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首页> 外文期刊>Journal of Applied Polymer Science >Adsorptive Removal of Methylene Blue from Simulated Dyeing Wastewater with Melamine-Formaldehyde-Urea Resin
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Adsorptive Removal of Methylene Blue from Simulated Dyeing Wastewater with Melamine-Formaldehyde-Urea Resin

机译：三聚氰胺-甲醛-尿素树脂对模拟印染废水中亚甲基蓝的吸附去除

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摘要

A melamine-formaldehyde-urea (MFU) resin was used as adsorbent to clean wastewater containing a basic dye (methylene blue) used to simulate leather and textile processing dyes. Dye removal was followed by measuring the initial and final dye concentration in solution by UV-Vis spectroscopy using the analytical wavelength of k _ 665 nm and the molar absorptivity of e _ (8.43 0.05) 104 L mol 1 cm 1. The concentration range of methylene blue in solution for adsorption experiments was between 10 7 and 10 5 M so as to avoid dye polymerization reactions in solution that would give rise to apparent deviations from Beer’s law. Batch and column methods were used for investigating adsorptive removal of dye. Parameters such as pH and contact time were optimized. The capacity of the sorbent for the dye was found by classical adsorption modeling (15.0 mg g 1) with the aid of a Langmuir isotherm. The optimal pH for adsorption was 7_8. Adsorption is thought to proceed mainly through cation exchange of methylene blue (MB_) with the RACOO exchange groups of the sorbent. Adsorption was fast, and reached an equilibrium within 30 min. Color removal of simulated leather dyeing wastewater was shown to be feasible under optimal conditions.
机译：使用三聚氰胺-甲醛-脲（MFU）树脂作为吸附剂，以清洁含有碱性染料（亚甲蓝）的废水，该染料用于模拟皮革和纺织品加工染料。去除染料后，使用k_665 nm的分析波长和e_（8.43 0.05）104 L mol 1 cm 1的摩尔吸收率，通过UV-Vis光谱法测量溶液中的初始和最终染料浓度。用于吸附实验的溶液中的亚甲基蓝在10 7和10 5 M之间，以避免溶液中的染料聚合反应，这会引起明显的比尔定律偏离。分批法和柱法用于研究染料的吸附去除。优化了诸如pH和接触时间之类的参数。借助于兰格缪尔等温线，通过经典的吸附模型（15.0 mg g 1）发现了染料的吸附剂容量。吸附的最佳pH为7_8。认为吸附主要通过亚甲基蓝（MB_）与吸附剂的RACOO交换基团的阳离子交换而进行。吸附很快，并在30分钟内达到平衡。结果表明，在最佳条件下模拟皮革染色废水的脱色是可行的。

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