NiO^(x)(OH)_(y)/NaClO催化氧化体系对模拟印染废水中活性艳红K-2BP的降解脱色效果  

Degradation and decolorization of reactive brilliant red K-2BP in simulated printing and dyeing wastewater by NiO_(x)(OH)_(y)/NaClO catalytic oxidation system

作　　者：徐文英[1,2] 高浩阳 XU Wenying;GAO Haoyang(College of Environmental Science and Engineering,Tongji University,Shanghai 200092,China;National Engineering Research Center for Urban Pollution Control,Tongji University,Shanghai 200092,China)

机构地区：[1]同济大学环境科学与工程学院,上海200092 [2]同济大学城市污染控制国家工程研究中心,上海200092

出　　处：《环境工程学报》2021年第3期835-846,共12页Chinese Journal of Environmental Engineering

基　　金：道扬环保科技有限公司,印染废水降解新工艺的开发项目(kh0040020183321)。

摘　　要：采用NaClO和浸渍法制备的小球型复合镍基催化剂NiO^(x)(OH)_(y)/γ-Al_(2)O_(3)组成的体系,对活性艳红K2BP模拟废水进行了降解脱色的系统研究,探讨了反应条件对脱色率和反应后出水中Ni^(2+)溶出量的影响,分析了染料的降解机理。结果表明:该体系对染料的脱色效果良好,脱色率随着染料浓度的增加而降低,其随着初始pH、有效氯和催化剂投加量的增加而增加;连续流实验中染料的脱色率达到80%以上,在运行至9000 min时,催化剂没有出现失活现象;原子氧在染料降解过程中起到主导作用。采用SEM和XPS对催化层结构进行了表征,催化层中的化学吸附氧占比先增加后减小,新制备的催化层的化学吸附氧占比为87%;当用过720 min后,其占比增大到91%;经连续流实验运行3000 min后,其占比降低到83%。本催化体系在印染废水处理中具有一定的应用潜力。Degradation and decolorization of simulated reactive brilliant red K-2BP wastewater were systematically studied in a system composed of NaClO and bead-type composite nickel-based catalyst NiO_(x)(OH)_(y)/γ-Al_(2)O_(3) prepared by impregnation method.The effects of reaction conditions on decolorization rate of the simulated wastewater and Ni^(2+)leaching amount in the treated effluent were discussed,and the degradation mechanism of the dye was also analyzed.The results showed that the system had a good decolorization effect on the dye,and the decolorization rate decreased with the increase of dye concentration,and increased with the increase of initial pH,available chlorine and catalyst dosage.In the continuous flow test,the decolorization rate was over 80%,and the deactivation of catalyst did not occur after 9000 min operation.Atomic oxygen played an important role in the degradation of reactive brilliant red K-2BP.The structure of the catalytic layer was characterized by SEM and XPS.The proportion of chemisorbed oxygen in the catalytic layer increased first and then decreased,it was 87%in the newly prepared catalytic layer,and rose to 91%after 720 min running,then decreased to 83%after 3000 min of the continuous flow test.This catalytic oxidation system has certain potential applications in printing and dyeing wastewater treatment.

关 键 词：羟基氧化镍 次氯酸钠 催化机理 原子氧 活性艳红K-2BP 

分 类 号：X703.1[环境科学与工程—环境工程]