蒽醌驱动下的芬顿法和过硫酸盐活化法对罗丹明B降解特征的初步研究
发布时间:2018-07-18 08:56
【摘要】:本实验主要针对蒽醌类溶解有机质和模拟太阳光耦合驱动下的类Fenton法降解罗丹明B以及蒽醌类溶解有机质和模拟太阳光耦合驱动下过硫酸盐活化法降解罗丹明B的特征机理进行研究。通过过硫酸盐活化的数据分析可知,当蒽醌(AQS、AQDS、HQ)与Fe(Ⅲ)共同存在时,过硫酸盐活化程度最高,RhB降解速率也最快。不同蒽醌的活化程度依次是AQS最快,AQDS次之,HQ最慢,其中前二者反应体系下最终罗丹明B的降解率可达80%以上,HQ体系小于50%。当蒽醌浓度在一定范围内时,随着蒽醌浓度增加,罗丹明B的脱色率升高,当蒽醌浓度过高时,罗丹明B的脱色率反而呈下降趋势,在酸性和碱性条件下时,硫酸盐活化程度高,RhB脱色速率较快,中性条件下时脱色率最低。当在蒽醌参与条件下,无Fe(Ⅲ)时,通过过二硫酸钾浓度的增加,罗丹明B脱色率随之升高,但过量的过二硫酸钾反而会抑制降解率。当加入硫酸根自由基的淬灭剂甲醇和TBA时,反应被抑制,且甲醇的抑制作用明显,当甲醇浓度为10mmol/L时,抑制作用最强,当有Fe(Ⅲ)与Fe(Ⅱ)的促进剂盐酸羟胺参与时,反应被促进。通过以上的现象可知:使罗丹明B脱色的有效物质是过硫酸盐被活化后的硫酸根自由基。通过纤铁矿的微生物异化还原制备出了1#-5#五种铁氧化物,经过5种铁氧化物在pH=3和pH=4.1的条件下,研究蒽醌类物质参与下铁氧化物类Fenton光催化降解罗丹明B的机理。研究发现:1#-5#铁氧化物的类Fenton反应中蒽醌物质的参与是关键因素,pH值影响起主要作用,而铁氧化物的种类影响较微弱。pH=3时,光照与无光照条件下的降解率几乎相同,AQS和AQDS体系下罗丹明B的脱色率约可达80%左右,HQ下时,约可达50%左右。pH=4.1时,AQS和AQDS体系下,RhB降解率小于60%,HQ的几乎未发生降解。通过铁氧化物在不同条件下的降解特征知,蒽醌物质是反应的关键物质,无蒽醌参与时,RhB几乎不能被降解,不同蒽醌的活化程度依次是AQS最快,AQDS次之,HQ最慢。当蒽醌物质浓度在一定范围内增加时,随着浓度增加,降解速率随之增加。
[Abstract]:In this experiment, the degradation of Rhodamine B by antrone dissolved organic matter and simulated solar coupling driven by Fenton method, and degradation of Rhodamine B by anthraquinone dissolved organic matter and simulated solar coupling driven by persulfate activation were studied. Its characteristic mechanism was studied. According to the data analysis of persulfate activation, the degradation rate of RhB is the highest when the anthraquinone (AQS- AQDSHQ) and Fe (鈪,
本文编号:2131402
[Abstract]:In this experiment, the degradation of Rhodamine B by antrone dissolved organic matter and simulated solar coupling driven by Fenton method, and degradation of Rhodamine B by anthraquinone dissolved organic matter and simulated solar coupling driven by persulfate activation were studied. Its characteristic mechanism was studied. According to the data analysis of persulfate activation, the degradation rate of RhB is the highest when the anthraquinone (AQS- AQDSHQ) and Fe (鈪,
本文编号:2131402
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