不同温度热解残余生物质半焦对磷的吸附

目的]研究生物质热解制备生物油的残余半焦对水中磷的吸附性能。方法]研究了不同温度（550、650和750℃）热解半焦吸附磷的动力学和等温线,分别采用准一级、准二级和颗粒内扩散3种模型及Langmuir、Freundlich等温吸附方程对实验数据进行拟合。结果]结果表明准二级动力学模型能较好描述磷在半焦表面的吸附行为,平衡吸附量和吸附速率随着热解温度的升高而增加。此外,等温吸附过程能较好地用Freundlich吸附等温线方程描述,表明磷在半焦表面的吸附受多种机制影响。3种温度下热解所得半焦对磷的吸附活化能分别为10.86、11.27和10.95kJ/mol,说明该吸附过程主要为物理吸附。结论]生物质热解半焦对水中磷具有良好的吸附去除效果。

Phosphate Adsorption of Residual Biomass Char by Pyrolysis

Objective]The aim was to study adsorption of phosphorus in water by residual biomass char.Method]The adsorption kinetics and isotherm of phosphate by biomass char obtained at different temperatures were studied.The pseudo first-order,pseudo second-order,intra-particle diffusion models and Langmuir,Freundlich isotherm models were employed to fit experimental data.Result]The results showed that the adsorption of phosphate followed the pseudo second-order kinetics model and the equilibrium adsorption capaci...