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以天然稻壳和凹凸棒石为原料,通过高温炭化,制备了新型无机重金属离子吸附剂-凹凸棒石/脱硅稻壳炭(ATP/DAC)复合材料。采用Zeta电位、TEM、BET等技术对材料进行了表征。通过静态吸附法,研究了不同条件下(pH值、吸附时间、初始浓度)ATP/DAC对Pb2+,Cu2+,Ni2的吸附特性。结果表明:ATP/DAC对离子半径大的重金属有较好的吸附,吸附能力表现为:Pb2+>Cu2+>Ni2+。动力学研究表明:3种重金属离子在ATP/DAC上的吸附均遵循二级动力学方程。吸附等温线研究发现ATP/DAC对Ni2+的吸附等温线更符合Langmuir和D-R模型,Pb2+和Cu2+更适合Freundlich模型。红外光谱(FTIR)表明ATP/DAC复合材料与重金属离子之间存在化学吸附。
A new type of inorganic heavy metal ion adsorbent, attapulgite / de-silica rice straw (ATP / DAC) composite was prepared from natural rice husk and attapulgite by carbonization at high temperature. The materials were characterized by Zeta potential, TEM and BET techniques. Adsorption properties of Pb2 +, Cu2 +, Ni2 by ATP / DAC under different conditions (pH value, adsorption time, initial concentration) were studied by static adsorption method. The results show that ATP / DAC has good adsorption on heavy metals with large ionic radius, and its adsorption capacity is as follows: Pb2 +> Cu2 +> Ni2 +. Kinetic studies show that the adsorption of three kinds of heavy metal ions on ATP / DAC follows the second-order kinetic equation. Adsorption isotherm studies showed that the adsorption isotherms of Ni2 + by ATP / DAC are more consistent with the Langmuir and D-R models, and Pb2 + and Cu2 + are more suitable for the Freundlich model. Infrared spectroscopy (FTIR) indicates chemisorption between ATP / DAC composites and heavy metal ions.