羧甲基纤维素钠稳定纳米硫化亚铁吸附砷研究
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摘要
研究利用羧甲基纤维素钠(CMC)作为稳定剂,采用均相沉淀法制备FeS纳米粒子,采用透射电子显微镜、X射线衍射仪、傅立叶变换红外光谱仪、X射线光电子能谱等方法对其进行表征,并讨论了对水中As(V)吸附性能的影响因素。结果表明,吸附量随CMC投加量增加而增加,CMC、FeS在质量比为1:1时,吸附量最大;对于50 mL初始质量浓度为10 mg/L的As(V)溶液,CMC-FeS适宜投加量为5 mg,在反应时间达到3 h即达到平衡,As去除率达到99%以上;pH在2～9时去除率均能达到80%以上,pH在5左右去除效果为好;吸附过程符合准2级动力学方程和Freundlich等温方程。说明稳定的纳米硫化亚铁是一种高效的除砷材料。
The FeS nanoparticles were prepared by homogeneous precipitation method using carboxymethyl cellulose sodium(CMC) as stabilizing agent.The characteristics were analyzed by TEM, XRD, XRF, FTIR and XPS, the influence factors on adsorption properties of As(V) were studied. The results showed that, the adsorption quantity improved with the increase of CMC dosage, and the adsorption capacity was the largest when the mass ratio of CMC,FeS was 1:1. The optimum dosage of CMC-FeS was 5 mg when the initial mass concentration of As(V) was 10 mg/L in the 50 mL As(V) solution, and the removal rate of As was over 99% when the reaction achieved balance after 3 h. The removal rate of As was above 80% when p H in the range of 2～9,and the removal efficiency was best when p H was 5. The adsorption process was established by the pseudo-second kinetic equation and the Freundlich isothermal equation. This experiment showed that the stable nano-FeS is an efficient arsenic removal material.
The FeS nanoparticles were prepared by homogeneous precipitation method using carboxymethyl cellulose sodium(CMC) as stabilizing agent.The characteristics were analyzed by TEM, XRD, XRF, FTIR and XPS, the influence factors on adsorption properties of As(V) were studied. The results showed that, the adsorption quantity improved with the increase of CMC dosage, and the adsorption capacity was the largest when the mass ratio of CMC,FeS was 1:1. The optimum dosage of CMC-FeS was 5 mg when the initial mass concentration of As(V) was 10 mg/L in the 50 mL As(V) solution, and the removal rate of As was over 99% when the reaction achieved balance after 3 h. The removal rate of As was above 80% when p H in the range of 2～9,and the removal efficiency was best when p H was 5. The adsorption process was established by the pseudo-second kinetic equation and the Freundlich isothermal equation. This experiment showed that the stable nano-FeS is an efficient arsenic removal material.
引文
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[2]SMEDLEY P L,KINNIBURGH D G.A review of the source,behaviour and distribution of arsenic in natural waters[J].Applied Geochemistry,2002,17(5):517-568.
[3]KANEL S R,GREN魬CHE,J M,CHOI H.Arsenic(V)removal from groundwater using nano scale zero-valent iron as a colloidal reactive barrier material[J].Environmental Science&Technology,2006,40(6):2045-2050.
[4]CHOONG T S Y,CHUAH T G,ROBIAH Y,et al.Arsenic toxicity,health hazards and removal techniques from water:an overview[J].Desalination,2007,217(1):139-166.
[5]FENG J,ZHU B W,LIM T T.Reduction of chlorinated methanes with nano-scale Fe particles:effects of amphiphiles on the dechlorination reaction and two-parameter regression for kinetic prediction[J].Chemosphere,2008,73(11):1817-1823.
[6]GIASUDDIN A B,KANEL S R,CHOI H.Adsorption of humic acid onto nanoscale zerovalent iron and its effect on arsenic removal[J].Environmental Science&Technology,2007,41(6):2022-2027.
[7]GIASUDDIN A B,KANEL S R,CHOI H.Adsorption of humic acid onto nanoscale zerovalent iron and its effect on arsenic removal[J].Environmental Science&Technology,2007,41(6):2022-2027.
[8]HE F,ZHAO D.Hydrodechlorination of trichloroethene using stabilized Fe-Pd nanoparticles:Reaction mechanism and effects of stabilizers,catalysts and reaction conditions[J].Applied Catalysis BEnvironmental,2008,84(3):533-540.
[9]Chen W,Duan L,Zhu D.Adsorption of polar and nonpolar organic chemicals to carbon nanotubes[J].Environmental Science&Technology,2007,41(24):8295-8300.
[10]NIANQIANG WU,FU L,SU M,et al.Interaction of fatty acid monolayers with cobalt nanoparticles[J].Nano Letters,2015,4(2):383-386.
[11]DEACON G B,PHILLIPS R J.Relationships between the carbonoxygen stretching frequencies of carboxylato complexes and the type of carboxylate coordination[J].Coordination Chemistry Reviews,1980,33(3):227-250.
[12]HE F,ZHAO D Y,LIU J C,et al.Stabilization of Fe-Pd nanoparticles with sodium carboxymethyl cellulose for enhanced transport and dechlorination of trichloroethylene in soil and groundwater[J].Industrial&Engineering Chemistry Research,2007,46(46):29-34.
[13]SYLVESTRE J P,SACHER E,MEUNIER M.Stabilization and size control of gold nanoparticles during laser ablation in aqueous cyclodextrins[J].Journal of the American Chemical Society,2004,126(23):7176-7177.
[14]生活饮用水卫生标准:GB 5749-2006[S].
[15]STANFORTH R.Comment on"Arsenite and arsenate adsorption on ferrihydrite:Surface charge reduction and net OH-release stoichiometry"[J].Environmental Science&Technology,1999,33(8):3696.
[16]ANAWAR H M,AKAI J,SAKUGAWA H.Mobilization of arsenic from subsurface sediments by effect of bicarbonate ions in groundwater[J].Chemosphere,2004,54(6):753-762.
[17]江元汝,黄琼玉.硫化亚铁处理含砷废水中砷的形态变化[J].环境化学,1996(2):118-126.
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