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

作　　者：可欣 屈天鸽 钱文静 刘文刚[2] 烟征 KE Xin;QU Tiange;QIAN Wenjing;LIU Wengang;YAN Zheng(College of Energy and Environment,Shenyang Aerospace University,Shenyang 110136;School of Resources and Civil Engineering,Northeastern University,Shenyang 110819)

机构地区：[1]沈阳航空航天大学能源与环境学院,沈阳110136 [2]东北大学资源与土木工程学院,沈阳110819

出　　处：《环境科学学报》2022年第12期49-60,共12页Acta Scientiae Circumstantiae

基　　金：辽宁省兴辽英才计划(No.XLYC1807045)。

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(Q_(max)=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.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(Q_(max)=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.

关 键 词：砷酸盐 铁-镧/壳聚糖微球(FLCB) 吸附 金属氢氧化物 复合微球 网格结构 

分 类 号：X703[环境科学与工程—环境工程]