摘要
在热活化过硫酸盐氧化去除单一木质素降解产物的基础上,本文主要研究4种不同木质素降解产物混合物在与单独氧化条件相同情况下的去除规律和效果。结果表明,与9种木质素降解产物分别单独氧化时100%去除相比,3种酚醛类混合物的去除效果要高于3种酚酸类混合物;6种木质素降解产物混合物与9种木质素降解产物混合物的去除规律也不同,但混合物中木质素降解产物总的去除效果要低于单独氧化的100%。这说明氧化不同种类木质素降解产物时有一定的选择性,去除效果不仅与不同木质素降解产物的结构有关,也与自由基浓度有关。因此,对于木质素降解产物混合物需要提高过硫酸铵浓度,从而提高自由基浓度来提高反应速率和去除率。
On the basis of single oxidation removal of nine lignin-degradation products by heat-activated persulfate, oxidation removal of four kinds of different lignin-degradation products＇ mixture was studied under the same oxidation conditions as single oxidation. The results indicated that compared to 100 % removal ratio of nine lignin-degradation products by single oxidation, the removal ratio of three phenolic aldehydes＇ mixture was higher than that of three phenolic acids＇ mixture; the removal characteristic of six lignin-degradation products＇ mixture and nine lignin-degradation products＇ mixture was also different, but the removal efficiency of lignin-degradation products＇ mixture was lower than that of single lignin-degradation product （100 %）. This indicated that oxidation removal of different kinds of lignin-degradation products had certain selectivity. The removal efficiency was not only related to the structure of lignin-degradation products, but also to the concentration of free radicals. Therefore, it was needed to increase the persulfate concentration, which could increase the concentration of free radicals to improve the reaction rate and removal ratio of lignin-degradation products＇ mixture.
出处
《广东化工》
CAS
2017年第11期22-24,共3页
Guangdong Chemical Industry
基金
江苏省高等学校大学生创新创业训练计划资助项目(No.201510298093X)
江苏省普通高校研究生科研创新计划资助项目(No.SJLX15_0405)
江苏高校优势学科建设工程资助项目
