應用有機黏土及竹碳吸附水中4-壬基苯酚(4-nonylphenol)

Adsorption of 4-Nonylphenol in Water by Organic Clay and Bamboo Charcoal

謝蕙如(Hui- Ju Hsieh)

指導教授 ： 林嘉明

國立臺灣大學/公共衛生學院/環境衛生研究所/碩士(2006年)

https://doi.org/10.6342/NTU.2006.00168

摘要

壬基苯酚（nonylphenol）屬內分泌干擾物質，在低濃度(<10 μg/L)下即會干擾生物體體內荷爾蒙之作用，導致生殖、發育等危害甚至引發惡性腫瘤。全球目前普遍都受到此類化合物之污染，可是傳統水處理單元對於去除此類化合物之效果有限，而利用吸附劑吸附可能是一種有效的處理方法。近年來在台灣逐漸熱門的新興材料-竹碳及有機黏土，皆是具有高比表面積之多孔物質。因此本研究探討有機黏土及竹製活性碳對水中壬基苯酚之吸附現象。
本研究之等溫吸附試驗是在25℃下，使用0.3 mg吸附劑對100 mL水中壬基苯酚進行15個小時的吸附，以比較有機黏土及竹碳去除水中壬基苯酚的效果；並且對於吸附效果較好的有機黏土Cloisite R 15A及竹碳MOB2進行動力吸附試驗之觀察。試驗結果：有機黏土Cloisite R 15A去除效果最佳，去除效果之95%信賴區間為74.38 4.31%；竹碳MOB2之去除率95%信賴區間為54.92 14.59%；竹碳MOB3之去除率95%信賴區間為53.31 14.59%；竹碳MOB1之去除率95%信賴區間為24.25 11.05%；竹碳MOB4則沒有可察覺之去除效果。擬合Freundlich等溫吸附模式，除竹碳MOB4無法擬合外，其他吸附劑之擬合程度介於0.73~0.99之間。動力吸附試驗結果顯示有機黏土Cloisite R 15A在第4個小時後達平衡；竹碳MOB2在第15個小時後達平衡。故認為有機黏土15A不論是吸附達平衡所需時間或是去除效率而言，皆較適合實場應用去除水中壬基苯酚之吸附劑。

關鍵字

壬基苯酚 ； 等溫吸附 ； 有機黏土 ； 竹碳

並列摘要

Nonylphenol is an endocrine disruptor that is able to interfere the functions of endocrines resulting in reproductive, developmental and/or carcinogenic effects. It is a globe-wide environmental contaminant and can not effectively removed by the routine water treatment. Its removal from water by adsorption has expected to be one of the promising ways. Thus, this study looked into the adsorption of 4-nolyphenol in water by adsorbents. One organic clay and four bamboo charcoals were tested just because they are proposed to be the porous materials with great specific surface areas and are getting more and more popular in Taiwan.
Adsorption isotherm test for each adsorbent was performed at 25℃ for 15 hours by adding 0.3 mg adsorbent into 100 mL aqueous solution containing five levels of 4-nonylphenol. The kinetic of adsorption for the adsorbents with good performance, that are Cloisite®15A and bamboo charcoal MOB2 were also observed. The results show that the Cloisite®15A had the best removed rate with 95% confidence interval of 74.38 4.31%, while the others had 54.92 14.59%, 53.31 14.59%, and 24.25 11.05% for bamboo charcoal MOB2, bamboo charcoal MOB3 and bamboo charcoal MOB1, respectively. Only the bamboo charcoal MOB4 did not demonstrate its adsorption capability of removing nonylphenol. The adsorption well fit the Freundlich isotherm with R2 in 0.73 - 0.99. The kinetic of adsorption indicated that the equilibrium was reached after 4 hours for the system with the Cloisite®15A, compared with 15 hours for the one with the bamboo charcoal MOB2. It is concluded that the Cloisite®15A is a more efficient adsorbent for application on the removal of 4-nonylphenol in water than bamboo charcoals.

並列關鍵字

nonylphenol ； adsorption ； organic clay ； bamboo charcoals

參考文獻

黃世昌，2005，有機黏土對對硝基酚、酚及苯胺之吸附，國立台灣大學環境衛生研究所碩士論文。

曹功勳，2001，改質黏土吸附酚類化合物之平衡與動力學，元智大學化學工程學研究所碩士論文。

Alter G., 2002, Using organoclays to enhance carbon filtration, Waste Management 22: 507-513.

Ball H.A., Reinhard M., and McCarty P., 1989, Biotransformation of halogenated and nonhalogenated octylphenol polyethoxylate residues under aerobic and anaerobi conditions, Environmental Science and Technology 23: 951-961

Biniak S., Pakula M., Szymanski G.S., and Swiatkowski A., 1991, Effect of activated carbon surface oxygen- and/or nitrogen-containing groups on adsorption of copper (II) ions from aqueous solution, Langmuir 15: 6117-6112.