黄原胶水凝胶作为用于染料去除的高容量吸附剂,ACS Applied Polymer Materials

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黄原胶水凝胶作为用于染料去除的高容量吸附剂
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2021-05-17 , DOI: 10.1021/acsapm.1c00343
Dennis Gitau Njuguna ₁ , Holger Schönherr ₁

Affiliation

合成并研究了基于黄原胶的水凝胶，以尝试开发用于去除废水中染料污染物的有效吸附剂。通过首先用马来酸酐酯化黄原胶，然后通过硫醇-烯点击化学与低聚乙二醇二硫醇交联侧链乙烯基，获得水凝胶。系统地表征改性水凝胶以评估溶胀比、热性能、零电荷点和化学成分。吸附容量 ( q _max) 并使用阳离子染料龙胆紫确定水凝胶的相应吸附动力学和等温线。通过改变初始染料浓度、pH、离子强度、接触时间和吸附剂剂量来优化吸附效率。染料去除机制主要归因于聚阴离子水凝胶与阳离子染料的静电相互作用和水凝胶溶胀。单层吸附的朗缪尔模型很好地解释了等温线。在 pH 8 到 9 时，水凝胶表现出较高的理论q _max= 502 mg/g (1.23 mmol/g) 对龙胆紫。吸附和解吸动力学分别用拟二级动力学和拟一级动力学模型来最好地描述。基于黄原胶的吸附剂可以使用 0.1 M HCl 进行再生，并且可以重复使用至少 4 次，保持 99% 以上的染料去除率。

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Xanthan Gum Hydrogels as High-Capacity Adsorbents for Dye Removal

Xanthan gum-based hydrogels were synthesized and investigated in an attempt to develop efficient adsorbents for removal of dye pollutants from wastewaters. The hydrogels were obtained by first esterifying Xanthan gum with maleic anhydride and subsequent cross-linking of the pendant vinyl groups via thiol-ene click chemistry with oligoethyleneglycol dithiols. The modified hydrogels were systematically characterized to assess the swelling ratio, thermal properties, point of zero charge, and chemical composition. The adsorption capacity (q_max) and the corresponding adsorption kinetics and isotherms of the hydrogels were determined using the cationic dye Gentian Violet. The adsorption efficiency was optimized by varying the initial dye concentration, pH, ionic strength, contact time, and adsorbent dosage. The dye removal mechanism was attributed predominantly to electrostatic interactions of the polyanionic hydrogel with the cationic dye and hydrogel swelling. The Langmuir model of monolayer adsorption explained the isotherms very well. At pH 8 to 9, the hydrogel exhibited a high theoretical q_max = 502 mg/g (1.23 mmol/g) toward Gentian Violet. The kinetics of adsorption and desorption were best described with pseudo-second-order kinetics and pseudo-first-order model kinetics, respectively. The Xanthan gum-based adsorbent can be regenerated with 0.1 M HCl and reused at least 4 times maintaining over 99% dye removal.

更新日期：2021-06-11

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