以硝酸铁和硅酸钠为原料,采用共沉淀法制得聚铁硅盐掺杂羟基氧化铁(PISS-FeOOH),由PISS-FeOOH活化过硫酸钾(PS)构成PISS-FeOOH/PS体系,用于降解甲基橙(MO)。采用FT-IR、XRD和SEM-EDS对样品的结构和形貌进行表征,以MO为目标污染物,考察了溶液初始质量浓度、初始pH、反应温度、PISS-FeOOH和PS投加量对PISS-FeOOH/PS降解MO的影响,初步探究了体系中起主要作用的自由基。结果表明,PISS-FeOOH/PS可有效降解MO,当反应温度为25℃,MO的初始浓度为10mg/L,初始pH为3,PISS-FeOOH和PS的投加量分别为0.5g/L和90mg/L,反应180min后,PISS-FeOOH/PS对MO的去除率可达87.55%。自由基淬灭实验结果表明,·SO-4和·OH在降解MO过程中起主要作用。
The polyiron silicate doped iron oxyhydroxide (PISS-FeOOH) catalyst was synthesized by coprecipitation method using Fe(NO3)3 and Na2SiO3 as raw materials,and after that,PISS-FeOOH was used to activate potassium persulfate (PS) to form a PISS-FeOOH/PS to degrade methyl orange (MO).The microstructure and morphology of the samples were characterized by FT-IR,XRD and SEM-EDS.With MO as the target pollutant,the effects of initial concentration of solution,pH,reaction temperature,PISS-FeOOH and PS dosage on the degradation of MO by PISS-FeOOH/PS were investigated,and the main free radicals in the system were preliminarily explored.The results showed that PISS-FeOOH/PS was able to effectively degrade MO.When the reaction temperature was 25℃,the initial concentration of MO was 10mg/L,the pH value was 3,the dosage of PISS-FeOOH and PS was 0.5g/L and 90mg/L,respectively,the removal rate of MO reached to 87.55% after 180min.The results of radical quenching experiments exhibited that ·SO-4 and ·OH played major roles in the degradation of MO.
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基金资助
国家自然科学基金青年项目(51808442);陕西省教育厅服务地方专项科学研究计划(20JC026)
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