A Superfast Hexavalent Chromium Scavenger: Magnetic Nanocarbon Bridged Nanomagnetite Network with Excellent Recyclability
In this work, a nanocarbon bridged nanomagnetite network (NC-NMN) is developed through the electrospinning of epichlorohydrin functionalized polystyrene (f-PS), followed by the direct calcination off-PS and ferric nitrate, which is capable of superfast removing hexavalent chromium (Cr(Ⅵ)) from polluted water within only 15 s benefiting from its gridding framework, with an adsorption rate constant of 1.64 g mg-1 min-1 according to the pseudo-second-order kinetics.The well-fitted Langmuir isotherm model indicates a monolayer adsorption for Cr(Ⅵ) on NC-NMN.The thermodynamic parameters including negative △G0 and positive △H0 demonstrate that the Cr(Ⅵ) adsorption on NC-NMN is spontaneous and endothermic.The Cr(Ⅵ) adsorption retention, which is only 3.8%, is achieved for NC-NMN after five cycles, exhibiting a prominent stability and an excellent recyclability.X-ray photoelectron spectroscopy (XPS), zeta potential and energy-filter transmission electron spectroscopy (EFTEM) results illustrate that both the electrostatic attraction and the network structure of NC-NMN are responsible for the superior Cr(Ⅵ) adsorption performance.This work intends to provide a new method to design the novel structure materials for polluted water treatment.
magnetic nanocarbon bridged nanomagnetite hexavalent chromium recyclability adsorption
Chao Ma Hongbo Gu
Shanghai Key Lab of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University, Shanghai 200092, P.R.China
国际会议
北京
英文
48-49
2017-11-09（万方平台首次上网日期，不代表论文的发表时间）