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首页> 外文期刊>Journal of Applied Polymer Science >Efficient removal of Congo red from pH-unregulated aqueous solutions by lignosulfonate-based polycatecholamine
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Efficient removal of Congo red from pH-unregulated aqueous solutions by lignosulfonate-based polycatecholamine

机译：从基于木质素磺酸盐的聚酰基聚氨基甲酰胺有效地从pH-未调节水溶液中去除刚果红色

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摘要

Lignosulfonate-based polycatecholamine (PCEA-LS) was synthesized by a two-stage approach involving Mannich and catechol-amine reactions, and it was directly used to adsorb Congo red (CR) from the pH-unadjusted aqueous solution. PCEA-LS was characterized using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), and X-ray photoelectron spectroscopy (XPS). Various factors affecting on removal of CR by PCEA-LS were investigated in depth, including contact time, adsorbent dosage, and initial concentration of CR and adsorption temperature. The adsorption kinetics, isotherm, and thermodynamics of PCEA-LS for CR were explored in detail, and then its adsorption mechanism was systematically elucidated. Results indicated that the removal process of CR followed the pseudo-second-order kinetic model, and the isotherm data fitted the Langmuir model well. The maximum adsorption capacity reached 972.6 mg g(-1) at 30 degrees C in the pH-unadjusted (pH = 6.25) solution possibly due to the hydrogen bond, pi-pi stacking, and electrostatic interaction between PCEA-LS and CR. (c) 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 137, 48640.
机译：通过涉及曼尼奇和儿茶酚胺反应的两阶段方法合成了基于木质素磺酸盐的聚钴酰胺（PCEA-LS），并且直接用于吸收来自pH-不调整的水溶液的刚果红色（Cr）。使用扫描电子显微镜（SEM），傅里叶变换红外光谱（FT-IR），热重分析（TGA）和X射线光电子能谱（XPS）的特征在于PCEA-LS。深入研究影响CRS的各种因素，包括接触时间，吸附剂剂量和Cr和吸附温度的接触时间，吸附剂剂量和初始浓度。详细探讨了CR PCEA-LS的吸附动力学，等温物和热力学，然后系统地阐明了其吸附机理。结果表明，CR的去除过程跟随伪二阶动力学模型，等温数据井井。由于氢键，PI-PI堆叠和PCEA-LS和Cr之间的静电相互作用，在pH-Notjusted（pH = 6.25）溶液中，最大吸附容量在30摄氏度下达到972.6mg（-1）。 （c）2019 Wiley期刊，Inc.J.Phill。聚合物。 SCI。 2019,137,48640。

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