本文關(guān)鍵詞： 碳酸鈣 空心微球 合成 結(jié)晶 聚集　出處：《化工進(jìn)展》2017年03期 　論文類(lèi)型：期刊論文

【摘要】：以Na_2CO_3和CaCl_2為原料,采用復(fù)分解方法,以聚丙烯酸(PAA)和十二烷基磺酸鈉(SDS)為有機(jī)添加劑,合成出具有方解石和球霰石復(fù)合晶型的碳酸鈣空心微球。利用掃描電子顯微鏡(SEM)、透射式電子顯微鏡(TEM)、X射線(xiàn)衍射(XRD)分別對(duì)樣品的形貌、結(jié)構(gòu)和晶型進(jìn)行了表征,通過(guò)研究反應(yīng)過(guò)程中碳酸鈣微球的結(jié)構(gòu)和晶型隨時(shí)間的變化過(guò)程,對(duì)空心微球的形成機(jī)理進(jìn)行了詳細(xì)的探討;考察不同反應(yīng)溫度、PAA和SDS濃度對(duì)碳酸鈣結(jié)晶和生長(zhǎng)的影響。研究結(jié)果表明:反應(yīng)過(guò)程中PAA和SDS會(huì)影響碳酸鈣的聚集行為和形貌結(jié)構(gòu),以此提出了一種鮮有報(bào)道的碳酸鈣空心微球的形成機(jī)理;并且當(dāng)反應(yīng)溫度為80℃、PAA濃度0.5g/L、SDS濃度10mmol/L,反應(yīng)1h時(shí)可獲得粒徑范圍為4~7μm、具有方解石和球霰石復(fù)合晶型的碳酸鈣空心微球。
[Abstract]:Using Na_2CO_3 and CaCl_2 as raw materials, polyacrylic acid (PAA) and sodium 12 alkyl sulfonate (CaCl_2) were used as organic additives. Calcium carbonate hollow microspheres with the composite crystal form of calcite and vaterite were synthesized by means of scanning electron microscope (SEM) and transmission electron microscope (TEM). The morphology, structure and crystal form of the sample were characterized by X-ray diffraction (XRD). The changes of the structure and crystal form of calcium carbonate microspheres with time were studied. The formation mechanism of hollow microspheres was discussed in detail. The effects of different reaction temperatures on the crystallization and growth of calcium carbonate were investigated. The results showed that the aggregation behavior and morphology of calcium carbonate were influenced by PAA and SDS during the reaction. The formation mechanism of calcium carbonate hollow microspheres was proposed. When the reaction temperature is 80 鈩，

本文編號(hào)：1469955