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首页> 外文期刊>RSC Advances >Novel tunable composites based on bentonite and modified tragacanth gum for removal of acid dyes from aqueous solutions
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Novel tunable composites based on bentonite and modified tragacanth gum for removal of acid dyes from aqueous solutions

机译：基于膨润土和改性黄aga胶的新型可调谐复合材料，用于从水溶液中去除酸性染料

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A series of new adsorbents derived from tragacanth gum-graft-poly(methyl methacrylate) and bentonite (TG-g-PMMA/B) were synthesized. The developed composites were evaluated by removal of congo red (CR), methyl orange (MO), and acid blue 113 (AB-113) as model anionic azo dyes from aqueous solutions followed by UV-Vis spectrophotometric determination. It was revealed that the simultaneous introduction of inorganic bentonite clay into the TG-g-PMMA polymer matrix drastically improved capability of the adsorbent and surface morphology of the composites in comparison with TG, and TG graft copolymer and led to better dispersion in the polymeric matrix without agglomeration. Furthermore, the chemical structures of the adsorbate molecules affect the specific interactions of the adsorbents with adsorbates. The adsorbents were characterized by using FTIR, SEM, and TG/DTA analysis. The effect of various factors influence the dye adsorption including the adsorbent dose, sample pH, contact time, and dye concentration were investigated and optimized by response surface methodology (RSM) using central composite design. Under the optimum conditions, maximum adsorption of the CR, MO, and AB-113 dyes were observed at pH 8.5 with adsorbent dose of 5 mg mL(-1), 30 mg mL(-1), and 75 mg mL(-1), respectively. The dye adsorption process was controlled by pseudo-second order and intraparticle diffusion kinetic models. The adsorption equilibrium data of the studied dyes well fitted with Langmuir isotherm with maximum adsorption capacity of 900, 750, and 8.5 mg g(-1) for CR, MO, and AB-113, respectively.
机译：合成了一系列来自黄aga胶接枝聚甲基丙烯酸甲酯和膨润土（TG-g-PMMA / B）的新型吸附剂。通过从水溶液中除去作为模型阴离子偶氮染料的刚果红（CR），甲基橙（MO）和酸性蓝113（AB-113），然后通过UV-Vis分光光度法测定，对开发的复合材料进行了评估。结果表明，与TG和TG接枝共聚物相比，将无机膨润土粘土同时引入TG-g-PMMA聚合物基体极大地提高了复合材料的吸附能力和表面形态，并导致在聚合物基体中的分散性更好。没有结块。此外，被吸附物分子的化学结构影响吸附剂与被吸附物的特定相互作用。通过FTIR，SEM和TG / DTA分析对吸附剂进行表征。使用中央复合设计，通过响应表面方法（RSM）研究和优化了各种因素对染料吸附的影响，包括吸附剂量，样品pH，接触时间和染料浓度。在最佳条件下，在pH值为8.5的条件下，分别以5 mg mL（-1），30 mg mL（-1）和75 mg mL（-1）的吸附剂观察到CR，MO和AB-113染料的最大吸附量。 ）， 分别。染料的吸附过程由伪二级和粒子内扩散动力学模型控制。完全符合Langmuir等温线的研究染料的吸附平衡数据，其最大吸附量分别为900、750和8.5 mg g（-1），分别对CR，MO和AB-113。

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