Adsorption of 17-estradiol onto organo-montmorillonites
文献类型：会议论文
| 作者 | Zhou, J.2; Wan, Y.1; Liao, L.2 |
| 出版日期 | 1905-06-30 |
| 会议日期 | September 8, 2008 - September 10, 2008 |
| 会议地点 | Brisbane, QLD, Australia |
| 关键词 | Organic chemicals - Clay minerals - Endocrine disrupters - Organometallics - Solutions - X ray diffraction - Industrial chemicals |
| 页码 | 375-378 |
| 英文摘要 | Organo-montmorillonites were synthesised by intercalating different amounts of dodecyl trimethylammonium bromide, cetyl trimethylammonium bromide and stear trimethylammonium bromide into montmorillonite layers, and were used for the adsorption of 17-estradiol in aqueous solution. The adsorption kinetics and thermodynamic of 17-estradiol onto organo-montmorillonites and the effect of pH on the adsorption capacity of organo-montmorillonites for 17-estradiol were studied. The adsorption isotherms at 20C, 35C and 50C were measured. Results show that organo-montmorillonite has a high affinity for 17-estradiol. More 17-estradiol can be adsorbed on to organo-montmorillonite and the adsorption is more rapid at a lower temperature. The montmorillonite intercalated with cetyltrimethylammonium bromide with the amount equivalent to one times of its CEC has the highest adsorption capacity. For all organo-montmorillonites synthesised in this study, an optimum pH (around nine) for the adsorption of 17-estradiol exists. Before this pH 17-estradiol uptake increased with increasing pH. After that die 17-estradiol uptake decreased with increasing pH. Simulation of the isotherms indicated that the adsorption of 17-estradiol onto organo-montmorillonites is a spontaneous and exothermic process. Endocrine-disrupting chemicals (EDCs) are the focus of current environmental concern, as they can cause adverse health effects in an intact organism, or its progeny, subsequent to endocrine function. Most EDCs are man-made organic chemicals (industrial chemicals, crop protection products, antifouling compounds, pharmaceuticals and personal care products). In addition, EDCs can be naturally occurring in the environment (eg the natural female hormones estrone and 17-estradiol). Therefore EDCs, especially estrone and 17-estradiol, are ubiquitous in the aquatic environment receiving sewage inputs. Estrogen and 17-estradiol are among the most potent of all EDCs and are sufficiently stable to survive present sewage treatment processes and are reactivated during those processes through deconjugation (Clara, Strenn and Saracevic, 2004; Zhang and Zhou, 2005; Fukuhara et al, 2006; Butler and Guilbault, 2006; Volpe et al, 2006; Ren et al, 2007; Zeng and Li, 2007). In comparison to traditional contaminants such as pesticides, the concentrations of the most potent EDCs are low, generally within ng/one range. The current sewage treatment processes have limited capacity in removing certain EDCs (eg 17-estradiol, C18H24O2) It is therefore essential to install additional treatment processes to remove them from wastewater before discharge (Zhang and Zhou, 2005; Fukuhara et al, 2006; Lee, Jung and Kim, 2006). Adsorption is considered to be a possible way to remove EDCs from aqueous solution. Various adsorbents have been studied, including chitin, chitosan, ion-exchange resin, activated sludge, activated carbon (Clara, Strenn and Saracevic, 2004; Yoona and Westerhoffa, 2003; Zhang and Zhou, 2005; Fukuhara et al, 2006; Ren et al. 2007). Studies have shown that organo-montmorillonite has a high affinity for organic pollutants (Li, 1997; Zhu et al, 1998; Han et al, 2001). The aim of this work is to investigate the feasibility of removing 17-estradiol from aqueous solution by adsorption onto organo-montmorillonite. |
| 资助机构 | Australasian Institute of Mining and Metallurgy |
| 会议录 | 9th International Congress for Applied Mineralogy, ICAM 2008
 |
| 学科主题 | Adsorption |
| 源URL | [http://ir.ipe.ac.cn/handle/122111/59541]  |
| 作者单位 | 1.Institute of Process Engineering, Chinese Academy of Science, Beijing 100080, China 2.School of Materials Science and Technology, China University of Geosciences, Beijing 100083, China |
| 推荐引用方式 GB/T 7714 | Zhou, J.,Wan, Y.,Liao, L.. Adsorption of 17-estradiol onto organo-montmorillonites[C]. 见:. Brisbane, QLD, Australia. September 8, 2008 - September 10, 2008. |
入库方式： OAI收割
来源：过程工程研究所
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