纳米Fe~0/FeS复合材料制备及降解偶氮染料废水
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摘要
以Na_2S为硫源成功制备了比表面积为29.61 m~2/g、含有纳米Fe~0、少量FeS及铁氧化物的纳米S-nZVI新型复合材料,用于典型偶氮染料甲基橙的降解。优化了材料的硫化率、投加量和初始甲基橙含量等降解工艺参数,并研究了不同硫化率下S-nZVI降解甲基橙的动力学。结果表明,S-nZVI材料的硫化率和投加量等因素对甲基橙降解效率具有较大的影响,而甲基橙初始含量对其影响并不大。当甲基橙初始质量浓度为20 mg/L,控制优化降解条件S-nZVI硫化率(Fe~0、FeS的摩尔比)为3:1,投加量为70 mg,反应10 min左右,降解率接近100%。反应40 min时,S-nZVI降解甲基橙符合准1级反应动力学。合成的纳米S-nZVI新型复合材料具有很大的工业应用潜力。
Na_2S was adopted as sulfur source for preparing nano Fe~0/FeS(S-nZVI) composite with specific surface area of 29.61 m~2/g, and containing nano Fe~0, a little FeS and iron oxides. The composite was used for a typical azo dye(methyl orange) degradation. The degradation technological parameters of sulfidation rate, the dosage of the composite and the initial content of methyl orange were optimized and the degradation kinetics of methyl orange by S-nZVI under different sulfidation rate was also investigated. The results showed that the sulfidation rate and the dosage of S-n ZVI composite had a great influence on the degradation efficiency of methyl orange, while the initial content of methyl orange had little influence. When the initial mass concentration of methyl orange was 20 mg/L, the optimum degradation conditions were as follows, S-nZVI sulfidation rate(Fe~0/FeS molar ratio) was 3:1, dosage of S-nZVI composite was 70 mg, and degradation rate could reach near 100% at 10 min. S-nZVI composite for methyl orange degradation was basically followed the first-order kinetic model after 40 min reaction. Therefore prepared S-nZVI composite has great potential for industrial application.
Na_2S was adopted as sulfur source for preparing nano Fe~0/FeS(S-nZVI) composite with specific surface area of 29.61 m~2/g, and containing nano Fe~0, a little FeS and iron oxides. The composite was used for a typical azo dye(methyl orange) degradation. The degradation technological parameters of sulfidation rate, the dosage of the composite and the initial content of methyl orange were optimized and the degradation kinetics of methyl orange by S-nZVI under different sulfidation rate was also investigated. The results showed that the sulfidation rate and the dosage of S-n ZVI composite had a great influence on the degradation efficiency of methyl orange, while the initial content of methyl orange had little influence. When the initial mass concentration of methyl orange was 20 mg/L, the optimum degradation conditions were as follows, S-nZVI sulfidation rate(Fe~0/FeS molar ratio) was 3:1, dosage of S-nZVI composite was 70 mg, and degradation rate could reach near 100% at 10 min. S-nZVI composite for methyl orange degradation was basically followed the first-order kinetic model after 40 min reaction. Therefore prepared S-nZVI composite has great potential for industrial application.
引文
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[15]SU Y M,ADELEYE A S,HUANG Y X,et al.Direct synthesis of novel and reactive sulfide-modified nano iron through nanoparticle seeding for improved cadmium-contaminated water treatment[J/OL].Sci Rep,2016,6.https://www.nature.com/articles/srep24358/figures/#article-info.
[2]郝晓丹,魏杰,张钱丽,等.电解二氧化锰对亚甲基蓝和甲基橙染料吸附性能的研究[J].水处理技术,2013(3):23-27.
[3]刘桂梅,郭兵毅,曾玉彬.磁性石墨烯负载纳米Fe/Cu去除水中硝酸盐氮[J].水处理技术,2017,43(2):58-62.
[4]KIM E J,KIM J H,AZAD A M,et al.Facile synthesis and characterization of Fe/FeS nanoparticles for environmental applications[J].ACS Appl Mater Inter,2011,3(5):1457-1462.
[5]SU Y,ADELEYE A S,Keller A A,et al..Magnetic sulfide-modified nanoscale zerovalent iron(S-nZVI)for dissolved metal ion removal[J].Water Res.2015,74:47-57.
[6]ZHANG Y,SU Y,ZHOU X,et al.A new insight on the core-shell structure of zerovalent iron nanoparticles and its application for Pb(II)sequestration[J].J Hazard Mater,2013,263(2):685-693.
[7]肖文燕.Fe S和Fe/FeS颗粒的制备、表征及用于水中Cr(VI)去除的试验研究[J].重庆:重庆大学,2016:1-6.
[8]钟金汤.偶氮染料及其代谢产物的化学结构与毒性关系的回顾与前瞻[J].环境与职业医学,2004,21(1):58-62.
[9]FAN D,ANITORI R P,TEBO B M,et al.Oxidative remobilization of technetium sequestered by sulfide-transformed nano zerovalent iron[J].Environ Sci Technol,2014,48(13):7409-7417.
[10]Eren E.Adsorption performance and mechanism in binding of azo dye by raw bentonite[J].Clean-Soil,Air,Water,2010,38(8):758-763.
[11]Wu P,Li S,Ju L,et al.Mechanism of the reduction of hexavalent chromium by organo-montmorillonite supported iron nanoparticles[J].J Hazard.Mater,2012,6:283-288.
[12]FU R,YANG Y,XU Z,et al..The removal of chromium(VI)and lead(II)from groundwater u sing sepiolite-supported nanoscale zero-valent iron(S-NZVI)[J].Chemosphere,2015,138:726-734.
[13]常兰,秦伟超.酸性品红在石墨烯上的吸附平衡和吸附动力学研究[J].水处理技术,2014,40(7):16-19.
[14]Thanh N T K,Maclean N,Mahiddine S.Mechanisms of nucleation and growth of nanoparticles in solution[J].Chem Rev,2014,114(15):7610-7630.
[15]SU Y M,ADELEYE A S,HUANG Y X,et al.Direct synthesis of novel and reactive sulfide-modified nano iron through nanoparticle seeding for improved cadmium-contaminated water treatment[J/OL].Sci Rep,2016,6.https://www.nature.com/articles/srep24358/figures/#article-info.
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