以农业废弃物小麦秸秆制备生物质活性炭,分别用HNO3、NaOH和KMnO4进行改性,通过Boehm法对不同改性活性炭进行表征,考察了吸附时间、pH及Cr(Ⅵ)初始浓度对吸附效果的影响.结果表明,经硝酸改性的活性炭,官能团总量提高,吸附Cr(Ⅵ)的效果和吸附速率最高,受pH变化的影响更小.Langmuir和Freundlich吸附等温线均能反映未改性和硝酸改性活性炭的吸附情况,二者的吸附过程均可用Lagergen二级动力学模型描述.
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