摘要
以硝酸铁和十二烷基三甲基溴化铵为原料,采用固相法制备了γ-氧化铁纳米粒子。通过X射线衍射、氮气吸附-脱附、磁性测试等手段对γ-氧化铁样品进行了表征。研究了γ-氧化铁对有机染料直接耐酸大红4BS的吸附性能。结果表明,制备的γ-氧化铁样品为γ-氧化铁纳米粒子,平均晶粒尺寸为18.5 nm;γ-氧化铁的比表面积为83.2 m~2/g,孔容为0.25 cm~3/g,最可几孔径为3.8 nm,属于介孔范围;γ-氧化铁的最大饱和磁化强度为63.7 A·m~2/kg;介孔γ-氧化铁对直接耐酸大红4BS的吸附过程符合准二级吸附动力学模型;γ-氧化铁对直接耐酸大红4BS的吸附符合Langmuir吸附等温式,极限吸附量为113.3 mg/g;将γ-氧化铁脱附处理后可重复使用。
Fe_2O_3 nanoparticles were prepared by a solid phase method using ferric nitrate [Fe(NO_3)_3·9H_2O] and dodecyl trimethylammonium bromide(DTAB) as raw materials.The sample was characterized by X-ray diffraction(XRD),N_2 adsorption-desorption(BET) and vibrating-sample magnetometer(VSM),and its adsorption ability for direct acid-resistant red 4BS was also studied.The results showed that the prepared γ-Fe_2O_3 sample was γ-Fe_2O_3 nanoparticles with an average crystallite size of 18.5 nm,a specific surface area of 83.2 m~2/g,the pore volume was 0.25 cm~3/g and the most probable pore size was 3.8 nm which belonged to the mesoporous range.The maximum saturation magnetization(Ms) of γ-Fe_2O_3 was 63.7 A·m~2/kg.The adsorption process of mesoporous γ-Fe_2O_3 on direct acid-resistant red 4BS conformed to the quasi-secondary adsorption kinetics model.The adsorption process of γ-Fe_2O_3 on direct acid-resistant red 4BS also fitted well with Langmuir isotherm model and its maximum adsorption capacity was estimated to be 113.3 mg/g,and the γ-Fe_2O_3 nanoparticles could be reusable.
引文
[1]滕沙沙,李碧.凹凸棒石/γ-Fe2O3/碳纳米复合材料吸附有机物污染物研究[J].广州化工,2013,41(11):111-113,145.
[2]米敬,李北罡.不同粉煤灰对弱酸性深蓝5R的吸附性能研究[J].内蒙古农业大学学报:自然科学版,2014,35(4):64-70.
[3]彭书传,王诗生,陈天虎,等.凹凸棒石吸附水溶性染料的热力学研究[J].硅酸盐学报,2005,33(8):1012-1017.
[4]张腾,王勇梅,彭昌盛,等.染料废水的处理方法及研究进展[J].环保科技,2016,22(1):36-40.
[5]霍晓源,黄小惠.对染料废水处理技术的几点探讨[J].资源节约与环保,2015(6):59.
[6]李乐,成彬,廖琪,等.吸附法提取低浓度铀的研究进展[J].应用化工,2017,46(3):537-541.
[7]桑亚非,赫玉欣,张丽,等.磁性纳米材料的制备与应用进展[J].化工新型材料,2017,45(1):1-3.
[8]姬丽琴,齐永新,周林成,等.磁性微/纳米材料吸附环境污染物的研究进展[J].化工新型材料,2011,39(11):32-35.
[9]潘仲彬,刘进军.FePt磁性纳米颗粒的化学制备方法[J].功能材料,2014,45(10):10023-10029.
[10]Yu C,Dong X,Guo L,et al.Template-free preparation of mesoporous Fe2O3and its application as absorbents[J].Journal of Physical Chemistry C,2008,112:13378-13382.
[11]都吉雅.纳米γ-Fe2O3的制备及其吸附性能研究[D].呼和浩特:内蒙古师范大学,2015.
[12]Asuha S,Gao Y W,Deligeer W,et al.Adsorptive removal of metahyl orange using mesoporous maghemite[J].Journal of Porous Materials,2011,18(5):581-587.
[13]Asuha S,Zhao S,Wu H Y,et al.One step synthesis of maghemite nanoparticles by direct thermal decomposition of Fe-urea complex and their properties[J].Journal of Alloys and Compounds,2009,472(1/2):23-25.
[14]Chen F,Xiong L,Cai M,et al.Adsorption of direct fast scarlet 4BSdye from aqueous solution onto natural superfine down particle[J].Fibers and Polymers,2015,16(1):73-78.
