水葫芦根粉对水环境中钒的吸附
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摘要
通过批量吸附实验研究了水葫芦根粉作为水环境中钒吸附材料的可行性。分别探索了初始V~(5+)浓度、pH、水葫芦根粉用量和吸附时间对水葫芦根粉吸附钒的影响。结果表明,随着初始V5+浓度的增加和吸附时间的延长,水葫芦根粉对钒的吸附量均呈先增大后保持稳定的趋势。pH对水葫芦根粉吸附钒的影响显著,酸性条件更有利于吸附。当水葫芦根粉用量由25mg增至300mg时,其对钒的吸附量呈下降趋势。水葫芦根粉对钒的吸附过程符合Freundlich方程和准二级动力学模型,表明该过程以化学吸附为主,且钒易被水葫芦根粉吸附。
Batch adsorption experiments were carried out to study the feasibility of Eichhornia crassipes root powder as an adsorbent to remove vanadium from aqueous environment.The effects of initial V~(5+) concentration,solution pH,dosage of Eichhornia crassipes root powder and reaction time on removal of vanadium were explored,respectively.The results showed that:(1)with the increase of initial V~(5+) concentration and reaction time,adsorption capacity of vanadium by Eichhornia crassipes root powder increased and then reached equilibrium.(2)Solution pH had a great effect on vanadium adsorption by Eichhornia crassipes root powder,and acid environment was favorable to adsorption process.(3)Adsorption capacity decreased with the dosage of root powder increased from 25 mg to 300 mg.(4)Freundlich and pseudo-second-kinetic models could describe the adsorption process well,indicating that the adsorption process was spontaneous,and chemical reaction was the dominated process.
Batch adsorption experiments were carried out to study the feasibility of Eichhornia crassipes root powder as an adsorbent to remove vanadium from aqueous environment.The effects of initial V~(5+) concentration,solution pH,dosage of Eichhornia crassipes root powder and reaction time on removal of vanadium were explored,respectively.The results showed that:(1)with the increase of initial V~(5+) concentration and reaction time,adsorption capacity of vanadium by Eichhornia crassipes root powder increased and then reached equilibrium.(2)Solution pH had a great effect on vanadium adsorption by Eichhornia crassipes root powder,and acid environment was favorable to adsorption process.(3)Adsorption capacity decreased with the dosage of root powder increased from 25 mg to 300 mg.(4)Freundlich and pseudo-second-kinetic models could describe the adsorption process well,indicating that the adsorption process was spontaneous,and chemical reaction was the dominated process.
引文
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[2]NRIAGU J O.Vanadium in the environment,Part 1:chemistry and biochemistry[M].New York:John Wiley&Sons,1998.
[3]田茂明,唐大均,张奇,等.含钒钢渣提钒工艺及其主要技术[J].重庆科技学院学报(自然科学版),2009,11(2):59-60.
[4]FANG D,ZHANG X F,DONG M G,et al.A novel method to remove chromium,vanadium and ammonium from vanadium industrial wastewater using a byproduct of magnesium-based wet flue gas desulfurization[J].Journal of Hazardous Materials,2017,336:8-20.
[5]GUMMOW B.Vanadium:environmental pollution and health effects[J].Encyclopedia of Environmental Health,2011:628-636.
[6]LUO L,LIU K,SHIBAYAMA A,et al.Recovery of tungsten and vanadium from tungsten alloy scrap[J].Hydrometallurgy,2004,72(1/2):1-8.
[7]HU J,WANG X,XIAO L,et al.Removal of vanadium from molybdate solution by ion exchange[J].Hydrometallurgy,2009,95(3/4).
[8]YU Y Q,WEI Q Q,LI J X,et al.Removal of vanadium from wastewater by multi-walled carbon nanotubes[J].Fullerenes Nanotubes and Carbon Nanostructures,2017,25(3).
[9]司士辉,赵坤,李凌璞,等.D301大孔树脂吸附钒(Ⅴ)的性能研究[J].离子交换与吸附,2009,25(6):511-518.
[10]王鲲鹏,李科,廖维,等.13X分子筛对水体中钒离子的吸附[J].环境工程学报,2016,10(11).
[11]NAEEM A,WESTERHOFF P,MUSTAFA S.Vanadium removal by metal(hydr)oxide adsorbents[J].Water Research,2007,41(7).
[12]达良俊,陈鸣.凤眼莲不同部位对重金属的吸收、吸附作用研究[J].上海环境科学,2003,22(11):765-767.
[13]复旦大学.物理化学实验[M].2版.北京:高等教育出版社,1993.
[14]IQBAL M,SAEED A,ZAFAR S I.FTIR spectrophotometry,kinetics and adsorption isotherms modeling,ion exchange,and EDX analysis for understanding the mechanism of Cd2+and Pb2+removal by mango peel waste[J].Journal of Hazardous Materials,2009,164(1):161-171.
[15]李广池.利用磷酸—钨酸钠光度法测定水中的钒[J].山西煤炭管理干部学院学报,2011,24(1):141-143.
[16]李强.紫根凤眼莲对水中四种重金属的去除机理研究[D].昆明:昆明理工大学,2015.
[17]明桂花,刘晶晶,那郅烨.紫根水葫芦干根粉吸附剂表面特征及吸砷(As)特性[J].绿色科技,2015(7).
[18]谭彩云,林玉满,陈祖亮.凤眼莲净化水中重金属的研究[J].亚热带资源与环境学报,2009,4(1).
[19]周晓勇,田亚运,张举斌.水葫芦对水溶液中Cu2+、Zn2+的吸附[J].湿法冶金,2015(1):60-67.
[20]刘梦,王华静,王鲲鹏,等.腐殖酸对水体中五价钒的吸附[J].农业环境科学学报,2016,35(5):969-975.
[21]MTHOMBENI N H,MBAKOP S,OCHIENG A,et al.Vanadium(Ⅴ)adsorption isotherms and kinetics using polypyrrole coated magnetized natural zeolite[J].Journal of the Taiwan Institute of Chemical Engineers,2016,66:172-180.
[22]OSHIMA T,SAKAMOTO T,OHE K,et al.Cellulose aerogel regenerated from ionic liquid solution for immobilized metal affinity adsorption[J].Carbohydrate Polymers,2014,103:62-69.