β-FeOOH/盐酸羟胺/H_2O_2非均相Fenton降解酸性橙Ⅱ
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摘要
利用水热法合成棒状β-FeOOH,研究了在β-FeOOH/H_2O_2组成的非均相Fenton体系中加入低浓度的盐酸羟胺(HH)对酸性橙Ⅱ(AOⅡ)的去除效果,同时考察了pH值、H_2O_2浓度、HH浓度对其去除率的影响.结果表明:反应体系pH值、H_2O_2浓度、HH浓度对AOⅡ去除效果有较大影响,当反应体系pH值为3.0、c(H_2O_2)和c(HH)分别为2.5,0.5 mmol·L~(-1)时,β-FeOOH对AOⅡ的去除率较高,达到97.82%.该体系由均相和非均相Fenton反应体系共同组成,自由基捕获实验结果表明该体系的活性物为·OH.洗脱实验证明吸附阶段去除的AOII在催化阶段被降解.经4次循环使用之后β-FeOOH仍有较高的催化活性.
The nanorod-shaped β-FeOOH products are prepared by hydrothermal method.Degradation of acidic orange II(AOⅡ)in heterogeneous Fenton system composed of β-FeOOH/H_2O_2 with a low molar concentration of hydroxylamine hydrochloride(HH)is studied.Futhermore,the effects of pH value,H_2O_2 molar concentrations and hydroxylamine hydrochloride(HH)molar concentrations on the removal efficiency are investigated.The results show that the removal efficiency of AO Ⅱ is 97.82% under the optimal conditions of 2.5 mmol·L~(-1) H_2O_2 and 0.5 mmol·L~(-1) hydroxylamine hydrochloride(HH)at the initial pH value of 3.0.The system consists of homogeneous and heterogeneous Fenton reaction system,of which the active species is·OH from the free radical capture experimental results.The elution experiments demonstrate that the AOⅡ removed during the adsorption stage is degraded during the catalytic stage.The preparedβ-FeOOH samples still have high catalytic activity after four cycles.
The nanorod-shaped β-FeOOH products are prepared by hydrothermal method.Degradation of acidic orange II(AOⅡ)in heterogeneous Fenton system composed of β-FeOOH/H_2O_2 with a low molar concentration of hydroxylamine hydrochloride(HH)is studied.Futhermore,the effects of pH value,H_2O_2 molar concentrations and hydroxylamine hydrochloride(HH)molar concentrations on the removal efficiency are investigated.The results show that the removal efficiency of AO Ⅱ is 97.82% under the optimal conditions of 2.5 mmol·L~(-1) H_2O_2 and 0.5 mmol·L~(-1) hydroxylamine hydrochloride(HH)at the initial pH value of 3.0.The system consists of homogeneous and heterogeneous Fenton reaction system,of which the active species is·OH from the free radical capture experimental results.The elution experiments demonstrate that the AOⅡ removed during the adsorption stage is degraded during the catalytic stage.The preparedβ-FeOOH samples still have high catalytic activity after four cycles.
引文
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[2]XU Jing,LONG Yuyang,SHEN Dongsheng,et al.Optimization of Fenton treatment process for degradation of refractory organics in pre-coagulated leachate membrane concentrates[J].J Hazard Mater,2017,323(B):674-680.
[3]MIRZAEI A,CHEN Zhi,HAGHIGHAT F,et al.Removal of pharmaceuticals from water by homo/heterogonous Fenton-type processes:a review[J].Chemosphere,2017,174:665-688.
[4]MA Jianqing,YANG Qunfeng,WEN Yuezhong,et al.Fe-g-C3N4/graphitized mesoporous carbon composite as an effective Fenton-like catalyst in a wide pH range[J].Appl Catal B,2017,201:232-240.
[5]SUBRAMANIAN G,GIRIDHAR M.Remarkable enhancement of Fenton degradation at a wide pH range promoted by thioglycolic acid[J].Chem Commun,2017,53(6):1136-1139.
[6]YAO Hongbao,XIE Yu,JING Yu,et al.Controllable preparation and catalytic performance of heterogeneous Fenton-likeα-Fe2O3/crystalline glass microsphere catalysts[J].Ind Eng Chem Res,2017,56:13751-13759.
[7]TANG Xuekun,FENG Qiming,LIU Kun,et al.Fabrication of magnetic Fe3O4/silica nanofiber composites with enhanced Fenton-like catalytic performance for Rhodamine B degradation[J].J Mater Sci,2017,53(1):369-384.
[8]HOU Xiaojing,HUANG Xiaopeng,JIA Falong,et al.Hydroxylamine promoted goethite surface Fenton degradation of organic pollutants[J].Environ Sci Technol,2017,51(9):5118.
[9]MATTA R,HANNA K,KONE T,et al.Oxidation of 2,4,6-trinitrotoluene in the presence of different ironbearing minerals at neutral pH[J].Chem Eng,2008,144(3):453-458.
[10]WEI Xuejiao,MOU Xiaoling,ZHOU Yan,et al.Fabrication of rod-shapedβ-FeOOH:the roles of polyethylene glycol and chlorine anion[J].Sci China Chem,2016,59(7):895-902.
[11]朱诗蓓.FeOOH对重金属和富营养元素的吸附研究[D].扬州:扬州大学,2016.
[12]严梅,张青,谢慧芳,等.纳米Fe3O4负载聚苯胺对染料的协同催化降解[J].中国环境科学,2017,37(4):1394-1400.