【摘要】 采用廉价易得的钢渣作为吸附剂,研究其对水中磷、砷的吸附特性。结果表明,随着钢渣投加量的增加,磷、砷的去除率增加,在磷的初始浓度小于50 mg/L,投加量为0.75 g/100 m L时,磷去除率达99%以上;在砷的初始浓度小于10 mg/L,投加量为6 g/100 m L时,砷去除率也可达99%以上。p H影响钢渣对磷、砷的去除性能,中性条件下,钢渣对磷的去除效果最好;p H 9~11,有利于钢渣对砷的去除。钢渣对磷、砷的吸附均符合Langergren准二级动力学模型,具有"快速吸附、缓慢平衡"的特点。钢渣是一种良好的吸附除磷材料,对砷也有一定的吸附能力,磷和砷在钢渣上的吸附为竞争性吸附。更多还原

【Abstract】 Pollution of phosphorus and arsenic has caused the eutrophication of many lakes. In the present study,the adsorption potential of the steel slag for the removal of phosphorus and arsenic from aqueous solutions was investigated.The results show that the removal rates of phosphorus and arsenic increase with steel slag dose. When the initial concentration of phosphorus is less than 50 mg/L,the phosphorus removal rate can reach above 99% with a steel slag dose of 0.75 g/100 m L. When the initial concentration of arsenic is less than 10 mg/L,the arsenic removal rate can be over 99% with a steel slag dose of 6 g/100 m L. It finds that p H value has great effects on the removal rates of the phosphorus and arsenic. The phosphorus reaches its highest removal by steel slag under neutral condition,whereas,arsenics removal by steel slag is most effective in p H 9—11. The adsorptions of phosphorus and arsenic by steel slag are well fitted with Langergren pseudo-second-order kinetics model,which adsorption process can be characterized by rapid absorption and slow balance. Steel slag is a good adsorption material for phosphorus and also has certain adsorption capacity for arsenic,and the adsorptions of phosphorus and arsenic with steel slag are competitive adsorption.更多还原