高锰酸钾改性汉麻秆芯对亚甲基蓝吸附性能的研究

doi:10.3969/j.issn.0253-2417.2018.06.011

Abstract

Abstract: The potassium permanganate modified hemp hurd powder (K-HP) was firstly prepared by oxidation with potassium permanganate. The adsorption performance of hemp hurd powder on methylene blue dye before and after modification were systematically investigated. The effects of initial concentration, adsorption time, adsorption temperature and pH value on adsorption performance were discussed. Results showed that the successful introduction of Mn-O bond into hemp hurd powder and the oxidization of hydroxyl group to the carboxyl group had no effect on the particle structure of hemp. The adsorption capacity of hemp hurd powder increased with the increment of the initial concentration of dye solution, while the dye removal rates decreased. The maximum saturation adsorption capacity for hemp before and after modification was investigated at 25℃, pH value 5 with 0.010 0 g adsorbents added into 10 mL dye solution. HP had the maximum adsorption capacity of 71 mg/g and the equilibrium adsorption time was 30 min. After modification, the maximum adsorption capacity of K-HP increased to 199 mg/g and the equilibrium adsorption time was 60 min. The adsorption performance of HP and K-HP was not affected by temperature within the range of 25-45℃ and the optimal adsorption pH value was 5. The adsorption simulation and fitting results of HP and K-HP conformed to Langmuir isothermal adsorption model, which indicated that the adsorption process was an ideal monolayer adsorption. The adsorption kinetics of methylene blue could be described by the pseudo second-order reaction model, which indicated that the adsorption rate was controlled by chemisorption.

Key words: hemp hurd powder, chemical modification, absorption, methylene blue

CLC Number:

TQ35

XU Pengbo, HE Jing, YU Juan, FAN Yimin. Methylene Blue Adsorption onto Hemp Hurd Powder Modified by Potassium Permanganate[J]. Chemistry and Industry of Forest Products, 2018, 38(6): 81-87.

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Methylene Blue Adsorption onto Hemp Hurd Powder Modified by Potassium Permanganate

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