| 摘要: | 人工食用色素為化學合成的色素，對不同的土壤有不同的影響。容易被酸性土壤吸收，由於其分子大且有離子鍵。因此土壤成分也會影響其吸附水平。從文獻指出人工食用色素會對人體造成傷害，如生育力下降、畸形胎，甚至可能會致癌。從過去相關的文獻，顯示出土壤中天然鐵氧礦物催化Fenton-like氧化法能處理眾多溶解相和非溶解相之污染物。因此本研究利用針鐵礦去模擬天然鐵氧礦物去催化過氧化物，來進行Fenton-like反應來去除人工食用色素此類污染物。並藉由調整不同的參數如：pH值、針鐵礦的含量和H2O2濃度與加入次數。故選用亮藍FCF，利用此系統進行，來探討對此污染物的去除的變化特性。
從結果顯示，當增加H2O2濃度，對於針鐵礦催化Fenton-like反應之能力，不是有很明顯的提升；但增加H2O2加入次數，會去趨緩Fe2+、Fe3+和HO‧自身的競爭作用，來維持H2O2一定的濃度，反而對於提高Fenton-like反應之能力是非常有效的；對於不同pH值上，在酸性的狀況時，針鐵礦可以解離出更多的鐵離子，與H2O2反應，並產生更多的HO‧，因此可以很明顯發現在pH=3時，對於催化Fenton-like反應之能力有非常大的提升；在針鐵礦含量多寡上，當針鐵礦含量越多，能分解出的鐵離子也越多，並且也會有更多針鐵礦的表面可以與H2O2反應，兩者皆可大幅提高Fenton-like反應之能力。若在使用合成針鐵礦來催化Fenton-like反應，去除人工食用色素此類污染物，可以參考本研究中參數相關設定，以有效評估並且預測人工食用色素相關污染物之可行性和效率。
;Artificial food colorants are chemically synthesized pigments that exhibit varying impacts on different types of soil. They are readily absorbed by acidic soils due to their large molecular size and ionic bonds. Consequently, soil composition also influences their adsorption levels. Literature has indicated the harmful effects of artificial food colorants on human health, including decreased fertility, malformed fetuses, and a potential carcinogenic impact. Previous studies have demonstrated the capability of natural iron oxide minerals in soil to catalyze Fenton-like oxidation, effectively treating various dissolved and non-dissolved pollutants. Hence, this research employs goethite to simulate natural iron oxide minerals in catalyzing peroxide to conduct Fenton-like reactions for removing pollutants such as artificial food colorants. By adjusting different parameters such as pH levels, goethite content, H2O2 concentration, and frequency of addition, this study focuses on using FD&C Blue No. 1 food colorant to explore the variations in its removal characteristics through this system.
Based on the results obtained, it was observed that increasing the concentration of H2O2 did not significantly enhance the ability of goethite to catalyze the Fenton-like reaction. However, increasing the frequency of H2O2 addition tended to mitigate the competitive interactions among Fe2+, Fe3+, and HO‧, thus maintaining a certain concentration of H2O2. This, in turn, proved to be highly effective in enhancing the capability of the Fenton-like reaction. Moreover, concerning different pH values, under acidic conditions, goethite demonstrated the ability to dissociate more iron ions, react with H2O2, and generate more HO‧. Therefore, it was notably evident that at pH=3, there was a substantial increase in the ability to catalyze the Fenton-like reaction. Regarding the quantity of goethite, higher content led to the release of a greater amount of iron ions available for reaction and provided more surface area for goethite-H2O2 interactions, both significantly enhancing the capability of the Fenton-like reaction. Hence, when utilizing synthetic goethite for catalyzing the Fenton-like reaction in removing artificial food colorant pollutants, referencing the parameter settings in this study can effectively evaluate and predict the feasibility and efficiency of eliminating pollutants associated with artificial food colorants. |
