引用本文:
范星, 唐玉朝, 姚顺顺. 紫外-活性炭协同活化过硫酸氢钾对罗丹明B的降解[J]. 环境化学, 2018, 37(12): 2711-2720
FAN Xing, TANG Yuchao, YAO Shunshun. Degradation of Rhodamine B by peroxymonosulfate synergistically activated by UV/activated carbon[J]. Environmental Chemistry, 2018, 37(12): 2711-2720

紫外-活性炭协同活化过硫酸氢钾对罗丹明B的降解
范星, 唐玉朝, 姚顺顺
安徽建筑大学, 水污染控制与废水资源化安徽省重点实验室, 合肥, 230601
摘要:
利用紫外光(UV)和活性炭(AC)协同活化过硫酸氢钾(PMS)产生硫酸根自由基(SO4)对染料进行降解.以罗丹明B(RhB)作为目标污染物,考察了PMS浓度、AC用量、废水初始pH等因素对体系降解RhB的影响.实验表明,UV-AC体系能有效活化PMS.AC用量0.5 g· L-1,PMS浓度为2.0 mmol· L-1时,10 mg· L-1RhB的降解率在5 min达到89%,RhB的降解率随着初始PMS浓度和AC的用量增加而增大,但超过一定量时,对降解的促进就不明显.降解反应遵循准一级动力学.自由基清除的实验证明了硫酸根自由基(SO4)是主要的活性自由基,羟基自由基(HO·)也起到一定的作用,同时证明UV对PMS活化的贡献大于AC.通过紫外可见光谱和FT-IR光谱分析,初步推断RhB分子降解主要是由于共轭结构裂解和N-位脱乙基等作用.五次循环实验后RhB的脱色率仍能达到85%证明了降解体系的稳定性.
关键词:    紫外光    活性炭    过硫酸氢钾    罗丹明B    硫酸根自由基   
Degradation of Rhodamine B by peroxymonosulfate synergistically activated by UV/activated carbon
FAN Xing, TANG Yuchao, YAO Shunshun
Anhui Jianzhu University, Key Laboratory of Anhui Province of Water Pollution Control and Wastewater Reuse, Hefei, 230601, China
Abstract:
Synergistic activation of peroxymonosulfate (PMS) by ultraviolet (UV) and activated carbon (AC) produces sulfate radicals (SO4) to degrade dyes. Rhodamine B (RhB) was used as a target pollutant. The effects of PMS concentration, AC dosage, and initial pH of the wastewater on the degradation of RhB were investigated. Experiments showed that UV/AC combination effectively activated PMS. When the AC was dosage 0.5 g·L-1, PMS concentration 2.0 mmol·L-1, the degradation rate of 10 mg·L-1RhB reached 89% in 5 minutes.The degradation rate increased with the increase of initial PMS concentration and AC consumption. But when it exceeded a certain amount, the promotion of degradation was not obvious. The degradation reaction followed Quasi-first-order kinetics.Free radical scavenging experiment proved that sulfate radical (SO4) was the main active radical, and hydroxyl radical (HO·) also played a certain role. At the same time, it was proved that the contribution of UV to PMS activation was greater than AC. Through UV-visible spectroscopy and FT-IR spectroscopy, it was preliminarily inferred that the degradation of RhB molecules was mainly due to the effects of conjugated structure cleavage and N-position deethylation. After five cycles of experiments, the decolorization rate of RhB still reached 85%, which proved the stability of the degradation system.
Key words:    UV light    activated carbon    peroxymonosulfate    Rhodamine B    sulfate radical   
收稿日期: 2018-05-20
基金项目: 安徽省教育厅自然科学重点项目(KJ2015A109),住建部科学技术项目(2016-K4-077)和安徽省重点研究与开发计划(1704a0902006)资助.
唐玉朝,Tel:13856011459,E-mail:tangyc@ahjzu.edu.cn
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