回收廢螢光粉中鑭系元素並摻雜二氧化鈦製成光催化薄膜

Preparation of photocatalytic membrane by doping titanium dioxide with waste fluorescent powder of lanthanum

郭思妤(Szu-Yu Kuo)

指導教授 ： 游勝傑 ； 王雅玢

中原大學/工學院/生物環境工程研究所/碩士(2016年)

https://doi.org/10.6840/cycu201600477

摘要

本研究利用酸浸法將廢螢光粉中的稀土金屬酸浸出來，並將其鑭金屬摻雜二氧化鈦，此摻雜可降低二氧化鈦的能隙，使得光源可以從紫外光照射改成可見光照射，能有效降低能耗的問題。薄膜處理程序為現今廣泛利用的技術，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。本研究PVDF薄膜經由低溫電漿改質，並以製備之鑭摻雜二氧化鈦(La-TiO2)塗佈於薄膜上，以改變薄膜的表面特性及利用光催化反應，減輕積垢物的影響並去除之。
於酸浸實驗結果顯示，以固液比1:5及5M硝酸對鑭的溶出效果最好，並以1M HNO3→5M HNO3→5M HCl 個酸浸6小時所得到的鑭含量最多。光催化反應實驗結果顯示，以1wt%鑭添加劑量效果最好，添加劑量的實驗中，顯示La-TiO2加入量超過3wt%光催化降解效率趨於緩慢；於測試不同光源的實驗中，顯示藍光效果最好，並測試其光催化劑重複性，結果顯示，可重複高達11次。
將1wt%La-TiO2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。La-TiO2/PVDF薄膜具有親水性但也導致透模壓力上升。

關鍵字

光催化反應 ； La-TiO2 ； 親水性 ； La-TiO2/PVDF薄膜

並列摘要

In this study, the waste fluorescence powder used acid leaching to rare earth metal leach out and doped with titanium dioxide (TiO2). This reduced the TiO2 energy gap, making the light source can be changed to visible light from ultraviolet light, which can effectively reduce energy problem. Membrane treatment procedure for the widespread use of the current technology. Literature indicated by photocatalyst coating material was applied on the membrane hydrophilic, it could effectively improve performance and reduced the impact of fouling materials. In this study, the modified PVDF membrane by low temperature plasma and preparation of lanthanum-doped titanium dioxide coated on it. The modified membrane surface properties and photocatalytic reaction which reduced the fouling material and eliminate it.
The results showed that in acid leaching, use 5M nitric acid and solid-liquid ratio is 1: 5；1M HNO3 → 5M HNO3 → 5M HCl combination leaching 6 hours can obtained better lanthanum content. Photocatalytic reaction results showed that the amount of additive with 1wt% lanthanum had best additive amount of experiments. It showed lanthanum-doped titanium dioxide the amount exceeds 3wt%, the photocatalytic degradation efficiency tends to be slow. Experimental test different light sources the display blue light was best, and tested for their photocatalyst repeatability results show times can be repeated up to 11 times.
One wt% La-TiO2 coated on the membrane, its photocatalytic degradation efficiency of the dye decreased, but still has the ability of photocatalytic. La-TiO2/PVDF membrane is hydrophilic but it lead to increased pressure through the mold.

並列關鍵字

Photocatalytic reaction, ； La-TiO2 ； hydrophilic ； La-TiO2 / PVDF membrane

參考文獻

42.劉浩 (2014) 利用摻氮二氧化鈦改質聚偏氟乙烯薄膜，中原大學碩士

29.許勝翔 (2007) 電漿疏水化表面改質技術應用在彩色濾光片噴墨印刷

41.江慕楓 (2015) 以具分散反萃取相支撐式液態薄膜分離並回收廢螢光

43.朱秉駿 (2015) 製備摻氮氧化鋅聚偏氟乙烯薄膜進行可見光催化之研

36.S. Yuan, Q. Sheng, J. Zhang, F. Chen, M. Anpo, Q.