文献类型：期刊文献

中文题名：添加剂在半水硫酸钙表面的吸附特征研究

英文题名：Adsorption Characteristics of Additives on Hemihydrate Calcium Sulfate

作者：付文健[1];林美庆[1];何慧艳[1];陈杰[1];程雲[1];赵敏[1]

机构：[1]华东理工大学化学与分子工程学院,上海200237

年份：2019

卷号：45

期号：2

起止页码：266

中文期刊名：华东理工大学学报（自然科学版）

外文期刊名：Journal of East China University of Science and Technology

收录：CSTPCD;;Scopus;北大核心:【北大核心2017】；CSCD:【CSCD_E2019_2020】；

语种：中文

中文关键词：柠檬酸;聚丙烯酸;吸附;络合

外文关键词：citric acid;poly acrylic acid;adsorption;chelation

摘要：以有机羧酸为添加剂,研究了聚丙烯酸(PAA)、柠檬酸(CA)在半水硫酸钙(HCS)表面的吸附作用和吸附机理。采用总有机碳分析仪(TOC)分析添加剂在HCS表面的吸附特征,用透射电镜-能量损失谱(TEM-EELS)、X射线电子能谱(XPS)、激光显微拉曼光谱、傅里叶红外光谱(FTIR)等微观表征方法对吸附层结构进行分析,最后结合HCS晶体结构探讨添加剂的吸附机理。结果表明有机羧酸在HCS表面的吸附符合Langmuir等温吸附理论,吸附动力学更符合二级反应。
In this paper,the adsorption and adsorption mechanism of poly(acrylic acid)(PAA) and citric acid (CA) on the surface of calcium sulfate hemihydrate (HCS) were studied using organic carboxylic acids as additives.The adsorption characteristics of additives on HCS surface were analyzed by using total organic carbon analyser (TOC).TEM-EELS,X-ray electron spectroscopy (XPS),laser Raman spectroscopy,FTIR and other characterization methods were used to analyze the adsorption layer structure.Finally,the adsorption mechanism of additives was explored in combination with the crystal structure of HCS.The results show that the adsorption of organic carboxylic acid on the surface of HCS can be fitted by the Langmuir isotherm adsorption theory,and the adsorption kinetics was found to follow the second-order rate equation.Organic carboxylic acid was absorbed on the surface of gypsum through the interaction between carboxyl group and Ca^2+.The carboxyl group of CA was preferentially adsorbed in the C-axis direction of the HCS crystal compared to crystal planes in other directions.PAA was adsorbed on each crystal surface of HCS,and it exerts a dispersion effect through electrostatic repulsion and steric hindrance,which in turn affects the crystal morphology.At the same time,taking CA as an example,the stability constants of the complexes adsorbed on the surface of HCS were studied.