铜基改性活性炭吸附净化工业废气中的气态噻吩

Adsorptive purification of C_4H_4S in industrial waste gas by Cu-based modified activated carbon

采用等体积浸渍法制备铜基改性活性炭,考察活性组分、组分浓度、焙烧温度、吸附温度、氧质量分数对气态噻吩(C4H4S)吸附净化的影响。利用N2物理吸附(BET)、X线衍射(XRD)、扫描电镜(SEM)、能量色散谱仪(EDS)、X线光电子能谱(XPS)等表征手段对活性炭进行表征并研究Cu基改性活性炭对噻吩的净化机理。研究结果表明:选用浓度为0.1 mol/L乙酸铜,焙烧温度为300℃,吸附温度为20℃,氧质量分数为1.0%时改性活性炭对噻吩的吸附催化效率有较好的效果,400 min内吸附效率达到90%;在较优条件下制备的铜基改性活性炭具有很高的比表面积,其吸附容量相对于空白提高2.8倍,吸附过程中吸附剂活性组分对气态噻吩起催化作用,其有效活性组分主要为CuO。

Cu-based modified activated carbon prepared by impregnation was used for adsorbents of C4H4S purification. The active component, oxygen concentration, adsorption temperature, component were investigated for C4H4S adsorption adsorptive purification. The effects of preparation conditions on the adsorbent were characterized by N2 adsorption-desorption （N2-BET）, scanning electron microscope （SEM）, energy dispersive spectrometer （EDS）, X-ray photoelectron spectroscopy （XPS） and X-ray diffraction （XRD）. The results show that the optimal condition for adsorptive purification are Cu2＋ concentration of 0.1 mol/L, cremation temperature of 300 ℃ and adsorption temperature of 20℃, oxygen mass fraction of 1%. The adsorption efficiency can reach 90% within 400 min. The Cu-based modified activated carbon has a higher specific surface area and also the adsorption capacity has greatly improved compared with the pristine sample. Furthermore, it can effectively prevent the active component from sintering during the adsorption process, with CuO as the effective component for purification of C4H4S.