本文關鍵詞：木棉基活性炭纖維的可見光光催化的性能研究　出處：《武漢紡織大學》2017年碩士論文　論文類型：學位論文

  更多相關文章： 木棉基ACF 光催化 共摻雜 CNT

【摘要】：當今社會快速發(fā)展,紡織領域中印染排放的廢水污染、汽車排放的尾氣污染等日益嚴重。各種各樣的治理方法被開發(fā)應用,而活性炭纖維(ACF)因比表面積大、吸附脫附快、吸附量大、孔徑適中等優(yōu)點,是近幾年來應用最廣泛、最新型的功能材料。本課題以木棉纖維為基體,采用化學活化的方法,制備Ag摻雜TiO_2木棉基ACF、Mn摻雜TiO_2木棉基ACF和CNT負載木棉基ACF三種活性炭纖維。采用FTIR、RAMAN、SEM、XRD、元素分析等對木棉基ACF的微觀結構和表面形態(tài)等進行表征,以亞甲基藍溶液模擬染色廢水,研究了木棉基ACF的吸附動力學,探究Ag、Mn對TiO_2木棉基ACF的可見光光催化降解性能的影響,比較不同摻雜量對木棉基ACF吸附性能的影響,并獲得最佳摻雜比。首先,采用凝膠-溶膠法制備7種不同Ag摻雜量的TiO_2木棉基ACF,以及木棉基ACF和TiO_2木棉基活性炭,結果表明:活性炭纖維的物相結構具有相似性,均存在石墨成分。Ag摻雜沒有與木棉基ACF發(fā)生化學鍵合,屬物理過程。摻雜Ag對活性炭纖維的可見光吸附性能有一定的提高。當Ag摻雜含量為0.5%,活性炭纖維吸附性能最佳,吸光度最小。用凝膠-溶膠法制備6種不同Mn摻雜量的TiO_2木棉基ACF。結果證明,Mn摻雜屬物理過程,不與ACF發(fā)生化學鍵合。摻雜可改善TiO_2的團聚以及龜裂,提升TiO_2木棉基ACF的可見光催化降解能力。當摻雜量n(Mn):n(Ti)=1:150時,制備的ACF的可見光吸附模擬廢水的性能最佳。Mn摻雜ACF具有較高重復使用率,經5次吸附處理,吸附率僅下降了36%,重復使用仍然保持較高的吸附與光催化降解率。最后選用孔徑為10~20nm的CNT浸漬負載,制備6種不同CNT負載量的木棉基ACF。結果發(fā)現(xiàn):CNT不與木棉基ACF發(fā)生化學反應,僅物理附著;隨CNT負載量的增加,木棉基ACF的吸附性能先增大后減小。當CNT負載量為12%時,吸附效果達到最好,制備的ACF炭化程度高且在可見光下具有良好的吸附活性。制備的三種木棉基ACF對亞甲基藍的吸附均適合準二級動力學方程模擬,屬單分子吸附。對于TiO_2木棉基ACF,當摻雜量較小時,Ag或Mn可以在TiO_2的導帶和價帶之間產生附加能級,降低其禁帶寬度,提高了TiO_2的光催化活性,擴寬其光響應范圍。當摻雜量較大時,過量的Ag或Mn在TiO_2表面附著,成為電子和空穴的復合中心,反而降低TiO_2的光催化活性。
[Abstract]:Nowadays, with the rapid development of society, the pollution of printing and dyeing wastewater and the exhaust gas of automobile are becoming more and more serious in the textile field. A variety of treatment methods have been developed and applied. Activated carbon fiber (ACFC) is the most widely used and new functional material in recent years because of its large surface area, fast adsorption and desorption, large amount of adsorption and moderate pore size, etc. In this paper, kapok fiber is used as the matrix. Three kinds of Ag-doped TiO_2 kapok based ACF and CNT supported kapok based ACF activated carbon fibers were prepared by chemical activation method. FTIR was used. The microstructure and surface morphology of kapok based ACF were characterized by elemental analysis, and methylene blue solution was used to simulate dyeing wastewater. The adsorption kinetics of kapok based ACF was studied, and the effect of Agnon mn on the visible photocatalytic degradation of TiO_2 kapok based ACF was investigated. The effects of different doping contents on the adsorption properties of kapok based ACF were compared, and the optimum doping ratio was obtained. Firstly, seven kinds of Ag-doped TiO_2 kapok based ACF were prepared by gel sol method. And kapok based ACF and TiO_2 kapok based activated carbon. The results show that the phase structure of the activated carbon fiber is similar, and there is no chemical bond between the carbon component. Ag doped and the kapok based ACF. It is a physical process. The absorption property of activated carbon fiber can be improved by doping Ag. When Ag doping content is 0.5, the adsorption property of activated carbon fiber is the best. The absorbance is minimum. Six kinds of TiO_2 kapok cotton based CFCs with different mn doping amount were prepared by gel-sol method. The results show that mn doping is a physical process. No chemical bonding with ACF occurs. Doping can improve the agglomeration and cracking of TiO_2. The visible light catalytic degradation ability of TiO_2 kapok based ACF was improved when the doping amount was 1: 150. The performance of the simulated wastewater by visible light adsorption of the prepared ACF is the best. Mn-doped ACF has a high reuse rate. After five times of adsorption treatment, the adsorption rate is only reduced by 36%. The repeated use still keeps high adsorption and photocatalytic degradation rate. Finally, the CNT impregnation loading with pore diameter of 10 ~ 20 nm is selected. Six kinds of CNT loaded kapok ACFs were prepared. The results showed that CNT did not react with kapok ACF, but only physically adhered to them. With the increase of CNT loading, the adsorption performance of kapok based ACF firstly increased and then decreased. When the amount of CNT loading was 12%, the adsorption effect was the best. The prepared ACF has high carbonization degree and good adsorption activity under visible light. The adsorption of methylene blue by three kinds of kapok based ACF is suitable for quasi-second-order kinetic equation simulation. For TiO_2, Ag or mn can produce additional energy levels between the conduction band and valence band of TiO_2, and decrease the band gap. The photocatalytic activity of TiO_2 is improved and the range of photoresponse is broadened. When the doping amount is high, the excess Ag or mn is attached to the surface of TiO_2 and becomes the composite center of electron and hole. On the contrary, the photocatalytic activity of TiO_2 was decreased.
【學位授予單位】：武漢紡織大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TQ424;TB34

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