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通过控制反应体系的pH值为9.0~9.5,制得高纯度的磷酸铵镁(MAP);利用XRD、SEM、TGA-DTA及FT-IR等技术,研究MAP的热分解行为及热解产物对氨氮的吸附性能。结果表明,在pH值为9.0~9.5的条件下可制得高纯度的MAP。将MAP在100~120°C下热解120 min,可将氨及水脱除,热解固体产物粒径变小,结晶度降低,对氨氮的吸附量达72.5 mg/g,对起始浓度为800 mg/L溶液的氨氮去除率达95%以上。吸附氨氮后,其XRD谱中主要出现MAP的特征衍射峰。循环使用结果表明,将MAP在100~120°C条件下发生热解,热解固体产物可循环用于氨氮的处理药剂。
High-purity magnesium ammonium phosphate (MAP) was prepared by controlling the pH value of the reaction system at 9.0-9.5. The thermal decomposition behavior and pyrolysis products of MAP were studied by XRD, SEM, TGA-DTA and FT-IR. Ammonia nitrogen adsorption performance. The results showed that high purity MAP could be obtained under the condition of pH 9.0-9.5. When the MAP was pyrolyzed at 100-120 ° C for 120 min, ammonia and water could be removed. The pyrolyzed solid product became smaller and the crystallinity decreased. The adsorption capacity of ammonia nitrogen reached 72.5 mg / g. The initial concentration Ammonia nitrogen removal rate of more than 95% for the 800 mg / L solution. After adsorption of ammonia nitrogen, the characteristic diffraction peaks of MAP mainly appear in the XRD spectrum. Recycling results show that the MAP pyrolysis at 100 ~ 120 ° C conditions, the pyrolysis of the solid product can be recycled for ammonia nitrogen treatment agent.