本論文研究以磁性奈米複合物作為光觸媒的合成以及應用於光催化降解的特性做深入的探討，本研究運用共沉澱反應(Co-precipitation reaction)的原理，成功地利用簡單且室溫下即可進行的界面反應(Interfacial reaction)合成出鐵酸錫(tin ferrite, TF)奈米顆粒，同時也藉由氧化鋅奈米點的修飾來強化鐵酸錫的吸附能力以進一步提高光降解的效率。本實驗使用的界面合成法透過兩溶劑—水跟正己烷—不互溶的特性製造出一界面供予共沉澱反應的平台，使用的前驅溶液是溶解了硝酸鐵跟氯化亞錫之酒精與正己烷的混合溶液。硝酸鐵跟氯化亞錫係依鐵酸錫的分子式以特定的化學劑量比溶於前驅溶液裡，在維持該特定的化學劑量比的前提下，尚可藉由調整反應物的莫耳數以調控反應的速率並進一步改變合成的鐵酸錫奈米顆粒尺寸；依循著反應物莫耳數增加而顆粒尺寸變大的正相關關係，其光學特性、物性跟磁性也會有所改變。本實驗進一步以氧化鋅奈米點來修飾鐵酸錫，將鐵酸錫投入醋酸鋅的酒精溶液裡隔水加熱進行沉積反應，後以磁性分離的方法分離生成物跟醋酸鋅酒精溶液，再將該合成物以300OC退火後烘乾備用，並將該生成物命名為ZnO@SnFe2O4 (ZTF)。光降解部分以實驗後得出兼具不錯的磁性與光催化效率的編號三號的鐵酸錫顆粒作為材料，探討其動力學跟吸附模型，以及藉由氧化鋅奈米點改質前後之差異。
實驗所合成之磁性奈米複合物使用X光繞射儀和掃描式電子顯微鏡分析其晶體結構、表面形貌跟粒子散佈情形，使用表面吸附儀測量改質後的鐵酸錫比表面積與孔洞大小，使用超導量子干涉震動磁量儀求得磁性與顆粒尺寸的關係，以能量色散分析確認是否合成的鐵酸錫為單一相與改質用的氧化鋅奈米點的分布狀況，最後以傅立葉轉換紅外線光譜分析產物的分子基團；光學特性部分，使用螢光光譜儀所測得的螢光峰值藍移來說明其顆粒尺寸變化，使用可見光/紫外光光譜儀觀察鐵酸錫的能隙變化，亦透過該儀器所量測的可見光或紫外光降解亞甲基藍的吸收圖譜來測試磁性奈米複合結構光催化分解汙染物之能力。

SnFe2O4 nanocrystals (NCs) are new class of photocatalysts with magnetically recyclable behavior that can be operated under visible light irradiation. In this study, a surfactant-free and simple carrier solvent-assisted co-precipitation reaction was employed to synthesize size-controllable SnFe2O4 NCs through the interfacial reaction between two immiscible aqueous systems. Furthermore, the deposition of ZnO on SnFe2O4 NCs, named ZnO@SnFe2O4 NCs, was investigated and the involving heterostructures was presented through detailed XRD and SEM characterizations. Our results demonstrated the excellent photocatalytic activity of these heterostructures on degrading methylene blue (MB) dyes. With the add of 40 mg catalysts in 10 ml MB solutions, an intriguing efficiency of dye removal with wide range of concentrations was demonstrated during 50 min under the irradiation of light of 420 nm. The rapid degradation of MB could be attributed to the effective absorption of visible light and well separation of h+-e- pairs, as well as the prominent adsorption of MB on catalyst surfaces.

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