(江蘇大學(xué) 化學(xué)化工學(xué)院，鎮(zhèn)江 212013)
摘 要: 采用偏鈦酸(H2TiO3)和碳酸鉀(K2CO3)為原料，研究不同碳酸鉀和偏鈦酸中TiO2的摩爾比(n(K2CO3)/n(TiO2))、不同焙燒溫度和焙燒時間對產(chǎn)物鈦酸鉀晶型與形貌的影響，并利用XRD和SEM對其相組成及形貌進(jìn)行分析。結(jié)果表明，以偏鈦酸為原料六鈦酸鉀的最佳合成工藝條件為：n(K2CO3)/n(TiO2)為1/3.5，經(jīng)過(900 ℃, 1 h)+(1 000 ℃, 2 h)+(1100 ℃, 2 h)+(1150 ℃, 2 h)高溫下焙燒，即可得到平均直徑為0.62 μm、平均長度為11.06 μm的六鈦酸鉀晶須。產(chǎn)物中六鈦酸鉀晶須的含量高達(dá)97.1%。合成的六鈦酸鉀晶須亮度為87.26，具有良好的白色顏料性能。
關(guān)鍵字: 偏鈦酸；碳酸鉀；六鈦酸鉀；晶須
（Faculty of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China）
Abstract:Potassium hexatitanate whiskers were prepared starting from metatitanic acid and potassium carbonate. The effects of the molar ratios of K2CO3 to TiO2 of H2TiO3 (n(K2CO3)/n(TiO2)), calcination temperature, and calcination time on the crystallinity and the morphology of the resultant potassium titanate were investigated. The samples were characterized by X-ray diffractometry (XRD) and scanning electron microscopy (SEM). The results show that potassium hexatitanate whiskers with a content of 97.1% are synthesized when the molar ratio of K2CO3/TiO2 was 1/3.5 and the sample was calcined at 900 ℃ for 1 h, 1 000 ℃ for 2 h, 1 100 ℃ for 2 h and 1 150 ℃ for 2 h. The average diameter and the average length of the resultant potassium hexatitanate whiskers are 0.62 μm and 11.06 μm, respectively. The brightness is 87.26. The resultant potassium hexatitanate whiskers, as a white pigment, show excellent pigmentary properties.
Key words: metatitanic acid; potassium carbonate; potassium hexatitanate; whisker
