海藻酸钠表面功能化磁性生物炭对亚甲基蓝的吸附特性
收稿日期: 2023-03-30
网络出版日期: 2024-02-06
基金资助
广西自然科学青年科学基金项目(2022GXNSFBA035617);广西糖资源工程技术研究中心项目(桂科AD16450040)
Adsorption properties of methylene blue by surface functionalized magnetic biochar with sodium alginate
Received date: 2023-03-30
Online published: 2024-02-06
利用海藻酸钠（SA）表面改性磁性生物炭（SBC），制备海藻酸钠改性磁性炭（Fe3O4@SBC-SA）以提高对亚甲基蓝（MB）的吸附能力。对吸附剂的表观形貌和结构进行表征，并结合动力学、等温线和热力学研究探讨Fe3O4@SBC-SA对亚甲基蓝的吸附特性。结果表明：Fe3O4和SA成功负载到SBC；改性后的Fe3O4@SBC-SA对亚甲基蓝的吸附能力高于SBC；Fe3O4@SBC-SA对亚甲基蓝的最佳吸附pH为7.0，在120 min时达到吸附平衡。对实验结果进行模型拟合分析得出，Fe3O4@SBC-SA对亚甲基蓝的吸附过程更符合Langmuir模型和准二级吸附动力学方程，吸附过程主要为单分子层吸附和化学吸附，饱和吸附量达到172.41 mg/g。Fe3O4@SBC-SA对亚甲基蓝的吸附机理主要是通过羧基与亚甲基蓝之间的静电引力将亚甲基蓝吸附到Fe3O4@SBC-SA上。该研究对Fe3O4@SBC-SA吸附处理废水中亚甲基蓝具有一定的实际意义。
柳富杰 , 何倩 , 苏龙 , 蒋才云 . 海藻酸钠表面功能化磁性生物炭对亚甲基蓝的吸附特性[J]. 无机盐工业, 2024 , 56(2) : 65 -73 . DOI: 10.19964/j.issn.1006-4990.2023-0180
Sodium alginate-modified magnetic biochar（Fe3O4@SBC-SA） was prepared from sodium alginate（SA） surface modified magnetic biochar（SBC） to improve the adsorption capacity of biochar for methylene blue（MB）.The apparent morphology and groups of the adsorbents were characterized，and the kinetic，isotherm and thermodynamic studies were used to discuss the adsorption characteristics of methylene blue via Fe3O4@SBC-SA.The experimental results showed that Fe3O4 and SA were successfully loaded onto SBC via the modification process，the MB adsorption property of Fe3O4@SBC-SA was better than SBC，the optimum adsorption pH was 7.0，and the adsorption equilibrium was reached at 120 min.The model fitting analysis of the experimental results showed that the adsorption process of methylene blue by Fe3O4@SBC-SA was more consistent with the Langmuir model and the quasi-second-order adsorption kinetic equations.The adsorption process was mainly monolayer adsorption and chemical adsorption，and the saturated adsorption capacity reached 172.41 mg/g.Fe3O4@SBC-SA adsorption mechanism of methylene blue was mainly through the electrostatic attraction between the carboxyl group and methylene blue.This study had certain practical significance for Fe3O4@SBC-SA adsorption treatment of methylene blue in wastewater.
Key words： methylene blue; sodium alginate; bagasse carbon; adsorbent
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