负载纳米水合氧化铁活性炭去除水中铅的实验研究

通过共沉淀法制备一种负载纳米水合氧化铁活性炭,研究其对铅的吸附性能、负载前后活性炭的结构的影响,并进行TEM和XRD表征分析。利用动态小柱实验探究不同p H值、进水浓度和空床接触时间对铅吸附能力的影响,同时比较负载前后活性炭处理实际河道水中铅的吸附穿透曲线。结果表明:无定型的纳米水合氧化铁成功负载于活性炭上,负载后的活性炭显著提高了铅的吸附性能,其对铅的吸附容量随p H值、空床接触时间的增大而增加,进水浓度的变化基本不影响铅的吸附容量。以实际河道水为处理对象,得出负载前后的活性炭穿透点运行的床体积分别为1233和11004,显著提高了9倍,表明负载纳米水合氧化铁活性炭可以有效去除实际水体中的铅,具有良好的应用前景。

Experiment on lead removal in water by nanoscale hydrated ferric oxide loaded activated carbon

The paper prepared a nanoscale hydrated ferric oxide loaded activated carbon by co-precipitation procedure so as to study its adsorption capacity to lead and structure variation of activated carbon before and after loading and also carried out TEM and XRD characterized analysis.It used dynamic small column test to study the effect of pH, feed concentrations and empty bed contact time on activated carbon's adsorption capacity to lead, and prepared breakthrough curves of unloaded and loaded activated carbon in natural river water. Results indicated that amorphous nanoscale hydrated ferric oxide can be successfully loaded in activated carbon which can improve the adsorption capacity of activate carbon for lead after loaded. The adsorptive capacity increases with the increase of pH and empty bed contact time.In addition, the water concentration does not affect the adsorption capacity of lead.The paper took natural river water as treatment object and got the result that the operational bed volume of activated carbon at breakthrough point before and after loaded are 1233 and 11004 respectively and increased by 9 times.The study showed that amorphous nanoscale hydrated ferric oxide loaded activated carbon can effectively remove lead in actual wastewater and the method has good application prospect.