研究了不同热解条件下制备的秸秆生物炭对铜离子的吸附动力学规律.以常见的玉米杆和番茄杆为原料,在限氧升温热解的条件下制备生物炭.研究不同热解温度(300、400、500、600、700℃)和不同热解时间(1、2、4、6、8h)对秸秆生物炭吸附性能的影响,实验结果表明番茄杆样品T6004和玉米杆样品C6006分别获得对铜离子的最佳吸附效果,其去除率分别为98.40％和98.77％.通过批试验探明秸秆生物炭对Cu2+的吸附动力学特征与机理,秸秆生物炭对Cu2+的吸附动力学数据随时间的变化能很好地用准二级动力学方程进行拟合,说明生物炭对Cu2+的吸附是一个复杂的过程,并不是简单的单层吸附.用颗粒内扩散模型进行拟合分析发现,热解时间和温度对秸秆生物炭的吸附边界层厚度均会产生不同程度的影响.此外,颗粒内扩散并非吸附过程的唯一控速步骤,表面吸附和液膜扩散共同控制吸附反应速率.
This paper aims to investigate the adsorption kinetic for copper ions on biochars prepared under different conditions.A series of biochars from tomato stem and cornstalk were synthesized at different temperatures (300,400,500,600,700 ℃) or different pyrolytic times (1,2,4,6,8 h) under limited oxygen condition.The sample T6004 and C6006 possess optimum absorption capacity for copper ions,and the removal rates were 98.40％ and 98.77％ respectively.The adsorption kinetic features of the biochars could be best fitted by pseudo second-order kinetic model regardless of pyrolysis condition,suggesting that the adsorption is related to the adsorption sites on biochar,rather than simple single-layer sorption.The results of intraparticle diffusion model indicated that the adsorption boundary layers are influenced by different pyrolysis temperatures and times.The fitting analyses using the intraparticle diffusion model also showed that the adsorption process was effected by intraparticle diffusion,surface adsorption and liquid film diffusion.
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