Efficient bacterial capture with amino acid modified magnetic   nanoparticles

doi:10.1016/j.watres.2013.11.045

CORC > 北京大学 > 环境科学与工程学院

	Efficient bacterial capture with amino acid modified magnetic nanoparticles
	Jin, Yinjia ; Liu, Fei ; Shan, Chao ; Tong, Meiping ; Hou, Yanglong
刊名	水研究
	2014
关键词	Magnetic nanoparticles Bacteria capture Amino acid Competitive anions Natural organic matter Reuse NATURAL ORGANIC-MATTER IRON-OXIDE NANOPARTICLES PATHOGEN DETECTION CARBON NANOTUBES AFFINITY CAPTURE HEAVY-METALS HUMIC-ACID REMOVAL DEPOSITION WATER
DOI	10.1016/j.watres.2013.11.045
英文摘要	Traditional chemical disinfectants are becoming increasingly defective due to the generation of carcinogenic disinfection byproducts and the emergence of antibiotic-resistant bacterial strains. Functionalized magnetic nanoparticles yet have shown great application potentials in water treatment processes especially for bacterial removal. In this study, three types of amino acids (arginine, lysine, and poly-L-lysine) functionalized Fe3O4 nanoparticles (Fe3O4@Arg, Fe3O4@Lys, and Fe3O4@PLL) were prepared through a facile and inexpensive two-step process. The amino acid modified Fe3O4 nanoparticles (Fe3O4@AA) showed rapid and efficient capture and removal properties for both Gram-positive Bacillus subtilis (B. subtilis) and Gram-negative Escherichia coli 15597 (E. coli). For both strains, more than 97% of bacteria (initial concentration of 1.5 x 10(7) CFU mL(-1)) could be captured by all three types of magnetic nanoparticles within 20 min. With E. coli as a model strain, Fe3O4@AA could remove more than 94% of cells from solutions over a broad pH range (from 4 to 10). Solution ionic strength did not affect cell capture efficiency. The co-presence of sulfate and nitrate in solutions did not affect the capture efficiency, whereas, the presence of phosphate and silicate slightly decreased the removal rate. However, around 90% and 80% of cells could be captured by Fe3O4@AA even at 10 mM of silicate and phosphate, respectively. Bacterial capture efficiencies were over 90% and 82% even in the present of 10 mg L-1 of humic acid and alginate, respectively. Moreover, Fe3O4@AA nanoparticles exhibited good reusability, and greater than 90% of E. coli cells could be captured even in the fifth regeneration cycle. The results showed Fe3O4@AA fabricated in this study have great application potential for bacteria removal from water. (C) 2013 Elsevier Ltd. All rights reserved.; Engineering, Environmental; Environmental Sciences; Water Resources; SCI(E); EI; PubMed; 7; ARTICLE; tongmeiping@iee.pku.edu.cn; hou@pku.edu.cn; 124-134; 50
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/158793]
专题	环境科学与工程学院工学院
推荐引用方式 GB/T 7714	Jin, Yinjia,Liu, Fei,Shan, Chao,et al. Efficient bacterial capture with amino acid modified magnetic nanoparticles[J]. 水研究,2014.
APA	Jin, Yinjia,Liu, Fei,Shan, Chao,Tong, Meiping,&Hou, Yanglong.(2014).Efficient bacterial capture with amino acid modified magnetic nanoparticles.水研究.
MLA	Jin, Yinjia,et al."Efficient bacterial capture with amino acid modified magnetic nanoparticles".水研究 (2014).