中文摘要：

以棉花、花生秸秆为原料，采用限氧热裂解法分别于350℃、500℃、650℃下制备生物炭，通过等温吸附和吸附动力学实验，研究两种秸秆生物炭对棕壤中Cu（Ⅱ）的吸附特性和修复效应。结果表明：随裂解温度上升，秸秆生物炭的碳化程度和BET比表面积增加，而含氧官能团、H／C和O／C的比值则减少，且花生秸秆生物炭的芳香化程度、碳化程度和比表面积均高于棉花秸秆生物炭；不同温度梯度制备的生物炭在吸附效果及机制方面存在差异，秸秆生物炭对Cu（Ⅱ）的吸附效果与Lagergren动力学方程的二级动力学方程、Langmuir等温方程可以较好拟合；随着pH的升高，吸附量均增加，吸附量在6．5时达到最大，且花生生物炭的吸附量大于棉花生物炭；SEM电镜扫描图展示了花生秸秆生物炭的表面特征和孔隙结构比棉花明显；FTIR谱图分析表明秸秆生物炭含氧官能团含量随裂解温度的升高而减少。综上，花生秸秆生物炭对山东棕壤重金属污染的修复效果更优。

英文摘要：

Two kinds of straw biochar were made from cotton stalks and peanut straw with the method of limited oxygen thermal cracking under the temperature gradient of 350 ℃, 500 ℃ and 650 ℃. The adsorption characteristics and remediation effect of the two kinds of biochar to Cu （ 11 ） were studied by adsorption kinetics and isothermal adsorption experiments in Brown Earth. The results showed that the degree of carbonization and BET specific surface area increased with the increase of pyrolysis temperature, while oxygen functional groups decreased, the rates of H/C and O/C decreased gradually. The differences in adsorption effect and mechanism were found between the different kinds of biochar made in different temperatures. In addition, the effect of biochar on Cu （ II ） adsorption could fit well with the secondary dynamics equation of Lagergren dynamics equation and Langmuir isotherm equation. The adsorption capacity increased with the increasing in pH, with the maximum at pH 6.5. And the absorption capacity of peanut biochar was more than that of cotton. SEM scan image showed that the surface feature and space structure of peanut straw hiochar were significantly higher than those of cotton. The spectrum analysis of FTIR showed that the content of oxygen functional group in straw biochar decreased with the increase of pyrolysis temperature. In summary, peanut straw biochar had significant remediation effect on Cu （ lI ） pollution in Brown Earth of Shandong Province.