溶胶-凝胶法制备多孔晶体材料C12A7-C1~-

利用溶胶-凝胶法制备了多孔晶体材料C12A7-Cl~-(Ca_(12)Al_(14)O_(32)Cl_2),制备凝胶的原料是四水合硝酸钙、九水合硝酸铝、氯化钙、尿素和乙二醇.混合溶液经过搅拌2-3 h形成溶胶,再经350℃热处理后形成凝胶体,最终在流动氩气气氛中1000℃烧结后得到材料.用X射线衍射,场发射扫描电子显微镜,热重分析,电子顺磁共振和离子色谱等方法表征合成的C12A7-Cl~-多孔晶体材料.结果表明,利用溶胶.凝胶法成功地生成了C12A7结构,氯负离子是材料中存储的主要负离子.此外,从C12A7-Cl~-晶体材料表面发射的氯负离子也被飞行时间质谱观测到.上述结果说明溶胶-凝胶法可被用于制备C12A7-Cl~-晶体材料.

Sol-Gel Preparation of Porous C12A7-C1~- Crystals

Present study provides an approach to produce porous crystal material of C12A7-C1~-(Ca_(12)Al_(14)O_(32)Cl_2)by sol-gel method. Reactants for the gel were Ca(NO_3)_2 ·4H_2), Al(NO_3)_3·9H_2O, CaCl_2, urea, and ethylene glycol. The mixture solution was stirred for 2-3 h to form the sol, after thermal treatment at 350 ℃ the formed gel was then sintered under flowing argon at 1000 ℃. The prepared porous crystal material was investigated by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), thermogravimetric analysis (TGA), electron paramagnetic resonance (EPR), and ion chromatography (IC). Results indicated that the C12A7-C1~- material was successfully prepared via sol-gel method and the Cl~- anions were the dominant anions stored in the bulk of the material. The emission of Cl~-anions from the C12A7-C1~- surface was detected by time-of-flight mass spectrometry (TOF-MS). Our results show that the sol-gel method can be potentially useful in the development of C12A7-C1~- materials.