WS_(2)强化芬顿体系降解罗丹明B废水的研究

Study on Enhancement of Fenton System by WS_(2)for the Degradation of Rhodamine B Wastewater

传统芬顿存在双氧水利用率低、芬顿试剂消耗量大、产生铁泥量大等问题,其主要原因在于反应过程中Fe^(2+)/Fe^(3+)离子循环不畅。本文将硫化钨(WS_(2))引入传统芬顿体系,构建了一种WS_(2)强化的高效芬顿体系用于罗丹明B(RhB)降解,并对影响降解反应的因素进行了系统考察,得到了优选的反应条件。在优选反应条件下,WS_(2)强化的芬顿体系中RhB的降解率达到99.5%,较传统芬顿有明显提高。捕获实验发现·OH是RhB降解的主要活性物种,WS_(2)强化的芬顿体系能产生更多的·OH,归因于WS_(2)能将Fe^(3+)还原为Fe^(2+),促进Fe^(2+)/Fe^(3+)离子循环,保证了体系中Fe^(2+)浓度。此外,开展了循环实验,WS_(2)循环5次后,RhB的降解率仍高于98%。本研究为芬顿法处理印染废水提供了一种新的思路。

Traditional Fenton technology has some drawbacks,such as low hydrogen peroxide utilization rate,large Fenton reagent consumption and large amount of iron sludge,which are mainly due to the poor ions circulation of Fe^(2+)/Fe^(3+)in the reaction process.In this paper,tungsten sulfide(WS_(2))was introduced into the traditional Fenton system,and a WS_(2)-strengthened efficient Fenton system was constructed for the degradation of Rhodamine B(RhB).The factors affecting the degradation reaction were systematically investigated,and the optimal reaction conditions were obtained.Under the optimal reaction conditions,the degradation rate of RhB in WS_(2)-enhanced Fenton system reached 99.5%,which was significantly higher than that of traditional Fenton system.The capture experiment found that·OH is the main active species for RhB degradation,and WS_(2)-enhanced Fenton system can produce more·OH,which is attributed to the fact that WS_(2)can reduce Fe^(3+)to Fe^(2+),and promote Fe^(2+)/Fe^(3+)ions cycling,thus ensuring the Fe^(2+)concentration in the system.In addition,the cyclic experiment was carried out,and the degradation rate of RhB was still higher than 98%after 5 cycles of WS_(2).This study provides a new method for treating dyeing wastewater by Fenton process.