Study on Adsorption Performance of Ce-Loaded Coal Gasification Slag to Congo Red

Abstract

Coal gasification slag is a solid waste that reacts with gasifier (air, oxygen or water vapor) at a certain temperature and pressure. The unburned and incompletely burned part of the coal is discharged as waste slag.Coal gasification slag itself, as a solid waste, causes dust to fly over a long period of time. At the same time, the slag contains a large amount of inorganic substances and heavy metals, which makes it impossible to recultivate the land where gasified slag has been stacked. However, it has a high porosity, which can better degrade and adsorb pollutants. This experiment uses coal gasification slag as a raw material in the coal gasification process, preparation of Ce-loaded coal gasification slag adsorbentThe adsorption performance of Congo Red by both was studied. The effects of adsorption time, pH, dosage of adsorbent and temperature on adsorption performance were also investigated.The results show that the best conditions for adsorption of raw coal gasification slag and Ce-loaded coal gasification slag are: pH=9, dosage of adsorbent is 0.5g, temperature is 50°C, reaction time is 150min, and concentration is 70mg/L. At this time, the adsorption capacity were 2.6392 mg/g and 7.152mg/g, and the removal rates were 30.65% and 95.87%, respectively. The adsorption behavior of Congo Red by raw coal gasification slag and Ce-loaded coal gasification slag is in accordance with the secondary adsorption kinetics, and conforms to the Langmuir adsorption isotherm, which is a monomolecular adsorption.