碳化钛与三价铁离子协同过硫酸钠对活性染料废水的降解  

Degradation of reactive dye wastewater by titanium carbide and Fe^(3+) activated sodium persulfate

作　　者：李万新 舒大武 安芳芳 韩博 任支刚 单巨川[1] LI Wanxin;SHU Dawu;AN Fangfang;HAN Bo;REN Zhigang;SHAN Juchuan(College of Textile and Garments,Hebei University of Science and Technology,Shijiazhuang,Hebei 050018,China;Zibo Molinhui New Material Co.,Ltd.,Zibo,Shandong 255000,China)

机构地区：[1]河北科技大学纺织服装学院,河北石家庄050018 [2]淄博墨林汇新材料有限公司,山东淄博255000

出　　处：《纺织学报》2025年第1期138-147,共10页Journal of Textile Research

基　　金：大学生创新创业训练计划项目(202410082023,X202410082063);河北省教育厅基金项目(QN2023090,QN2024163)。

摘　　要：为提高染色废水处理效率,降低废水处理过程中的过渡金属用量,利用二维纳米材料MXene(Ti_(3)C_(2))还原微量Fe^(3+),实现过硫酸钠(SPS)快速活化降解C.I.活性黑5(RB5)废水。以0.05 g/L RB5溶液为研究对象,降解率为评价指标,探究SPS质量浓度、FeCl_(3)浓度、MXene质量浓度、初始pH值和RB5降解率的关系。通过自由基猝灭实验,探究染料降解过程中自由基的贡献率。结果表明:RB5模拟染液使用2 g/L SPS、0.06 mmol/L FeCl_(3)和60 mg/L MXene混合液在25℃处理30 min时,降解率高达99.3%;RB5降解符合准一级反应动力学,中性条件下,利用Fe^(3+)/SPS/MXene体系处理模拟染液时,RB5的降解速率为0.15 min^(-1),较不含MXene体系处理的0.0008 min^(-1)提高187倍;使用MXene后,MXene表面附着颗粒结构,生成大量Ti—O,使Ti元素含量降低,同时引入Fe元素,使其结晶度降低1.13%;利用MXene可触发Fe^(3+)/Fe^(2+)循环,加速活化SPS降解染料,·OH是降解染料的主体;使用Fe^(3+)/SPS/MXene处理染色废水时,NaCl等无机盐会显著改变脱色速率,但几乎不影响最终脱色率。Objective In order to enhance the efficiency of dyeing wastewater treatment and decrease the presence of transition metals in the process,Ti_(3)C_(2) MXene was employed to reduce trace Fe^(3+)for rapid activation degradation of C.I.Reactive Black 5(RB5)wastewater by sodium persulfate(SPS).Method The RB5 solution was used as the research subject,and the degradation rate was employed as the evaluation criterion.The relationship between the concentrations of sodium persulfate(SPS),FeCl_(3),and MXene,initial pH was investigated,and the influence of MXene on the degradation of RB5.The contribution rate of free radicals in the process of dye degradation was investigated through free radical quenching experiments.Results The results showed that the degradation rate of RB5 simulated wastewater was up to 99.3%when a mixture of 2.0 g/L SPS,0.06 mmol/L FeCl_(3),and 60 mg/L MXene was stirred at 25℃for 30 min.After MXene was applied,particle structures adhered to the surface.Furthermore,the formation of numerous Ti—O bonds and the reduction of Ti element introduced Fe element,leading to a 1.13%decrease in the crystallinity of the characteristic peak.The Fe^(3+)/SPS/MXene system effectively degraded RB5.This is mainly attributed to MXene′s role in promoting the reduction of Fe^(3+)to Fe^(2+),thereby accelerating the activation of SPS.RB5 degradation followed quasi-first-order reaction kinetics.Both Fe^(3+)and MXene demonstrated significant effects on the activation of SPS.The degradation efficiency of organic pollutants was modulated by changing the concentrations of Fe^(3+)and MXene.The degradation rate of RB5 was decreased as the pH value increased.Under alkaline conditions,iron ions were transformed into precipitates and lost their catalytic ability.This,in turn,hindered the effective degradation of dye molecules.In addition,MXene effectively prevented the hydrolysis of Fe^(3+)ions in water through its interlayer confinement effect.After the utilization of Ti_(3)C_(2) MXene,the elemental O content was increased from 2

关 键 词：活性染料 MXene 过硫酸钠 自由基 染料废水 染料降解率 

分 类 号：X791[环境科学与工程—环境工程]