近年來，隨著科技日新月異、工業蓬勃發展，全世界對於用水的需求量大增，加上醫療進步帶來的人均壽命延長，人口過剩水資源的分配有限，如何有效處理廢水成為這個世紀備受矚目的議題。本研究結合薄膜過濾和光觸媒催化技術，形成光觸媒薄膜反應器(Photocatalytic Membrane Reactor, PMR)，在減少觸媒反應後易流失問題的同時亦能降低因積垢帶來的薄膜壽命下降等現象。
本實驗利用溶劑熱法合成不同比例摻雜鈷之MIL-88B(Fe)，改善光生電子電洞對再結合速率快、提高光吸收等問題，其中5CoMIL-88B(Fe)顯示最好的光催化效率，此外再添加單硫酸氫鉀複合鹽(peroxymonosulfate, PMS)作為氧化劑輔助光催化進行，可於光源照射下達90%以上的苯酚去除率。由於粉體觸媒實驗後回收較為困難，因此將光觸媒材料以塗佈、長晶等方式合成於氧化鋁基板上，形成光觸媒薄膜，依照合成方式分別命名為PVA-catalyst@Al2O3、MRS-catalyst@Al2O3，於PMR系統中以不同條件下對苯酚的光照去除進行實驗，由反應結果得知，隨著添加PMS濃度的提升，MRS-5CoMIL-88B(Fe)@Al2O3於光照下對苯酚的去除率明顯提升，同時提高了滲透通量，證明此系統在光照去除苯酚的同時仍能有效降低薄膜結垢。此外，由於高分子塗佈而在氧化鋁基材表面形成緻密的光觸媒薄膜卻也造成氧化鋁基板孔隙被堵塞，相較之下，由長晶法均勻生長於基材孔隙間的MRS-catalyst@Al2O3的滲透通量將近為PVA-catalyst@Al2O3的11~15倍。
經反應過後，薄膜表面之光觸媒於結構上雖有些許變化，但仍維持原形貌，材料中之活性位點元素未有明顯被破壞，經10次PMR重複性試驗後仍能達到90%左右的苯酚去除率，證明此系統對於有機廢水的光催化降解具有良好的長效、穩定性。

In recent years, with the rapid development of science and technology, the demand for clean water has greatly increased around the world. However, overpopulation due to evolution of medical resulting the competition for water. How to treat wastewater effectively has become a challenge in this century. This study combines membrane filtration and photocatalyst technology to form a photocatalytic membrane reactor (Photocatalytic Membrane Reactor, PMR), which could not only avoid the loss of catalyst but also inhibit the membrane fouling.
In this experiment, MIL-88B(Fe) doped with different cobalt was synthesized through solvothermal. Among them, 5CoMIL-88B(Fe) showed the best photocatalytic efficiency that mean optimum cobalt doping with potential to improve electron-hole recombination rate and light absorption of photocatalyst. In addition, Oxone (peroxymonosulfate, PMS) is added as an oxidant to assist photocatalysis, which can achieve more than 90% phenol removal under light irradiation. Since it is difficult to recycle powder after reaction, the photocatalyst was synthesized on the alumina substrate through coating, reactive seeding. The membranes formed were been named PVA-catalyst@Al2O3 and MRS-catalyst@Al2O3, respectively. The photocatalytic phenol removal conducted under several conditions. Results show that removal efficiency through MRS-5CoMIL-88B(Fe)@Al2O3 enhanced with concentration of PMS increasing. At the same time, the permeance flux were 11~15 times higher compared to PVA-5CoMIL-88B(Fe)@Al2O3 due to homogeneous growth of photocatalyst in the pores of Al2O3.
After the reaction, although the structure of the photocatalyst on the membrane surface has changed slightly, but it still maintains the morphology. Moreover, the active site of material remained. After 10 times PMR repeatability tests, it still show a high phenol removal about 90%. The results proved that the PMR system in this work has a long-term, stable potential for the photocatalytic degradation of organic wastewater.

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