淡江大學機構典藏:Item 987654321/119087
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    题名: Recovery of iodide as triiodide from thin-film transistor liquid crystal display wastewater by forward osmosis
    作者: Chang, Hau-Ming;Chen, Shiao-Shing;Chen, Yu-Ting;Chang, Wen-Shing;Li, Chi-Wang;Nguyen, Nguyen Cong;Ray, Saikat Sinha;Cao, Dan Thanh Ngoc
    关键词: Forward osmosis;Iodide recovery;Triiodide;Membrane distillation;Draw solution
    日期: 2021-02-05
    上传时间: 2020-09-17 12:12:21 (UTC+8)
    摘要: Triiodide, a larger charged molecule compared to iodide, is thermodynamically favored with the presence of both iodide and iodine, and is easier to be retained by membrane processes. For the first time, iodide was recovered in the form of triiodide by forward osmosis (FO) for thin-film transistor liquid crystal display industries by preoxidation of iodide to triiodide. Partial oxidation by NaOCl was used to convert the iodide to iodine and then to form triiodide. Ethylenediaminetetraacetic acid disodium salt (EDTA-2Na), a commonly used chelating agent in the industry, was used as the draw solute because of its low reverse salt flux. The results revealed that the ideal efficiency of iodide recovery was at pH 3 with a preoxidation (adding 0.0150 M NaClO) for the 0.048 M iodide wastewater with a recovery of 98.5%. Additionally, the Pourbaix diagram and starch indicator were used to verify the formation of triiodide. Membrane distillation was demonstrated to recover the EDTA-2Na draw solute, and more than 99% of recoveries for the draw solutes with initial water flux of 12.0 L/m2 h were achieved, indicating that simultaneous recovery of the EDTA-2Na draw solute and water is feasible.
    關聯: Journal of Hazardous Materials Volume 403, 123637
    DOI: 10.1016/j.jhazmat.2020.123637
    显示于类别:[水資源及環境工程學系暨研究所] 期刊論文

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