【摘要】 染料废水的过量排放给人类健康和环境带来了严重危害。本文基于β-CD的两亲性和纳米Fe₃O₄的强磁性,制备了磁性吸附剂Fe₃O₄@CD应用于染料废水中碱性品红的高效去除。考察了染料初始浓度、吸附剂用量、温度、pH等系列因素对去除效果的影响及其吸附机理。研究表明,在室温、中性pH值下,当染料初始浓度为25 mg/L、吸附剂用量为100 mg时,所制备的Fe₃O₄@CD对BF的吸附去除效果最佳;其吸附行为符合准二级动力学和Langmuir吸附等温模型,且为自发吸热过程。Fe₃O₄@CD吸附BF后在外加磁场下可快速分离再生,循环使用5次后碱性品红染料去除率保持在75%以上。研究成果有望提供经济环保的实际染料废水处理新技术。更多还原

【Abstract】 Excessive discharge of dye wastewater has brought serious harm to human health and the environment. In this paper, a magnetic absorbent, ferroferric oxide@β-cyclodextrin（Fe₃O₄@CD）, was prepared for the efficient adsorption removal of basic fuchsin（BF） from dye wastewater, based on the special amphiphilicity of β-CD and the strong magnetism of Fe₃O₄. A series of influence factors including the initial dye concentration, adsorbent dosage, temperature and p H were investigated, as well as the adsorption mechanism. The results show that Fe₃O₄@CD has the best adsorption and removal effect on BF dye at room temperature and neutral pH, when the initial concentration of dye is 25 mg/L and the adsorbent dosage is 100 mg. The adsorption behavior conforms to the pseudo-second-order kinetics and the Langmuir adsorption isotherm, and the adsorption process is spontaneously endothermic. Fe₃O₄@CD adsorbed with BF dye can be rapidly separated under an external magnetic field and then easily regenerated by HCl treatment. After 5 times of recycling, the removal rate of the prepared magnetic composite on BF dye is kept above 75%. This work will provide an economic and eco-friendly technology for the treatment of the actual dye wastewater.更多还原