Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/5802
標題: 以CNT/TiO2奈米材料處理水中苯乙烯、正丁苯、雙酚A
Removal of styrene, N-butylbenzene and bisphenol A from aqueous solution with CNT/TiO2 nanomaterials
作者: 李司千
Li, Szu-chian
關鍵字: 改質奈米碳管;Modified CNTs;二氧化鈦;苯乙烯;正丁苯;雙酚A;TiO2;Styrene;n-Butylbenzene;Bisphenol A
出版社: 環境工程學系所
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摘要: 
本研究探討奈米碳管(Carbon nanotubes, CNTs)與TiO2材料處理水中苯乙烯(Styrene, SM)、正丁苯(N-butylbenzene, nBB)及雙酚A(Bisphenol A, BPA)之可行性。在第一階段中,CNTs分別經H2SO4、HNO3、NaOCl與熱處理(H-CNT)改質後進行批次吸附實驗,結果顯示CNT(NaOCl)對SM、H-CNT對BPA與nBB有較佳吸附量,在最佳操作條件下,SM、BPA、nBB平衡吸附量分別為129.67、86.43、14.29 mg/g,去除效率分別為52、94、84%,均較粒狀活性碳與甲殼素(Chitosan)佳。水質環境實驗中,BPA於pH大於9後吸附效果急遽降低,而有機污染物的吸附於低溫條件較佳。經動力模式分析,這三種污染物的吸附皆屬於擴散作用。經等溫吸附分析,此吸附反應較符合單層吸附;透過熱力學參數計算,三種物質的吸附皆為自發反應,且固液介面親和力良好,有利吸附反應。
第二階段則製備CNT/TiO2複合材料配合紫外光降解污染物,以CNT(NaOCl)為基材對SM、nBB降解效率最佳,而BPA則以CNT(HNO3)最佳。SM、nBB、BPA八小時降解率分別為80.6、89.5、73.6%,優於商用光觸媒P25,且證實CNTs之添加有助於光催化反應之進行。另一方面,水中離子強度會降低光降解效率,而酸性條件下催化效果較低,鹼性則略低於中性,但BPA的降解中鹼性則有最佳之去除率,而污染物去除率則隨水溫上升而增加。
綜合上述研究成果證實,CNT/TiO2材料能有效去除水中SM、nBB、BPA等水中新興污染物,且具備再生特性與連續操作等優勢,具有良好之環境應用潛力。

Carbon nanotubes (CNTs) were employed as adsorbent to study the treatment of styrene(SM), n-butylbenzene(nBB) and bisphenol A(BPA) in aqueous solutions. For enhancing adsorption capacities of these compounds, CNTs were oxidized by H2SO4, HNO3 and NaOCl or pretreated by heat at 400 ºC. The NaOCl-oxidized CNTs showed the best performance on SM while the heat-pretreated CNTs showed the best performance on nBB and BPA. Adsorption amounts of SM, nBB and BPA on modified CNTs were 129.67, 86.43, 14.29 mg/g, displaying better performance than granular activated carbon and chitosan. Adsorption amounts of SM, nBB and BPA increased with solution ionic strength but those of BPA decreased with solution pH between 9 and 12. Thermodynamic studies indicated that adsorption of SM, nBB and BPA on modified CNTs are all spontaneous and exothermic reactions.
After adsorption studies, the CNT-based TiO2 photocatalysts been prepared by the sol-gel method, and remove the pollutants with UV light support. The NaOCl-oxidized CNT-based TiO2 showed the best performance on SM and nBB, and the HNO3-oxidized CNT-based TiO2 appeared the superior performance on BPA. The removal efficiencies of SM, nBB and BPA on CNT-based TiO2 photocatalysts were 80.6、89.5、93.9%, showing better performance than non-CNT-based TiO2 and P25.
The modified CNTs possess good adsorption performance while the CNT-based TiO2 have good photodegradation performance for SM, nBB and BPA in aqueous solutions. As a result, they are promising for controlling these compounds in wastewater treatment.
URI: http://hdl.handle.net/11455/5802
其他識別: U0005-0907201317403400
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