摘要: 二氧化氯具有強氧化性、不穩定性和消毒性，其氧化能力是次氯酸的9倍多，是氯的2.6倍。本文在生產和制備二氧化氯及穩定性二氧化氯的基礎上，用分光光度法測定反應后酸性紅染料的含量，從而計算二氧化氯對酸性紅染料的脫色率。研究反應溫度、pH值、攪拌速度、二氧化氯用量、酸性紅染料起始濃度、反應時間對酸性紅染料的脫色效果。實驗結果表明：二氧化氯對酸性紅染料的脫色率在一定條件下能達到95%以上，反應溫度、攪拌速度、酸性紅染料起始濃度對脫色率影響不大，反應時間也很快，5分鐘基本上完全反應，在酸性條件下對脫色率沒什么影響，但在堿性條件下pH值越大脫色率越低。二氧化氯對酸性紅染料脫色的較佳條件：反應溫度25℃,反應時間10min，轉速250r/min，pH=6，酸性紅染料與二氧化氯反應的摩爾比為1：3。
關鍵詞： 二氧化氯； 酸性紅染料； 脫色率； 分光光度法
Study on the Decolorization of Acid Red
Abstract: Chlorine dioxide has strong property of oxidation, the instability and the disinfection, its oxidized ability is more than 9 time of hypochlorous, and is 2.6 times of chlorine. This article is based on the production and the preparation of chlorine dioxide and stable chlorine dioxide, the content of the acid red was after reaction determined by Spectrophotometric methods, thus decolorization rate of acid red was calculated with chlorine dioxide. Then the decolorization effect of the acid red by reaction temperature, pH, mixing speed, the amount of chlorine dioxide, concentration of acid red, reaction time were studied. The experimental result indicated that, the decolorization rate can achieve above 95% by chlorine dioxide under the certain condition. The reaction temperature, the mixing speed, and concentration of the acid red have no evident influence to the decolorization rate. The reaction is very quick. The reaction would be completed within 5 minutes, so it has no influence to decolorization rate under acidic condition, but under the alkalinity condition, the larger pH is , the lower decolorization rate is. So the best condition were the followings: reaction temperature is 25℃, reaction time is 10min, rotational speed is 250r/min, pH is 6, the ratio of the acid red and a chlorine dioxide is 1: 3.
