製備摻氮氧化鋅聚偏氟乙烯薄膜進行可見光催化之研究

Photocatalytic degradation of membrane fouling by using plasma-grafted PVDF membrane coated with nitrogen-doped ZnO

朱秉駿(Ping-Chun Chu)

指導教授 ： 游勝傑

中原大學/工學院/生物環境工程研究所/碩士(2015年)

https://doi.org/10.6840/CYCU.2015.00120

摘要

薄膜處理程序為現今廣泛利用的技術，然而其缺點為隨著操作時間越長，累積於薄膜表面的積垢物(fouling)便會導致薄膜通量下降及透膜壓力升上，影響出水水質並降低薄膜的使用壽命。文獻指出，藉由塗佈光觸媒奈米材料塗佈於薄膜上可有效提高薄膜親水性能，降低積垢物造成的影響。因此，本研究以PVDF薄膜經由低溫電漿改質，並以製備之摻氮氧化鋅塗佈於薄膜上，以改變薄膜的表面特性及利用光催化反應(photocatalysis)，減輕積垢物的影響並去除之。

於測試摻氮氧化鋅光催化效果實驗結果顯示，以1mL硝酸為氮源加入量製備之摻氮氧化鋅效果最好；添加劑量的實驗中，顯示摻氮氧化鋅加入量超過0.5g後光催化降解效率的提升趨於緩慢；於染料初始濃度不同的實驗中，顯示染料濃度越高，可見光穿透率就越低。將摻氮氧化鋅塗佈於薄膜上後，其光催化降解染料的效率明顯下降，但仍具有光催化的能力。

污染物阻塞實驗選擇以PVDF、0.25g、0.5g、1g塗佈量之摻氮氧化鋅薄膜進行，在置入褐藻酸的部份，未改質PVDF薄膜在操作最後仍為阻塞狀態，恢復率最高為塗佈0.5g摻氮氧化鋅薄膜，操作最後可達清水測試通量的96%；置入牛血清蛋白的部份，未改質PVDF及塗佈0.25g摻氮氧化鋅薄膜在操作最後仍為阻塞狀態，恢復率最高為塗佈1g摻氮氧化鋅薄膜，操作最後可達清水測試通量的85%；置入活性污泥的部份，摻氮氧化鋅於物理潤洗階段恢復率優於未改質PVDF薄膜，並且在照光階段恢復至趨近初始通量。顯示摻氮氧化鋅在去除不同類的積垢物上具有一定的效果，塗佈0.5g、1g摻氮氧化鋅薄膜於不同污染物累積照光60分鐘後均可達到超過80%以上的通量恢復率。

關鍵字

ZnO/PVDF薄膜 ； 薄膜積垢 ； 光催化反應 ； 親水性 ； 氧化鋅

並列摘要

Nowadays,treatment program of membrane is the choice for industrial, municipal water and wastewater treatment with wide using, Permanent flux decline, loss of product quality, affecting water quality, and reduce the life of film are the main problem because of membrane fouling accumulation with long operating time.
Literature shows that nano-materials with photocatalyst coating and coat on membrane surface can enhance hydrophilicity and reduce effect of fouling. In this study, PVDF membrane was reformed by low-temperature plasma modification and coated with N-doped ZnO on PVDF membrane. Change characteristics of membrane surface and Minimize fouling effects and remove them.
In experiment of adding dose, shows that photocatalytic degradation of efficiency tend to be slower after add more than 0.5g of N-doped ZnO; In experiments of different Reactive Black 5(RB5) initial concentrations shows that RB5 concentration of is higher, visible light transmittance is lower. After N-doped ZnO coating on the membrane, the efficiency of photocatalytic degradation RB5 obviously reduced, but still has capacity of photocatalysis.
In the experiment of the simulation of pollutant membrane fouling that chooses amount of coating for 0.25g, 0.5g, 1g with N-doped ZnO membrane to operate. In alginic acid placing, unmodified PVDF films still in fouling state in the end, the highest recovery rate is coated 0.5g of N-doped ZnO membrane that can reach to 96% of water flux test. In bovine serum albumin placing, unmodified PVDF and coating with membrane of 0.25g of N-doped ZnO still in fouling state in the end, the highest recovery rate is coated 1G of N-doped ZnO membrane that can reach to 85% of water flux test. In the activated sludge test, recovery rate in Physical cleaning stage of all the N-doped ZnO flux are better than PVDF membrane and recover to the initial flux in illumination satge. It shows that N-doped ZnO has certain efficiency on different kinds of antifouling, the flux recovery of N-doped ZnO membrane in different pollutants accumulated can reach more than 80% after light for 60 minutes.

並列關鍵字

Photocatalysis ； ZnO ； Hydrophilic ； antifouling ； ZnO/PVDF membrane

參考文獻

42. 呂紹仲　(2012)，製備PVDF接枝丙烯酸二氧化鈦薄膜，碩士論文，中原大學。

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