沉水植物菹草改性后对Cr(Ⅵ)的吸附研究
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摘要
为开发廉价高效去除水中重金属Cr(Ⅵ)污染的生物吸附剂,在以沉水植物菹草固形物作为吸附剂研究的基础上,对菹草进行改性以提高吸附性能,并以其为吸附剂进行吸附实验。改性菹草对Cr(Ⅵ)的去除率最高为99.6%,其对Cr(Ⅵ)的吸附动力学符合准二级动力学方程,吸附等温线符合Langmuir吸附等温线,最大吸附量可达64.5 mg/g,与未改性的菹草相比,最大吸附量提高了84.3%。
In order to develop low-cost and efficient biosorbents which can remove heavy metal Cr(Ⅵ) pollution from water, and based on the research of submerged plant Potamogeton crispus solid-shaped material as adsorbent,Potamogeton crispus has been modified to improve its adsorption capability. Adsorption experiments on this adsorbent have been accomplished. The maximum removing rate of Cr( Ⅵ) by modified Potamogeton crispus is 99.6%. The Cr(Ⅵ) adsorption kinetics complies with the pseudo second-order kinetics equation and the adsorption isotherm complies with Langmuir isotherm model. Its maximum adsorption capacity can reach 64.5 mg/g. Compared with unmodi-fied Potamogeton crispus,the maximum adsorption capacity is increased by 84.3%.
In order to develop low-cost and efficient biosorbents which can remove heavy metal Cr(Ⅵ) pollution from water, and based on the research of submerged plant Potamogeton crispus solid-shaped material as adsorbent,Potamogeton crispus has been modified to improve its adsorption capability. Adsorption experiments on this adsorbent have been accomplished. The maximum removing rate of Cr( Ⅵ) by modified Potamogeton crispus is 99.6%. The Cr(Ⅵ) adsorption kinetics complies with the pseudo second-order kinetics equation and the adsorption isotherm complies with Langmuir isotherm model. Its maximum adsorption capacity can reach 64.5 mg/g. Compared with unmodi-fied Potamogeton crispus,the maximum adsorption capacity is increased by 84.3%.
引文
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[2]郭峰.含铬(Ⅵ)废水无害化处理技术研究进展[J].中国资源综合利用,2017,35(8):62-65.
[3]孟超,孟庆庆.化学沉淀法处理含铬电镀废水的工程应用研究[J].环境科学与管理,2013,38(4):106-110.
[4]宋秀玲,钱会,刘小丽,等.离子交换树脂吸附铬(Ⅵ)的热力学和动力学研究[J].应用化工,2013,42(1):99-101.
[5]黄婕,李超,杨俊和.纳滤膜处理含铬废水溶液的研究[J].化学工程,2013,41(5):64-68.
[6]Torabmostaedi M,Asadollahzadeh M,Hemmati A,et al.Biosorption of lanthanum and cerium from aqueous solutions by grapefruit peel:equilibrium,kinetic and thermodynamic studies[J].Research on Chemical Intermediates,2013,41(2):559-573.
[7]López-Téllez G,Barrera-Díaz C E,Balderas-Hernández P,et al.Removal of hexavalent chromium in aquatic solutions by iron nanoparticles embedded in orange peel pith[J].Chemical Engineering Journal,2011,173(2):480-485.
[8]赵强,薛雅荣,白玉龙,等.改性玉米秸秆吸附Cu2+的研究[J].化工新型材料,2016,44(5):215-217.
[9]任一丹,王爱丽.生物吸附剂菹草干粉对Cr(Ⅵ)的吸附性能[J].应用化学,2015,32(7):825-830.
[10]鲁敏,袁雪平,李房玉.纤维素的改性及对重金属离子去除的研究进展[J].硅酸盐通报,2016,35(5):1509-1513.
[11]国家环保总局.水和废水监测分析方法[M].4版.北京:中国环境科学出版社,2002:346-349.
[12]Agarwal G S,Bhuptawat H K,Chaudhari S.Biosorption of aqueous chromium(Ⅵ)by Tamarindus indica seeds[J].Bioresource Technology,2006,97(7):949-956.
[13]Hasan S H,Singh K K,Prakash O,et al.Removal of Cr(Ⅵ)from aqueous solutions using agricultural waste‘maize bran’[J].Journal of Hazardous Materials,2008,152(1):356-365.
[14]鲁秀国,段建菊,唐朝春.氯化锌造孔壳炭对Cr(Ⅵ)的吸附研究[J].工业水处理,2017,37(6):90-94.
[15]陈小萍,黄莎莎,刘毕华,等.活性炭纤维对水中Cr(Ⅵ)的吸附研究[J].化工新型材料,2016,44(4):182-183.
[16]孟祥霞,邬欣慧,马东,等.水热改性花生壳对水中Cr(Ⅵ)的吸附性能[J].工业水处理,2017,37(10):52-56.
[17]Garg U K,Kaur M P,Garg V K,et al.Removal of hexavalent chromium from aqueous solution by agricultural waste biomass[J].Journal of Hazardous Materials,2007,140(1/2):60-68.
[18]张敬华,张军丽,张宏,等.花生壳对水体中罗丹明B的生物吸附性能[J].化学试剂,2013,35(11):1031-1033.