吸水凝胶包覆型纳米零价铁对水中土霉素的去除  

Removal of OTC from water using hydrogel coated nZVI

作　　者：王祎旸 史慧琳 袁梦[1] 王学江[1] WANG Yiyang;SHI Huilin;YUAN Meng;WANG Xuejiang(State Key Laboratory of Pollution Control and Resource Reuse,College of Environmental Science and Engineering,Tongji University,Shanghai 200082,China)

机构地区：[1]同济大学环境科学与工程学院,污染控制与资源化研究重点实验室,上海200082

出　　处：《环境工程学报》2023年第6期1828-1840,共13页Chinese Journal of Environmental Engineering

基　　金：国家重点研发计划项目(2021YFC3201302)。

摘　　要：为解决纳米零价铁(nZVI)在应用中易团聚、易氧化的局限,以聚丙烯酸钠和聚丙烯酰胺的共聚物(PPAA)为载体,以茶多酚为还原剂,采用绿色合成法制备吸水凝胶包覆型纳米零价铁(PPAA-nZVI),并将其用于水中土霉素(OTC)的去除。通过SEM、BET、FTIR和XPS等表征了PPAA-nZVI的微观形貌和物化性质,探讨了OTC初始质量浓度、溶液初始pH和共存物质对OTC去除效果的影响。结果表明,茶多酚能够还原制备nZVI,且成功将nZVI负载到PPAA内。随着初始OTC质量浓度的增加,OTC的去除率逐渐增加,当PPAAnZVI投加量为0.5 g·L^(-1)、OTC初始质量浓度为300 mg·L^(-1)时,材料对OTC的去除量达到最大481 mg·g^(-1)。pH对材料去除OTC的影响较小。PO_(4)^(3-)和HA的存在对PPAA-nZVI去除OTC均有抑制作用。材料去除OTC主要通过Fenton氧化、OTC与Fe^(3+)的络合以及材料表面活性位点的吸附3种途径。以上研究结果可为nZVI在净化污染水体中的OTC提供一种有前景的方法。In order to solve the limitation of nanoscale zero-valent iron(nZVI) which is easy to agglomerate and oxidize in application,hydrogel coated nanoscale zero-valent iron(PPAA-nZVI) was synthesized using copolymer of polyacrylate sodium and polyacrylamide(PPAA) as the carrier and tea polyphenol as the reducing agent,and it was used to remove oxytetracycline(OTC) in water.The microscopic morphology and physicochemical properties of PPAA-nZVI composites were investigated by SEM,BET,FTIR and XPS,and the effects of initial concentration of OTC,initial pH of solution and coexisting substances on OTC removal were studied.Results showed that nZVI could be prepared by tea polyphenol reduction,and it could be successfully embedded in PPAA.The removal capacity of OTC increased gradually with the increase of initial concentration of OTC.At PPAA-nZVI dosage of 0.5 g·L^(-1) and OTC initial concentration of 200 mg·L^(-1),the maximum removal capacity of OTC reached 481 mg·g^(-1).pH had slight effect on the removal of OTC.The presence of PO_4^(3-)and HA inhibited the removal of OTC.There were three main ways to remove OTC:Fenton oxidation,complexation of OTC with Fe^(3+) and adsorption of OTC on the active sites of PPAA-nZVI surface.This study presents a promising solution to remove OTC from the contaminated waterbody by nZVI.

关 键 词：纳米零价铁 吸水凝胶 绿色合成 土霉素 

分 类 号：X703[环境科学与工程—环境工程]