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首页> 外文期刊>RSC Advances >Removal of cationic and anionic dyes from aqueous solution with magnetite/pectin and magnetite/silica/pectin hybrid nanocomposites: kinetic, isotherm and mechanism analysis
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Removal of cationic and anionic dyes from aqueous solution with magnetite/pectin and magnetite/silica/pectin hybrid nanocomposites: kinetic, isotherm and mechanism analysis

机译：用磁铁矿/果胶和磁铁矿/二氧化硅/果胶/果胶杂交纳米复合材料去除阳离子和阴离子染料中的阳离子和阴离子染料：动力学，等温线和机制分析

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Novel adsorbents, magnetite nanoparticles modified with pectin shell and silica/pectin double shell, were fabricated and tested for single dye and dye mixture adsorption from water samples. Cationic dyes methylene blue (MB) and crystal violet (CV) and anionic dyes methyl orange (MO) and Eriochrome black T (EBT) were employed to assess dye removal efficiency. The influence of pH, amount of adsorbent, initial dye concentration and contact time was investigated. Results indicated that the optimum pH for removing cationic dyes was 8.0 and 2.0 for anionic dyes. The kinetic studies showed rapid sorption dynamics following a second-order kinetic model. Dye adsorption equilibrium data were fitted well to the Sips isotherm for cationic and anionic dyes. The maximum monolayer capacity, ( q _(max) ) for MB, CV, EBT and MO was calculated from Sips as 197.18, 180.29, 65.35 and 26.75 mg g ~(?1) respectively for magnetite/silica/pectin NPs and 168.72, 140.49, 72.35 and 27.22 mg g ~(?1) respectively for magnetite/pectin nanoparticles. For dye mixture adsorption, a new HPLC assay was proposed for quantitation of dyes in treated samples. The results came in accordance with that of single dye adsorption where the magnetite/pectin NPs showed preferred adsorption to anionic dyes while the magnetite/silica/pectin NPs had more affinity to cationic dyes. Thus, our proposed NPs can be used as cheap and efficient adsorbents for removal of cationic and anionic dyes from aqueous solutions.
机译：用果胶壳和二氧化硅/果胶双壳改性的新型吸附剂，制备并测试了从水样中吸附的单染料和染料混合物。使用阳离子染料亚甲基蓝（MB）和晶体紫（CV）和阴离子染料甲基橙（Mo）和埃里克罗姆黑T（EBT）评估染料去除效率。研究了pH，吸附剂，初始染料浓度和接触时间的影响。结果表明阴离子染料除去阳离子染料的最佳pH值为8.0和2.0。动力学研究显示了二阶动力学模型后的快速吸附动力学。染料吸附平衡数据适用于酸乳和阴离子染料的啜饮等温。 MB，CV，EBT和Mo的最大单层容量（Q _（最多））分别根据磁铁矿/二氧化硅/果胶NPS和168.72分别从啜饮为197.18,180.29,65.35和26.75mg g〜（α1）。分别用于磁铁矿/果胶纳米粒子的140.49,72.35和27.22mg g〜（α1）。对于染料混合物吸附，提出了一种新的HPLC测定，用于定量处理的样品中的染料。结果根据单染料吸附的影响，其中磁铁矿/果白NPS显示对阴离子染料的优选吸附，而磁铁矿/二氧化硅/果胶NPS对阳离子染料具有更多亲和力。因此，我们所提出的NPS可用作廉价和有效的吸附剂，用于从水溶液中去除阳离子和阴离子染料。

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