水华束丝藻对汞的吸附-解吸特征
|
摘要
通过室内模拟实验,探究不同丰度的活、死水华束丝藻对Hg~(2+)的吸附动力学特征和等温吸附模型以及解吸特征。结果表明,水华束丝藻对Hg~(2+)有较好的吸附效果,能在短时间内吸附大量Hg~(2+),120 min左右达到吸附平衡,且活藻对Hg~(2+)的吸附效果比死藻好;活藻和死藻吸附Hg~(2+)的动力学过程符合准一级、准二级动力学模型,且准二级动力学模型拟合效果更好;活、死水华束丝藻对Hg~(2+)的吸附分别符合Langmuir模型、D-R模型,最大吸附量分别为2. 07×10~(-2)ng/(106 cells)、3. 56×10~(-2)ng/(10~6 cells);水华束丝藻对Hg~(2+)的单位吸附量随着藻丰度的增加而减少,吸附总量随着藻丰度的增加而增加。反应初期(0～5 min),活、死水华束丝藻对Hg~(2+)进行生物吸附,吸附速度快且效率高;随后活藻依靠新陈代谢将Hg~(2+)转移至细胞内进行生物富集,因而活藻的单位吸附量高于死藻。活藻和死藻对Hg~(2+)的解吸量随藻丰度的增加而增加,且死藻变化更明显。
Laboratory simulation experiments were conducted to investigate kinetics and isotherm patterns of sorption and desorption of Hg~(2+) by a biosorption agent,Aphanizomenon flosaquae,under different conditions,e. g. live or dead,and abundance. The results showed that algae,Aphanizomenon flosaquae,is a good sorbent for Hg~(2+) and can uptake a large amount of Hg~(2+) in a short time,sorption equilibria can be reached in about 120 minutes. The sorption ability of Hg~(2+) on live algae is much higher than that of dead algae. The sorption kinetics of Hg~(2+) by algae can be described with either quasi-first-order or quasi-second-order kinetic model. The quasi-secondary kinetic model showed a better fitting result. The sorption isotherms of Hg~(2+) by live algae and dead algae are consistent with the Langmuir model. The maximum sorption capacity of Hg~(2+) by live algae and dead algae was 2. 07×10~(-2) ng/(10~6 cells) and 3. 56×10~(-2) ng/( 10~6 cells),respectively. The concentration of Hg~(2+) on algae decreased while the total uptake amount of Hg~(2+) on algae increased as the abundance of algae increased. Both live and dead algae sorbed Hg~(2+) quickly and effectively within 5 min through biosorption,but the sorption amount of live algae was higher than that of dead algae since live algae can transfer Hg~(2+) into algae cell. The desorption amount of Hg~(2+) from live and dead algae increased with the increase of algae abundance,and this trend was more significant for dead algae.
Laboratory simulation experiments were conducted to investigate kinetics and isotherm patterns of sorption and desorption of Hg~(2+) by a biosorption agent,Aphanizomenon flosaquae,under different conditions,e. g. live or dead,and abundance. The results showed that algae,Aphanizomenon flosaquae,is a good sorbent for Hg~(2+) and can uptake a large amount of Hg~(2+) in a short time,sorption equilibria can be reached in about 120 minutes. The sorption ability of Hg~(2+) on live algae is much higher than that of dead algae. The sorption kinetics of Hg~(2+) by algae can be described with either quasi-first-order or quasi-second-order kinetic model. The quasi-secondary kinetic model showed a better fitting result. The sorption isotherms of Hg~(2+) by live algae and dead algae are consistent with the Langmuir model. The maximum sorption capacity of Hg~(2+) by live algae and dead algae was 2. 07×10~(-2) ng/(10~6 cells) and 3. 56×10~(-2) ng/( 10~6 cells),respectively. The concentration of Hg~(2+) on algae decreased while the total uptake amount of Hg~(2+) on algae increased as the abundance of algae increased. Both live and dead algae sorbed Hg~(2+) quickly and effectively within 5 min through biosorption,but the sorption amount of live algae was higher than that of dead algae since live algae can transfer Hg~(2+) into algae cell. The desorption amount of Hg~(2+) from live and dead algae increased with the increase of algae abundance,and this trend was more significant for dead algae.
引文
[1]冯新斌等著.乌江流域水库汞的生物地球化学过程及环境效应[M].北京:科学出版社,2015:1-378.
[2] Liu G,Cai Y,O’Driscoll N. Environmental chemistry and toxicology of mercury[M]. Hoboken:John Wiley&Sons,Inc.,2012:1-600.
[3] Harris H H,Pickering I J,George G N. The chemical form of mercury in fish[J]. Science,2003,301(5637):1203.
[4] Schartup A T,Qureshi A,Dassuncao C,et al. A model for methylmercury uptake and trophic transfer by marine plankton[J]. Environmental Science&Technology,2017,52(2):654-662.
[5] Morel F M M,Kraepiel A M L,Amyot M. The chemical cycle and bioaccumulation of mercury[J]. Annual Review of Ecology&Systematics,1998,29(29):543-566.
[6] Mergler D,Anderson H A,Chan L H,et al. Methylmercury exposure and health effects in humans:A worldwide concern[J]. Ambio,2007,36(1):3-11.
[7] Aksu Z,Egretli G,Kutsal T. A comparative study for the biosorption characteristics of chromium(VI)on ca-alginate,agarose and immobilized cvulgaris in a continuous packed bed column[J]. Environmental Letters,1999,34(2):295-316.
