Adsorption and Regeneration Properties of Granular Activated Carbon for Methylene Blue
In order to promote the application of granular activated carbon in the field of treatment of dye wastewater,a self-made lignin-based granular activated carbon was used for the adsorption of methylene blue(MB).The effects of initial mass concentration of MB,adsorption temperature,and solution pH on the adsorption process were investigated,and the adsorption isotherms and kinetics were used to discuss the adsorption process.Finally,the regeneration performance of activated carbon were explored.The results indicated that granular activated carbon had higher adsorption ability for MB,and the adsorption rate decreased with the decrement of solution mass concentration.The equilibrium adsorption capacity was greatly influenced by the initial adsorption concentration and adsorption temperature,but it was less affected by the pH value.The optimal adsorption temperature was 25℃.The adsorption isotherm of granular activated carbon for MB followed the Langmuir model and the adsorption process conformed to the pseudo-second-order kinetic model.The analysis of the intra particle diffusion model showed that both internal and external diffusions were the rate-limited factors for the adsorption.After adsorption and thermal regeneration at 300℃for 30 min,the MB adsorption value of the granular activated carbon reached 240 mg/g,recovering to 94.12%of the initial sample.After repeatedly adsorbed and regenerated 4 times,the MB adsorption value of the granular activated carbon remained above 85%.
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