Abstract:Magnesium-rich C3A (Mg@C3A) was successfully prepared via doping magnesium into cement-based material tricalcium aluminate (C3A) for the co-removal of ammonium (NH4+-N) and phosphorus (PO43-). The effects of Mg@C3A dosage, contaminants concentration, solution pH value, and temperature as well as the mechanism were investigated. Mg@C3A was composed of the C3A isomorphism formed by the replacement of Ca with Mg and the surface MgO, in which the Mg doping does not affect the cubic symmetric structure and morphology of C3A. The maximum removal capacity of NH4+ and PO43- were 38.4, 78.9mg/g at the Mg@C3A dosage of 3g/L, respectively. The increase of temperature was conducive to the co-removal of NH4+ and PO43-by Mg@C3A. High pH value enhanced the NH4+ removal. The removal mechanism of NH4+ was mainly neutralization and the precipitation; PO43- was removed via the precipitation combining with Mg2+ or Al3+ to form struvite or aluminum phosphate.
邹友琴, 李勇丽, 郝鹏飞, 欧阳思达, 朱衷榜, 章萍. 新型水泥基材料富镁C3A对氮磷的共去除[J]. 中国环境科学, 2021, 41(6): 2639-2645.
ZOU You-qin, LI Yong-li, HAO Peng-fei, OUYANG Si-da, ZHU Zhong-bang, ZHANG Ping. The co-removal of ammonium and phosphate by novel cement-based material magnesium-rich tricalcium aluminate and its mechanism investigation. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(6): 2639-2645.
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