氮掺杂碳纳米管活化过一硫酸盐降解酸性橙AO7

发布时间：2018-05-08 02:41

本文选题：氮掺杂碳纳米管 + 过一硫酸盐　；参考：《中国环境科学》2017年07期

【摘要】：采用氮掺杂多壁碳纳米管(N-CNT)作为固体活化剂,活化过一硫酸盐(PMS)氧化降解偶氮染料酸性橙7(AO7).结果表明,N-CNT活化PMS降解AO7比颗粒活性炭(GAC)效果好,N-CNT投加量为400mg/L、n(PMS)/n(AO7)为40/1时,反应60min可使AO7的脱色率达到99%;研究了N-CNT活化PMS降解AO7的降解机制,发现N-CNT活化PMS产生的自由基主要是SO4-·,活化场所在N-CNT的表面.在N-CNT/PMS体系中,初始pH值对降解AO7有较大的影响,当pH=3.0时AO7降解效果最好;Cl~-、SO_4~(2-)和CO_3~(2-)离子对AO7降解都存在一定促进作用,离子浓度越高,AO7降解速率越快.紫外可见光谱、TOC分析表明AO7分子中偶氮键及萘环结构均被破坏,并进一步矿化为CO_2和H_2O.
[Abstract]:Nitrogen-doped multi-walled carbon nanotubes (N-CNT) were used as solid activators to oxidize and degrade azo dye acid orange 7AO7 by activating PMSs. The results showed that N-CNT activated PMS could degrade AO7 better than granular activated carbon (GAC). When the dosage of N-CNT was 40 / 1, the decolorization rate of AO7 reached 99% when the dosage of NCNT was 400 mg / L, and the degradation mechanism of AO7 by N-CNT activated PMS was studied. It was found that the free radical produced by PMS activated by N-CNT was mainly so _ 4-, and the activation site was on the surface of N-CNT. In N-CNT/PMS system, the initial pH value has a great effect on the degradation of AO7. When pH=3.0 is used, the degradation rate of AO7 is the best. The degradation rate of AO7 is faster with the increase of ion concentration. UV-Vis spectra showed that the azo bonds and naphthalene ring structures in AO7 were destroyed and further mineralized into CO_2 and H _ 2O _ 2.
【作者单位】：苏州科技大学环境科学与工程学院;
【基金】：国家自然科学基金资助项目(51478283) 苏州科技大学大学生创新训练计划项目(201613985007Y)
【分类号】：X788

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