【摘要】 以芦苇、小麦秸秆和竹子为原料,利用回流式炭化工艺制备3种生物炭。比较三者对NH₄⁺-N、PO₄^3--P的吸附性能,并对三者吸附性能差异的成因进行分析。实验结果表明:3种生物炭对PO₄^3--P的吸附效果整体上优于NH₄⁺-N,因为3种生物炭的阳离子交换容量CEC值和Zeta电位绝对值的水平均较低,不利于阳离子的吸附;竹炭Z-C对NH₄⁺-N的吸附效果最佳,6 h去除率为3.59%,低的N含量、pH及Zeta电位绝对值对NH₄⁺-N的吸附有利;芦苇炭LW-C中的O更多地与K、Mg等结合,形成能够与PO₄^3-反应生成磷酸盐沉淀或者晶体物质的金属氧化物,从而具有最好的PO₄^3--P的吸附效果,6 h时去除率达16.91%。更多还原

【Abstract】 Using reed,wheat straw and bamboo as raw materials,three kinds of biochars were prepared by reflux carbonization process. The adsorption abilities of the 3 biochars to NH₄⁺-N and PO₄^3--P were compared,and the causes of the differences were analyzed. The results showed that:The adsorption abilities of the 3 biochars to PO₄^3--P were better than that to NH₄⁺-N on the whole,because of the low CEC and absolute values of Zeta potential of biochars,which were not conducive to the adsorption of cations;Bamboo charcoal Z-C had the best adsorption ability to NH₄⁺-N with 3.59% of removal rate at 6 h,because its low TN content,p H and absolute value of Zeta potential were bene?cial to NH₄⁺-N adsorption;Reed charcoal LW-C had the best adsorption ability to PO₄^3-P with 16.91% of removal rate at 6 h,because O in LW-C was most combined with K and Mg to form metal oxides which could react with PO₄^3-to form phosphate precipitates or crystalline substances.更多还原