菠萝皮生物炭负载纳米零价铁去除水中的铬
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摘要
以菠萝皮制成的生物炭为载体负载纳米零价铁(n ZVI)合成功能性生物炭(n ZVI/BC),采用X射线衍射(XRD)、扫描电镜(SEM)和X射线光电子能谱(XPS)等方法对材料进行表征,考察了p H和初始Cr(Ⅵ)浓度对Cr(Ⅵ)的去除率的影响,并对其机理进行研究。结果表明:n ZVI/BC对Cr(Ⅵ)的去除效率在p H=3时达到峰值90. 3%,而在p H=9时去除效率最低。吸附动力学实验数据符合准二级动力学(PSO)模型;当Cr(Ⅵ)的初始浓度由10 mg/L增加到30 mg/L时,速率常数由0. 466 0 min-1减小到0. 237 1 min-1,说明反应速率随着溶液Cr(Ⅵ)初始浓度的增大而减小。SEM图像显示n ZVI与生物炭的表面结合良好。反应前后的XRD和XPS分析表明,在反应过程中,n ZVI和Cr(Ⅵ)发生吸附,还原和共沉淀。因此,菠萝皮生物炭负载n ZVI可作为水中Cr(Ⅵ)去除的有效复合材料。
Nanoscale zerovalent iron supported on biochar made by pineapple peel( n ZVI/BC) was synthesized and its Cr( Ⅵ) removal capability was evaluated and compared with pure nZVI and raw biochar. The effects of p H and initial Cr( Ⅵ) concentration on the removal of Cr( Ⅵ) were investigated. The removal mechanism was studied. The Cr( Ⅵ) removal efficiency by nZVI/BC achieved 90. 3% at p H = 3 and the minimum removal efficiency was observed at pH = 9. The adsorption kinetics data agreed well with the pseudo-second-order( PSO) model.When the initial concentration of Cr( Ⅵ) increased from 10 mg/L to 30 mg/L,the rate constant decreased from0. 466 0 to 0. 237 1,indicating that the reaction rate decreased with the initial concentration of Cr( Ⅵ) increasing.SEM images revealed that nanoscale was well attached to the surface of the biochar. XRD and XPS analysis of before and after reaction proved that nZVI and Cr( Ⅵ) underwent adsorption,reduction and coprecipitation during the reaction. Therefore,Nanoscale zerovalent iron supported on biochar made by pineapple peel can be used as an effective composite material for Cr( Ⅵ) removal in water.
Nanoscale zerovalent iron supported on biochar made by pineapple peel( n ZVI/BC) was synthesized and its Cr( Ⅵ) removal capability was evaluated and compared with pure nZVI and raw biochar. The effects of p H and initial Cr( Ⅵ) concentration on the removal of Cr( Ⅵ) were investigated. The removal mechanism was studied. The Cr( Ⅵ) removal efficiency by nZVI/BC achieved 90. 3% at p H = 3 and the minimum removal efficiency was observed at pH = 9. The adsorption kinetics data agreed well with the pseudo-second-order( PSO) model.When the initial concentration of Cr( Ⅵ) increased from 10 mg/L to 30 mg/L,the rate constant decreased from0. 466 0 to 0. 237 1,indicating that the reaction rate decreased with the initial concentration of Cr( Ⅵ) increasing.SEM images revealed that nanoscale was well attached to the surface of the biochar. XRD and XPS analysis of before and after reaction proved that nZVI and Cr( Ⅵ) underwent adsorption,reduction and coprecipitation during the reaction. Therefore,Nanoscale zerovalent iron supported on biochar made by pineapple peel can be used as an effective composite material for Cr( Ⅵ) removal in water.
引文
1 Li X,Ai L,Jiang J. Nanoscale zerovalent iron decorated on graphene nanosheets for Cr(Ⅵ)removal from aqueous solution:Surface corrosion retard induced the enhanced performance[J]. Chemical Engineering Journal,2016,288:789-797
2 Beaver L M,Stemmy E J,Constant S L,et al. Lung injury,inflammation and Akt signaling following inhalation of particulate hexavalent chromium[J]. Toxicology and Applied Pharmacology,2009,235(1):47-56
3 Zhang N,Fang Z,Zhang R. Comparison of several amendments for in-site remediating chromium-contaminated farmland soil[J]. Water Air&Soil Pollution,2017,228(10):1-10
4 Jin X, Zhuang Z, Yu B, et al. Functional chitosan-stabilized nanoscale zero-valent iron used to remove acid fuchsine with the assistance of ultrasound[J]. Carbohydrate Polymers, 2016, 136:1085-1090
5 Zhou X,Lv B,Zhou Z,et al. Evaluation of highly active nanoscale zero-valent iron coupled with ultrasound for chromium(Ⅵ)removal[J]. Chemical Engineering Journal,2015,281:155-163
6 Shi L, Zhang X, Chen Z. Removal of Chromium(Ⅵ)from wastewater using bentonite-supported nanoscale zero-valent iron[J].Water Research,2011,45(2):886-892
7 Brewer C E,Schmidt-Rohr K,Satrio J A,et al. Characterization of biochar from fast pyrolysis and gasification systems[J]. Environmental Progress&Sustainable Energy,2009,28(3):386-396
8 Inyang M,Dickenson E. The potential role of biochar in the removal of organic and microbial contaminants from potable and reuse water:A review[J]. Chemosphere,2015,134:232-240
9 Su H,Fang Z,Tsang P E,et al. Remediation of hexavalent chromium contaminated soil by biochar-supported zero-valent iron nanoparticles[J]. Journal of Hazardous Materials,2016,318:533-540
10 Liu Z,Zhang F. Removal of lead from water using biochars prepared from hydrothermal liquefaction of biomass[J]. Journal of Hazardous Materials,2009,167(1):933-939
