Study on equilibrium and kinetics of methylene blue adsorption of magnetic rice straw

doi:10.14088/j.cnki.issn0439-8114.2020.21.015

Abstract

Abstract: In order to provide the theoretical basis of magnetic rice straw （MRS） applied in printing and dyeing wastewater treatment, the effect of process parameters such as temperature, contact time, initial concentration of MB and the dosage of MRS on MB adsorption were discussed by static adsorption method, and the isothermal adsorption and kinetic model were also examined. Furthermore, the MRS was characterized by scanning electron microscopy （SEM）. The results showed that the adsorption rate could be up to 97.93% under following conditions： the temperature was 45 ℃, the contact time was 40 min, the initial concentration of MB was 0.05 g/L, and the dosage of MRS was 0.10 g. And the adsorption data followed Langmuir isotherm model （R²>0.94） and pseudo-second-order kinetic model （R²>0.99）. It revealed that the chemisorption nature of MRS on MB, and the adsorption process was easy to occur. SEM results showed that MRS surface had a significant change, and Fe₃O₄ was bound to the straw in the form of tiny particles. Therefore, MRS as a new type of absorbent which not only has high adsorption efficiency, but also has a good solid-liquid separation performance could be used in the treatment of printing and dyeing wastewater.

Key words: magnetic rice straw （MRS）, methylene blue, adsorption, kinetic, isothermal adsorption

CLC Number:

X712

TENG Tao, CAO Li-min, LIU Jian-hui, DAI Guang-rong. Study on equilibrium and kinetics of methylene blue adsorption of magnetic rice straw[J]. HUBEI AGRICULTURAL SCIENCES, 2020, 59(21): 75-80.

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