当前位置: X-MOL 学术Chemosphere › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Application of dimensional analysis in sorption modeling of the styryl pyridinium cationic dyes on reusable iron based humic acid coated magnetic nanoparticles
Chemosphere ( IF 8.8 ) Pub Date : 2021-07-28 , DOI: 10.1016/j.chemosphere.2021.131699
Anahita Esmaeilian 1 , Kevin E O'Shea 1
Affiliation  

Cationic dyes exist in various industrial wastewaters and removal prior to discharge is necessary due to their carcinogenic behavior which poses a serious threat to human health. Iron based humic acid coated magnetic nanoparticles (HA-MNPs) were evaluated for the removal of 2-[4-(dimethylamino) styryl]-1-methylpyridinium iodide (2-ASP) as a model compound for cationic styryl pyridinium dyes from aqueous media. HA-MNPs were prepared by co-precipitation and characterized. The adsorption of 2-ASP, measured by fluorescence, demonstrates HA-MNPs are efficient for the 2-ASP removal with a maximum adsorption capacity of ~8 mg/g. Kinetic behavior and equilibrium studies showed the adsorption process fits with pseudo 2nd order and Langmuir isotherm models. The adsorption is relatively fast with ~70% of the adsorption complete within 30 min. The overall removal increases by increasing solution pH. The observed increase in adsorption can be assigned to an enhanced electrostatic attraction between the positively charged 2-ASP and the increase in the negative charge on the HA-MNPs surface as a function of increasing solution pH. Effective and repetitive regeneration of the HA-MNPs was achieved using NaOH treatment of saturated sorbent. Regeneration of HA-MNPs showed that removal efficiency remains consistently high after five consecutive cycles. Dimensional analysis suggested that initial concentration/sorbent dose ratio should be considered for accurate sorption modeling confirmed by experimental data. Then generalized empirical models for isothermal study and removal efficiency prediction were accurately deduced. This finding will help researchers in sorption studies to design their experiments more efficiently and to develop improved empirical models in removal prediction.



中文翻译:

量纲分析在苯乙烯基吡啶鎓阳离子染料对可重复使用的铁基腐植酸包覆磁性纳米粒子的吸附建模中的应用

阳离子染料存在于各种工业废水中,由于其致癌行为对人类健康构成严重威胁,因此必须在排放前去除。评估了铁基腐植酸包覆的磁性纳米粒子 (HA-MNP) 从水性介质中去除 2-[4-(二甲氨基) 苯乙烯基]-1-甲基吡啶鎓 (2-ASP) 作为阳离子苯乙烯基吡啶鎓染料的模型化合物. HA-MNPs 通过共沉淀制备和表征。通过荧光测量的 2-ASP 的吸附表明 HA-MNPs 对 2-ASP 的去除是有效的,最大吸附容量为 ~8 mg/g。动力学行为和平衡研究表明吸附过程符合伪二阶和朗缪尔等温线模型。吸附速度相对较快,约 70% 的吸附在 30 分钟内完成。总体去除率随着溶液 pH 值的增加而增加。观察到的吸附增加可以归因于带正电荷的 2-ASP 之间的静电吸引力增强和 HA-MNPs 表面负电荷的增加,作为增加溶液 pH 的函数。使用饱和吸附剂的 NaOH 处理实现了 HA-MNP 的有效和重复再生。HA-MNPs 的再生表明,在连续五个循环后,去除效率始终保持在高水平。量纲分析表明,应考虑初始浓度/吸附剂剂量比,以便通过实验数据确认准确的吸附模型。然后准确地推导出用于等温研究和去除效率预测的广义经验模型。

更新日期:2021-08-03
down
wechat
bug