粉煤灰镧改性吸附水中磷的性能研究  

Study on Lanthanum Modification of Fly Ash and the Performance of Phosphorus Adsorption in Water

作　　者：梁旭华[1] 石家豪 韩非[2] LIANG Xuhua;SHI Jiahao;HAN Fei(Tangshan Municipal Construction Corporation,Tangshan,063000,China;School of Civil and Transportation Engineering,Hebei University of Technology,Tianjin,300401,China)

机构地区：[1]唐山市市政建设总公司,河北唐山063000 [2]河北工业大学,天津300401

出　　处：《粉煤灰综合利用》2024年第1期13-17,共5页Fly Ash Comprehensive Utilization

基　　金：国家自然科学基金(51608165)。

摘　　要：将粉煤灰与碳酸钾混合后焙烧,再浸渍硝酸镧,制备出镧改性粉煤灰(La-FA)。通过多种手段对La-FA进行了表征,并研究了其对含磷废水的吸附性能。结果表明:La-FA表面形成许多孔隙,具有更多吸附位点和羟基官能团,硅和铝含量的增加。La-FA零点电位的pH值为5.8。当水中磷的质量浓度为30 mg/L、温度为20℃、pH为4.1时,投加2 g/L的La-FA且吸附时间为20 min时,磷去除率可达98%,吸附量为24.13 mg/g。La-FA对磷的吸附过程可分为三个阶段,符合Langmuir等温吸附模型和拟二级吸附动力学模型。吸附过程是自发进行的,且为吸热反应,吸附机理为离子交换。Lanthanum-modified fly ash(La-FA)was prepared by mixing fly ash with potassium carbonate and impregnating lanthanum nitrate.It was characterized by various means and used in the adsorption of phosphorous-containing wastewater.The surface of La-FA has many pores and more adsorption sites and hydroxyl functional groups,and the content of silicon and aluminum was increased to facilitate the adsorption of phosphorus.The increase in pH caused the potential of the La-FA surface to gradually decrease,and its zero potential has a pH of 5.8.The adsorption results showed that when the initial phosphorus mass concentration was 30 mg/L,the temperature was 20℃,the solution pH was 4.1,the La-FA dosage was 2 g/L,and the adsorption time was 20 min,the phosphorus removal rate reached 98%,and the adsorption capacity was 24.13 mg/g.The adsorption process of La-FA on phosphorus can be divided into three stages,which conform to the Langmuir isothermal adsorption model and quasi-secondary kinetic model,the adsorption can be carried out spontaneously,the reaction process is endothermic,and the adsorption mechanism is ion exchange.

关 键 词：粉煤灰 镧改性 吸附 磷 

分 类 号：X703[环境科学与工程—环境工程]