研究报告
可欣,屈天鸽,钱文静,刘文刚,烟征.铁-镧/壳聚糖复合材料在宽域pH范围内高效去除废水中的砷酸盐[J].环境科学学报,2022,42(12):49-60
铁-镧/壳聚糖复合材料在宽域pH范围内高效去除废水中的砷酸盐
- Highly efficient removal of arsenate from wastewater over a wide range of pH value by Fe-La/Chitosan composite material
- 基金项目:辽宁省兴辽英才计划(No.XLYC1807045)
- 可欣
- 沈阳航空航天大学能源与环境学院,沈阳 110136
- 屈天鸽
- 沈阳航空航天大学能源与环境学院,沈阳 110136
- 钱文静
- 沈阳航空航天大学能源与环境学院,沈阳 110136
- 刘文刚
- 东北大学资源与土木工程学院,沈阳 110819
- 烟征
- 沈阳航空航天大学能源与环境学院,沈阳 110136
- 摘要:采用原位沉淀方法制备了一种具有网格结构的铁-镧/壳聚糖微球(FLCB),该吸附剂可在较宽的pH范围内高效吸附砷酸盐.与壳聚糖微球(CB)相比,铁和镧离子的加入扩大了吸附剂的pH耐受范围.当pH=10时,其对砷酸盐的吸附效率高达80%.Fe—O键和La—O键的加入增加了FLCB的总正电荷密度,在一定程度上提高了FLCB的吸附容量.拟二级动力学模型和Langmuir吸附等温线(Qmax=105.01 mg·g-1)可以更好地描述吸附过程.FLCB在砷酸盐上的吸附机理为:双齿双核或单齿单核形成的表面络合物占主导地位,吸附剂与砷酸盐的静电吸引占次要地位.
- Abstract:An adsorbent Fe-La/chitosan beads (FLCB) that has a network structure and achieves high-efficiency adsorption of arsenate over a wide range of pH conditions was prepared by in-situ preparation method. Compared with chitosan beads(CB), the addition of iron and lanthanum ions expands the tolerable pH range of the adsorbent. When pH=10, its adsorption efficiency for arsenate is as high as 80%. The addition of Fe—O bond and La—O bond increases the overall positive charge density, and improves the adsorption capacity of FLCB to a certain extent. The pseudo-second-order kinetic model and Langmuir adsorption isotherm (Qmax=105.01 mg·g-1) can be used to better describe the adsorption process. The adsorption mechanism of FLCB on arsenate is: the surface complexation of the formation of bidentate binuclear or monodentate mononuclear complex is the dominant position, and the electrostatic attraction of adsorbent and arsenate takes the minor position.