title: Reduction of aqueous CrVI using nanoscale zero-valent iron dispersed by high energy electron beam irradiation.
abstract: High energy electron beam (HEEB) irradiation was used to disperse nanoscale zero-valent iron (NZVI) for reduction of CrVI to CrIII in aqueous solution. Pore size distribution, scanning electron microscopy and X-ray diffraction characterizations demonstrated that HEEB irradiation could effectively increase the dispersion of NZVI resulting in more active reduction sites of Crvi on NZVI. Batch reduction experiments indicated that the reductive capacity of HEEB irradiation-modified NZVI (IMNZVI) was significantly improved, as the reductive efficiency reached 99.79% under the optimal conditions (electron beam dose of 30 kGy at 10 MeV, pH 2.0 and 313 K) compared with that of raw NZVI (72.14%). Additionally, the NZVI was stable for at least two months after irradiation. The modification mechanism of NZVI by HEEB irradiation was investigated and the results indicated that charge and thermal effects might play key roles in dispersing the NZVI particles.
authors: Key Laboratory of Ion Beam Bioengineering, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, People's Republic of China. dqcai@ipp.ac.cn zywu@ipp.ac.cn.
authors: Jing
authors: J
authors: Zhang
authors: Guilong
authors: G
authors: Zhang
authors: Min
authors: M
authors: Wang
authors: Kang
authors: K
authors: Zheng
authors: Dongqing
authors: D
authors: Cai
authors: Zhengyan
authors: Z
authors: Wu