活性炭基π络合吸附剂的制备及其脱除二硫化碳性能研究

Adsorption of Carbon Disulfide by π Complexation Adsorbent Modified by Activated carbon

摘要:

以活性炭(AC)为载体，浸渍法制备了过渡金属负载型吸附剂。考察浸渍液、吸附温度对吸附剂脱除低浓度二硫化碳(CS2)的性能影响，并对吸附剂的再生性能进行了研究。通过XRD、N2物理吸附、FE-SEM对吸附剂进行了表征。结果表明，K2CO3处理能够有效增加AC载体的微孔数量。Ag+在AC表面易被还原成Ag0，降低了与CS2的络合作用。Cu(NO3)2改性后活性组分为Cu2O，提高AC表面软酸性，促进与CS2的π络合作用。K2CO3-Cu(NO3)2改性后，吸附剂(CuKAC)脱除CS2的效果最佳，吸附量达到了77.32mg/g。吸附温度是影响CuKAC吸附剂脱除CS2性能的重要因素，吸附温度20℃时吸附性能最好。N2气氛下再生温度200℃时CuKAC的再生率达到100%，10次吸附/再生后吸附剂的吸附能力保持稳定。

Abstract:

Activated carbon(AC) modified with different transition metal was studied for carbon disulfide(CS2) removal efficiency at ambient temperature. The effects of impregnants, adsorption temperature and regeneration performance were investigated. The adsorbents were characterized by employing N2-physical adsorption, FE-SEM and XRD. The results showed that The number of microporous of AC treated by K2CO3 significantly increased. The active sites were existed in the form of Cu2O after modified with Cu(NO3)2, and the soft acid of AC were improved, which promoted the complexation with CS2. However, silver ions were reduced to Ag0 in the surface of AC, and the complexation were lower. Activated carbon modified with K2CO3-Cu(NO3)2 (denoted as CuKAC) was found to have markedly enhanced adsorption capacity, and the adsorption capacity reached 77.32mg/g. The adsorption capacity showed high dependent on adsorption temperature. The best adsorption temperature was 20℃. CuKAC can be fully regenerated using hot nitrogen at 200℃, and the adsorption capacity remained stable even after ten cycles of regeneration.