环保型pva -壳聚糖吸附膜去除偶氮染料酸橙7:物理交联、吸附过程及材料的再利用

IF 9.9 Q1 MATERIALS SCIENCE, COMPOSITES Advanced Industrial and Engineering Polymer Research Pub Date : 2023-07-01 DOI:10.1016/j.aiepr.2022.12.001
John Perez-Calderon , Diego Alejandro Marin-Silva , Noemi Zaritzky , Adriana Pinotti
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引用次数: 8

摘要

废水处理需要使用环保且经济高效的吸附剂。开发了一种基于可生物降解聚合物(聚乙烯醇(PVA)和壳聚糖(Ch)的混合吸附膜,用于去除工业废水中纺织工业中的偶氮染料酸性橙7(AO7)。聚合物吸收材料经过不同时间-温度组合的固化过程,提高了其在水性介质中的物理稳定性。调制差示扫描量热法(MDSC)和热重分析(TGA)支持了这一结果。ATR-FTIR还证实了PVA和Ch之间以及聚合物和染料之间通过氢键的静电相互作用。达到高去除率而不损失重量的最佳固化条件是160°C-1h的组合。染料的吸附主要取决于pH、吸附剂剂量、接触时间、温度和共存阴离子。在pH=2.5时达到最大去除效率(>91%)。吸附动力学遵循Lagergren拟一阶速率方程,吸附等温线最好用Redlich-Peterson模型描述。据作者所知,本工作中获得的吸附膜的最大吸附容量(Qm)是文献中报道的最高值(在298K和pH=2.5时,Qm=678mg/g)。在pH4.0时,物理吸附将是主要机制,而在pH2.5时,该过程通过化学吸附进行。再生研究表明,复合材料可以连续使用五次,而不会失去吸附能力。因此,使用开发的生态相容的可生物降解材料将允许在不丧失去除选择性的情况下容易再生,这是开发环境友好吸附材料的关键特征。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Eco-friendly PVA-chitosan adsorbent films for the removal of azo dye Acid Orange 7: Physical cross-linking, adsorption process, and reuse of the material

The treatment of wastewater requires the use of eco-friendly and cost-efficient adsorbents. A hybrid adsorbent film based on biodegradable polymers (poly(vinyl alcohol) (PVA) and chitosan (Ch) was developed to remove Acid Orange 7 (AO7), an azo dye from the textile industry present in industrial wastewaters. The polymeric absorbent material was submitted to a curing process with different time-temperature combinations which improved its physical stability in aqueous media. This result was supported by modulated differential scanning calorimetry (MDSC) and thermogravimetric analysis (TGA). ATR-FTIR also confirmed the electrostatic interactions by hydrogen bonds between PVA and Ch, as well as among the polymers and the dye. The best curing condition to reach a high removal without weight loss was the combination of 160°C-1h.

Dye adsorption depended mainly on pH, adsorbent dose, contact time, temperature, and coexisting anions. The maximum removal efficiency (>91%) was achieved at pH = 2.5. The adsorption kinetics followed the Lagergren pseudo first-order rate equation and the adsorption isotherm was best described by the Redlich-Peterson model. As far as the authors know, the maximum adsorption capacity (Qm) of the adsorbent film obtained in the present work is the highest value reported in literature (Qm = 678 mg/g at 298 K and pH = 2.5). Physisorption would be the dominant mechanism at pH 4.0 while at pH 2.5 the process was conducted by chemisorption. Regeneration studies showed that composites could be used for five consecutive cycles without losing their adsorption capacity.

Thus, the use of the developed eco-compatible biodegradable materials would allow easy regeneration without losing removal selectivity, a key feature in the development of environmentally friendly sorbent materials.

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来源期刊
Advanced Industrial and Engineering Polymer Research
Advanced Industrial and Engineering Polymer Research Materials Science-Polymers and Plastics
CiteScore
26.30
自引率
0.00%
发文量
38
审稿时长
29 days
期刊最新文献
Editorial Board Editorial Board Fire performance durability of flame retardants in polymers and coatings Review of thermal conductivity in epoxy thermosets and composites: Mechanisms, parameters, and filler influences Surface grafting POSS to improve the hydrophobicity and fire safety of polyrotaxane based smart phase change materials
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