The alkali heat modification used in coal gangue. And the adsorption effect of MB on original gangue and modified gangue were observed. The results were showed that removal rate of MB was 96.87% and 45.45% by modified gangue and original gangue under the conditions of MB initial concentration 50mg·L-1. The adsorption mechanism was discussed based on Freundlich isotherm model and Langmuir isotherm model. It was proved that MB was easy to be adsorbed by modified coal gangue and the adsorption was belong to monolayer adsorption.The pseudo-second-order kinetic model was best accord to adsorption. And the rate of absorption was control by intra-particle diffusion.
In this paper, gold nanoparticles with branches were prepared in aqueous solutions using seed-mediated growth method. The mean diameter of the seeds chosen for these studies is 6~8nm. The influence of reducing agent used in synthesis gold sphere as seeds was investigated. A reaction mechanism of fabrication gold nanostar particles was systematically described. The nanoparticles synthesized were characterized by transmission electron microscopy (TEM) and UV-vis spectroscopy. In order to investigate their optical property, Surface Enhanced Raman Scattering (SERS) spectrums were tested, which showed quite good Raman enhencement.
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