以壳聚糖为前驱体,采用溶胶-凝胶法和水热碳化法制备了多孔结构的壳聚糖基碳球吸附剂,用于吸附废水中的甲基橙(MO)。通过傅里叶变换红外光谱仪、X射线衍射仪和扫描电子显微镜对吸附剂的形貌、晶体结构和化学组分进行表征,研究了溶液pH、MO初始质量浓度、吸附时间和吸附温度对碳球吸附剂吸附性能的影响。结果表明:吸附温度为30℃时,碳球吸附剂的最大吸附量为1227.38mg/g;吸附过程符合准二级动力学模型和Langmuir等温吸附模型。X射线光电子能谱分析表明氢键作用、π-π相互作用和静电作用是吸附的主要机理。
The chitosan-based carbon bead adsorbent with porous structure was prepared by sol-gel method and hydrothermal carbonization method using chitosan as precursor,targeting the adsorption of methyl orange (MO) from wastewater.The morphology,crystal structure and chemical components of the adsorbent were characterized by Fourier transform infrared spectroscopy,X-ray diffraction analysis and scanning electron microscopy.The effects of solution pH,initial mass concentration of MO,adsorption time and adsorption temperature on the adsorption performance of carbon bead adsorbent were investigated.The result suggested that the maximum adsorption capacity of the carbon bead adsorbent was 1227.38mg/g at an adsorption temperature of 30℃.The adsorption process followed the pseudo-second-order kinetic model and the Langmuir isothermal model.The X-ray photoelectron spectroscopy analysis revealed that hydrogen bonding,π-π interactions,and electrostatic interactions were the main adsorption mechanisms.
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基金资助
国家自然科学基金(22178242,51703152);山西省自然科学基金资助项目(20210302124101,202203021221093)
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