以溶膠-凝膠法製備二氧化鈰摻雜錳及其特性研究

全球環保已是眾所皆知的重要議題，世界各地都打著綠化地球的概念來保護地球，但民生用品的需求及要求的增加，使得各種製造業的興起，製造業隨之蓬勃發展，而造成水污染及空氣污染的產生。為了改善人們的生活品質，已有許多研究學者專注於光觸媒以及光催化之特性研究及開發，以此提高光觸媒催化效率，降解染整工業所排放出的染料廢水。本研究以三嵌段兩性共聚物作為界面活性劑，Ce(NO3)3‧6H2O作為主體的前驅物，MnCl2‧4H2O為摻雜之前驅物，利用溶膠-凝膠法合成出二氧化鈰摻雜不同比例錳的試片，再分別以550 ℃、600 ℃與650 ℃進行煆燒，利用所製備之粉體進行光催化降解亞甲基藍以達到改善環境污染的目的，並藉由TGA、FTIR、XRD、SEM及TEM分析試片的微結構，並利用太陽光進行光催化，測定二氧化鈰摻雜錳的吸收率及降解效率。根據實驗結果得知600 ℃之CM10試片的晶粒最小為17.52 nm，而其降解效率為28.39 %；降解效率最好的為650 ℃之Pure CeO2試片，降解效率為46.44 %；因此摻雜Mn能有效抑制晶粒成長，卻不能在太陽光的波段下提高降解效率，但能有與Pure CeO2接近之降解效率，如600 ℃之CM01試片，其降解效率達到44.55 %。

關鍵字

光催化；氧化鈰；氧化錳；溶膠-凝膠

並列摘要

Global environmental protection is a well-known and important issue. The concept of greening the earth is used to protect the earth all over the world. However, the quality and demand for people's livelihood supplies have increased, which has led to the rise of various manufacturing industries, and the manufacturing industry has flourished. They cause water pollution and air pollution. In order to improve people's quality of life, many research scholars have focused on the research and development of photocatalyst and photocatalysis, in order to improve the catalytic efficiency of photocatalyst and degrade the dye wastewater which discharged from the dyeing and finishing industry. In this study, triblock copolymer was utilized as surfactant, Ce(NO3)3‧6H2O as precursor of the host, and MnCl2‧4H2O as precursor of doping. And then, Mn-doped cerium oxide was synthesized by sol-gel method as specimen. The calcination was carried out at 550, 600 and 650 ℃, respectively. The prepared powder was then used for photocatalytic degradation of methylene blue to improve environmental pollution. The characteristic of the specimen was analyzed by TGA, FTIR, XRD, SEM and TEM. Uv-visible light was used for photocatalysis degradation, determining the absorption rate and degradation efficiency of cerium oxide doped manganese. According to the experimental results, the minimum grain size of the CM10 at 600 ℃ is 17.52 nm, and the degradation efficiency is 28.39%. The best degradation efficiency is Pure CeO2 at 650 ℃, the degradation efficiency is 46.44%; therefore, doping Mn can effectively inhibit grain growth, but can’t improve the degradation efficiency in the visible light band, but can have degradation efficiency close to Pure CeO2, such as CM01 at 600 ℃, its degradation efficiency reaches 44.55 %