茶渣修饰磁性Fe_3O_4纳米粒子协同吸附铜铅离子的研究
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摘要
在茶渣上通过化学共沉淀制备环境友好、价格低廉的磁性纳米粒子Fe_3O_4-茶复合物。结果显示,茶渣修饰提高了磁性Fe_3O_4纳米粒子(Fe_3O_4MNPs)在水中的分散性和稳定性,促进了Fe_3O_4MNPs对水中重金属的去除能力;Cu(Ⅱ)和Pb(Ⅱ)的吸附归因于Fe_3O_4-茶复合物中丰富的结合位点(如—OH,—COOH和—NH—)与Cu(Ⅱ)和Pb(Ⅱ)形成稳定的络合物。在pH为7.0,Cu(Ⅱ)、Pb(Ⅱ)初始质量浓度为100mg/L,吸附时间为2h时,Fe_3O_4-茶复合物对Cu(Ⅱ)、Pb(Ⅱ)的吸附率分别为94.58%、94.28%;Cu(Ⅱ)、Pb(Ⅱ)的吸附过程符合准二级动力学方程,Fe_3O_4-茶复合物在连续4次循环再生后,仍表现出较好的吸附能力。利用柱吸附法考察了进液流速对穿透曲线的影响,结果表明:随进液流速增加,穿透点前移,且Cu(Ⅱ)的吸附能力低于Pb(Ⅱ)的吸附能力。
An environmentally friendly and inexpensive magnetic nanoparticle Fe_3O_4-tea composite was prepared by chemical co-precipitation on tea leaf.The results showed that the tea modification improved the dispersibility and stability of magnetic Fe_3O_(4 )nanoparticles(Fe_3O_4MNPs)in water,and promoted the removal of heavy metals from water by Fe_3O_4MNPs.The adsorption of Cu(Ⅱ)and Pb(Ⅱ)was attributed to the abundant binding sites(such as—OH,—COOH and—NH—)in the Fe_3O_4-tea composite which could form stable complexes with Cu(Ⅱ)and Pb(Ⅱ).When the initial mass concentration of Cu(Ⅱ)and Pb(Ⅱ)was 100mg/L at pH 7.0and the adsorption time was 2h,the adsorption rates of Fe_3O_4-tea composite on Cu(Ⅱ)and Pb(Ⅱ)were 94.58%and94.28%,respectively.The adsorption process of Cu(Ⅱ)and Pb(Ⅱ)accorded with the quasi-second-order kinetics equation,and Fe_3O_4-tea composite still exhibited high adsorption capacity after 4cycles of regeneration.The effect of the inlet flow rate on the breakthrough curve was investigated by column adsorption method.The results showed that the penetration point advanced with the increase of the inlet flow rate,and the adsorption capacity of Cu(Ⅱ)was lower than that of Pb(Ⅱ).
An environmentally friendly and inexpensive magnetic nanoparticle Fe_3O_4-tea composite was prepared by chemical co-precipitation on tea leaf.The results showed that the tea modification improved the dispersibility and stability of magnetic Fe_3O_(4 )nanoparticles(Fe_3O_4MNPs)in water,and promoted the removal of heavy metals from water by Fe_3O_4MNPs.The adsorption of Cu(Ⅱ)and Pb(Ⅱ)was attributed to the abundant binding sites(such as—OH,—COOH and—NH—)in the Fe_3O_4-tea composite which could form stable complexes with Cu(Ⅱ)and Pb(Ⅱ).When the initial mass concentration of Cu(Ⅱ)and Pb(Ⅱ)was 100mg/L at pH 7.0and the adsorption time was 2h,the adsorption rates of Fe_3O_4-tea composite on Cu(Ⅱ)and Pb(Ⅱ)were 94.58%and94.28%,respectively.The adsorption process of Cu(Ⅱ)and Pb(Ⅱ)accorded with the quasi-second-order kinetics equation,and Fe_3O_4-tea composite still exhibited high adsorption capacity after 4cycles of regeneration.The effect of the inlet flow rate on the breakthrough curve was investigated by column adsorption method.The results showed that the penetration point advanced with the increase of the inlet flow rate,and the adsorption capacity of Cu(Ⅱ)was lower than that of Pb(Ⅱ).
