蒽醌驅動下的芬頓法和過硫酸鹽活化法對羅丹明B降解特征的初步研究
發(fā)布時間:2018-07-18 08:56
【摘要】:本實驗主要針對蒽醌類溶解有機質和模擬太陽光耦合驅動下的類Fenton法降解羅丹明B以及蒽醌類溶解有機質和模擬太陽光耦合驅動下過硫酸鹽活化法降解羅丹明B的特征機理進行研究。通過過硫酸鹽活化的數(shù)據(jù)分析可知,當蒽醌(AQS、AQDS、HQ)與Fe(Ⅲ)共同存在時,過硫酸鹽活化程度最高,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,其中前二者反應體系下最終羅丹明B的降解率可達80%以上,HQ體系小于50%。當蒽醌濃度在一定范圍內(nèi)時,隨著蒽醌濃度增加,羅丹明B的脫色率升高,當蒽醌濃度過高時,羅丹明B的脫色率反而呈下降趨勢,在酸性和堿性條件下時,硫酸鹽活化程度高,RhB脫色速率較快,中性條件下時脫色率最低。當在蒽醌參與條件下,無Fe(Ⅲ)時,通過過二硫酸鉀濃度的增加,羅丹明B脫色率隨之升高,但過量的過二硫酸鉀反而會抑制降解率。當加入硫酸根自由基的淬滅劑甲醇和TBA時,反應被抑制,且甲醇的抑制作用明顯,當甲醇濃度為10mmol/L時,抑制作用最強,當有Fe(Ⅲ)與Fe(Ⅱ)的促進劑鹽酸羥胺參與時,反應被促進。通過以上的現(xiàn)象可知:使羅丹明B脫色的有效物質是過硫酸鹽被活化后的硫酸根自由基。通過纖鐵礦的微生物異化還原制備出了1#-5#五種鐵氧化物,經(jīng)過5種鐵氧化物在pH=3和pH=4.1的條件下,研究蒽醌類物質參與下鐵氧化物類Fenton光催化降解羅丹明B的機理。研究發(fā)現(xiàn):1#-5#鐵氧化物的類Fenton反應中蒽醌物質的參與是關鍵因素,pH值影響起主要作用,而鐵氧化物的種類影響較微弱。pH=3時,光照與無光照條件下的降解率幾乎相同,AQS和AQDS體系下羅丹明B的脫色率約可達80%左右,HQ下時,約可達50%左右。pH=4.1時,AQS和AQDS體系下,RhB降解率小于60%,HQ的幾乎未發(fā)生降解。通過鐵氧化物在不同條件下的降解特征知,蒽醌物質是反應的關鍵物質,無蒽醌參與時,RhB幾乎不能被降解,不同蒽醌的活化程度依次是AQS最快,AQDS次之,HQ最慢。當蒽醌物質濃度在一定范圍內(nèi)增加時,隨著濃度增加,降解速率隨之增加。
[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,
本文編號: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,
本文編號:2131402
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