臭氧微纳米气泡高级氧化降解甲基橙的研究  

Dynamics Study on Advanced Oxidation Degradation of Methyl Orange by Ozone Micro Nano Bubbles

作　　者：高碧荷 张哲[1] 方雨菲 肖巍 GAO Bihe;ZHANG Zhe;FANG Yufei;XIAO Wei(School of Resource Engineering,Xi′an University of Architecture and Technology,Xi′an 710055,China)

机构地区：[1]西安建筑科技大学资源工程学院,陕西西安710055

出　　处：《金属矿山》2025年第3期246-252,共7页Metal Mine

基　　金：中国博士后科学基金项目(编号:2022M712618)。

摘　　要：印染废水水质复杂,其中甲基橙(Methyl Orange,MO)为典型的污染组分,具有色度深、毒性强、对光和热敏感度低等特点,因而成为环保科研工作者研究的重要对象。单独臭氧(O_(3))氧化存在气液相传质效率低,容易受羟基自由基含量等的制约,微纳米气泡技术正好可以弥补此缺陷。基于此,研究采用臭氧微纳米气泡(O_(3)-MNBs)氧化体系降解偶氮染料MO,考察了模拟废水初始pH值、MO初始浓度和O_(3)通入量对体系降解MO的影响。结果表明,臭氧微纳米气泡高级氧化体系较单独O_(3)和单独微纳米气泡对MO的降解效果有明显提升,降解过程符合准一级动力学模型,且R^(2)≥0.9;在MO初始浓度25 mg/L、pH=4.6、O_(3)流量为1 L/min的最佳条件下,反应6 min的MO降解率达99%;自由基猝灭试验表明,羟基自由基(·OH)为O_(3)-MNBs体系主要的作用基团,有利于有机物的矿化,这主要是由于微纳米气泡自身破裂产生自由基,同时在界面处促进了羟基自由基与甲基橙的接触。The water quality of printing and dyeing wastewater is intricate,and methyl orange(MO),as a typical contaminant component,is characterized by its deep chromaticity,high toxicity,and low sensitivity to light and heat.Consequently,it has emerged as a crucial subject of research for environmental protection scientists and researchers.When ozone(O_(3))is used alone for oxidation,there are limitations such as low gas-liquid mass transfer efficiency,and its performance is notably constrained by factors including the content of hydroxyl radicals.Micro-nano bubble technology can effectively address these drawbacks.In light of this,this study employed an ozone micro-nano bubble(O_(3)-MNBs)oxidation system to degrade the azo dye MO.The impacts of the initial pH of the simulated wastewater,the initial concentration of MO,and the amount of O_(3) introduced on the degradation of MO within the system were investigated.The results demonstrated that the advanced oxidation system utilizing ozone micro-nano bubbles exhibited a significantly enhanced degradation efficiency of MO compared to the cases of using O_(3) alone or micro-nano bubbles alone.The degradation process adhered to a pseudo-first-order kinetic model,with an R^(2) value of≥0.9.Under the optimal conditions,namely an initial MO concentration of 25 mg/L,a pH value of 4.6,and an O_(3) flow rate of 1 L/min,the degradation rate of MO reached 99%after a reaction duration of 6 minutes.Free radical quenching experiments revealed that hydroxyl radicals(·OH)were the predominant reactive species in the O_(3)-MNBs system,which facilitated the mineralization of organic substances.This is primarily attributed to the generation of free radicals upon the rupture of micronano bubbles themselves,and the promotion of the contact between hydroxyl radicals and methyl orange at the interface.

关 键 词：微纳米气泡 臭氧氧化 甲基橙 动力学 

分 类 号：X52[环境科学与工程—环境工程]