树脂基纳米FeOOH复合材料去除Cr(Ⅵ)性能研究  

Cr(VI)Removal by Nano-Sized FeOOH Modified Resin

作　　者：林雪莹 杨宇航 李冰 李平 吴锦华 LIN Xueying;YANG Yuhang;LI Bing;LI Ping;WU Jinhua(South China University of Technology,Guangzhou 510006,China)

机构地区：[1]华南理工大学环境与能源学院,广东广州510006

出　　处：《水处理技术》2023年第7期67-72,共6页Technology of Water Treatment

基　　金：国家重点研发计划项目(2019YFC1805902);国家自然科学基金(41977114);广东省水利科技创新项目(2016-26)。

摘　　要：通过浸渍法制备大孔强碱型树脂基纳米羟基铁复合材料(nFeOOH-D201)以提高树脂去除Cr(VI)的能力和再生性能。实验结果显示,由于羟基铁颗粒(20~100 nm)被均匀负载到D201表面,因此nFeOOH-D201不仅保留了D201的静电吸附能力,还获得羟基铁的络合能力,相比于D201其对Cr(VI)的去除率提高了24.1%,并表现出更强的抗其他阴离子如NO_(3)^(-)和SO_(4)^(2-)竞争吸附的能力;可采用醋酸对吸附后的nFeOOH-D201进行脱附,经过5次循环使用后,其对Cr(VI)的去除率依然可达33.9%,是D201的3.7倍;可使用1 mol/L盐酸溶解nFeOOH-D201表面的nFeOOH并重新负载,再生率达90%以上。研究结果表明,羟基铁改性可显著提高D201的Cr(VI)去除能力和再生性能。A macroporous strong alkaline resin-based nano-goethite composites(nFeOOH-D201)was developed with an impregnation method to improve the Cr(VI)removal capacity and regeneration performance of the resin.Due to the fact that nFeOOH particles(20-100 nm)were uniformly loaded on D201 surface,the nFeOOH-D201 not only maintained the original electrostatic adsorption ability of D201,but also obtained the complexation adsorption capacity of nFeOOH.Compared to D201,the nFeOOH-D201 achieved a 24.1%higher Cr(VI)removal efficiency,and a better selectivity for Cr(VI)in the competition of NO_(3)^(-)and SO_(4)^(2-).In addition,the used nFeOOH-D201 could be refreshed by dilute acetic acid with a 33.9%of Cr(VI)removal rate after five cycles,which was 3.7 times higher than that of D201.The invalid nFeOOH-D201 could be regenerated by stripping surficial iron oxides and reloaded with nFeOOH by the above impregnation method,and achieved a regeneration rate above 90%.Our results demonstrated that the introduction of nFeOOH could effectively improve the performance of D201 for Cr(VI)removal and its regeneration performance.

关 键 词：羟基铁 树脂 铬 改性 吸附 

分 类 号：X703.1[环境科学与工程—环境工程]