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Renewable adsorbents from carboxylate-modified agro-forestry residues for efficient removal of methylene blue dye
Journal of Physics and Chemistry of Solids ( IF 4 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.jpcs.2020.109811
Yufang Tang , Tianpei Lin , Chengjun Jiang , Yuemei Zhao , Shijie Ai

Abstract In this work, three renewable highly effective adsorbents (M-CS, M-CCL, M-CCSD) were prepared from agro-forestry residues (corn stalks (CS), Cinnamomum camphora leave (CCL) and Cinnamomum camphora saw dust (CCSD)) by eco-friendly solvent-free esterification with maleic anhydride (MA) for adsorptive removal of methylene blue (MB). The three carboxyl-rich adsorbents adsorbed MB rapidly and presented remarkable adsorption performance towards MB. The maximum adsorption capacity reached 870, 741, 787 mg/g respectively according to Langmuir isotherm model. The pseudo-second-order kinetics and Langmuir isotherm models were more suitable to descript the adsorption processes of MB on M-CS, M-CCL, M-CCSD. Moreover, electrostatic attraction and ion exchange could be involved in adsorption of MB on M-CS, M-CCL, M-CCSD. The adsorption capacity of M-CS, M-CCL, M-CCSD decreased about 4%, 4%, 3% respectively after 4 desorption-resorption cycles. Therefore, M-CS, M-CCL, M-CCSD can be used as sustainable and promising adsorbents with good reusability for highly effective removal of MB in effluent.

中文翻译:

来自羧酸盐改性的农林残留物的可再生吸附剂,可有效去除亚甲蓝染料

摘要 在这项工作中,从农林残留物(玉米秸秆(CS)、香樟叶(CCL)和香樟木屑(CCSD))制备了三种可再生的高效吸附剂(M-CS、M-CCL、M-CCSD)。 )) 通过与马来酸酐 (MA) 进行生态友好的无溶剂酯化,以吸附去除亚甲基蓝 (MB)。三种富含羧基的吸附剂快速吸附 MB 并对 MB 表现出显着的吸附性能。根据Langmuir等温线模型,最大吸附容量分别达到870、741、787 mg/g。拟二级动力学和Langmuir等温线模型更适合描述MB在M-CS、M-CCL、M-CCSD上的吸附过程。此外,静电引力和离子交换可能涉及 MB 在 M-CS、M-CCL、M-CCSD 上的吸附。M-CS的吸附能力,M-CCL、M-CCSD在4个解吸-再吸收循环后分别下降约4%、4%、3%。因此,M-CS、M-CCL、M-CCSD 可作为可持续且有前景的吸附剂,具有良好的可重复使用性,可高效去除废水中的 MB。
更新日期:2021-02-01
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