Competitive adsorption of water vapor with VOCs dichloroethane, ethyl acetate and benzene on MIL-101(Cr) in humid atmosphere
Competitive adsorption of water vapor with VOCs dichloroethane, ethyl acetate and benzene on MIL-101(Cr) in humid atmosphere
复制标题
潮湿大气中MIL-101(Cr)上水蒸气与VOCs二氯乙烷、乙酸乙酯和苯的竞争吸附
DOI：
10.1039/c4ra10463c
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发表时间：
2015-01-01
期刊：
影响因子：
3.9
通讯作者：
Li, Zhong
中科院分区：
文献类型：
--
作者：
Xian, Shikai;Yu, Ying;Li, Zhong
众所周知，水蒸气是无处不在的。在实际应用中，这将不可避免地对新型多孔材料的VOC吸附产生负面影响。本文通过等温线测量、突破实验和TPD实验，研究了潮湿大气中水蒸气与1，2-二氯乙烷（VCE）、乙酸乙酯（EA）和苯三种挥发性有机化合物在MIL-101上的竞争吸附行为。结果表明，MIL-101对DCE、EA和苯的吸附容量分别高达9.71、5.79和3.76 mmol g−1，远高于其他常规吸附剂。突破性实验表明，由于水蒸气在MIL-101表面上的竞争性吸附，进料流中水蒸气的存在导致MIL-101的VOC工作能力急剧下降。这些挥发性有机物的穿透时间和工作容量随着相对湿度的增加而变小。TPD实验表明，水蒸气、DCE、EA和苯在MIL-101上的脱附活化能分别为72.9、47.14、41.9和38.16 kJ mol−1。由于水蒸气与MIL-101之间的相互作用较强，与VOCs形成了较强的竞争吸附，导致VOCs在潮湿环境中的工作容量急剧下降。
It is well-known that water vapor is omnipresent. It would inevitably have a negative influence on VOC adsorption on novel porous materials in actual situations. In this work, the competitive adsorption behavior of water vapor with three VOCs, 1,2-dichloroethane (DCE), ethyl acetate (EA) and benzene, on MIL-101 in a humid atmosphere was investigated by isotherm measurement, breakthrough experiments and TPD experiments. The results showed that adsorption capacities of MIL-101 for DCE, EA and benzene were individually up to 9.71, 5.79 and 3.76 mmol g−1, much higher than those of other conventional adsorbents. Breakthrough experiments indicated that the presence of water vapor in the feed stream resulted in a sharp decrease in the VOCs working capacities of MIL-101 due to competitive adsorption of water vapor on MIL-101 surfaces. The breakthrough times and the working capacities of these VOCs became smaller with an increase in the relative humidity. TPD experiments indicated that the desorption activation energies of water vapor, DCE, EA and benzene on MIL-101 were 72.9, 47.14, 41.9, and 38.16 kJ mol−1, respectively. The stronger interaction of water vapor with MIL-101 formed strong competitive adsorption with VOCs on MIL-101, resulting in the sharp decrease of the VOCs working capacities in a humid atmosphere.