摘要
以烟气脱硫石膏为原料,在N,N′-亚甲基双丙烯酰胺(MBA)的调控下,采用两步水热法合成了6~10μm的类球状α-半水硫酸钙(α-CSH)。通过红外光谱分析、能谱分析以及不同乙二醇浓度条件实验,研究了MBA对α-CSH形貌和尺寸的影响及MBA的调控机理。研究发现,MBA可优先吸附在α-CSH的(111)面上,抑制α-CSH沿c轴方向生长;同时,MBA可以形成三维凝胶网络限域α-CSH的成核和生长。经过物理洗涤和两步化学水热处理,α-CSH的白度由39.22%提高至92.06%。
The quasi-sphericalα-calcium sulfate hemihydrate(α-CSH)with the size of 6~10μm has been synthesized from flue gas desulphurization(FGD)gypsum by two-step hydrothermal method under the regulation of N,N′-methylenediacrylamide(MBA).The effect of MBA addition on the morphology and size ofα-CSH product and the regulation mechanism was investigated by FTIR and EDS measurements as well as ethylene glycol concentrationdependent experiments.MBA could be preferentially absorbed on the(111)plane ofα-CSH to inhibit the growth ofα-CSH along c axis,and form a three-dimensional gel network to exert the confinement effect on the nucleation and growth ofα-CSH particles.In addition,after undergoing physical washing and two-step chemical hydrothermal treatment,the whiteness of the synthesizedα-CSH was improved from 39.22%to 92.06%.
作者
马文静
郜丽丽
李雲
陈学青
郭宏飞
李治水
曹吉林
MA Wen-Jing;GAO Li-Li;LI Yun;CHEN Xue-Qing;GUO Hong-Fei;LI Zhi-Shui;CAO Ji-Lin(Engineering Research Center of Seawater Utilization Technology of Ministry of Education,School of Chemical Engineering and Technology,Hebei University of Technology,Tianjin 300130,China;Heze Center for Disease Control and Prevention,Heze,Shandong 274010,China;Tianjin Bohua Yongli Chemical Industry Co.,Ltd.,Tianjin 300452,China)
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2021年第8期1430-1438,共9页
Chinese Journal of Inorganic Chemistry
基金
中国科学院天然气水合物重点实验室(中国科学院广州能源研究所)(No.E029kf1601)
河北省自然科学基金青年基金(No.B2020202081)
河北省高等学校科学技术研究项目(No.QN2019012)资助。
关键词
烟气脱硫石膏
α-半水硫酸钙
两步水热法
N
N′-亚甲基双丙烯酰胺
flue gas desulphurization gypsum
α-calcium sulfate hemihydrate
two-step hydrothermal treatment
N,N′-methylenebisacrylamide
