Liu Qinyao, Qian Kun, Qi Jinxu, Li Chenru, Yao Chen, Song Wei, Wang Yihong
School of Chemistry and Chemical Engineering, Southeast University Nanjing 211189 P. R. China
RSC Adv. 2018 Mar 8;8(18):9741-9748. doi: 10.1039/c8ra00240a. eCollection 2018 Mar 5.
Reducing the quantity of sludge produced in Fenton reactions can be partly achieved by improving their efficiency. This paper firstly studies the effect of uniform deceleration feeding (ferrous iron and hydrogen peroxide) on the efficiency of a Fenton reaction by measuring the yield of hydroxyl radicals (˙OH) and chemical oxygen demand (COD) removal rate. The dynamic behavior of ˙OH was also investigated. The results indicated that uniform deceleration feeding was the best feeding method compared with one-time feeding and uniform feeding methods when the same amount of Fenton reagents and the same reaction times were used. Besides, it was found the COD removal rate reached 79.3% when this method was applied to degrade 2-(-hydroxyethyl)benzimidazole (HEBZ); this COD removal rate is larger than those when the other two modes were used (they reached 60.7% and 72.1%, respectively). The degradation pathway of HEBZ was determined using PL, UV-vis, FTIR, HPLC and GC-MS. Ultimately, HEBZ was decomposed into three small molecules (2-hydroxypropylamine, oxalic acid, and 2-hydroxypropamide). This research is of great significance for the application of Fenton reactions in wastewater treatment.
通过提高芬顿反应的效率可以部分减少其产生的污泥量。本文首先通过测量羟基自由基（˙OH）的产率和化学需氧量（COD）去除率，研究了均匀减速进料（亚铁离子和过氧化氢）对芬顿反应效率的影响。还研究了˙OH的动态行为。结果表明，在使用相同量的芬顿试剂和相同反应时间的情况下，与一次性进料和均匀进料方法相比，均匀减速进料是最佳的进料方法。此外，发现当该方法用于降解2-（-羟乙基）苯并咪唑（HEBZ）时，COD去除率达到79.3%；该COD去除率高于使用其他两种模式时的去除率（分别达到60.7%和72.1%）。使用PL、UV-vis、FTIR、HPLC和GC-MS确定了HEBZ的降解途径。最终，HEBZ分解为三个小分子（2-羟丙胺、草酸和2-羟丙酰胺）。本研究对芬顿反应在废水处理中的应用具有重要意义。
