以離子交換樹脂承載奈米金屬 薄膜對水中2,4-二氯酚脫氯之研究

• Main Author: 葉宏洲
• Other Authors: 蘇弘毅
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/30942088552217113303

碩士 === 弘光科技大學 === 環境工程研究所 === 100 === In this study, a synthesized cation exchange resin supported nano zero valent iron (NZVI) complex forming NZVI-resin was proposed for the dechlorination of 2,4-dichlorophenol (2,4-DCP), taking into account reaction time, 2,4-DCP initial concentration, pH, mixing speed, reaction temperature and composition of nickel and iron. Further investigation on feasibility study to the real case, the fixed column type reactor was introduced into this study. From results, the successful dechlorination of the 2,4-DCP solution to produce phenol and chloride ions was observed using a bimetallic NZVI-resin in batch reactor. The best mixing speed was observed at 200 rpm. Solution pH affects the 2,4-DCP dechlorination efficiency significantly. A high dechlorination efficiency of 91% can be reached in 20 min at pH 6, while only about 20% dechlorination at acidic pH 2. Increasing the reaction temperature up to 60℃ can enhance the dechlorination rate. The best iron to nickel ratio was 42.5 mgFe 9.8 mgNi/g-resin. The kinetic studies showed that the dechlorination reaction followed pseudo-first order reaction. A mixture of 2-chlorophenol, 2,4-dichlorophenol and 2,4,6-trichlorophenol was tested in the batch IV reactor with addition of bimetallic NZVI-resin. The 2,4,6-TCD dechlorination efficiency in 20 min can be reached 70%. For fixed bed column reactor with flow rate of 5 mL/min, breakthrough volume of 2100 mL was observed. Temperature regime from 20 to 25℃ was the best performance for this column operation.