引文
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[3] WIRTH J J,MIJAL R S.Adverse effects of low level heavy metal exposure on malereproductive function[J].Systems Biology in Reproductive Medicine,2010,56(2):147-167.
[4] BURAKOV A E,GALUNIN EV,BURAKOVA I V,et al.Adsorption of heavy metals on conventional and nanostructured materials for wastewater treatment purposes:review[J].Ecotoxicology and Environmental Safety,2018,148(1):702-712.
[5] MAITY D,AGRAWAL D C.Synthesis of iron oxide nanoparticles under oxidizing environment and their stabilization in aqueous and non-aqueous media[J].Journal of Magnetism&Magnetic Materials,2007,308(1):46-55.
[6] WEN T,WANG X X,WANG J,et al.A strategically designed porous magnetic N-doped Fe/Fe3C@C matrix and its highly efficient uranium(Ⅵ)remediation[J].Inorganic Chemistry Frontiers,2016,3(10):1227-1235.
[7]谈昭君,王毅,刘静晨,等.共沉淀法磁性纳米粒子Fe3O4的制备及性能研究[J].当代化工,2015,44(9):2094-2096.
[8]MAALOUL N,OULEGO P,RENDUELES M,et al.Novel biosorbents from almond shells:characterization and adsorption properties modeling for Cu(Ⅱ)ions from aqueous solutions[J].Journal of Environmental Chemical Engineering,2017,5(3):2944-2954.
[9] DING C C,CHENG WC,SUN Y B,et al.Novel fungus-Fe3O4bio-nanocomposites as high performance adsorbents for the removal of radionuclides[J].Journal of Hazardous Materials,2015,295(7):127-137.
[10] UDDIN M T,ISLAM M A,MAHMUD S.et al.Adsorptive removal of methylene blue by tea waste[J].Journal of Hazardous Materials,2009,164(1):53-60.
[11] ZHANG D H,LIU Z Q,HAN S,et al.Magnetite(Fe3O4)core-shell nanowires and nanotubes:synthesis and magnetoresistance[J].Nano Letters,2004,4(11):2151-2155.
[12] YEN C H,LIEN H L,CHUNG J S,et al.Adsorption of precious metals in water by dendrimer modified magnetic nanoparticles[J].Journal of Hazardous Materials,2017,322:215-222.
[13] LAI Y L,THIRUMAVALAVAN M,LEE J F.Effective adsorption of heavy metal ions(Cu2+,Pb2+,Zn2+)from aqueous solution by immobilization of adsorbents on Ca-alginate beads[J].Toxicological&Environmental Chemistry,2010,92(4):697-705.
[14] MONDAL M K.Removal of Pb(Ⅱ)ions from aqueous solution using activated tea waste:adsorption on a fixed-bed column[J].Journal of Environmental Management,2009,90(2):3266-3271.
[15] LIU Z J,LI D X,DAI H J,et al.Enhanced properties of tea residue cellulose hydrogels by addition of graphene oxide[J].Journal of Molecular Liquids,2017,244(8):110-116.
[16] BRAHIM S E,SULAYMON A H,ALHARES H S.Competitive removal of Cu2+,Cd2+,Zn2+,and Ni 2+ions onto iron oxide nanoparticles from wastewater[J].Desalination and Water Trestment,2015,57(16):1-15.
[17] LIN S,XU M,ZHANG W,et al.Quantitative effects of amination degree on the magnetic iron oxide nanoparticles(MIONPs)using as adsorbents to remove aqueous heavy metal ions[J].Journal of Hazardous Materials,2017,335:47-55.