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  1. �

    二氧化氯

    2024.05.17 15:17 2320次

    二氧(yǎng)化氯

    "二氧化氯(lǜ),是一种无机化合(hé)物,化学式为ClO2,常(cháng)温常压下是一种黄绿(lǜ)色到橙(chéng)黄色气(qì)体。二氧化氯(lǜ)具有漂白性,主要用于(yú)纸浆和纸、纤维(wéi)、小麦面(miàn)粉(fěn)、淀粉的漂白,油脂、蜂蜡等的精制和漂白,另外,由于其消毒能(néng)力较强,常作为饮用水消(xiāo)毒杀菌(jun1)剂替代传统(tǒng)的(de)液氯消毒(dú)。

    二氧化氯遇热水(shuǐ)则(zé)分解成次氯酸、氯气、氧气(qì),受光(guāng)也(yě)易分解(jiě),其溶液于冷暗处相对稳定。二氧化氯能与(yǔ)许多化学物质(zhì)发生爆炸性反应。对热、震动(dòng)、撞击和摩擦相当敏感,极易分解发生(shēng)爆炸。受热和受(shòu)光照或遇有机物等能促进氧(yǎng)化作用(yòng)的物质时,能促进分(fèn)解并易引起爆炸。若用空气、二氧化碳(tàn)、氮气等惰性气(qì)体稀释时(shí),爆炸性则降低。属强氧化剂,其(qí)有效氯是氯的2.6倍。与很多物质(zhì)都能发(fā)生剧烈反(fǎn)应。腐蚀性很强。

    二(èr)氧化氯具有杀菌(jun1)、漂白、除臭、消毒、保鲜的功能。主要是因为二(èr)氧化氯(lǜ)具有氧化(huà)作(zuò)用,二氧化(huà)氯分子的电子(zǐ)结构呈不饱和状态(tài),外层共有19个电子,具有(yǒu)强烈的氧化性,主要(yào)是对富有电子(或供电子)的原子基团(如含巯基的酶和硫化物(wù),氯(lǜ)化物)进行攻(gōng)击,强行掠夺电子,使之(zhī)成为失去活性和改变性质的物(wù)质(zhì)。

    1、杀(shā)菌机(jī)理

    二氧化氯对细胞壁(bì)有较强的(de)吸附(fù)和穿透能力,放(fàng)出(chū)原子(zǐ)氧将细胞内(nèi)的含(hán)巯基的酶氧化起(qǐ)到杀(shā)菌作用。

    2、漂(piāo)白作用

    二(èr)氧化(huà)氯的漂白是通(tōng)过放出原子(zǐ)氧和产生次(cì)氯(lǜ)酸盐而达到分解色素的目的。用(yòng)它做漂白剂代替氯气、氯酸盐等,可阻止并(bìng)避免与纤(xiān)维发(fā)生氧化而降低纤维强度,因而效(xiào)果更全(quán)面。

    3、除臭作(zuò)用(yòng)

    二(èr)氧化氯的除(chú)臭是因为它能与异(yì)味(wèi)物质(如H2S、-SOH、-NH2等)发生脱水反应(yīng)并使(shǐ)异味物质迅速氧化(huà)转(zhuǎn)化(huà)为其他(tā)物质。而且它能阻(zǔ)止蛋氨酸(suān)分解成乙烯,也能(néng)破坏已(yǐ)形(xíng)成(chéng)的乙烯,从而延缓腐烂(làn),同时杀(shā)死微生物而(ér)不与脂肪酸反应并不破坏食(shí)品结构。

    二氧化(huà)氯具有强氧化性,空气中的体积浓(nóng)度超过10%便有爆炸性,但其水溶液却是十分安全(quán)的(水中含(hán)量超过30%易爆炸)。它能与许多化学物质发生(shēng)爆(bào)炸性反应,对受热、震动、撞击(jī)、摩(mó)擦等相当(dāng)敏感,极易分解发(fā)生爆炸(zhà)。"


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