Study the Adsorption of Mold/Bentonite Composite Adsorbent on Acid Purplish Red in Wastewater
This study intends to explore the application of treating Acid Purplish Red dyeing wastewater with an inexpensive adsorbent compounded with Mold/Bentonite. It discussed the adsorption conditions and mechanism of Acid Purplish Red through single factor experiments (including dosage, initial concentration, and pH, stirring time and standing time). It also studied the adsorption kinetics and adsorption thermodynamics of this system. The results showed that the removing rate was above 94%, when the dosage of composite absorbent was 10 g/L, pH was nature (5.8), stirring time was 20min and standing time was 1h.The Acid Purplish Red system accorded with Langmuir and Freundlich absorption model, and it fitted Langmuir thermostatic adsorption equation better. And the saturated adsorption capacity can be obtained as 17.63mg/g. The sorption parameters showed that the adsorption of composite absorbent on Acid Purplish Red was easy, the system was monolayer adsorption. While the adsorption kinetic of Acid Purplish Red system fitted second-order kinetics with 78.15mg/g saturated adsorption capacity of Acid Purplish Red, and the adsorption was chemic-sorption.