掺镁铝酸三钙制备及其共去除水体中氮磷的性能
Magnesium-Doped Tricalcium Aluminate: Preparation and Simultaneous Removal Performance of Nitrogen and Phosphorus
作者单位E-mail
毛玉婷 南昌大学资源环境与化工学院, 鄱阳湖环境与资源利用教育部重点实验室, 南昌 330031
江西省山江湖开发治理委员会办公室, 南昌 330046 
 
欧阳思达 南昌大学资源环境与化工学院, 鄱阳湖环境与资源利用教育部重点实验室, 南昌 330031  
柯智盛 南昌大学资源环境与化工学院, 鄱阳湖环境与资源利用教育部重点实验室, 南昌 330031  
胡艳 赣州市畜牧研究所, 赣州 341401  
于书棋 南昌大学资源环境与化工学院, 鄱阳湖环境与资源利用教育部重点实验室, 南昌 330031  
相明雪 南昌大学资源环境与化工学院, 鄱阳湖环境与资源利用教育部重点实验室, 南昌 330031  
朱衷榜 南昌大学资源环境与化工学院, 鄱阳湖环境与资源利用教育部重点实验室, 南昌 330031  
章萍 南昌大学资源环境与化工学院, 鄱阳湖环境与资源利用教育部重点实验室, 南昌 330031 zhangping@ncu.edu.cn 
摘要: 采用固相反应法成功制备了掺镁铝酸三钙(Mg-C3A)。利用X射线衍射、拉曼光谱、扫描电镜、高分辨率透射电镜研究不同掺镁量下产物的晶相结构、光谱特征和表面形貌,探讨了Mg-C3A形成途径,并考察了Mg-C3A对水体氮和磷的共去除性能。结果表明: Mg-C3A主要是由Mg同晶取代了部分C3A中的Ca而形成的同构体及在C3A表面形成的MgO组成,且Mg的掺杂不改变C3A的晶体结构和基本形貌; Mg-C3A对水体氮(NH4+)和磷(PO43-)的去除量分别为65.2和20.2 mg·g-1,去除过程符合准二级动力学模型,主要受化学反应控制; Mg-C3A主要通过溶出的晶格Mg2+、Al3+分别与NH4+和PO43-形成鸟粪石沉淀及AlPO4而实现氮磷共去除,同时C3A自身溶出的OH-与过量NH4+离子发生中和反应。
关键词: 掺镁铝酸三钙  制备  铵根  磷酸根  共去除
基金项目: 国家自然科学基金(No.21767018)和江西省主要学科学术带头人培养项目(No.20194BCJ22002)资助。
Abstract: Magnesium-doped tricalcium aluminate (Mg-C3A) was successfully prepared through solid reaction method. The crystal structure and morphology of Mg-C3A with various Mg contents were analyzed via X-ray diffraction, Raman spectra, scanning electron microscope and high-resolution transmission electron microscope to explore the preparation mechanism. The results showed that Mg-C3A was composed of C3A isomorphism formed by the replacement of Ca with Mg and the surface MgO, in which the Mg doping did not change the cubic symmetric structure and morphology of C3A. The simultaneous removal behavior of nitrogen (NH4+) and phosphorus (PO43-) by Mg-C3A were investigated by batch experiments (e. g., Mg-C3A dosage, reaction time and real wastewater treatment), which revealed the maximum capacity was 65.2 and 20.2 mg·g-1 at 12 h, respectively, conforming to the pseudo-secondorder kinetic model. Besides, the removal mechanisms were comprehensively explored by microscopic characterizations. The released ions (i.e., Mg2+ and Al3+) of Mg-C3A play a major role in the removal of NH4+ and PO43- via the formation of struvite and AlPO4; the OH- benefits for the removal of excessive NH4+ via neutralization.
Keywords: magnesium-doped tricalcium aluminate  preparation  ammonium  phosphate  simultaneous removal
投稿时间:2021-02-09 修订日期:2021-07-22
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毛玉婷,欧阳思达,柯智盛,胡艳,于书棋,相明雪,朱衷榜,章萍.掺镁铝酸三钙制备及其共去除水体中氮磷的性能[J].无机化学学报,2021,37(10):1745-1752.
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