鸡粪制备的生物碳对水中磷的吸附去除研究  

Study on the adsorption of phosphate in aqueous solution by biochar derived from chicken manure

作　　者：胡菲菲[1] 邵庆国 

机构地区：[1]长江大学城市建设学院,湖北荆州434023 [2]华港燃气集团有限公司,河北沧州061000

出　　处：《环境污染与防治》2013年第2期67-70,77,共5页Environmental Pollution & Control

摘　　要：以鸡粪为原料热解制备的生物碳作为吸附剂,考察了水中磷在生物碳上的吸附动力学,以及吸附效果的主要影响因素,并对磷的去除机制做了初步探讨。结果表明:以鸡粪为原料制备的生物碳具有较高的灰分含量和较高的比表面积,这有利于其对磷的吸附;拟一级动力学模型能更好描述水中磷在生物碳表面的吸附行为,水中磷是通过吸附到生物碳表面的胶体和MgO颗粒上而得以去除的;磷在生物碳上的吸附等温线能较好用Freundlich、Langmuir-Freundlich模型来拟合,表明生物碳对磷的吸附是由非均质过程控制的;生物碳对磷的吸附作用受溶液pH的影响,这是由于pH影响溶液中磷的存在形式,而各种离子在生物碳表面的竞争吸附会影响磷的吸附效果;利用鸡粪热解产生的生物碳吸附去除水中磷是可行的,不仅成本低廉并且能够达到以废治废的目的。The biochar prepared from pyrolysis of chicken manure was used as sorbent to removal phosphate in aqueous solution. The kinetics, influence factors and mechanism of phosphate adsorption was preliminary discussed in this paper. The results showed that the obtained biochar had the property of high ash content and high specific surface area, which was benefit for phosphate adsorption. The pseudo first-order kinetics could better describe the dynamic behavior of phosphate adsorption on surface of biochar. The preliminary adsorption mechanism of phosphate removal was adsorption onto the colloidal and nano-sized MgO particles on biochar surface. Freundlich and Langmuir-Freundl- ich models fitted the adsorption isotherm better than Langmuir adsorption model, proved the heterogeneous process of phosphate adsorption, pH had significant effect on the adsorption process because it could influence the form of phos- phate in solution. The competitive adsorption of different ions was occurred on surface of sorbent, so it could decrease the phosphate adsorption capacity of biochar. In conclusion, the phosphate removal chicken manure biochar was cost- effective and feasible to application, which was a strategy of controlling waste by waste.

关 键 词：鸡粪 生物碳 除磷 吸附动力学 吸附等温线 

分 类 号：X703[环境科学与工程—环境工程]