以天然海泡石为原料，FeSO4·4H2O和FeCl3·6H2O为改性剂，制备了磁改性海泡石并用于处理含Ni2+废水。考察了吸附时间、反应温度、pH和Ni2+初始质量浓度对磁改性海泡石对Ni2+吸附量的影响。结果显示，磁改性海泡石对Ni2+的吸附量随吸附时间、温度、pH与Ni2+初始质量浓度的增加而提高，吸附行为与二级动力学方程和Langmuir等温吸附模型拟合较好。对于Ni2+质量浓度为50 mg/L的废水，在25°C、pH=5的条件下，0.5 g磁改性海泡石对Ni2+的吸附量为2.95 mg/g。通过正交试验优选出适用于处理Ni2+质量浓度为68.48 mg/L的某镀镍车间漂洗废水的最佳条件为：温度65°C，pH 4.2，吸附剂投加量1.5 g，时间为1.5 h。最终Ni2+去除率为99.65%，出水Ni2+质量浓度为0.24 mg/L，远低于GB 21900–2008中表2规定的排放限值(0.5 mg/L)。
A magnetic modified sepiolite was prepared using natural sepiolite as raw material with FeSO4·4H2O and FeCl3·6H2O as modifier, and then used to treat wastewater containing Ni2+.The effects of adsorption time, reaction temperature, pH, and initial mass concentration of Ni2+on the adsorption amount of Ni2+by the magnetic modified sepiolite were studied. It was found that the adsorption amount of Ni2+on the magnetic modified sepiolite is increased with the increasing of adsorption time, temperature, pH, and initial mass concentration of Ni2+. The adsorption behavior is well fitted with a second order rate equation and Langmuir adsorption isotherm. The adsorption amount of Ni2+on the magnetic modified sepiolite in a wastewater containing 50 mg/L Ni2+is 2.95 mg/g under the conditions as follows:temperature 25 °C, pH 5, dosage of adsorbent 0.5 g. The process parameters for treating rinse wastewater containing 68.48 mg/L Ni2+discharged from a nickel plating workshop was optimized through orthogonal test as follows:temperature 65 °C, pH 4.2, dosage of adsorbent 1.5 g, and time 1.5 h. The removal rate of Ni2+is 99.65%, and the effluent mass concentration of Ni2+is 0.24 mg/L, which is much lower than that stipulated in the Table 2 of GB 21900–2008 standard.
参考文献
| [1] | 郭琳,查红平,廖小刚,尹丽,柳正葳.化学沉淀法处理线路板厂含镍废水[J].环境工程,2011(04):50-53,66. |
| [2] | JIN R J;PENG C S;ABOU-SHADY A et al.Recovery of precious metal material Ni from nickel containing wastewater using electrolysis[J].Applied Mechanics and Materials,2012,164:263-267. |
| [3] | MARJANOVI?V;LAZAREVI?S;JANKOVI?-?ASTVAN I et al.Adsorption of chromium(VI)from aqueous solutions onto amine-functionalized natural and acid-activated sepiolites[J].Applied Clay Science,2013,80/81:202-210. |
| [4] | ZHOU X Y;XUE X X .Study on adsorption of heavy metalion in metallurgical wastewater by sepiolite[J].Advanced Materials Research,2013,726/731:2585-2588. |
| [5] | 李琛,从善畅,李立,张帆.羟基铁铝柱撑膨润土在含铬废水处理中的应用[J].电镀与涂饰,2011(08):54-56. |
| [6] | 刘崇敏,黄益宗,于方明,孙晓铧,徐峰,伍文,钟敏.改性海泡石对Pb吸附特性的影响[J].环境化学,2013(11):2024-2029. |
| [7] | 贾明畅,戴友芝,杜婷,刘川.磁性海泡石的研制及吸附Cr（Ⅵ）特性[J].环境化学,2011(09):1546-1552. |
| [8] | 金永铎;董高翔.非金属矿石物化性能测试和成分分析方法手册[M].北京:科学出版社,2004:67-102. |
| [9] | 王未平 .磁改性海泡石吸附铜、铅、镉特性及机理研究[D].湘潭大学,2012. |
| [10] | Ramesh A;Hasegawa H;Sugimoto W;Maki T;Ueda K .Adsorption of gold(III), platinum(W) and palladium(II) onto glycine[J].Bioresource Technology: Biomass, Bioenergy, Biowastes, Conversion Technologies, Biotransformations, Production Technologies,2008(9):3801-3809. |
| [11] | 陈一良,潘丙才,孟凡伟,张全兴.苯酚及对硝基酚在大孔树脂上吸附等温线的研究[J].离子交换与吸附,2004(03):205-213. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%