吸附
针铁矿
朗缪尔吸附模型
水溶液
碱金属
化学
壳聚糖
核化学
刚果红
无机化学
朗缪尔
弗伦德利希方程
化学工程
扫描电子显微镜
降水
材料科学
有机化学
复合材料
工程类
物理
气象学
作者
Sudipta Chatterjee,Godfred Ohemeng‐Boahen,Divine Damertey Sewu,Barnabas Asamoah Osei,Seung Han Woo
标识
DOI:10.1016/j.jece.2022.108244
摘要
Goethite impregnated chitosan hydrogel capsules (GS5) were treated with an alkali solution and the effect of alkali treatment on the adsorption performance of the treated capsules for Congo red (CR), and the changes in physico-chemical properties, morphology, and mechanical stability of the capsules were studied. The goethite particles were synthesized via the co-precipitation method from ferric chloride hexahydrate solution and NaOH. The as-obtained goethite nanoparticles were successfully impregnated into chitosan capsules via an anionic surfactant gelation approach. The alkali treatment of GS5 with 0.02 N alkali solution (GSN5) increased adsorption capacity from 1040.54 mg/g (GS5) to 1641.96 mg/g as obtained by Langmuir adsorption isotherm. The goethite impregnated chitosan capsules more closely followed the Freundlich adsorption isotherm than the Langmuir adsorption isotherm model suggesting heterogeneous adsorption sites on the capsules, and both varieties of the capsules showed a better fit to first-order-kinetic rate model. Elemental analysis, inductively coupled plasma optical emission spectroscopy (ICP-OES), and energy dispersive X-ray (EDX) spectroscopy clearly indicated that alkali treatment completely removed SDS from the capsules and also, caused some morphological changes in the structural network of capsules as obtained by scanning electron microscopy (SEM). The mechanical stability study indicated that alkali treatment caused slightly more weight loss of the capsules under mechanical agitation.
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