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采用等温吸附法比较了天然的蛇纹石和700℃热改性处理的热改性蛇纹石对含铅废水的吸附效果,并采用Langmuir、Freundlich方程及Lagrange假二级动力学方程、粒内扩散方程对实验数据进行了拟合,研究了pH对吸附效果的影响,并对2种蛇纹石做了X衍射。结果表明:Pb2+质量浓度大于50mg/L时,热改性蛇纹石吸附效果更好,吸附率在92%以上;天然蛇纹石对Pb2+的吸附符合Freundlich方程和Lagrange假二级动力学方程,以化学吸附为主,有多个控速步骤,热改性蛇纹石对Pb2+的最大吸附量为78.13mg/g;在pH>6的条件下,天然蛇纹石对Pb2+的吸附效果更好。
The isothermal adsorption method was used to compare the adsorption effect of natural serpentine and heat-modified serpentine treated by heat treatment at 700 ℃ on leaded wastewater. The Langmuir, Freundlich equation and Lagrange pseudo-second-order kinetic equation were used to compare the effects of intra- The equations were fitted to the experimental data to study the effect of pH on the adsorption effect, and X-ray diffraction was performed on the two serpentines. The results show that the adsorption of Pb2 + on Pb2 + is better than Fremontlich equation and Lagrange’s pseudo second-order kinetic equation when the mass concentration of Pb2 + is above 50mg / L, and the adsorption rate is over 92% The main chemical adsorption, there are a number of rate-control steps, heat-modified serpentine Pb2 + maximum adsorption capacity of 78.13mg / g; pH> 6 conditions, natural serpentine adsorption of Pb2 + better .