SUSTAINABLE ACTIVATION OF PERACETIC ACID WITH MoS2 FOR DEGRADATION OF ACIDIC ORANGE 7
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摘要: 酸性橙7(AO7)是一种典型的阴离子偶氮染料,其对环境和人类健康的潜在危害已引起人们广泛关注。该研究采用二硫化钼(MoS2)活化过氧乙酸(PAA)降解AO7。结果表明,AO7在MoS2/PAA体系中的降解效率要远远超过MoS2/H2O2体系和MoS2/PI体系,当ρ(MoS2)0=0.4 g/L、c(PAA)0=0.4 mmol/L、初始pH为3.0时,AO7的降解率达到84.2%。此外,MoS2/H2O2体系能高效降解MO、ACE、DCF、SMX和TC等多种污染物。EPR和淬灭实验表明,MoS2/PAA体系产生的·OH、R-O·和1O2等是AO7降解的主要活性氧物种。紫外全波长扫描发现,AO7的偶氮键、芳香族片段(萘环和苯环)等在活性自由基的攻击下被快速破坏。进一步考察了初始pH、MoS2剂量、PAA浓度、共存水基质和天然水体对AO7降解的影响。在共存水基质实验中,Cl-、SO42-和HCO-3并不会影响AO7的去除,而腐殖酸(HA)则会抑制。在天然水体中,MoS2/PAA体系对AO7仍展现出较强的氧化性能(~60%)。本研究构建的MoS2/PAA体系在高效去除AO7领域具有广泛的应用前景并提供了新的见解。Abstract: Acidic orange 7(AO7) is a typical anionic azo dye, and has attracted widespread attention for its potential hazards to the environment and human health. In this study, molybdenum disulfide(MoS2) was used as an activator of peroxyacetic acid(PAA) for the degradation of AO7. The results indicated that the degradation efficiency of AO7 in the MoS2/PAA system was much higher than that in the MoS2/H2O2 system and MoS2/PI system. The degradation efficiency of AO7 reached 84.2% under the condition of ρ(MoS2)0=0.4 g/L, c(PAA)0=0.4 mmol/L, and initial pH=3.0. In addition, the MoS2/H2O2 system can efficiently degrade various pollutants such as MO, ACE, DCF, SMX, and TC. EPR and quenching experiments result indicated that ·OH, R-O·, and 1O2 generated by the MoS2/PAA system were the main reactive oxygen species for AO7 degradation. UV full wavelength scanning revealed that the azo bonds and aromatic fragments(naphthalene and benzene rings) of AO7 were rapidly disrupted under the attack of active free radicals. Further investigation was conducted on the effects of initial pH, MoS2 dosage, PAA concentration, coexisting water matrix on AO7 degradation. In the co-existing water matrix experiment, Cl-, SO42- and HCO-3 did not affect the removal of AO7, while humic acid(HA) inhibited it. In natural water bodies, the MoS2/PAA system still exhibits strong oxidation performance(up to 60%) towards AO7. Overall, this study provides new knowledge on the degradation of organic pollutants within the MoS2/PAA system.
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Key words:
- MoS2 /
- peracetic acid /
- Fenton-like /
- acidic orange 7
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