• 关键词：氧化钙  硬脂酸  硅烷偶联剂  疏水改性  固化/稳定化

• 基金项目：国家高技术研究发展计划(No.2013AA06A207)

• 侯雷
• 固体废物处理与环境安全教育部重点实验室, 清华大学环境学院, 北京 100084

• 徐如栗
• 固体废物处理与环境安全教育部重点实验室, 清华大学环境学院, 北京 100084

• 于书尧
• 固体废物处理与环境安全教育部重点实验室, 清华大学环境学院, 北京 100084

• 刘建国
• 固体废物处理与环境安全教育部重点实验室, 清华大学环境学院, 北京 100084

• 摘要：为开发事故情况下高浓度毒性有机物污染土壤快速固化/稳定化材料,本文以氧化钙(CaO)为基材,硬脂酸和硅烷偶联剂KH570为两种改性剂,采用湿法工艺对CaO粉体进行表面疏水改性,探讨不同工艺条件对改性效果的影响,并对改性后CaO的形态和结构进行表征.结果表明,硬脂酸改性氧化钙的最佳工艺条件为:硬脂酸添加质量分数5%,改性温度30℃,改性时间30 min;KH570改性CaO的最佳工艺条件为:KH570添加量0.02 mL·g^-1 CaO,改性时间40 min.改性后CaO的接触角均大于90°.傅里叶红外和扫描电镜分析表明,两种改性剂均以化学吸附的方式包覆在CaO表面,达到了表面疏水改性的目的.

• Abstract：The surface modification of calcium oxide (CaO) with stearic acid and silane coupling agent KH570 by a wet process was studied, in order to develop solidification/stabilization agent to capture and immobilize toxic organics in highly contaminated soil. The effects of modification conditions on the hydrophobic property of CaO were optimized, and the functional groups and surface characteristics of the products were investigated through FTIR and SEM, respectively. The results show that the optimum modification condition by stearic acid was 5% in dosage, 30℃, 30 min, and by KH570 was 0.02 mL·g^-1 CaO in dosage, 40 min.. Contact angles of the two modified CaO products were larger than 90°. Results of FTIR and SEM analysis indicate that stearic acid and KH570 were both chemically-coated on the surface of CaO particles, indicating the modification of CaO was successfully achieved.

• Key words：calcium oxide  stearic acid  KH570  hydrophobilized modification  solidification/stabilization

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