碳纳米管负载纳米零价铁去除水中多氯联苯
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摘要
采用液相还原法制备了碳纳米管负载纳米零价铁(MWCNT-nZVI)复合材料,并通过BET和XRD对该复合材料进行了结构表征。同时,比较了nZVI、MWCNT和MWCNT-nZVI对多氯联苯(PCBs)的去除效果,探究了MWCNT-nZVI投加量、温度、pH值和PCBs初始浓度对PCBs去除率的影响。试验结果表明,相同条件下MWCNT-nZVI对PCBs的去除率(71. 98%)高于MWCNT(63. 84%)和nZVI(41. 18%),且去除过程符合伪一级反应动力学模型。当MWCNT-nZVI投加量为1. 6 g/L、温度为25℃、pH值为7、PCBs初始浓度为1. 4 mg/L时,MWCNT-nZVI对PCBs的去除效果最好。
Composites of nanoscale zerovalent iron supported on carbon nanotubes (MWCNTnZVI) were prepared by liquid phase reduction method,and their structure was characterized by BET and XRD. The removal efficiency of polychlorinated biphenyls( PCBs) by nZVI,MWCNT and MWCNTnZVI was compared,and the effect of different reaction conditions including MWCNT-nZVI dosage,temperature,initial pH value and initial PCBs concentration on the removal of PCBs was investigated.The results indicated that the removal rate of PCBs by MWCNT-nZVI (71. 98%) was higher than that by MWCNT( 63. 84%) and nZVI( 41. 18%) under the same reaction condition,and the removal process was consistent with the pseudo-first-order reaction kinetic model. The MWCNT-nZVI composites showed the best removal effect on PCBs,when the MWCNT-nZVI dosage was 1.6 g/L,the temperature was 25℃,the initial pH value was 7 and the initial PCBs concentration was 1. 4 mg/L.
Composites of nanoscale zerovalent iron supported on carbon nanotubes (MWCNTnZVI) were prepared by liquid phase reduction method,and their structure was characterized by BET and XRD. The removal efficiency of polychlorinated biphenyls( PCBs) by nZVI,MWCNT and MWCNTnZVI was compared,and the effect of different reaction conditions including MWCNT-nZVI dosage,temperature,initial pH value and initial PCBs concentration on the removal of PCBs was investigated.The results indicated that the removal rate of PCBs by MWCNT-nZVI (71. 98%) was higher than that by MWCNT( 63. 84%) and nZVI( 41. 18%) under the same reaction condition,and the removal process was consistent with the pseudo-first-order reaction kinetic model. The MWCNT-nZVI composites showed the best removal effect on PCBs,when the MWCNT-nZVI dosage was 1.6 g/L,the temperature was 25℃,the initial pH value was 7 and the initial PCBs concentration was 1. 4 mg/L.
引文
[1]LüX S,Xu J,Jiang G M,et al.Removal of chromium(Ⅵ)from wastewater by nanoscale zero-valent iron particles supported on multiwalled carbon nanotubes[J].Chemosphere,2011,85(7):1204-1209.
[2]Sheng G D,Alsaedi A,Shammakh W,et al.Enhanced sequestration of selenite in water by nanoscale zero valent iron immobilization on carbon nanotubes by a combined batch,XPS and XAFS investigation[J].Carbon,2016,99:123-130.
[3]Zhang S,Wang D,Zhou L,et al.Intensified internal electrolysis for degradation of methylene blue as model compound induced by a novel hybrid material:Multiwalled carbon nanotubes immobilized on zero-valent iron plates(Fe0-CNTs)[J].Chem Eng J,2013,217:99-107.
[4]冯婧微,梁彦秋.PBTCA及TH-904改性纳米零价铁材料的制备及表征[J].材料导报,2013,27(14):4-7.Feng Jingwei,Liang Yanqiu.Preparation and characterization of Fe0nanoparticles modified with PBTCA and TH-904[J].Materials Review,2013,27(14):4-7(in Chinese).
[5]纪美茹,傅小奇,张雷,等.碳纳米管/羟基磷灰石复合材料的制备及表征[J].复合材料学报,2012,29(3):85-89.Ji Meiru,Fu Xiaoqi,Zhang Lei,et al.Preparation and characterization of carbon nanotubes/hydroxyapatite composites[J].Acta Materiae Compositae Sinica,2012,29(3):85-89(in Chinese).
