玉米秸秆生物炭对Cd(Ⅱ)的吸附机理研究

被引：461

作者：

李力

陆宇超

刘娅

孙红文

梁中耀

机构：

[1] 南开大学环境科学与工程学院,环境污染过程与基准教育部重点实验室

来源：

农业环境科学学报 | 2012年 / 31卷 / 11期

关键词：

生物炭; 镉; 吸附; 离子交换; 阳离子-π作用;

D O I：

暂无

中图分类号：

X703 [废水的处理与利用];

学科分类号：

083001 [环境科学];

摘要：

以玉米秸秆为原料,在350℃和700℃热解温度下分别制备了两种生物炭(BC350和BC700),并对其理化性质进行了表征。在700℃下制备的生物炭芳构化程度更高,疏水性更强,比表面积更大,孔结构发育更加完全。研究Cd(Ⅱ)在两种生物炭上的吸附发现,Two-site Langmuir吸附等温模型比One-site Langmuir吸附等温模型能更好描述Cd(Ⅱ)在生物炭表面的吸附。BC700对Cd(Ⅱ)的吸附容量大于BC350,解吸率远小于BC350,吸附效果更好;离子交换和阳离子-π作用两种吸附机理同时存在并共同作用,前者分别占BC350和BC700总吸附容量的13.7%和1.1%,后者分别占86.3%和98.9%,阳离子-π作用是最主要的吸附机理。红外光谱FTIR分析表明,生物炭表面的含氧官能团和π共轭芳香结构分别提供不同机理的吸附位点。由于具有更多的离子交换位点,BC350对Cd(Ⅱ)吸附受pH影响较BC700更大。

引用

页码：2277 / 2283

页数：7

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