采用溶剂热法和沉淀沉积法成功制备锆化碳基磁性纳米复合材料，利用TEM、XRD、VSM 和 XRF手段对其结构特性进行表征，并研究其对水体中重金属Pb2＋的吸附行为．表征结果表明，锆修饰的碳基磁性纳米材料是核壳球形结构，具有良好的超顺磁性，在外加磁场的作用下可实现快速分离．吸附实验结果表明，材料对Pb2＋的吸附量随着锆负载量的提高而增多．Pb2＋在材料上的吸附等温线符合Freundlich等温吸附模式，属于优惠型吸附；降低离子强度和增加pH均可提高材料对Pb2＋的吸附作用．材料脱附再生6次之后仍具有良好的吸附效果．
Zirconia functionalized carbon?based magnetic nanocomposite ( denoted as Fe3 O4@C?Zr) was successfully synthesized by the hydrothermal and precipitation deposition method. The adsorbents were characterized by TEM, XRD, VSM and XRF, and their adsorption behavior for Pb2+ in water was investigated. Characterization results showed that Fe3 O4@ C?Zr had a core?shell spherical structure and could be rapidly separated under an external magnetic field because of its superparamagnetism. Adsorption experimental results showed that Pb2+ adsorption increased with ZrO2 deposition. And the adsorption isotherm could be well described by the Freundlich adsorption model, indicative of a preferential adsorption. Additionally, low ionic strength and high pH favored the adsorption of Pb2+. After six adsorption?desorption cycles, the adsorbent still displayed good adsorption capacity.
参考文献
| [1] | Li Y H;Ding J;Luan Z K.Competitive adsorption of Pb,Cu and Cd ions from aqueous solutions by multiwalled carbon nanotubes[J].CARBON,2003(41):2787-2792. |
| [2] | 李雅,汪葵,吴奇,金文,刘晓宁,李瑞娟.零价铁修复铅污染水体的研究[J].电镀与环保,2014(03):47-49. |
| [3] | KOON FUNG LAM;KING LUN YEUNG;GORDON MCKAY .Efficient Approach for Cd~(2+) and Ni~(2+) Removal and Recovery Using Mesoporous Adsorbent with Tunable Selectivity[J].Environmental Science & Technology: ES&T,2007(9):3329-3334. |
| [4] | Heidari A;Younesi H;Mehraban Z.Removal of Ni(Ⅱ), Cd(Ⅱ), and Pb(Ⅱ) from a ternary aqueous solution by amino functionalized mesoporous and nano mesoporous silica[J].CHEMICAL ENGINEERING JOURNAL,2009(153):70-79. |
| [5] | Kadirvelu K;Namasivayam C.Activated carbon from coconut coirpith as metal adsorbent:Adsorption of Cd(Ⅱ) from aqueous solution[J].Advances in Envionmental Research,2003(7):471-478. |
| [6] | Kobya M;Demirbas E;Senturk E;Ince M .Adsorption of heavy metal ions from aqueous solutions by activated carbon prepared from apricot stone[J].Bioresource Technology: Biomass, Bioenergy, Biowastes, Conversion Technologies, Biotransformations, Production Technologies,2005(13):1518-1521. |
| [7] | Erdem E;Karapinar N;Donat R .The removal of heavy metal cations by natural zeolites[J].Journal of Colloid and Interface Science,2004(2):309-314. |
| [8] | Rafael Celis;M. Carmen Hermosin;Juan Cornejo .Heavy metal adsorption by functionalized clays[J].Environmental Science & Technology: ES&T,2000(21):4593-4599. |
| [9] | Cortina J;Miralles N.Kinetic studies on heavy metal ions removal by impregnated resins containing di-(2,4,4-trymethylpentyl) phosphinic acid[J].SOLVENT EXTRACTION AND ION EXCHANGE,1997(15):1067-1083. |
| [10] | 王家宏,常娥,丁绍兰,韩晓晶.ZrO2负载碳纳米管吸附去除水中氟的研究[J].离子交换与吸附,2012(01):62-69. |
| [11] | Hua M;Jiang Y N;Wu B.Fabrication of a new hydrous Zr(Ⅳ) oxide-based nanocomposite for enhanced Pb(Ⅱ) and Cd(Ⅱ) removal from waters[J].Applied Materials& Interfaces,2013(5):12135-12142. |
| [12] | 张春荣,闫李霞,申大忠,陈令新.Fe_3O_4/C纳米粒子的制备及其对水中罗丹明B的去除[J].环境化学,2012(11):1669-1675. |
| [13] | 张巧丽,陈旭,袁彪.磁性氧化铁/活性炭复合吸附剂的制备及性能[J].天津大学学报,2005(04):361-364. |
| [14] | Maiyong Zhu;Chengjiao Wang;Dehai Meng .In situ synthesis of silver nanostructures on magnetic Fe3O4@C core-shell nanocomposites and their application in catalytic reduction reactions[J].Journal of Materials Chemistry, A. Materials for energy and sustainability,2013(6):2118-2125. |
| [15] | Hong Deng;Xiaolin Li;Qing Peng;Xun Wang;Jinping Chen;Yadong Li .Monodisperse Magnetic Single-Crystal Ferrite Microspheres[J].Angewandte Chemie,2005(18):2782-2785. |
| [16] | 宗恩敏,魏丹,还中科,彭渡,万海勤,郑寿荣,许昭怡.磷在氧化锆-碳纳米管复合材料上的吸附研究[J].无机化学学报,2013(05):965-972. |
| [17] | Liu Y;Gao J;Li C X et al.Synthesis and adsorption performance of surface-grafted Co(Ⅱ)-imprinted polymer for selective removal of cobalt[J].Chinese Journal of Chemistry,2010,28(4):548-554. |
| [18] | Ana M. Carmo;Lakhwinder S. Hundal;Michael L. Thompson .Sorption of hydrophobic organic compounds by soil materials: application of unit equivalent Freundlich coefficients[J].Environmental Science & Technology: ES&T,2000(20):4363-4369. |
| [19] | Hsia T H;Lo S L;Lin C F et al.Characterization of arsenate adsorption on hydrous iron oxide using chemical and physical methods[J].Colloids and Surfaces A-Physicochemical and Engineering Aspects,1994,85(01):1-7. |
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