Study on the Adsorption Characteristics of Peanut Shells Modified by Formaldehyde to Methylene Blue
YU Chun-li et al (School of Environmental and Biological Engineering,Chongqing Technology and Business University,Chongqing 400067)
[Objective] The study aimed to provide theoretical directions for applying peanut shells in disposing dyestuffs wastewater.[Method] The influences of factors such as oscillation time,inintial concn.,pH value and temperature on the adsorption process were discussed through the adsorption experiment on peanut shells modified by formaldehyde to methylene blue.[Result] In 15 min,the adsorption quantity of peanut shells modified by formaldehyde to methylene blue was increased quickly as the adsorption time extended.After 15 min,the adsorption quantity was increased slowly as the time extended.the adsorption quantity of peanut shells modified by formaldehyde to methylene blue changed less in 35-55 min,changed more in 55-75 min and basically had no change after 95 min.When the pH value was 1-3,the adsorption quantity of peanut shells modified by formaldehyde to methylene blue was reduced as the pH value was increased.When the pH value was 3-5,the adsorption quantity was minimum.When the pH value was 5-8,the adsorption quantity was increased and when the pH value was higher than 8,the adsorption quantity was reduced again.The adsorption process of peanut shells modified by formaldehyde to methylene blue accorded with Langmuir and Freundlich models and its adsorption equilibrium constant and maximum adsorption quantity were increased as the temperatrue was increased.[Conclusion] The adsorption process was spontaneous endothermic process and accorded with second kinetics reaction.
【CateGory Index】： X703