Xiao Yonghou, Wang Shudong, Wu Diyong, Yuan Quan
Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian Zhongshan Road 457, Dalian 116023, PR China.
J Hazard Mater. 2008 May 30;153(3):1193-200. doi: 10.1016/j.jhazmat.2007.09.081. Epub 2007 Sep 29.
In this study, a sodium carbonate impregnated activated carbon (IAC) was applied as the adsorbent for low concentration hydrogen sulfide (H2S) in nitrogen under the anaerobic conditions in a fixed bed. The effects of impregnation, relative humidity, temperature, and the inlet H2S concentration on the adsorption process were intensively investigated. The data of adsorption capacity were correlated by Langmuir isotherm. The results showed that the data fitted the model well within the concentration range studied. The IAC demonstrated more than three times adsorption capacity for H2S under dry conditions, compared with the original activated carbon (AC). It was confirmed that increasing relative humidity enhanced H2S adsorption capacity on both AC and IAC, and the adsorption capacity of H2S decreased slightly with increasing temperature. To predict breakthrough curves, a one-dimension model for the fixed beds packed with porous adsorbents was proposed and numerically solved. Simulation results matched with the experimental data in most part of the breakthrough curves.
在本研究中，将碳酸钠浸渍活性炭（IAC）用作固定床厌氧条件下氮气中低浓度硫化氢（H₂S）的吸附剂。深入研究了浸渍、相对湿度、温度和入口H₂S浓度对吸附过程的影响。吸附容量数据采用朗缪尔等温线进行关联。结果表明，在所研究的浓度范围内，数据与模型拟合良好。与原始活性炭（AC）相比，IAC在干燥条件下对H₂S的吸附容量高出三倍以上。证实增加相对湿度可提高AC和IAC对H₂S的吸附容量，且H₂S的吸附容量随温度升高略有下降。为预测穿透曲线，提出了一个用于填充多孔吸附剂固定床的一维模型并进行了数值求解。模拟结果在穿透曲线的大部分区域与实验数据相符。