11 Shang J,Zong M,Yu Y,et al. Removal of chromium(Ⅵ)from water using nanoscale zerovalent iron particles supported on herb-residue biochar[J]. Journal of Environmental Management,2017,197:331-337
12 Dong H,Deng J,Xie Y,et al. Stabilization of nanoscale zerovalent iron(nZVI)with modified biochar for Cr(Ⅵ)removal from aqueous solution[J]. Journal of Hazardous Materials,2017,332:79-86
13 Arancibia-Miranda N,Baltazar S E,García A,et al. Nanoscale zero valent supported by Zeolite and Montmorillonite:Template effect of the removal of lead ion from an aqueous solution[J]. Journal of Hazardous Materials,2016,301:371-380
14 Wang S,Tang Y,Li K,et al. Combined performance of biochar sorption and magnetic separation processes for treatment of chromium-contained electroplating wastewater[J]. Bioresource Technology,2014,174:67-73
15 R2 Nav2 R A,Bal2 Z M,Tolmacsov P,et al. Impact of the morphology and reactivity of nanoscale zero-valent iron(NZVI)on dechlorinating bacteria[J]. Water Research,2016,95:165-173
16 曾淦宁,武晓,郑林,等.负载纳米零价铁铜藻基活性炭的制备及其去除水中Cr﹙Ⅵ﹚的研究[J].环境科学. 2015,36(2):530-536Zeng Ganning,Wu Xiao,Zheng Lin,et al. Preparation of nano zero-valent iron/sargassum horneri based activated carbon for removal of Cr(Ⅵ)from aqueous solution[J]. Environmental Science,2015,36(2):530-536
17 Bae S,Gim S,Kim H,et al. Effect of Na BH4 on properties of nanoscale zero-valent iron and its catalytic activity for reduction of pnitrophenol[J]. Applied Catalysis B:Environmental,2016,182:541-549
2 Beaver L M,Stemmy E J,Constant S L,et al. Lung injury,inflammation and Akt signaling following inhalation of particulate hexavalent chromium[J]. Toxicology and Applied Pharmacology,2009,235(1):47-56
3 Zhang N,Fang Z,Zhang R. Comparison of several amendments for in-site remediating chromium-contaminated farmland soil[J]. Water Air&Soil Pollution,2017,228(10):1-10
4 Jin X, Zhuang Z, Yu B, et al. Functional chitosan-stabilized nanoscale zero-valent iron used to remove acid fuchsine with the assistance of ultrasound[J]. Carbohydrate Polymers, 2016, 136:1085-1090
5 Zhou X,Lv B,Zhou Z,et al. Evaluation of highly active nanoscale zero-valent iron coupled with ultrasound for chromium(Ⅵ)removal[J]. Chemical Engineering Journal,2015,281:155-163
6 Shi L, Zhang X, Chen Z. Removal of Chromium(Ⅵ)from wastewater using bentonite-supported nanoscale zero-valent iron[J].Water Research,2011,45(2):886-892
7 Brewer C E,Schmidt-Rohr K,Satrio J A,et al. Characterization of biochar from fast pyrolysis and gasification systems[J]. Environmental Progress&Sustainable Energy,2009,28(3):386-396
8 Inyang M,Dickenson E. The potential role of biochar in the removal of organic and microbial contaminants from potable and reuse water:A review[J]. Chemosphere,2015,134:232-240
9 Su H,Fang Z,Tsang P E,et al. Remediation of hexavalent chromium contaminated soil by biochar-supported zero-valent iron nanoparticles[J]. Journal of Hazardous Materials,2016,318:533-540
10 Liu Z,Zhang F. Removal of lead from water using biochars prepared from hydrothermal liquefaction of biomass[J]. Journal of Hazardous Materials,2009,167(1):933-939
11 Shang J,Zong M,Yu Y,et al. Removal of chromium(Ⅵ)from water using nanoscale zerovalent iron particles supported on herb-residue biochar[J]. Journal of Environmental Management,2017,197:331-337
12 Dong H,Deng J,Xie Y,et al. Stabilization of nanoscale zerovalent iron(nZVI)with modified biochar for Cr(Ⅵ)removal from aqueous solution[J]. Journal of Hazardous Materials,2017,332:79-86
13 Arancibia-Miranda N,Baltazar S E,García A,et al. Nanoscale zero valent supported by Zeolite and Montmorillonite:Template effect of the removal of lead ion from an aqueous solution[J]. Journal of Hazardous Materials,2016,301:371-380
14 Wang S,Tang Y,Li K,et al. Combined performance of biochar sorption and magnetic separation processes for treatment of chromium-contained electroplating wastewater[J]. Bioresource Technology,2014,174:67-73
15 R2 Nav2 R A,Bal2 Z M,Tolmacsov P,et al. Impact of the morphology and reactivity of nanoscale zero-valent iron(NZVI)on dechlorinating bacteria[J]. Water Research,2016,95:165-173
16 曾淦宁,武晓,郑林,等.负载纳米零价铁铜藻基活性炭的制备及其去除水中Cr﹙Ⅵ﹚的研究[J].环境科学. 2015,36(2):530-536Zeng Ganning,Wu Xiao,Zheng Lin,et al. Preparation of nano zero-valent iron/sargassum horneri based activated carbon for removal of Cr(Ⅵ)from aqueous solution[J]. Environmental Science,2015,36(2):530-536
17 Bae S,Gim S,Kim H,et al. Effect of Na BH4 on properties of nanoscale zero-valent iron and its catalytic activity for reduction of pnitrophenol[J]. Applied Catalysis B:Environmental,2016,182:541-549
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