中文摘要：

对Fe（Ⅲ）单独沉淀、Fe（Ⅱ）单独沉淀、Ce（Ⅳ）单独沉淀、Fe（Ⅲ）-Ce（Ⅳ）和Fe（Ⅱ）-Ce（Ⅳ）沉淀5种制备体系产物去除As（Ⅴ）性能进行了比较，结果显示Fe（Ⅱ）-Ce（Ⅳ）体系最优。进一步优化评价Fe（Ⅱ）-Ce（Ⅳ）制备体系中铈的加入量。基于经济一性能平衡的考虑，优选得到了Fe（Ⅱ）-Ce（Ⅳ）体系中Ce（Ⅳ）加入量为0．03mol/L的吸附剂Fe（Ⅱ）-Ce（Ⅳ）03（简称FC），其饱和吸附容量达到85mg／g。动力学测试表明，FC去除As（Ⅴ）过程符合准二级反应动力学过程。在pH=4～7范围内，吸附容量受pH值影响不明显。对FC材料造粒后的吸附剂颗粒进行再生寿命评价，批量试验结果显示其能够重复利用7次。颗粒柱试验结果表明，在空^U流速（SV）分别为10h^-1、20h^-1、30h^-1时，出水砷穿透前（〉10μg／L）分别刘应4000、2400、2160倍的倍柱体积处理赶。对FC材料进行的表征测试显示，FC呈无定形结构，其质子位密度为9．97个／nm^2，质子化常数pK1=3．09，pK2=-10．02。

英文摘要：

Adsorbents were prepared by a hydrolysis-precipitation procedure using pure Fe（Ⅲ）, Fe（Ⅱ）, Ce（Ⅳ） or Fe（Ⅲ）-Ce（Ⅳ） and Fe（Ⅱ）-Ce（Ⅳ） as initial reagents. Their performance for As（V） removal were evaluated. The results showed that Fe（Ⅱ）-Ce（Ⅳ） was the most optimal system to produce high performance adsorbent. The doping amount of Ce in Fe（Ⅱ）-Ce（Ⅳ） was optimized in considering a balance of perfornlance and production cost. Hence, an initial adding concentration of 0.03 mol/L Ce（Ⅳ） which yielded adsorption capacity of 85 mg/g As（Ⅴ） was thought to be optimal, and it was notated as FC. The adsorption of As（Ⅴ） on FC powder was found to obey pseudo second-order rate expression. The optimal range of operation pit range for As（Ⅴ） removal hy FC was within 4- 7. As for practical usage, the powdered adsorbent should be fabricated into particles. The repeating adsorption-desorption experiment showed that granular FC adsorbent could be cffectivcly regenerated for 7 times by using 0.01 mol/L NaOH. The column test under specific flow rate of 10 h^-1, 20 h^-1 and 30 h^-1 exhibited that 4 000, 2400 and 2 160 bed volumes of water were treated before the breakthrough of As（V）. The adsorbent were characterized as well by using X-ray diffraction （XRD） and surface potential titration technique. The XRD pattern revealed that it was totally amorphous. The site density of proton was about 9.97 sites/nm^2 and the pK1 as well as pK2 value was 3.09 and - 10.02, respectively.