Fe_(3)O_(4)@PVAm磁性纳米复合粒子的制备及其染料吸附性能  

Preparation of Fe_(3)O_(4)@PVAm magnetic nanoparticle and its dye adsorption property

作　　者：兰浩 王玉路[1,2] 靳丽强 修绍迪[1,2] 杨宏 罗荣 LAN Hao;WANG Yulu;JIN Liqiang;XIU Shaodi;YANG Hong;LUO Rong(School of Light Industry and Engineering,Qilu University of Technology(Shandong Academy of Sciences),Jinan 250353,China;Key Laboratory for Green Technology of Leather Manufacture,China National Light Industry Council,Jinan 250353,China)

机构地区：[1]齐鲁工业大学(山东省科学院)轻工科学与工程学院,山东济南250353 [2]中国轻工业生态制革重点实验室,山东济南250353

出　　处：《中国皮革》2021年第7期63-73,81,共12页China Leather

基　　金：国家自然基金项目(22078165);山东省重点研发计划(2019GGX102028)。

摘　　要：使用硫酸铝将两性聚乙烯胺(PVAm)固载于纳米Fe_(3)O_(4)表面制备了富含氨基的磁性纳米复合粒子(Fe_(3)O_(4)@PVAm),并将其用于去除水体中的阴离子染料。采用X射线衍射(XRD)、红外光谱(FT-IR)、X射线光电子能谱(XPS)、扫描电子显微镜(SEM)、振动样品磁强计(VSM)分别表征了复合粒子的结构和磁响应性能。与Fe_(3)O_(4)粒子相比,Fe_(3)O_(4)@PVAm复合粒子的XRD图谱在2θ角15°~25°处出现新的衍射峰,红外光谱中出现了N-H、C=O及C-N键的振动吸收峰,X射线光电子能谱在399.5 eV处出现了N1s的特征峰,说明PVAm已成功固载到Fe_(3)O_(4)粒子上。VSM分析表明,Fe_(3)O_(4)@PVAm具有较好的磁响应性。SEM分析证实Fe_(3)O_(4)@PVAm的平均粒径约为24 nm。选取酸性嫩黄染料为吸附对象,考察了Fe_(3)O_(4)@PVAm对水体中染料的吸附性能。在pH为3、温度为50℃时,Fe_(3)O_(4)@PVAm对酸性嫩黄染料的最大吸附容量达到1188 mg/g,吸附过程符合Langmuir吸附等温模型及拟二级速率模型。经10次吸附-脱附循环使用后,Fe_(3)O_(4)@PVAm复合粒子的吸附容量可以保持在最大吸附容量的75%以上。Amino-functionalized magnetic nanoparticles(Fe_(3)O_(4)@PVAm)were fabricated by facilely crosslinking amphoteric polyvinylamine(PVAm)using Al2(SO4)3 on Fe_(3)O_(4)cores and applied as a high-performance absorbent to remove acid dye from water.X-ray diffraction(XRD),infrared spectroscopy(FT-IR),X-ray photoelectron spectroscopy(XPS),scanning electron microscopy(SEM)and vibrating sample magnetometer(VSM)were used to characterize the structure and magnetic response properties of the composite particles.Compared with naked Fe_(3)O_(4)nanoparticles,new broad diffraction peaks were recorded in the 2θrange of 15°~25°on the X-ray diffraction patterns of Fe_(3)O_(4)@PVAm,new adsorption bands of N-H,CO and C-N appeared on their FT-IR spectra,and new peaks at 399.5 eV(N1 s)were detected on the XPS spectra,evidencing the successful introduction of PVAm.It was proved that the Fe_(3)O_(4)@PVAm possessed clearly magnetic response by VSM analysis,and SEM images revealed that the mean particle size of Fe_(3)O_(4)@PVAm was about 24 nm.The adsorption capacities of Fe_(3)O_(4)@PVAm to acid light yellow G(AYG)were studied.Its maximum adsorption capacity was 1188 mg/g obtained at pH 3 and 50℃.The adsorption process can be described by using the Langmuir and the pseudo-second-order model.Additionally,more than 75%adsorption capacity of Fe_(3)O_(4)@PVAm was remained after 10 cycles of adsorption-desorption process.

关 键 词：磁性纳米颗粒 两性聚乙烯胺 吸附 解吸 阴离子染料 

分 类 号：TQ42[化学工程]