Study On The Adsorption And Reduction Silver Ions By Different Carrier Supporting Polyaniline

With the extensive development and application of silver and silver products, the emission of silver wastewater is more and more severe. The direct effluent of silver wastewater not only causes the environmental pollution, damages the ecological system, but also leads to the severe waste of valuable resources. At present, the study about using polyaniline and it’s composites to dispose silver wastewater has been reported, but the study about using polyaniline load on loofah and bamboo fiber to deal with silver solution has not been reported yet. This article is about using polyaniline load on natural loofah sponge and bamboo fiber respectively to produce binary compound to dispose the silver contained in silver wastewater. Firstly, the effects of different preparation conditions and adsorption and reduction of Ag+ adsorption and reduction on the complexes were studied. Secondly, the structure and appearance of the product were characterized by the infrared and scanning electron microscope. Lastly, the kinetics of adsorption process, adsorption isothermal model and the thermodynamic parameters were discussesd.The following are the major contents in the thesis:(1) In the experiment, according to the proportion CAn:CH:CAPS=1:1:1, fixes the quality of loofah sponge is 2 g and bamboo fiber is 2 g, monomer amount of An is 2 ml, polyaniline is well loaded on loofah and bamboo fiber. The loofah/ polyaniline composites and the bamboo fiber/polyaniline composites has good adsorption reduction for low concentration of Ag+ and the crystalline silver was get. The best adsorption and reduction rate to the concentration of Ag+ solution of 0.1 mmol·L-1 is about 99.17% and 97.86%, respectively. When the condition is neutral, these two compounds’ diaposal efficiency on Ag+ is the best. The condition of higher temperature and shocking is conducive to the removal of Ag+.(2) Verified by loofah/polyaniline composites and bamboo fiber/polyaniline composites adsorption revivification on Ag+, the finding of these two kinds of compound adsorption reduction on Ag+ process all meet the quasi secondary dynamics model and the Langmuir isotherm model. The thermodynamic calculation results show that, these reactionare spontaneous endothermic reaction. The higher the temperature, the stronger the adsorption revivification effect.The activation energy Ea is respectively 15.7969 kJ·mol-1 and 28.1192 kJ·mol-1, which suggests that the reaction is easy to occur and the adsorption process is physical adsorption.