ADSORPTION OF Cd(II) ION USING BLACK TEA WASTE ENCAPSULATED BY Ca-ALGINATE

• Main Author: WIDIANI (NIM: 20514047), DIAN
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/20026
• Institution: Institut Teknologi Bandung

Cadmium (Cd) is a heavy metal that is widely used by industries to produce a variety of products such as used in the mining industry, coating industry, plastics industry, textile industry, Ni-Cd battery products and as a pigment. The use of Cd in various industries is a source of cadmium contamination to the environment. Cadmium and its compounds are known to be carcinogenic to humans based on the carcinogenicity studies conducted both in epidemiology and mechanisms against mammalian cells. This metal can irritate the respiratory tract and exposure to this pollutant can also cause anemia, kidney disruption, lung damage, bone disease with effects similar to osteoporosis and itai-itai disease. The elimination of metal ions from waste water with good effectiveness, has now become a very important issue. The methods used to remove heavy metals from waste water are preciptiation, ion exchange, solvent extraction, ultrafiltration, reverse osmosis, electrodialysis, and adsorption. Adsorption is one of the alternatives that can be used to remove heavy metal ions. Adsorption is a method which is simple, free of sediment and requires minimal cost and place. Tea is one of the few drinks that are very popular in the world. The cell wall of tea is formed of cellulose and hemicelluloses, lignin, tannin and proteins that can be used as adsorbent. The use of adsorbent tea in powder form enlarges the surface area as the active side of the adsorbent, but the form of powder will complicate the process of separation between adsorbent with adsorbate after adsorption process when applied to environmental samples. Therefore, the technique to encapsulate tea powder into Ca-alginate was conducted to overcome these problems. Adsorbent studied in this research is Ca-alginate (Ca-A) and the tea powder is encapsulated in Ca-alginate (STCa-A). The optimum condition of adsorption of Cd (II) was obtained at pH 4 and a contact time of 4 hours with a maximum adsorption capacity for Ca-A and STCa-A row of 25,40 mg/g and 28,60 mg/g obtained using the batch method. The process of adsorption of Cd (II) followed the Langmuir isotherm and pseudo second-order kinetics. Binary system adsorption was conducted by the batch method using Cd(II), Pb(II) Ni(II) and Cu(II) metals, Ca-A and STCa-A adsorbent is known that not selective to one of metal. Study of STCa-A adsorption and desorption was conducted by circulation method and minimum time to adsorb all of Cd(II) ion is 300 minutes. Desorption process used 35 mL HNO3 1 M and produced 96,94% desorption efficiency.