The Research For Adsorption Of Metal Ions By Algae

• Main Authors: Tien, Pei, 田珮
• Other Authors: Wei, Guo-Zuo
• Format: Others
• Language: zh-TW
• Published: 1997
• Online Access: http://ndltd.ncl.edu.tw/handle/56962629071288580791

碩士 === 國立中正大學 === 化學研究所 === 85 === Abstract The research for the adsorption of metal ions by algae is divided into three parts. Part I described the immobilization of algae and their analytical performance of the immobilized algae for the preconcentration of trace Cu in water. Chlorella was used to study the immobilization of algae. Three different methods , silica gel , polyacrylamide and sodium silicate , were employed to immobilize algae. The maximum adsorption sites of algae was evaluated by employing * Scatchard plot *. The application of silica immobilized algae to preconcentraion trace amounts Cu was evaluated in several different solution. From a factor of 100 times of preconcentration , Cu2+ concentration in tap water and sea water were founded to be 0.61ppm with 5.48 % of RSD and 0.42ppm with 1.15 % of RSD , receptively. The adsorption study of silica immobilized algae was extended to Nannochlorpsis. Part II discussed the determination of metal in algae by the graphite furnace atomic absorption spectrometry . Microwave digestion was used for the treatment of algae . Then the graphite furnace atomic absorption spectrometry was used to measure the concentration of copper and cadmium in algae . Standard reference material of nonfat milk (NBS SRM1549) was employed to verify the accuracy of the measurement .The results from standard reference material demomenateated that the method can be used to measure the concentration of copper and cadmium in algae. Part III described the use of adsorption model to evaluate the adsorption sites in algae.The objective of this study is known the adsorption capacity of Cu , Cd , Zn and Ca onto the algae. Scatchard plot was employed to estimate the maximum adsorption site of each metal;the adsorption of Ca2+ is the worst , and the adsorption of Cu2+ and Ag+are better.Also, the maximum adsorption capacity of Cu ,Cd and Zn were estimated when the adsorption sites had already saturated with Ca2+. A simple model to estimate the percentage of overlap between two metals was proposed.The results indicated that the adsorption sites of Cu2+ and Ag+ overlapped with those of Ca2+. While,the adsorption sites of Cd2+ and Zn2+ partly overlapped partly with those of Ca2+.