跳到主要內容 :::

年度	106	專案性質	實驗性質
專案類別	研究專案	研究主題	整治
申請機構	國立屏東科技大學	申請系所	環境工程與科學系
專案主持人	陳冠中	職等/職稱	教授
專案中文名稱	研發光觸媒覆膜材料以提高光纖光催化處理地下水中三氯乙烯之應用性
中文關鍵字	光催化透水性反應牆,覆膜光纖,無機樹脂,三氯乙烯,現地整治
專案英文名稱	Research and development of innovative photocatalyst coating material to enhance the applicability of trichloroethylene treatment in groundwater by optical fibers photocatalyzation.
英文關鍵字	photocatalytic permeable reactive barrier, coated optical fiber, inorganic resin, trichlorethylene, in-situ remediation
執行金額	700,000元
執行期間	2017/1/9 至 2017/11/30
計畫中文摘要	本研究研發覆膜液作為光纖表面與光觸媒之結合媒介，探討不同覆鍍模式及配方對光傳輸距離及側光光強度、反射率及穿透率變化、光纖表面覆鍍觸媒分佈性與結構性、光纖光降解及光催化效率、並以最佳配方進行不同光照強度之光催化效率探討，以及後續光催化產生氫氧自由基效率評估與COFB透水性反應牆之土壤砂箱試驗。本研究規劃主要以聚乙烯醇、無機樹脂、氟樹脂3種覆膜液種類作為覆膜基底，並以覆膜基底與稀釋劑不同比例進行試驗，探討不同基底/稀釋劑-水比例，分別為25：75與50：50，後續再添加PTFE溶液(20、40、80 mL/L)，混合攪拌均勻後，即為光纖外層之覆膜材料。 研究以PVA膠體進行不同PTFE添加量與稀釋比例試驗，研究結果顯示，添加PTFE溶液會提升光源於光纖內部傳輸之反射率，並且經過不同PVA與水之摻雜比例，得到不同每段光照強度，證明當膠體物質較高，附著於光纖上之PTFE含量將會相對增加。但由光降解試驗得知，在50：50摻雜比例條件下，添加較高劑量的PTFE溶液，將不利於光源傳輸，導致光纖後端TCE去除率較低。因此，在SEM&EDS分析方面，藉由分層與混合支覆鍍模式，探討光纖表面觸媒分佈性與元素含量百分比，研究結果得知，隨著觸媒及PTFE摻雜比例提升，有助於觸媒覆鍍於光纖表面含量增加，光纖表面之Ti及F元素比例隨著添加量增加而相對提升。而分層與混合覆鍍結果可以發現，分層覆鍍可使觸媒達到較均勻的分佈性。研究再進一步以不同覆鍍模式、不同覆膜液種類、以及不同覆膜液觸媒添加劑量條件下，實驗結果得知，以分層覆鍍之無機樹脂，稀釋比例25:75以及0.5 wt% TiO2會得到最佳光源延伸性，可有效地將光源延伸至6-8 cm。另一方面，在穿透率與反射率試驗也有相同結果，當觸媒添加量由0.5增加至5 wt%將不利於光源傳輸。 在光纖光降解與光催化效果方面，研究以不同覆膜液種類與配方進行TCE去除效率之探討，實驗結果得知，以新穎覆膜液進行光纖覆鍍，確實可有效提升光催化效率，而覆膜配方以分層較混合為佳。另一方面，在不同覆膜液稀釋比例方面，以25:75覆膜比例，並以分層的覆膜方式進行光催化處理效率最佳，其中以無機樹脂覆膜液光催化效果優於其他2種覆膜液。在光照強度方面，若增加光照強度可有效提升光源傳輸距離，並增加光纖光催化之距離。 實驗最後以最佳覆膜條件進行COFB透水性反應牆之砂箱試驗，結果顯示，　TCE與TOC之去除效率會隨著經過COFB處理而提升，並且氯離子(Cl-)生成將隨著TCE之去除率提高而增加，此結果再次證明光催化有效的將TCE降解為最終產物。本研究並進行初步之處理成本效益評估。
計畫英文摘要	In this study, the coating liquid was used as the bonding medium between optical fiber’s surface and photocatalysts. The effects of different coating methods and formula on the light transmission distance and side light intensity, reflectivity and transmittance of optical fibers were discussed. The photodegradation and photocatalytic efficiency of the optical fiber were studied, and the photocatalytic efficiency of different light intensities was discussed with the best formulation, as well as the evaluation of the free radicals formation and the soil sandbox test with COFB permeable reaction wall. In this study, three kinds of plastic film types, such as polyvinyl alcohol (PVA), inorganic resin and fluororesin, were used as the coating substrate. The different substrates/diluents were tested with different ratio of film base and diluent-water ratio of 25:75 and 50:50, respectively, followed by the addition of PTFE solution (20,40,80 mL/L), after stirring evenly, which were used as the coating material for photocatalyst coated fiber preperation. The results show that the addition of PTFE solution does improve the reflectivity of the light source in the fiber, and after different PVA and water doping ratios. Study of applying different light intensities show that higher concentration of colloidal substances attached to fibers on the PTFE content resulted in higher light intensity transmittion. However, it was found that the addition of higher dose of PTFE solution at 50:50 doping ratio would be detrimental to the light source transmission, resulting in lower efficiency of TCE removal at the end of the fiber. Therefore, in the SEM & EDS analyses, the distribution of photocatalysts on the surface of optical fibers and the percentages of the elements’ content were discussed by the stratified and mixed support platings. The results show that with the increase of photocatalyst and PTFE doping ratio, the contents of Ti and F on the surface of the optical fibers increased with the increase of the amount of the photocatalysts. Comparing with stratified and mixed coating, it was found that layered coating achieved a more uniform distribution of photocatalysts. The experimental results also show that with the inorganic resin, the dilution ratio of 25:75 and the content of 0.5 wt% TiO2 of the inorganic resin with different coating conditions, different coating types, different coating liquid types and different coating liquid catalyst, got the best light source extensibility and effectively extended the light source upto 8 cm. On the other hand, the same results were obtained for the transmittance and reflectance test. The photocatalyst additive dose increased from 0.5 to 5 wt% would be detrimental to the light source transmission. In the aspect of fiber photodegradation and photocatalytic effects, the removal efficiency of TCE was studied with different coating types and formulations. The experimental results show that the photocatalytic efficiency can be improved by using the new coating liquid. The coating formulation is preferably mixed with layers. On the other hand, in the case of different coating liquid dilution ratio, the photocatalytic efficiency was the best at 25:75 coating ratio, and the photocatalytic effect was better than others. In the test with different light intensities, the best formulation enhanced the light transmission distance. As the light intensity increased the effective photocatalization of optical fibers increased. The results also show the concentrations of TCE and TOC decreased after passing through the COFB in the soil box. The chloride ion (Cl-) formed after the COFB treatment implies that photocatalysis effectively degraded TCE. The cost-effectiveness assessment of the treatment was also conducted in this study.