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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 王明光 | |
dc.contributor.author | Ya-Ting Chan | en |
dc.contributor.author | 詹雅婷 | zh_TW |
dc.date.accessioned | 2021-06-13T00:08:09Z | - |
dc.date.available | 2010-07-31 | |
dc.date.copyright | 2007-07-31 | |
dc.date.issued | 2007 | |
dc.date.submitted | 2007-07-27 | |
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/28433 | - |
dc.description.abstract | 硒是人體與動物體內必要的微量元素,但過量攝取則會危害人體。硒的來源大多來自地質經雨侵蝕流至水庫或地下水。有一部份硒來自於工廠排放的廢水,當工廠過度排放含硒廢水,會使水中的硒濃度達到危害人體濃度。吸持作用對於環境中的硒分佈有相當大的影響,因此討論吸持作用與硒的分佈以及去除微量污染物是有其必要性。自然環境中,鐵、鋁氧化物是相當普遍的化合物,無定形二氧化矽具有低零電點,高比表面積的特性,但單一元氧化物存於環境中的並不多,因此本研究以氧化鐵或氧化鋁與無定形二氧化矽 (SiO2(s)) 形成之二元氧化物來吸持水溶液中的硒酸鹽與亞硒酸鹽,進而討論硒酸鹽與亞硒酸鹽和不同二元氧化物之間吸附的關係。以 100 mL 10 g SiO2(s)/ L與 10 mL 0.5 M Fe(NO3)3或Al(NO3)3混合,將pH值調整為約5和8,定量至1 L,震盪合成24小時,形成本研究所使用的二元氧化物。鐵、矽二元氧化物系統在吸附硒酸鹽與亞硒酸鹽隨pH下降,而移除率上升,系統pH約5下合成之二元氧化物移除率最大 (Se(IV) 94.7%;Se(VI) 53.3%);鋁、矽二元氧化物系統中,也是pH約5下合成移除率最大 (Se(IV) 81.7%;Se(VI) 71.4%),在高pH值的環境中,OH-會與硒酸根與亞硒酸根競爭吸附位置,所以高pH值下吸附力會下降。等溫吸附實驗中Se(IV)與Se(VI) 鐵、矽二元氧化物系統的最大吸附量分別為20.4 mg g-1及2.4 mg g-1;鋁、矽二元氧化物系統的最大吸附量Se(IV) 32.7 mg g-1及Se(VI) 11.3 mg g-1。動力吸附實驗結果顯示硒酸鹽與亞硒酸鹽系統分別在15與60分鐘後達平衡。吸附硒酸鹽系統中,由於二氧化矽之低零電點影響,使得鐵、矽二元氧化物系統之表面電位較低,以致於吸附硒酸鹽的能力較純氧化鐵低;雖然鋁、矽二元氧化物系統之表面電位與純氧化鋁並無差異,但由於純氧化鋁的比表面積可提供較多可吸附硒酸鹽位置,所以吸附能力也是較鋁、矽二元氧化物系統大。在脫附實驗研究中,亞硒酸鹽與吸附材料會產生內層吸附,而脫附平衡時間需要較久;硒酸鹽與吸附劑是水合外層吸附,因此30分鐘內可達脫附平衡。 | zh_TW |
dc.description.provenance | Made available in DSpace on 2021-06-13T00:08:09Z (GMT). No. of bitstreams: 1 ntu-96-R94623014-1.pdf: 1237516 bytes, checksum: 5c53d60720f01c345ecdd232098c2158 (MD5) Previous issue date: 2007 | en |
dc.description.tableofcontents | 目錄
口試委員會審定書………………………………………………………i 中文摘要…………………………………………………………………..i 英文摘要…………………………………………………………………iii 第一章 前言……………………………………………………… 1 第二章 文獻回顧………………………………………………… 3 2.1 硒的特性.............................................................................. 3 2.2 氧化鐵、鋁形成.................................................................. 5 2.3 氧化鐵、鋁表面特性.......................................................... 7 2.4 吸附現象理論...................................................................... 8 2.5 固液界面模式..................................................................... 10 2.6 氧化物 (氧化鐵、鋁) 對陰離子之吸附特性…............... 11 2.7 二相氧化物 (binary oxides) ............................................... 13 第三章 材料與方法……………………………………………… 14 3.1 實驗設計………………………………………………… 14 3.2 合成吸附劑……………………………………………… 15 3.3 吸附劑物化性質的研究………………………………… 15 3.4 吸附特性的研究………………………………………… 19 第四章 結果與討論……………………………………………… 22 4.1 合成吸附劑之物化特性………………………………… 22 3 4.2 吸附特性………………………………………………… 29 第五章 結論與建議……………………………………………… 51 5.1 結論………………………………………………………51 5.2 建議……………………………………………………….51 第六章 參考文獻………………………………………………… 52 | |
dc.language.iso | zh-TW | |
dc.title | 二元氧化物系統對於硒酸鹽與亞硒酸鹽之吸持作用 | zh_TW |
dc.title | Sorption of selenate and selenite on the binary oxides systems | en |
dc.type | Thesis | |
dc.date.schoolyear | 95-2 | |
dc.description.degree | 碩士 | |
dc.contributor.coadvisor | 官文惠 | |
dc.contributor.oralexamcommittee | 李達源,何聖賓,張大偉 | |
dc.subject.keyword | 二元氧化物,脫附,內圈與外圈錯合物,硒,吸持, | zh_TW |
dc.subject.keyword | Binary oxides,desorption,inner- and outer-sphere complexes,selenium,sorption, | en |
dc.relation.page | 59 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2007-07-30 | |
dc.contributor.author-college | 生物資源暨農學院 | zh_TW |
dc.contributor.author-dept | 農業化學研究所 | zh_TW |
顯示於系所單位: | 農業化學系 |
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