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標題: 改質奈米碳管吸附水中BTEX之研究
A Study on the sorption of BTEX from water with purified carbon nanotubes
作者: 胡舒剴
Hu, Suh-Kai
關鍵字: Carbon nanotubes;奈米碳管;Adsorption;Benzene;Ethylbenzene;Toluene;p-Xylene;吸附;苯;甲苯;乙苯;二甲苯
出版社: 環境工程學系所
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本研究藉由不同化學藥劑(HCl, H2SO4, HNO3及NaOCl)改質自備奈米碳管(carbon nanotubes,CNTs)吸附水中芳香環類有機溶劑苯(Benzene)、甲苯(Toluene)、乙苯(Ethylbenzene)、二甲苯(p-Xylene),合稱(BTEX)。奈米碳管經改質處理後,顯示其金屬催化劑與觸媒載體被移除,提高奈米碳管的開口率、增加表面活性位址,產生有利於吸附之官能基。其吸附結果顯示對BTEX吸附量分別為NaOCl>HNO3>H2SO4>HCl。經由改質後,CNTs表面的官能基增加且表面羧基(carboxylic groups)可促使BTEX上的π鍵有電子轉移現象增加之吸附機制。由批次吸附實驗顯示次氯酸鈉改質自備奈米碳管CNT(NaOCl)吸附BTEX之吸附量隨著溫度降低、離子強度上升而有增加的趨勢而pH影響不大。以Langmuir等溫吸附模式求出經由次氯酸鈉改質其最大吸附量為苯(118.49mg/g)、甲苯(140.73mg/g)、乙苯(357.28mg/g)、二甲苯(515.51mg/g)比未改質CNTs高出三倍,也高於粒狀活性碳(GAC)。

Carbon nanotubes (CNTs) were fabricated by the catalytic chemical vapor deposition method and oxidized by HCl, H2SO4, HNO3 and NaOCl solutions for enhancing benzene, toluene, ethylbenzene and p-xylene (BTEX) adsorption in an aqueous solution. The NaOCl-oxidized CNTs show the greatest enhancement in BTEX adsorption, followed by the HNO3-oxidized CNTs, and then the H2SO4-oxidized CNTs. The adsorption mechanism of BTEX via CNTs is mainly attributed to the π-π electron-donor-acceptor interaction between the aromatic ring of BTEX and the surface carboxylic groups of CNTs. The equilibrium amount of BTEX adsorbed on CNTs(NaOCl)(qe) increased with agitation speed, contact time, initial BTEX concentration and solution ionic strength but appeared no remarkable change with solution pH.The maximum adsorbed amounts of BTEX onto heated CNT(NaOCl) calculated by the Langmuir model at 25oC were (B:118.49mg/g, T:40.73mg/g, E:357.28mg/g, X:515.51mg/g) respectively,which were much higher than that onto commercially available granular activated carbon.
The thermodynamic analysis, the adsorption of BTEX onto CNTs(NaOCl) is an exothermic and spontaneous process. A comparative study on the adsorption of BTEX among CNTs, CNT(NaOCl) and GAC showed that under the same conditions the CNT(NaOCl) possess superior adsorption capacities for of BTEX than the CNTs and GAC. The adsorption/desorption study indicated that the CNT(NaOCl) have better reversible adsorption performance than the commercially available CNT(NaOCl) and GAC. This suggests that the as-prepared oxidized CNTs are promising BTEX adsorbents and have good potential for BTEX removal in wastewater treatment.
其他識別: U0005-1607200821401600
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