纳米铁锰混合金属氧化物活化过一硫酸盐降解染料废水  

Degradation of dye wastewater by nano iron-manganese mixed metal oxides activating peroxymonosulfate

作　　者：黄全佳 HUANG Quanjia(Xiamen Environmental Monitoring Station,Xiamen Fujian 361021)

机构地区：[1]厦门市环境监测站,福建厦门361021

出　　处：《环境污染与防治》2021年第10期1263-1268,1273,共7页Environmental Pollution & Control

摘　　要：采用高温煅烧法制备纳米铁锰混合金属氧化物(MnFe-MMO)作为催化剂,活化过一硫酸盐(PMS)氧化染料废水中的活性黑5(RB5)。采用X射线粉末衍射、扫描电子显微镜、傅立叶变换红外光谱分析了MnFe-MMO的晶体结构及形貌特征。探讨了催化剂投加量、PMS投加量、pH以及无机阴离子和天然有机物对RB5降解的影响。结果表明,在MnFe-MMO投加量为0.3 g/L、PMS投加量为0.3 g/L、pH=7的条件下,RB5(10 mg/L)在60 min时的降解率达到88%。HCO-3和腐殖酸抑制了RB5的降解,而Cl-轻微促进RB5的降解。自由基猝灭实验表明,MnFe-MMO/PMS体系中产生的自由基主要为SO_(4)^(-)·和·OH,并且SO_(4)^(-)·在降解过程中起主导作用。协同效应实验证明铁锰的协同作用提升了MnFe-MMO对PMS的催化能力。三维荧光光谱分析结果表明,MnFe-MMO/PMS体系产生的·OH和SO_(4)^(-)·可破坏RB5大分子,使其最终降解为小分子聚羧酸类腐殖酸。Nano iron-manganese mixed metal oxides catalyst(MnFe-MMO)was prepared by high-temperature calcination method and applied for activating peroxymonosulfate(PMS)to degrade reactive black 5(RB5)in dye wastewater.XRD,SEM and FTIR were utilized to analyze the crystal structure and morphological characteristics of MnFe-MMO.Effects of catalyst dosage,PMS dosage,pH,inorganic anion and natural organic matter on the degradation of RB5 were also investigated.The results indicated that the removal rate of RB5(10 mg/L)could reach 88%at 60 min when the catalyst dosage was 0.3 g/L,the PMS dosage was 0.3 g/L and the initial pH was 7.In addition,HCO_(3)^(-) and humid acid performed negative effects on RB5 degradation while Cl-slightly promoted it.Quenching experiments demonstrated that both SO_(4)^(-)·and·OH were the main active radicals in RB5 degradation in MnFe-MMO/PMS system,and SO_(4)^(-)·played a key role in the reaction.The synergistic effect experiments showed that the synergistic effect of Mn and Fe improved the catalytic ability of MnFe-MMO on PMS.Three-dimensional fluorescence analysis indicated that the production of SO_(4)^(-)·and·OH in MnFe-MMO/PMS system could effectively destroy RB5 and further degrade it into small molecular polycarboxylate humic acid.

关 键 词：铁锰混合金属氧化物 过一硫酸盐 有机染料 高级氧化 

分 类 号：X703[环境科学与工程—环境工程] TQ426[化学工程]