[6]吴小勇,孙晓刚,庞志鹏,等.纳米管协同碳纳米管导电纸对石墨负极性能的影响[J].材料导报,2015,29(12):19-22.Wu Xiaoyong,Sun Xiaogang,Pang Zhipeng,et al.Influences of carbon nanotubes in combination with CNTs conductive paper on performance of graphite anode[J].Materials Review,2015,29(12):19-22(in Chinese).
[7]Choi H,Al-Abed S R,Agarwal S,et al.Synthesis of reactive nano-Fe/Pd bimetallic system-impregnated activated carbon for the simultaneous adsorption and dechlorination of PCBs[J].Chem Mater,2008,20(11):3649-3655.
[8]Wu X Q,Yang Q,Xu D C,et al.Simultaneous adsorption/reduction of bromate by nanoscale zerovalent iron supported on modified activated carbon[J].Ind Eng Chem Res,2013,52(35):12574-12581.
[9]曹秀芹,吕小凡,程琳.典型污水处理工艺对多氯联苯去除效果的分析[J].中国给水排水,2016,32(21):114-118.Cao Xiuqin,LüXiaofan,Cheng Lin.Analysis on removal efficiency of PCBs by typical wastewater treatment process[J].China Water&Wastewater,2016,32(21):114-118(in Chinese).
[10]Wei J J,Xu X H,Liu Y,et al.Catalytic hydrodechlorination of 2,4-dichlorophenol over nanoscale Pd/Fe:Reaction pathway and some experimental parameters[J].Water Res,2006,40(2):348-354.
[2]Sheng G D,Alsaedi A,Shammakh W,et al.Enhanced sequestration of selenite in water by nanoscale zero valent iron immobilization on carbon nanotubes by a combined batch,XPS and XAFS investigation[J].Carbon,2016,99:123-130.
[3]Zhang S,Wang D,Zhou L,et al.Intensified internal electrolysis for degradation of methylene blue as model compound induced by a novel hybrid material:Multiwalled carbon nanotubes immobilized on zero-valent iron plates(Fe0-CNTs)[J].Chem Eng J,2013,217:99-107.
[4]冯婧微,梁彦秋.PBTCA及TH-904改性纳米零价铁材料的制备及表征[J].材料导报,2013,27(14):4-7.Feng Jingwei,Liang Yanqiu.Preparation and characterization of Fe0nanoparticles modified with PBTCA and TH-904[J].Materials Review,2013,27(14):4-7(in Chinese).
[5]纪美茹,傅小奇,张雷,等.碳纳米管/羟基磷灰石复合材料的制备及表征[J].复合材料学报,2012,29(3):85-89.Ji Meiru,Fu Xiaoqi,Zhang Lei,et al.Preparation and characterization of carbon nanotubes/hydroxyapatite composites[J].Acta Materiae Compositae Sinica,2012,29(3):85-89(in Chinese).
[6]吴小勇,孙晓刚,庞志鹏,等.纳米管协同碳纳米管导电纸对石墨负极性能的影响[J].材料导报,2015,29(12):19-22.Wu Xiaoyong,Sun Xiaogang,Pang Zhipeng,et al.Influences of carbon nanotubes in combination with CNTs conductive paper on performance of graphite anode[J].Materials Review,2015,29(12):19-22(in Chinese).
[7]Choi H,Al-Abed S R,Agarwal S,et al.Synthesis of reactive nano-Fe/Pd bimetallic system-impregnated activated carbon for the simultaneous adsorption and dechlorination of PCBs[J].Chem Mater,2008,20(11):3649-3655.
[8]Wu X Q,Yang Q,Xu D C,et al.Simultaneous adsorption/reduction of bromate by nanoscale zerovalent iron supported on modified activated carbon[J].Ind Eng Chem Res,2013,52(35):12574-12581.
[9]曹秀芹,吕小凡,程琳.典型污水处理工艺对多氯联苯去除效果的分析[J].中国给水排水,2016,32(21):114-118.Cao Xiuqin,LüXiaofan,Cheng Lin.Analysis on removal efficiency of PCBs by typical wastewater treatment process[J].China Water&Wastewater,2016,32(21):114-118(in Chinese).
[10]Wei J J,Xu X H,Liu Y,et al.Catalytic hydrodechlorination of 2,4-dichlorophenol over nanoscale Pd/Fe:Reaction pathway and some experimental parameters[J].Water Res,2006,40(2):348-354.