TiO2 -Fe3 O4纳米复合材料活化过硫酸盐降解活性红198及建模与优化方法

IF 1.3 Q4 ENVIRONMENTAL SCIENCES
S. Rahimi, F. Mohammadi, Soudabeh Ghodsi, Maryam Mohammadi, H. Karimi
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引用次数: 0

摘要

背景:近年来,硫酸盐基光催化工艺因其在污染物净化方面的独特优势而引起了人们的广泛关注。本研究采用TiO2 -Fe3 O4纳米复合材料在过硫酸盐存在下,在紫外发光二极管(UV-LED)照射下对活性红198进行脱除,重点考察了pH、过硫酸盐摩尔浓度、照射时间和不同初始浓度下催化剂用量等主要操作参数。方法:采用共沉淀法合成纳米颗粒。采用x射线衍射(XRD)、场发射扫描电镜(FESEM)、能量色散x射线(EDX)和傅里叶变换红外光谱(FTIR)对TiO2 - fe3o4纳米复合材料进行了表征。采用响应面法(RSM)进行建模和优化。研究了硫酸盐和羟基自由基脱色的动力学和机理。用总有机碳(TOC)分析评价染料的矿化程度。结果:通过RSM建模和优化表明,在UV-LED照射62 ~ 85 min,过硫酸盐浓度为0.8 ~ 1 mM, TiO2 - fe3 O4纳米复合材料浓度为0.19 ~ 0.3 g/L, pH=3的条件下,活性红198的脱色效果最佳,初始浓度为10 ~ 50 mg/L。过程动力学符合准一级动力学。在最佳条件下,活性红198的矿化率分别为61.1%和49.6%,脱色率分别为98.1%和87.6%。结论:在过硫酸盐存在下,紫外- led照射下制备TiO2 -Fe3 O4纳米复合材料是一种高效的脱除纺织废水染料的方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Activation of persulfate by TiO2 -Fe3 O4 nanocomposite for reactive red 198 degradation along with modeling and optimization approach
Background: Recently, sulfate radical-based photocatalytic processes have attracted significant interests because of unique advantages in pollutants purification. In this study, TiO2 -Fe3 O4 nanocomposites in the presence of persulfate and under ultraviolet light-emitting diode (UV-LED) irradiation were applied for reactive red 198 removal with a focus on the main operating parameters such as pH, persulfate molar concentration, irradiation time, and catalyst dosages in different initial concentrations. Methods: The nanoparticles were synthesized by co-precipitation technique. The X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) coupled with energy dispersive X-ray (EDX) and Fourier transform infrared spectroscopy (FTIR) analysis were used to evaluate TiO2 - Fe3 O4 nanocomposites. The response surface methodology (RSM) was employed for modeling and optimization. The kinetics and mechanisms of decolorization by sulfate and hydroxyl radicals were investigated. The mineralization of dye was evaluated using total organic carbon (TOC) analysis. Results: Modeling and optimization through RSM showed that the maximum decolorization of reactive red 198 is accursed an initial concentration of 10-50 mg/L was reached under UV-LED irradiation of 62- 85 min, persulfate concentration=0.8-1 mM, 0.19-0.3 g/L TiO2 -Fe3 O4 nanocomposites concentration, and pH=3. The kinetics of process was in agreement with pseudo-first order. The mineralization of reactive red 198 during the optimum conditions was determined at about 61.1% and 49.6%, meanwhile, the decolorization efficiency in the same conditions was approximately 98.1% and 87.6%, respectively. Conclusion: The use of TiO2 -Fe3 O4 nanocomposites under UV-LED irradiation in the presence of persulfate can be used as an efficient and promising method for dye removal from textile wastewater.
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来源期刊
CiteScore
2.40
自引率
37.50%
发文量
17
审稿时长
12 weeks
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