Mulberry SCMP pulp adsorption characteristic and action mechanism of anionic groups

doi:10.11949/j.issn.0438-1157.20160872

Abstract

Abstract:

By the experiments of anionic groups(AGs) in the mulberry SCMP adsorption of methylene blue(MB), the results of mulberry SCMP pulp of AGs in the hydrogen peroxide(H₂O₂) bleaching adsorption of methylene blue(MB) were fitted by the Langmuir isotherm equation and the Freundlich isotherm equation.It showed that the mulberry SCMP adsorption process of MB conformed to the Langmuir adsorption model.The adsorption process was monolayer adsorption and non uniform adsorption coexistence of preferential adsorption.By X-ray photo-electron spectroscopy(XPS) analysis of anionic groups in pulp and surface elements and the change of species in paper pulp.H₂O₂ bleaching can form new SAGs and improve the pulp fiber surface sulfonation degree, while reduce the lignin content in the pulp fiber and increase the contents of cellulose and hemicellulose.

Key words: anionic groups, methylene blue, absorption thermodynamics, kinetic modeling, mechanism analysis

摘要：

通过研究桑枝SCMP浆中阴离子基团（AGs）对亚甲基蓝（MB）的吸附性能实验，运用Langmuir等温方程和Freundlich等温方程对桑枝SCMP浆H₂O₂漂白中AGs对亚甲基蓝（MB）的吸附结果进行拟合，表明桑枝SCMP浆对MB的吸附过程更符合Langmuir吸附模型，得出该吸附过程是单分子层吸附与非匀质吸附共存的优惠型吸附；并采用X射线光电子能谱（XPS）分析纸浆中阴离子基团和纸浆表面元素及种类的变化情况。H₂O₂漂白会形成新的SAGs，提高纸浆纤维表面的磺化程度，同时纸浆纤维中木素含量降低，纤维素和半纤维素含量增加。

关键词: 阴离子基团, 亚甲基蓝, 吸附热力学, 动力学模型, 机理分析

CLC Number:

TS745

HU Lingyu, YAN Zhaoqing, LI Mingfu, JIN Ye, CUI Fulin, QIN Rui, LUO Lianxin. Mulberry SCMP pulp adsorption characteristic and action mechanism of anionic groups[J]. CIESC Journal, 2017, 68(1): 320-328.

胡玲玉, 闫兆晴, 李明富, 金叶, 崔富林, 覃睿, 骆莲新. 桑枝SCMP浆阴离子基团的吸附过程及吸附机理[J]. 化工学报, 2017, 68(1): 320-328.

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