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：毛玉婷 欧阳思达[1] 柯智盛 胡艳 于书棋 相明雪 朱衷榜 章萍 MAO Yu‑Ting;OUYANG Si‑Da;KE Zhi‑Sheng;HU Yan;YU Shu‑Qi;XIANG Ming‑Xue;ZHU Zhong‑Bang;ZHANG Ping(Key Laboratory of Poyang Lake Environment and Resource Utilization,Ministry of Education,School of Environmental and Chemical Engineering,Nanchang University,Nanchang 330031,China;Office of MRL Development Committee of Jiangxi Province,Nanchang 330046,China;Ganzhou Institute of Animal Science,Ganzhou,Jiangxi 341401,China)

机构地区：[1]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 [2]江西省山江湖开发治理委员会办公室,南昌330046 [3]赣州市畜牧研究所,赣州341401

出　　处：《无机化学学报》2021年第10期1745-1752,共8页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.21767018);江西省主要学科学术带头人培养项目(No.20194BCJ22002)资助。

摘　　要：采用固相反应法成功制备了掺镁铝酸三钙(Mg-C_(3)A)。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-C_(3)A形成途径,并考察了Mg-C_(3)A对水体氮和磷的共去除性能。结果表明:Mg-C_(3)A主要是由Mg同晶取代了部分C_(3)A中的Ca而形成的同构体及在C_(3)A表面形成的MgO组成,且Mg的掺杂不改变C_(3)A的晶体结构和基本形貌;Mg-C_(3)A对水体氮(NH_(4)+)和磷(PO_(4)3-)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-C_(3)A主要通过溶出的晶格Mg^(2+)、Al^(3+)分别与NH_(4)+和PO_(4)^(3-)形成鸟粪石沉淀及AlPO_(4)而实现氮磷共去除,同时C_(3)A自身溶出的OH-与过量NH_(4)+离子发生中和反应。Magnesium-doped tricalcium aluminate(Mg-C_(3) A) was successfully prepared through solid reaction method.The crystal structure and morphology of Mg-C_(3) A 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-C_(3) A was composed of C_(3) A 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 C_(3) A.The simultaneous removal behavior of nitrogen(NH_(4)+) and phosphoms(PO_(4)3-) by Mg-C_(3) A were investigated by batch experiments(e.g.,Mg-C_(3) A 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.,Mg^(2+) and Al^(3+)) of Mg-C_(3) A play a major role in the removal of NH_(4)+ and PO_(4)^(3- )via the formation of struvite and AlPO_(4);the OH-benefits for the removal of excessive NH_(4)+ via neutralization.

关 键 词：掺镁铝酸三钙 制备 铵根 磷酸根 共去除 

分 类 号：O614.22[理学—无机化学] O614.3[理学—化学]