biota, one of the heavy metal is copper (Cu). Copper is a heavy metal that is widely used in industry, especially in the electroplating industry, textile and metal industry (metal alloy). Copper accumulation in the body can cause disturbances in the brain, skin tissue, liver and pancreas. According to Indonesian Government Regulation No.82/2001, threshold of industrial waste water quality standard the metal coating industry with the maximum levels of 0.6 mg/L. The commonly used methods for removing metal ions include ultrafiltration, ion exchange, precipitation and adsorption. Adsorption is one method that is often used to remove heavy metal ions from industrial waste. Adsorption is considered very competitive with economical and effective cost and the absence of side effects of toxic substances. Encapsulation is the immobilization technique an active ingredient in the material support through the establishment of a specific framework that can trap the active ingredient therein. One material that can be used with encapsulation technique is alginate. Alginate is a polysaccharide that is not toxic, does not cause allergies, have the ability chelating process and can be modified. Modification of magnetite in the form of capsules in alginate can provide the advantage that in the process of separation between adsorbent and analyte. To increase the adsorption capacity and improve the physical quality of the adsorbent is carried Ca-alginate magnetite coating uses chitosan. The results of the synthesis of Ca-alginate magnetite coated chitosan before and after contact with Cu were characterized using FTIR produces some shift wave number at the peak of the metal-oxygen (Fe-O) 586.36 cm-1 to 592.15 cm-1, carbonyl (C=O) 1602.85 cm-1 to be 1620.21 cm-1, amine (N-H) 3387 cm-1 to be 3412.06 cm-1, as well as the emergence of a new peak at wavenumber 1726.29 cm-1 which is an attachment of metal Cu2+ on the carbonyl side. Based on the results of XRD, the diffraction pattern produced magnetite samples corresponding to the diffraction pattern of magnetite JCPDS (Joint Committee On Powder Diffraction Standards) number 19-0629. The optimum conditions of ion adsorption of ion Cu(II) by Ca-alginate and Ca-alginate magnetite coated chitosan determined using the batch by varying the pH, contact time, initial concentration and adsorbent mass. The optimum conditions of ion adsorption of ion Cu(II) in Ca-alginate and Ca-alginate magnetite coated chitosan obtained at pH 5, the contact time of 150 minutes, a mass of adsorbent is 0.05 grams and a maximum adsorption capacity each at 38.61 and 54.82 mg/g. The process of adsorption of ion Cu(II) by two adsorbents according to the Langmuir adsorption isotherm models and follow the model of pseudo second-order kinetics. Adsorption binary system is done by using metal Cd(II), Zn(II) and Pb(II) showed that the adsorbent Ca-alginate and Ca-alginate magnetite coated chitosan is not selective on the type of metal. Studies column with circulation method in offline process shows the minimum time required to adsorb all the ions Cu(II) of 1 ppm Cu solution in 500 mL is 660 minutes. Desorption ion Cu(II) is carried out using 40 mL HNO3 1 M. Reuse of the adsorbent showed that the adsorption-desorption can be carried out with 5 cycles. % recovery of ion Cu(II) on environmental samples of 74.05% indicates that the process of adsorption of ion Cu(II) can not take place with causes matrix interference.