用NaOH、H₂C₂O₄和Fe(NO₃)₃对丝光沸石依次进行改性,连续改性不会破坏丝光沸石拓扑结构。先碱后酸的改性方式可以提升丝光沸石的比表面积、孔容和引入介孔,使比表面积从255 m²/g增加到356 m²/g,孔容从0.135 cm³/g提升到0.249 cm³/g,对二氯甲烷废气吸附穿透容量从45 mg/g提升到148 mg/g。继续在丝光沸石上负载Fe³⁺,孔容随着负载铁质量分数的增加而下降,对二氯甲烷废气吸附穿透容量与负载铁质量分数呈现倒"U"关系,负载0.98%的铁时吸附穿透容量达到163 mg/g。原位漫反射傅里叶变换红外测试结果表明,二氯甲烷分子与丝光沸石之间作用较弱,主要是被孔道捕获;而负载的Fe³⁺会与氯原子相互作用而吸附二氯甲烷分子。

Mordenite is successively modified by NaOH,H₂C₂O₄ and Fe(NO₃)₃,which does not destroy the topology structure of mordenite.Such a modification operation can help mordenite to increase its specific surface area and pore volume,and generate mesopore.After the modification,the specific surface area of mordenite rises from 255 m²·g^-1 to 356 m²·g^-1,the pore volume increases from 0.135 cm³·g^-1 to 0.249 cm³·g^-1,the breakthrough adsorption capacity for dichloromethane exhaust increases from 45 mg·g^-1 to 148 mg·g^-1.If the modified mordenite is continuously loaded with Fe³⁺,the pore volume decreases with the increasing loading content of Fe³⁺.The relation between the breakthrough adsorption capacity for dichloromethane exhaust and the loading content of iron inverts a "U",and the breakthrough adsorption capacity reaches 163 mg·g^-1 when the loading content of iron is 0.98%.The in situ diffuse reflectance Fourier transform infrared spectroscopy result indicates that the dichloromethane molecules weakly interact with mordenite,and the molecules are mainly hunted by pores;the loaded Fe³⁺ interact with chlorine to adsorb dichloromethane molecules.

王心愿(1991-),男,硕士生,研究方向为分子筛合成和应用,csuwxy17@163.com。