| dc.description.abstract | The focus of this thesis is divided into two parts. The first part is the use of nanocasting synthesis ordered mesoporous carbons with nitrogen-doped (N-OMCs). First, nonionic surfactants (P123) were used as organic templates, and tetraethoxysilane (TEOS) were homogeneously mixed in acidic aqueous solution. Low molecular weight alcohols were added as microcells modifier. KIT-6 with cube Ia3d arrangement was synthesized by multi-component cooperative assembly. Then, the KIT-6 nanoscale porous were used as the hard-template, and filled with a nitrogen-containing carbon precursor (Resorcinol and Melamine). The precursor was treated with 900 °C carbonization to form carbon material, and finally remove the hard template of silicon oxide.
The N-OMCs was successfully synthesized, characterized and employed as adsorbents for dye removal. The equilibrium adsorption capacities were estimated to quantitatively assess the adsorption capacities of the adsorbents using Methylen Blue (MB) and Victoria Blue B (VB-B) etc. as the model dyes respectively. The plots obtained from the Langmuir and Freundlich isotherm models for adsorption of MB and VB-B etc. by the present adsorbents, and the correlation coefficients (R2) deduced from the experimental data by these two isotherm models. According to the value of R2, the Langmuir isotherm model gives a much better fit to the adsorption data than the Freundlich isotherm model. The fitting results suggest that the dye adsorption behavior for MB and VB-B etc., on the N-OMCs surface involves a monolayer adsorption process.
On the other hand, this study will also used N-OMCs for further application. The metal oxide of SnO2 nanoparticles were successfully supported on N-OMCs (denoted SnO2@N-OMCs) via wet impregnation, and the diameter size were around 4~5 nm. Sn2+ metal ions were adsorbed by N-OMCs as carriers and then calcined by high temperature (300 °C) calcination to form the SnO2 metal oxide. These materials will be used as a anode of the Lithium ion battery.
The second part is the development of new composite solid polymer electrolyte. The composite solid polymer electrolytes (SPEs) with comb structure (denoted PEDx, x=6, 9, 20) were successfully synthesized, and characterized. The polymers of the three-block structure Jeffamine ED2003, ED900 and ED600 were used to react with CN triple bond of polyacrylonitrile (PAN) as the main segment to form the composite SPEs with comb structure. The conductivity of the SPEs were the series of ED900 with an optimum ionic conductivity of 6.28 x 10-5 S/cm at 30 °C and electrochemical stability at 3.5~4.0 V for oxidative cracking Voltage. The high ionic conductivity of SPEs will be used in lithium ion batteries charge and discharge test. | en_US |