载铁活性炭对水体中三价砷的去除实验研究

Experimental study on removal of arsenic in water by iron-loaded activated carbon

铁改性吸附剂用于水体中砷的去除研究是水处理技术领域的一个热点。以Fe^(2+)为改性剂,颗粒态活性炭(GAC)为载体,制备具有良好吸附特性的载铁活性炭材料(Fe-GAC),探讨其对水体中As(Ⅲ)的吸附性能,通过材料表征测试进一步揭示其作用机理。结果表明:在pH=9、固液比为0.8 g/L条件下,反应720 min后,Fe-GAC对10 mg/L As(Ⅲ)的吸附达到平衡,最大吸附量为10.343 mg/g;As(Ⅲ)初始浓度在1~20 mg/L范围时,Fe-GAC对其吸附量随着砷浓度和温度的增加而逐渐增大,该吸附过程符合Langmuir模型,拟合结果显示45℃时最大平衡吸附容量为135.86 mg/g;添加磷酸盐条件下对Fe-GAC除As(Ⅲ)具有抑制作用。

Research on the removal of arsenic from water by iron modified adsorbents is a hot topic in the field of water treatment technology.Fe^(2+)as modifier,with granular activated carbon(GAC)as a carrier,was prepared by iron load activated carbon material with good adsorption properties(Fe-GAC),discuss the performance of the adsorption of As(III)in water,further reveal its mechanism through material characterization tests.The results showed that:At pH=9 and solid-liquid ratio of 0.8 g/L,after 720 min of reaction,Fe-GAC reached an equilibrium adsorption of 10 mg/L As(Ⅲ),with a maximum adsorption capacity of 10.343 mg/g.When the initial concentration of As(Ⅲ)is in the range of 1~20 mg/L,the adsorption amount of Fe-GAC increases with the increase of arsenic concentration and temperature.The adsorption process fits the Langmuir model,and the fitting results show that the maximum equilibrium adsorption capacity at 45℃is 135.86 mg/g.Under the condition of adding phosphate in Fe-GAC except As(Ⅲ)has the inhibition.