沸石的疏水改性及其对有机物的吸附性能

Hydrophobic modification of zeolite and its adsorption properties for organic compounds

以天然沸石为原料,通过NaOH溶液碱处理进行致孔、十六烷基三甲氧基硅烷作为偶联剂进行疏水改性制备了疏水性多孔沸石。通过红外光谱、X射线衍射和扫描电镜等对疏水性多孔沸石的物理化学结构进行了表征,研究了十六烷基三甲氧基硅烷的浓度、反应时间和反应温度对疏水性多孔性沸石水接触角的影响,并研究了其对大豆油、煤油、甲苯、柴油等有机物的吸附性能。研究结果表明,在十六烷基三甲氧基硅烷质量分数6%、改性温度80℃、改性时间10h的条件下,疏水性多孔沸石的水接触角最大为156°。疏水性多孔沸石对多种有机物具有很好的吸附容量,其中对煤油的吸附能力最大为1.25g/g,较天然沸石的吸附能力提高了325%,并且在循环使用6次后吸附容量仍在1.14g/g以上,具有良好的使用稳定性和循环利用性能。

Hydrophobic porous zeolite(HPZ)was prepared by alkali treatment and hexadecyltrimethoxysilane(HDTMS)hydrophobic modification with natural zeolite as raw material.The physical and chemical structures of the hydrophobic zeolite were characterized by FT-IR,XRD and SEM techniques.The effects of HDTMS concentration,reaction time and temperature on the contact angel of the HPZ were examined.The adsorption properties of HPZ to soybean oil,kerosene,toluene and diesel oil were also studied.The results indicated that the optimal conditions for preparing HPZ were as follow:HDTMS concentration of 6%,the reaction temperature of 80℃and the modification time of 10 h,which generated the HPZ with a contact angel up to 156°.The adsorption capacity of HMZ for kerosene reached 1.25 g/g,which was 325%higher than that of natural zeolite.The adsorption capacity of HPZ was still up to 1.14 g/g after six times recycle,which confirmed the excellent recycle utilization performance of HMZ.