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以乙二胺(ED)为改性剂对MIL-101(Cr)-NDC进行表面改性,以改变材料的亲油疏水性能。经XRD、FT-IR、N2吸附和脱附等表征表明,ED分子成功连接入材料中。采用C_5~C_7正构烷烃模拟油气组份测定材料的油气吸附性能,并考察了相对湿度对改性前后材料油气吸附性能的影响。结果表明,25℃下,C_5~C_7正构烷烃和水蒸气在ED-MIL-101(Cr)-NDC上静态吸附量分别为0.558、0.695、0.613 g/g和0.254 g/g,与改性前材料相比,ED-MIL-101(Cr)-NDC的C_5~C_7正构烷烃静态吸附量较高,水蒸气静态吸附量较低;ED-MIL-101(Cr)-NDC在97%相对湿度下的C_5~C_7正构烷动态吸附量为0%相对湿度下C_5~C_7正构烷动态吸附量的65%左右。改性后材料的油气静态吸附性能提升明显,且水蒸气对ED-MIL-101(Cr)-NDC油气吸附影响较小。
The surface modification of MIL-101 (Cr) -NDC with ethylenediamine (ED) as modifier to change the lipophilic and hydrophobic properties of the material. Characterization by XRD, FT-IR, N2 adsorption and desorption showed that the ED molecules were successfully connected into the material. The C_5 ~ C_7 n-paraffin hydrocarbons were used to simulate the oil and gas adsorption properties of the materials, and the effects of relative humidity on the adsorption properties of the materials before and after the modification were also investigated. The results showed that the static adsorption capacities of C 5 -C 7 n-alkanes and water vapor on ED-MIL-101 (Cr) -NDC were 0.558, 0.695, 0.613 g / g and 0.254 g / g respectively at 25 ℃, ED-MIL-101 (Cr) -NDC had a higher static adsorption capacity for C_5 -C_7 n-alkanes and a lower static adsorption capacity for water vapor than ED-MIL-101 The dynamic adsorption capacity of C_5 ~ C_7 n-alkane under the humidity is about 65% of the dynamic adsorption capacity of C_5 ~ C_7 n-alkane under 0% relative humidity. The static adsorption properties of the modified materials increase obviously, and the water vapor has little effect on the adsorption of ED-MIL-101 (Cr) -NDC oil and gas.