@article {SHAN2015252,
	title = {Removal of Hg(II) by poly(1-vinylimidazole)-grafted Fe3O4@SiO2 magnetic nanoparticles},
	journal = {Water Research},
	volume = {69},
	year = {2015},
	pages = {252-260},
	abstract = {Fe3O4@SiO2 magnetic nanoparticles modified by grafting poly(1-vinylimidazole) oligomer (FSPV) was fabricated as a novel adsorbent to remove Hg(II) from water. Fourier transform infra-red spectroscopy confirmed the successful grafting of oligomer, and thermogravimetric analysis showed FSPV had a high grafting yield with organic content of 22.8\%. Transmission electron microscopy image displayed that FSPV particles were polymer-coated spheres with size of 10{\textendash}20~nm. With saturation magnetization of 44.7 emu/g, FSPV particles could be easily separated from water with a simple magnetic process in 5~min. The Hg(II) adsorption capacity of FSPV was found to be 346~mg/g at pH 7 and 25~{\textdegree}C in 10~mM NaCl. Moreover, the removal of Hg(II) by FSPV was not obviously affected by solution pH (from 4 to 10) or humic acid (up to 8~mg/L as TOC). The presence of seven common ions including Na+, K+, Ca2+, Mg2+, Cl-, NO3-, and SO42- (up to 100~mM ionic strength) slightly increased the adsorption of Hg(II) by FSPV. X-ray photoelectron spectroscopy analysis revealed that the N atom of the imidazole ring was responsible for the bonding with Hg(II), whereas the bonding of Hg with N did not result in cleavage of Hg{\textendash}Cl bond in HgCl2 and HgClOH. The regeneration of Hg(II)-loaded FSPV could be achieved with 0.5~M HCl rapidly in 10~min, and the removal of Hg(II) maintained above 94\% in five consecutive adsorption{\textendash}desorption cycles. Therefore, FSPV could serve as a promising adsorbent for Hg(II) removal from water.},
	keywords = {Adsorption, Imidazole, Magnetic nanoparticle, magnetite, mercury, Silica},
	issn = {0043-1354},
	doi = {https://doi.org/10.1016/j.watres.2014.11.030},
	url = {https://www.sciencedirect.com/science/article/pii/S0043135414008008},
	author = {Chao Shan and Zhiyao Ma and Meiping Tong and Ni, Jinren}
}
