磁性凹凸棒土的制备及其对水中铅离子的吸附
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摘要
利用化学共沉淀法制备了磁性凹土复合吸附剂(ATP/Fe_3O_4),通过静态吸附实验研究了该材料对水中Pb~(2+)的吸附性能。采用扫描电子显微镜(SEM)、X射线衍射仪(XRD)、红外光谱仪(FTIR)和振动样品磁强计(VSM)对复合吸附剂进行表征,并考察了吸附剂投加量、溶液初始pH值及吸附时间等因素对Pb~(2+)吸附效果的影响。结果表明,Fe_3O_4颗粒负载在凹土表面,复合吸附剂的比饱和磁化强度为29.22 emu/g,可有效实现固液分离的目标。Pb~(2+)吸附实验表明,ATP/Fe_3O_4对Pb~(2+)具有良好的吸附效果,当Pb~(2+)初始浓度为50mg/L、溶液pH为5.0、吸附剂用量为3.0 g/L时,去除率可达87.35%。ATP/Fe_3O_4对Pb~(2+)的吸附行为符合准二级动力学方程。
A batch system was used to evaluate the adsorption properties of Pb~(2+)onto a magnetic attapulgite composite, which was prepared by chemical coprecipitation method.The composite adsorbent was characterized by scanning electron microscope(SEM), X-ray diffraction(XRD), Fourier transform infrared spectroscopy(FTIR) and vibrating sample magnetometer(VSM), and the adsorbent dosage,initial pH value and adsorption time on the adsorption efficiency of Pb~(2+)in aqueous solution were investigated. The results show that Fe_3O_4 particles are loaded on the attapulgite surface, and the specific saturation magnetization of the composite adsorbent reaches 29.22 emu/g, which could be separated efficiently from solution by magnetic separation. In addition, the sorbent has favorable adsorption ability for Pb~(2+)and the removal rate achieves 87.35% when the initial concentration of Pb~(2+)is 50 mg/L, the solution pH is 5 and the adsorbent dosage is 3 g/L at 25° C. The adsorption kinetics follows the mechanism of the pseudo-second-order kinetic model.
A batch system was used to evaluate the adsorption properties of Pb~(2+)onto a magnetic attapulgite composite, which was prepared by chemical coprecipitation method.The composite adsorbent was characterized by scanning electron microscope(SEM), X-ray diffraction(XRD), Fourier transform infrared spectroscopy(FTIR) and vibrating sample magnetometer(VSM), and the adsorbent dosage,initial pH value and adsorption time on the adsorption efficiency of Pb~(2+)in aqueous solution were investigated. The results show that Fe_3O_4 particles are loaded on the attapulgite surface, and the specific saturation magnetization of the composite adsorbent reaches 29.22 emu/g, which could be separated efficiently from solution by magnetic separation. In addition, the sorbent has favorable adsorption ability for Pb~(2+)and the removal rate achieves 87.35% when the initial concentration of Pb~(2+)is 50 mg/L, the solution pH is 5 and the adsorbent dosage is 3 g/L at 25° C. The adsorption kinetics follows the mechanism of the pseudo-second-order kinetic model.
引文
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[4]谢晶晶,陈天虎,陈冬,等.27Al魔角旋转核磁共振研究热处理凹凸棒石结构中Al配位变化[J].硅酸盐学报,2013,41(2):235-239.
[5]Potgieter J H,Potgieter-Vermaak S S,Kalibantonga P D.Heavy metals removal from solution by palygorskite clay[J].Minerals Engineering,2006,19(5):463-470.
[6]Chang Y,Liu H W,Zha F,et al.Adsorption of Pb(Ⅱ)by nmethylimidazole modified palygorskite[J].Chemical Engineering Journal,2011,167:183-189.
[7]马文清,赫文芳,王雲生,等.磁性埃洛石复合材料的制备及其对亚甲基蓝吸附性能研究[J].硅酸盐通报,2017,36(1):242-248.
[8]黄明,李绍峰,鲁秀国,等.磁性高岭土的制备及对铅离子的吸附[J].环境工程学报,2016,10(11):6439-6445.
[9]施周,袁明洋,杨秀贞,等.磁性壳聚糖改性硅藻土吸附去除水中的铅离子[J].环境工程学报,2017,11(2):787-792.
[10]Long Y,Chen Z,Duvail J L,et al.Electrical and magnetic properties of polyaniline/Fe3O4nanostructures[J],Physica B Physics of Condensed Matter,2005,370(1):121-130.
[11]李建军,鲍旭,吴先锋,等.磁性壳聚糖复合微球的制备及其Cu2+吸附性能[J],无机化学学报,2017,33(3):383-388.
[12]Yeddou N,Bensmaili A.Kinetic models for the sorption of dye from aqueous solution by clay-wood sawdust mixture[J],Desalination,2005,185(1):499-508.