光觸媒知識

 

1、光觸媒歷史
1968年當時東京大學的研究生滕島昭偶然的情況下發現了光觸媒。
1999年由于納米技術得到了突破性進展,光觸媒終于正式登上了國際研究舞臺。
2001年,光觸媒產品全面介入家庭日常生活,并在短短的半年時間,迅速席卷歐美及東南亞發達國家和地區,成為家庭主要消費產品之一,而且奇跡般的以年平均4.6%遞增。光觸媒已經成為發達國家老幼皆知的環保代名詞。并于年末,首次應用于美國空間站的空氣凈化。
2、光觸媒是什么?
光觸媒[Photocatalyst]是光[Photo=Light]+觸媒(催化劑)[catalyst]的合成詞。光觸媒是一種以納米級二氧化鈦為代表的具有光催化功能的光半導體材料的總稱,是當前國際上治理室內環境污染的最理想材料。
    光觸媒在光的照射下,會產生類似光合作用的光催化反應,產生出氧化能力極強的自由氫氧基和活性氧,具有很強的光氧化還原功能,可氧化分解各種有機化合物和部分無機物,能破壞細菌的細胞膜和固化病毒的蛋白質,可殺滅細菌和分解有機污染物,把有機污染物分解成無污染的水(H2O)和二氧化碳(CO2),因而具有極強的殺菌、除臭、防霉、防污自潔、凈化空氣功能。
3、光觸媒反應機理是什么?
   二氧化鈦見光會產生正、負電子,正電子與空氣當中的水分子結合產生氫氧自由基,實踐證明,氫氧自由基具有強大的氧化分解能力,它能分解幾乎所有的有機化合物和一部分的無機物,將它們分解成無害的二氧化碳及其他物質,而負電子與空氣當中的氧結合會產生活性氧,也就是超級氧化離子,超級氧化離子也具有很強的氧化分解能力,它可以破壞細菌、霉菌這些有機物的細胞膜,固化病毒的蛋白質,在殺菌的同時還能分解細菌尸體上釋放出的有害復合物。
4、光觸媒有什么樣的作用?光觸媒作為一種新興的空氣凈化產品,主要有以下功能 :
1.     空氣凈化功能:對甲醛、苯、氨氣、二氧化硫、一氧化碳、氮氧化物等影響從類身體健康的有害有機物起到凈化作用。
2.     殺菌功能:對大腸桿菌、黃色葡萄球菌等具有殺菌功效。在殺菌的同時還能分解由細菌死體上釋放出的有害復合物。
3.     除臭功能:對香煙臭、廁所臭、垃圾臭、動物臭等具有除臭功效。
4.     防污功能:防止油污、灰塵等產生。對浴室中的霉菌、水銹、便器的黃堿及鐵銹和涂染面褪色等現象同樣具有防止其產生的功效。

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