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Title: | 利用石墨烯改質海綿去除水中油品及亞甲基藍效能之研究 Capabilities of Graphene Modified Sponge to Remove Oils and Methylene Blue from Water |
Authors: | Cheng Hui Low 羅健輝 |
Advisor: | 駱尚廉 |
Keyword: | 石墨烯海綿,石墨烯泡棉,油吸附,染料吸附,揮發性有機物, graphene sponge,graphene foam,oil removal,dye removal,volatile organic compound, |
Publication Year : | 2019 |
Degree: | 碩士 |
Abstract: | 近年來許多學者投入利用石墨烯海綿進行水處理的相關研究,而研究成果也顯示利用石墨烯氧化物改質海綿可以有效率去除水中油品及染料。雖然石墨烯海綿效能良好,但因為製造過程成本昂貴,至今在乃為商業化。為了降低製造成本,本實驗未使用表面塗膜法,而選擇在合成海綿的同時加入石墨烯,省去後續表面塗膜法的程序。本研究探討利用合成石墨烯海綿去除各類污染物之效能研究。
本論文選擇了三類不同的污染物,分別是各種油品,亞甲基藍染料及揮發性氣體。針對各種油品的吸附能力,本實驗利用重量分析法進行研究,從而得出石墨烯海綿的動力吸附模式。石墨烯海綿在每隔10s的時間內進行稱重來取得其吸附速率及最大吸附容量。更近一步透過空氣壓縮機利用空氣直接把已吸附油品的石墨烯海綿進行物理脫附,並研究其再利用能力;再者,利用分光儀來分析水中亞甲基藍的濃度,並探討石墨烯海綿對水中亞甲基藍的吸附效能與速率;最後,本研究將石墨烯海綿架設成空氣過濾器的濾床,透過氣相層析儀器分析丙烷與丁烷的濃度,研究兩種揮發性有機氣體在該裝置下的去除效能。 研究結果顯示,利用電子顯微鏡在不同倍率條件下未改質海綿與石墨烯海綿的成像有所不同,確認石墨烯海綿的製造方法成功加入了石墨烯原料,另外透過X射線光電子能譜儀分析結果證實上述製造方法的可行性。數據顯示石墨烯海綿吸附高稠度油品能力比低稠度來的好(分別為 12.4 g/g 與 11.6 g/g) 。而石墨烯海綿吸附亞甲基藍的能力在高pH值的條件比低pH值的條件來得有效率 (93 % 和22 %的濃度) 。置於揮發性有機氣體,在本實驗未能發現石墨烯海綿具有顯著去除揮發性有機氣體的能力。 本研究所得出的石墨烯海綿吸附能力相較其他學者製成的石墨烯海綿來得差一些,但其原因可能為兩者之間石墨烯含量的差別,相信提高合成石墨烯海綿過程中的石墨烯含量時,可以提升石墨烯海綿的吸附能力。本研究提出新的石墨烯海綿生產方式,其製成已可在工廠內實際操作,透過該製作方法可以大幅度的降低石墨烯海綿的製造成本,提供一種未來商業化石墨烯海綿的可行方法。 The use of graphene sponge in treating wastewater has been studied for some years. Relevant results have suggested the active role of graphene oxide sponge in oils and organic dyes removals. Despite its effectiveness, its use in the market is rarely observed due to its high cost in manufacturing. To reduce the cost, instead of coating graphene on the surface of sponges, this study selected a synthesizing process of graphene sponge which combined both polyurethane and graphene simultaneously. This research investigated the various contaminant removal capabilities of graphene sponge by using a low-cost production method. This article engaged three different pollutants, namely, oils, Methylene blue (MB) solution, and volatile organic compounds (VOC). The gravimetric method was adopted to achieve the adsorption kinetics of different oil solutions. The graphene sponge was weighted every 10 seconds to obtain the sponge adsorption rate and maximum capacity. An air compressor was used to desorb the oils from the graphene sponges for reusability test. The removal of Methylene blue solution was investigated by utilized a spectrophotometer to analyze the concentration of MB. The initial and final concentrations of Methylene blue solution were measured to calculate the Methylene blue adsorption capacity of the graphene sponge. The removal of propane and butane were studied by the use of graphene sponge as an air filter. The Gas Chromatography (GC) was applied to quantify the concentration of both volatile organic compounds. The success of the coating method in this research is strongly suggested by the different surface appearances of regular sponge and graphene sponge demonstrated in the Scanning Electron Microscope (SEM). This conclusion is further supported by the analysis of X-ray Photoelectron Spectroscopy (XPS). The capacity experiment results show that the graphene sponge is more effective in adsorbing high viscosity oils compared with low viscosity oils (12.4g/g and 11.6 g/g respectively). As for the Methylene blue solution, high pH value of Methylene blue solution is superior to low pH value in the removal capacity (93% and 22% respectively). In the case of VOCs, graphene sponge has no significant ability to remove the gaseous contaminants. Though the smaller amount of graphene inside the synthesis graphene sponge in this research led to the relatively low adsorption performance compared to those of the other previous research which possessed a higher percentage of graphene, this could be solved by increasing the percentage of graphene content during the combining process. This research may provide an alternative manufacturing process of graphene sponges in the future, as the synthesizing method, which is now able to be produced in factories, is comparably cheap and practically achievable. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/73904 |
DOI: | 10.6342/NTU201903364 |
Fulltext Rights: | 有償授權 |
Appears in Collections: | 環境工程學研究所 |
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