表面活性剂改性的磁性纳米颗粒对重金属吸附特征  

Study on the Adsorption Characteristics of Heavy Metal by Surfactant-modified Magnetic Nanoparticles

作　　者：史豪 王雅 赵尉伶 罗艳丽[1] 杨方源 周金龙[4] SHI Hao;WANG Ya;ZHAO Yuling;LUO Yanli;YANG Fangyuan;ZHOU Jinlong(College of Resources and Environment,Xinjiang Agricultural University,Urumqi 830052,China;College of Electronics and Engineering,Yili Normal University,Yili 835000,Xinjiang,China;College of Mathematics and Science,Xinjiang Agricultural University,Urumqi 830052,China;College of Water Resources and Civil Engineering,Xinjiang Agricultural University,Urumqi 830052,China)

机构地区：[1]新疆农业大学资源与环境学院,乌鲁木齐830052 [2]伊犁师范大学电子与工程学院,新疆伊犁835000 [3]新疆农业大学数理学院,乌鲁木齐830052 [4]新疆农业大学水利与土木工程学院,乌鲁木齐830052

出　　处：《材料导报》2025年第6期54-61,共8页Materials Reports

基　　金：国家自然科学基金(42067053,41761097);新疆维吾尔自治区自然科学基金(2022D01B20);中国博士后科学基金(2020M673643XB);新疆水利工程安全水防灾防治重点实验室2022开放学科项目(ZDSYS-JS-2022-13)。

摘　　要：分别利用四种不同电性的表面活性剂——阴离子表面活性剂SDS、阳离子表面活性剂CTAB,以及两性离子表面活性剂SNC 16和NPC 16——对四氧化三铁表面进行改性,制备得到Fe_(3)O_(4)@SDS、Fe_(3)O_(4)@CTAB、Fe_(3)O_(4)@SNC 16和Fe_(3)O_(4)@NPC 16(统称为“Fe_(3)O_(4)@surfactants”)磁性纳米颗粒,并采用XRD、TEM、FTIR、振动样品磁强计(VSM)和XPS对它们进行表征分析,使用吸附动力学、吸附等温线和吸附热力学探究表面活性剂对Fe_(3)O_(4)的As(Ⅲ)吸附性能的影响。结果表明,Fe_(3)O_(4)@surfactants颗粒近似为球形,平均粒径约10 nm,饱和磁化强度均大于70 emu·g-1,可有效地从溶液中分离。Fe_(3)O_(4)@surfactants对As(Ⅲ)的吸附在60 min内达到平衡,吸附过程符合准二级动力学模型和Freundlich等温线模型,说明其机理是以化学吸附为主的多分子层吸附。在相同条件下,Fe_(3)O_(4)@CTAB对As(Ⅲ)的吸附最强(最大吸附容量为55.174 mg/g),远高于其他复合材料,并且循环使用五次后对As(Ⅲ)的去除率保持在初始值的85%。本工作的结果为开发有效去除水中As(Ⅲ)的新型功能化纳米吸附材料提供了参考。Fe_(3)O_(4)@SDS,Fe_(3)O_(4)@CTAB,Fe_(3)O_(4)@SNC 16,and Fe_(3)O_(4)@NPC 16(collectively called“Fe_(3)O_(4)@surfactants”)nanoparticles with good adsorption properties were prepared in this work by surface modification of ferric oxide using four kinds of surfactants differing in charge polarity,i.e.,SDS(anionic surfactant),CTAB(cationic surfactant),and SNC 16 and NPC 16(amphoteric surfactants).The prepared magnetic nanoparticles were characterized by means of XRD,TEM,FTIR,vibrating-sample magnetometry(VSM),and XPS.The effects of surfactant modification on the performance of magnetic Fe_(3)O_(4)for adsorbing As(Ⅲ)were investigated by adsorption kinetics,adsorption isotherms,and ad-sorption thermodynamics.The prepared Fe_(3)O_(4)@surfactants particles were approximately spherical,with average particle sizes of around 10 nm.All the Fe_(3)O_(4)@surfactants had saturation magnetizations larger than 70 emu·g-1,making them magnetically separable from solutions.The ad-sorption processes of As(Ⅲ)by Fe_(3)O_(4)@surfactants could reach equilibrium within 60 min,and corresponded well with the pseudo-second order kinetic model and the Freundlich isotherm expression,indicating the mechanisms of chemisorption-dominant multi-molecular-layer adsorption.Un-der the same conditions,Fe_(3)O_(4)@CTAB showed the highest adsorption capacity for As(Ⅲ)(55.174 mg/g),largely superior to the other Fe3O4@surfactants,and could maintain 85%of its initial As(Ⅲ)removal efficiency after five cycles of reuse.This study provides technical support for developing novel magnetically separable nano-sorbent materials effective in removing As(Ⅲ)from water.

关 键 词：四氧化三铁 表面活性剂 三价砷 纳米材料 吸附 

分 类 号：TB321[一般工业技术—材料科学与工程] X52[环境科学与工程—环境工程]