[8] Atkinson B W,Bux F,Kasan H C. Considerations for application of biosorption technology to remediate metal contaminated industrial effluents[J]. Water South Amerca,1998,24(2):129-135.
[9]黄慧. CPB改性沸石对低浓度含汞废水吸附解吸特性研究[D].重庆:西南大学,2013.
[10]李攀荣,邹长伟,万金保,等.微藻在废水处理中的应用研究[J].工业水处理,2016,36(5):5-9.
[11]孙荣国,范丽,尹晓刚,等.香蕉皮对汞的吸附特征研究[J].地球与环境,2018,46(5):498-504.
[12]胡琴,曹艳,张喆倩,等.不同微藻吸附重金属离子Cd2+的实验研究[J].上海环境科学,2017(4):179-184.
[13]陆开形,唐建军,蒋德安.藻类富集重金属的特点及其应用展望[J].应用生态学报,2006,17(1):118-122.
[14]金林,孙荣国,莫雅斐,等.椭圆小球藻对汞的吸附-解吸探究[J].地球与环境,2018,46(6):599-605.
[15]申禹,李玲.天然水体中生物膜对磷的吸附动力学特征[J].环境科学学报,2013,33(4):1023-1027.
[16] US EPA. Method 1631:Mercury in water by oxidation,purge and trap,and cold vapor atomic fluorescence spectrometry[S]. Washington,D C,2002.
[17] Costa M,Liss P S. Photoreduction of mercury in sea water and its possible implications for Hg0air–sea fluxes[J]. Marine Chemistry,1999,68(1-2):87-95.
[18]邓南圣,吴峰.环境光化学[M].北京:化学工业出版社,2003.
[19]阴永光,李雁宾,蔡勇.汞的环境光化学[J].环境化学,2011,30(1):84-91.
[20] Malik A. Metal bioremediation through growing cells[J]. Environment International,2004,30(2):261-278.
[21] Monteiro C M,Castro P M,Malcata F X. Metal uptake by microalgae:Underlying mechanisms and practical applications[J]. Biotechnology Progress,2012,28(2):299-311.
[22]郑蒙蒙,邵鲁泽,管幼青,等.藻类富集水体重金属的机理及应用[J].环境科技,2017(6):66-70.
[2] Liu G,Cai Y,O’Driscoll N. Environmental chemistry and toxicology of mercury[M]. Hoboken:John Wiley&Sons,Inc.,2012:1-600.
[3] Harris H H,Pickering I J,George G N. The chemical form of mercury in fish[J]. Science,2003,301(5637):1203.
[4] Schartup A T,Qureshi A,Dassuncao C,et al. A model for methylmercury uptake and trophic transfer by marine plankton[J]. Environmental Science&Technology,2017,52(2):654-662.
[5] Morel F M M,Kraepiel A M L,Amyot M. The chemical cycle and bioaccumulation of mercury[J]. Annual Review of Ecology&Systematics,1998,29(29):543-566.
[6] Mergler D,Anderson H A,Chan L H,et al. Methylmercury exposure and health effects in humans:A worldwide concern[J]. Ambio,2007,36(1):3-11.
[7] Aksu Z,Egretli G,Kutsal T. A comparative study for the biosorption characteristics of chromium(VI)on ca-alginate,agarose and immobilized cvulgaris in a continuous packed bed column[J]. Environmental Letters,1999,34(2):295-316.
[8] Atkinson B W,Bux F,Kasan H C. Considerations for application of biosorption technology to remediate metal contaminated industrial effluents[J]. Water South Amerca,1998,24(2):129-135.
[9]黄慧. CPB改性沸石对低浓度含汞废水吸附解吸特性研究[D].重庆:西南大学,2013.
[10]李攀荣,邹长伟,万金保,等.微藻在废水处理中的应用研究[J].工业水处理,2016,36(5):5-9.
[11]孙荣国,范丽,尹晓刚,等.香蕉皮对汞的吸附特征研究[J].地球与环境,2018,46(5):498-504.
[12]胡琴,曹艳,张喆倩,等.不同微藻吸附重金属离子Cd2+的实验研究[J].上海环境科学,2017(4):179-184.
[13]陆开形,唐建军,蒋德安.藻类富集重金属的特点及其应用展望[J].应用生态学报,2006,17(1):118-122.
[14]金林,孙荣国,莫雅斐,等.椭圆小球藻对汞的吸附-解吸探究[J].地球与环境,2018,46(6):599-605.
[15]申禹,李玲.天然水体中生物膜对磷的吸附动力学特征[J].环境科学学报,2013,33(4):1023-1027.
[16] US EPA. Method 1631:Mercury in water by oxidation,purge and trap,and cold vapor atomic fluorescence spectrometry[S]. Washington,D C,2002.
[17] Costa M,Liss P S. Photoreduction of mercury in sea water and its possible implications for Hg0air–sea fluxes[J]. Marine Chemistry,1999,68(1-2):87-95.
[18]邓南圣,吴峰.环境光化学[M].北京:化学工业出版社,2003.
[19]阴永光,李雁宾,蔡勇.汞的环境光化学[J].环境化学,2011,30(1):84-91.
[20] Malik A. Metal bioremediation through growing cells[J]. Environment International,2004,30(2):261-278.
[21] Monteiro C M,Castro P M,Malcata F X. Metal uptake by microalgae:Underlying mechanisms and practical applications[J]. Biotechnology Progress,2012,28(2):299-311.
[22]郑蒙蒙,邵鲁泽,管幼青,等.藻类富集水体重金属的机理及应用[J].环境科技,2017(6):66-70.