Authors:Yue Cheng, Kaiming Liu, Gengmei Xing, Hui Yuan, Long Jing, and Yuliang Zhao
The water-solubilization of metallofullerenes is important for their potential applications, but their formation processes
are still not clear, and the formation yield is uncontrollable. In this paper, we quantitatively studied the water-solubilizing
process of Gd@C82 with hydroxylation reaction using ICP-MASS techniques. For the first time, it was found that the formation yield of the multihydroxylated
Gd@C82 is declined quickly with the break up of carbon cage of Gd@C82 in the hydroxylated processes. The observation revealed a way to control the hydroxylation processes and increase the formation
Authors:Jun Tang, Gengmei Xing, Hui Yuan, Xingfa Gao, Long Jing, Shukuan Wang, Yue Cheng, and Yuliang Zhao
The electronic properties of the metal atoms encaged in a fullerence cage were investigated using synchrotron X-ray photoelectron
spectroscopy. Systematic variations in photoemission of valence band of Gd@C82, Gd@C82(OH)12, and Gd@C82(OH)22 were observed in Gd 5p levels. The results suggest that the electronic properties of the inner metal atom can be efficiently
modulated by surface chemistry of the fullerene cage.
In this paper, uptake and elimination of lanthanum by excised roots of Triticum aestivum L. in various conditions were studied. Lanthanum concentrations in the roots were determined by neutron activation analysis.
Results showed that the uptake of La in the excised root was almost independent of vitality, and the bonding of La with the
roots was tight, but could be removed by EDTA treatment. There was significant dose-dependent accumulation of La in the excised
roots within the experimental concentration (0–40 µmol/l).
Nanosized copper particles are widely used in fields of lubricants, polymers/plastic, metallic coating and ink. Recently,
we found that copper particles in different sizes can lead to different toxicological effects. To clarify the target organs
of copper particles of different sizes, the inductively coupled plasma mass spectroscopy (ICP-MS) was employed to evaluate
the distribution of copper in different organs of mice after a single dose oral exposure. The results suggest that the main
target organs for copper nanoparticles are kidney, liver and blood. Liver is the main damaged organ.
Recently, it was reported that the toxicity of copper particles increases with the decrease of the particle size on a mass
basis. To understand this phenomenon, inductively coupled plasma mass spectrometry (ICP-MS) techniques and in vitro chemical
studies were carried out to explore how they produce toxicity in vivo. The results suggest that when the sizes of particles
become small and down to a nanoscale, copper becomes extremely reactive in a simulative intracorporeal environment. The nanosized
copper particles consume the hydrogen ions in stomach more quickly than micron ones. These processes further convert the copper
nanoparticles into cupric ions whose toxicity is very high in vivo.
Authors:Yalan Liu, Liyong Yuan, Yali Yuan, Jianhui Lan, Zijie Li, Yixiao Feng, Yuliang Zhao, Zhifang Chai, and Weiqun Shi
Uranium is one of the most hazardous heavy metal due to its long half-life radioactivity, high toxicity and mobility as aqueous
uranyl ion (UO22+) under ordinary environmental conditions. Herein, amino functionalized SBA-15 (APSS) was developed as a rapid and efficient
sorbent for removal of U(VI) from the environment. The APSS sample was synthesized by grafting method and was characterized
by SEM, NMR, SAXS, and N2 sorption/desorption isothermal experiments. The sorption of U(VI) by APSS was investigated under different conditions of
pH, contact time, initial U(VI) concentration, ionic strength and solid–liquid ratio. The results show that the sorption of
U(VI) by APSS is strongly dependent on pH but independent of ionic strength and solid–liquid ratios (m/V). The sorption is ultrafast with an equilibrium time of less than 30 min, and the sorption capacity is as large as 409 mg/g
at pH 5.3 ± 0.1. Besides, the U(VI) sorption by APSS from extremely diluted solution and the desorption of U(VI) from APSS
were also studied. It is found that 100 mg of APSS can almost completely remove the U(VI) ions from 4 L aqueous solution with
the U(VI) concentration as low as 4.2 ppb and the sorbed U(VI) can be completely desorbed by 0.1 mol/L nitric acid. The results
strongly reveal the high performance of the APSS material in the removal and preconcentration of U(VI) from the aqueous solution.
Authors:Wenbin Cao, Xingfa Gao, Li Qu, Zhenlin Chen, Genmei Xing, Jun Tang, Huan Meng, Zhen Chen, and Yuliang Zhao
It was found that Sc2@C84 or Sc2O3 could be “kicked” into the cavities of single wall carbon nanotubes (SWNTs) by reactor neutrons. Neutron irradiation also
efficiently induces coalescing reactions between two fullerene cages with an atom-spacer, forming a C2m=C=C2n type of carbon nanomaterials. This process provides a new subject of studying interactions (and their consequences) of neutrons
with nanoparticles, which may put new insights for neutron sciences.