水葫芦生物炭对水体中磷的吸附条件优化及性能研究

Optimization of Adsorption Conditions and Properties of Biomass Carbon of Eihhornia crassipes to Phosphorus

摘要: 采用生物炭来吸附水体中磷污染是目前环境领域的研究热点。水葫芦在富营养化水体中生长旺盛，且数量巨大，可作为原料来制备生物炭，其对磷的去除研究比较少见。本文采用水葫芦，在400℃温度下热解制备生物炭。研究生物炭在不同磷溶液初始浓度、初始pH值与平衡时间下对磷的吸附性能。实验结果表明：水葫芦生物炭对磷的吸附量随着含磷溶液浓度增加呈现增强的趋势，在浓度为200 mg/L时磷吸附容量趋于平稳。随pH值升高，生物炭对磷的吸附量增加迅速，在pH值为6时达到对磷的吸附峰值，吸附量达到1536 mg/kg。水葫芦生物炭对磷的吸附过程中，开始吸附时，随着时间的增加吸附量上升迅速，65 min后上升趋于平稳，在120 min内基本达到吸附平衡。水葫芦生物炭对磷具有较强的吸附性能，是一种很有潜力的吸附剂。

Abstract: The application of biochar to adsorb phosphorus pollution in water is a hot topic in the field of environmental research. Eihhornia crassipes can be used as raw material to prepare biochar and its removal of phosphorus is relatively rare. Biochar was prepared by Eihhornia crassipes pyrolysis at 400˚C in this paper. The adsorption properties of biochar to phosphorus under different initial concentration, initial pH and equilibrium time of phosphorus solution were studied. The experimental results showed that the phosphorus adsorption capacity of Eihhornia crassipes biochar increased with the increase of the concentration of phosphorus containing solution, and the phosphorus adsorption capacity tended to be stable when the concentration was 200 mg/L. With the increase of pH ,the adsorption capacity of biochar to phosphorus increased rapidly, and reached the peak value of phosphorus adsorption at pH 6, with the adsorption capacity reaching 1536 mg/kg. In the process of phosphorus adsorption by Eihhornia crassipes biochar, the amount of phosphorus adsorption increases rapidly with the increase of time, and tends to be stable after 65 min, and basically reaches the adsorption equilibrium within 120 min. Eihhornia crassipes biochar has strong adsorption property to phosphorus and is a potential adsorbent.