在壓電觸媒材料的研究領域中，主要是使用粉末狀的壓電觸媒材料直接進行壓電降解實驗，過程中染劑顏色變化十分容易觀察，在本團隊先前所發表的研究之中，二硫化鉬的降解特性也已經達到了十分優秀的地步，然而在降解的過程中，因為二硫化鉬分子的高比表面積與染劑分子的直接接觸，很容易造成染料分子與材料的吸附效應，而吸附效應的存在一直是影響我們分析材料降解能力的重要瓶頸。因此本研究主要在開發全新的降解方式，將粉末二硫化鉬壓電觸媒材料加入去離子水，超音波震盪之後利用離心分離的方式將粉體與溶液分離，此步驟經過簡易化學量測證實可將99 %以上之粉體移除，留下漂浮的少數層及單層二硫化鉬在溶液中，我們發現此透明溶液具備高度的活性，將此活性溶液與染劑溶液混合之後，可觀察到顏色的變化，這代表著染劑分子濃度的降低以及此溶液具有降解特性，而根據初始加入的二硫化鉬粉末量多寡，可發現活性溶液的降解特性與粉末量呈現正相關的成長趨勢，在粉末量為250 mg時可達到80 %以上的降解效果，而因為已移除了99 %以上的粉末，吸附效應基本上已經不是重要的課題，也因此可以完全展現出壓電氫氧自由基的降解特性，也可以說明氫氧自由基的降解機制才是整個壓電降解過程的主要機制。另外利用螢光效應光譜儀的分析鑑定，也發現氫氧自由基的訊號隨著初始粉末量的提升而提升，因此我們可以確認在此活性溶液中確實存在氫氧自由基並且具有降解染劑之能力，另外我們也發現溶液中之氫氧自由基之存在時間比起以往發表的研究要高出許多，本團隊認為這是因為F-center的緣故所造成，並詳細說明其反應過程及機制，來解釋這樣驚人的氫氧自由基存在時間。

In the research field of piezo-catalytic material, the primary way of degradation process is mixing powder materials with dye solution directly. The color variation of dye solution is easy to be observed. In our previous work, MoS2 (Molybdenum disulfide) nanoflowers have highly piezo-catalytic properties. However, the greatly specific surface area of MoS2 nanoflowers results in the significant adsorption effect, which will hinder the analysis of degradation.
In this study, we reported a new way of degradation, we mixed MoS2 nanoflowers with Di water and then ultrasonically vibrated for a period of time. Finally, we used centrifuge to separate the powder and solution, which was confirmed by simple measurement that over 99 % of the powder was removed. There would be a little single- and few- layered MoS2 nanoflowers remained in the solution and we found that the solution was catalytic. The catalytic properties of as-prepared solution were found to be proportional to the amount of MoS2 nanoflowers we added. The catalytic activity of the solution for decomposing Rhodamine B (RhB) solution could reach 80 % when 250 mg of the MoS2 nanoflowers was added. We could ignore the adsorption effect because of the 99 % removal of the powder. Therefore, OH radicals degradation mechanism could be regarded as the primary mechanism. The florescent spectra indicated the concentration of OH radicals in our as-prepared solution increases with the increasing amount of the MoS2 nanoflowers we added. The lifetime of OH radical in our as-prepared solution is up to five hours according to our observation. Our team thought that it is because of the F-center defects, which contributed to the amazingly long lifetime of OH radical.

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