Adsorption of Rhodamine B in Water by Molecular Sieve Prepared from Coal Gasification Residue and Its Mechanism
The adsorption method is widely used in dye wastewater treatment due to its simple operation and high adsorption capacity.Rhodamine B(RhB)is one of the main pollutants in dye wastewater,which is highly toxic,carcinogenic and not easily biodegradable.In this study,different molecular sieves were prepared by using coal gasification slag as raw material,and the physical and chemical properties of the materials were analyzed by various characterization methods.The adsorption performance of the adsorbent on RhB was evaluated by changing factors such as initial concentration,pH value,and other factors.The adsorption process and its mechanism were explored using isotherms and kinetic models.When the temperature was 20℃,20 mg of MCM-41 was added,and the pH value was 4,the saturated adsorption amount of 171 mg/g was obtained under the condition of RhB being 120 mg/L,and it had good reusability.The adsorption process was consistent with the pseudo-second-order kinetic model and the Langmuir isotherm model,indicating that the adsorption process was dominated by chemical adsorption and was a uniform monolayer adsorption.It provides a reference for the resource utilization of coal gasification slag and the removal of RhB from wastewater,and provides an important theoretical and experimental basis for the development of efficient and stable adsorbents.
coal gasification slagmolecular sieveRhodamine Bchemical adsorptionLangmuir isotherm model
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