焙烧改性浮选尾煤负载纳米Fe_(3)O_(4)去除水中Pb(Ⅱ)的研究

Study on the removal of Pb(Ⅱ)from water by roasting modified flotation tailings loaded with nano Fe_(3)O_(4)

该文通过焙烧隔氧活化处理、负载磁性材料等途径制备了一种浮选尾煤基复合吸附剂,探讨了不同因素对其吸附水中Pb(Ⅱ)重金属离子效果的影响,对其吸附动力学和热力学进行了分析,结合XRD、MLA分析及氮吸附等手段对其物理化学性质进行了表征。实验结果表明:尾煤样品经过800℃高温焙烧改性后,高岭石含量有所减少,伊利石含量有所增加,且孔隙中的水或部分杂质被有效脱除,生成大量气体,从而显著增大了其比表面积和孔径,有利于吸附反应的进行;负载Fe_(3)O_(4)再经800℃焙烧后的浮选尾煤对Pb(II)具有很强的吸附能力,准二级动力学模型和Langmuir等温吸附模型能够很好地拟合尾煤基复合吸附剂对溶液中Pb(Ⅱ)的吸附过程,其对Pb(Ⅱ)的吸附主要是基于单分子层的化学吸附。

This paper prepared a flotation tailings based composite adsorbent through calcination,oxygen separation activation treatment,loading of magnetic materials,and other methods.The effects of different factors on its adsorption of Pb(Ⅱ)heavy metal ions in water were investigated,and its adsorption kinetics and thermodynamics were analyzed.Its physical and chemical properties were characterized by XRD,MLA analysis,and nitrogen adsorption.The experimental results show that the content of Kaolinite is reduced and the content of Illite is increased after the tail coal sample is calcined at 800,and the water or some impurities in the pores are℃effectively removed to generate a large amount of gas,which significantly increases its specific surface area and pore diameter,which is conducive to the adsorption reaction;The flotation tailings loaded with Fe_(3)O_(4)and calcined at 800 have strong adsorption capacity for Pb(℃Ⅱ).The quasi second-order kinetic model and Langmuir isotherm adsorption model can well fit the adsorption process of Pb(Ⅱ)in solution by tailings based composite adsorbents,and their adsorption of Pb(Ⅱ)is mainly based on single molecular layer chemical adsorption.