【摘要】 利用分析纯试剂合成β-2CaO·SiO2,研究表面活性剂聚乙二醇(PEG)和聚丙烯酸钠(PAAS)及二者混合物对铝酸钠溶液中β-2CaO·SiO2分解的影响,并通过Zeta电位测量、XPS等手段对吸附前后固液界面电化学性能以及吸附机理进行研究。结果表明:PEG与PAAS对抑制二次反应具有协同作用,在PAAS与PEG体积比为1:1的混合添加模式下,总浓度为12.5 mg/L时抑制二次反应效果最好;PAAS在β-2CaO·SiO2上通过形成—COOCa配位键发生吸附,负电荷进入Stern层,导致吸附颗粒电位下降,渣中Ca 2p、Si 2p和O 1s结合能均发生较大变化;PEG发生物理吸附,吸附对界面电位不产生影响,且渣中Ca 2p、Si 2p和O 1s结合能变化不明显。更多还原

【Abstract】 β-2CaO·SiO2 was obtained with analytical grade reagents. Polyethylene glycol(PEG), sodium polyacrylate(PAAS) and their mixture were used to inhibit the decomposition of β-2CaO·SiO2 in sodium aluminate solution. The potential of solid liquid interface and the adsorption mechanism were studied by the methods of Zeta potential measurement and XPS. The results indicate that PEG and PAAS have synergistic effect on the inhibition of secondary reaction. The inhibitory effect is the best when the volume ratio of PAAS to PEG is 1:1 and the total concentration is 12.5 mg/L. PAAS adsorbs on the surface of β-2CaO·SiO2 by the formation of —COOCa coordinate bond, and the negative charge enters into Stern layer, which results in the decrease of particle potential and the obvious change of binding energy of Ca 2p, Si 2p and O 1s. PEG only physically adsorbs on the surface of β-2CaO·SiO2, and had little effect on particle potential and binding energy of Ca 2p, Si 2p and O 1s.更多还原