PDF(Pubmed)
Abstract：
Water pollution containing dyes become increasingly serious environmental problem with the acceleration of urbanization and industrialization process. Renewable adsorbents for cationic dye wastewater treatment are becoming an obstacle because of the difficulty of desorbing the dye from the adsorbent surface after adsorption. To overcome this dilemma, herein, we report a hydrothermal method to fabricate sulfonic acid modified yeast carbon microspheres (SA/YCM). Different characterization techniques like scanning electron microscopy, FTIR spectroscopy, and X-ray diffraction have been used to test the SA/YCM. Decorated with sulfonic acid group, the modified yeast carbon microspheres possess excellent ability of adsorbing positively charged materials. The removal rate of Methyl blue (MB) by renewable adsorbent SA/YCM can reach 85.3% when the concentration is 500 mg/L. The SA/YCM regenerated by HCl showed excellent regeneration adsorption capacity (78.1%) after five cycles of adsorption-desorption regeneration experiment. Adsorption isotherm and kinetic behaviors of SA/YCM for methylene blue dyes removal were studied and fitted to different existing models. Owing to the numerous sulfonic acid groups on the surface, the SA/YCM showed prominent reusability after regeneration under acidic conditions, which could withstand repeated adsorption-desorption cycles as well as multiple practical applications.
摘要：
随着城市化和工业化进程的加快,含染料的水体污染问题日益严重。由于吸附后染料难以从吸附剂表面解吸，用于阳离子染料废水处理的可再生吸附剂正成为障碍。为了克服这一困境，在这里，我们报道了一种制备磺酸改性酵母碳微球（SA/YCM）的水热方法。不同的表征技术，如扫描电子显微镜，FTIR光谱,和X射线衍射已用于测试SA/YCM。用磺酸基团装饰，改性酵母碳微球具有优异的吸附正电荷材料的能力。当浓度为500mg/L时，可再生吸附剂SA/YCM对甲基蓝（MB）的去除率可达85.3％。经HCl再生的SA/YCM经过5个循环的吸附-脱附再生实验显示出优异的再生吸附能力(78.1%)。研究了SA/YCM去除亚甲基蓝染料的吸附等温线和动力学行为，并适用于不同的现有模型。由于表面上有许多磺酸基团，SA/YCM在酸性条件下再生后表现出突出的可重用性，它可以承受反复的吸附-解吸循环以及多种实际应用。
