中文摘要：

将预处理后的竹叶经HClO_4、H_2SO_4、H_3PO_4水热改性,分别记为BLC、BLS、BLP。通过红外光谱及Boehm滴定法分析了改性竹叶表面结构,结果显示,水热酸改性后的吸附剂表面基团数量明显增加,其中以BLC吸附剂最为明显。考察水热酸浓度对改性竹叶吸附水中Cr（Ⅵ）能力的影响,其中以质量分数为20%的HClO_4改性后的BLC样品吸附能力最强。考察了BLC样品的投加量、pH等对水中Cr（Ⅵ）吸附性能的影响,并开展了吸附动力学和等温吸附实验。结果表明,BLC吸附剂对Cr（Ⅵ）的去除率随pH的增大而降低,其吸附过程符合伪二级动力学方程,温度对吸附性能影响较小,吸附过程为Langmuir单分子层吸附。

英文摘要：

Pretreated bamboo leaf was modified with HClO_4,H_2SO_4,and H_3PO_4 by a hydrothermal method,and the resulting products were named BLC,BLS,and BLP,respectively. The surface structure of the modified samples was characterized by fourier transform infrared spectroscopy（ FTIR） and Boehm titration. The results showed that the number of surface groups on the adsorbent was clearly increased by hydrothermal modification,especially in the BLC sample. The effect of acid concentration on the adsorption of Cr（ Ⅵ） from aqueous solution was then investigated,and the results showed that BLC modified with 20% HClO_4 had the best adsorption capacity. The influence of BLC dosage and initial p H on the capacity for adsorption of Cr（ Ⅵ） from aqueous solution was also considered. Moreover,kinetic and thermodynamics models of the adsorption process were studied. The results showed that the Cr（ Ⅵ） removal rate decreased with increasing p H,and the adsorption process was consistent with a pseudo-second order kinetic model. Temperature had little influence on the adsorption capacity,and the adsorption process was well described by the Langmuir monolayer adsorption model.