【摘要】 本文提出了一种以海带为碳源,以氢氧化钾为活化剂制备新型分级多孔碳材料的简便方法.制备的氢氧化钾活化的海带质多孔碳对四环素表现出较强的吸附作用,饱和吸附量高达853.3 mg/g,显著高于其他四环素吸附剂.海带质多孔碳表现出的对四环素的高吸附量归因于其较大的比表面积(2614 m~2/g)和分级的多孔结构,以及海带质多孔碳与四环素之间存在较强的π-π相互作用.此外,制备的海带质多孔碳吸附动力学快,30 min可去除99%的四环素.同时,吸附后的海带质多孔碳可以再生重复利用,进行4次循环吸附后吸附容量没有明显降解.更重要的是,pH和离子强度几乎不影响海带质多孔碳的吸附性能,说明四环素的吸附过程不是静电作用主导的.以海带质多孔碳组装的固定床吸附柱(内含0.1 g吸附剂)在满足出水条件下,可以连续处理5.0 mg/g四环素的污染水2780 mL,具有较好的处理效果.总而言之,本文制备的海带质多孔碳对四环素吸附量容量大、吸附速率快、抗干扰能力强、可重复使用性好,使其在实际处理四环素污染的应用中具有很大的可行性.更多还原

【Abstract】 Herein we present a facile approach for the preparation of a novel hierarchically porous carbon, in which seaweeds serve as carbon source and KOH as activator. The fabricated KOH-activated seaweed carbon(KSC) displays strong affinity towards tetracycline with maximum uptake quantity of 853.3 mg/g, significantly higher than other tetracycline adsorbents. The superior adsorption capacity ascribes to large specific surface area(2614 m2/g) and hierarchically porous structure of K-SC, along with strong π-π interactions between tetracycline and KSC. In addition, the as-prepared K-SC exhibits fast adsorption kinetics, capable of removing99% of tetracycline in 30 min. Meanwhile, the exhausted K-SC can be regenerated for four cycling adsorption without an obvious degradation in capacities. More importantly, p H and ionic strengths barely affect the adsorption performance of K-SC, implying electrostatic interactions hardly play any role in tetracycline adsorption process. Furthermore, the K-SC packed fixed-bed column(0.1 g of adsorbents) can continually treat 2780 m L solution spiked with 5.0 mg/g tetracycline before reaching the breakthrough point. All in all, the fabricated K-SC equips with high adsorption capacity, fast adsorption rate, glorious anti-interference capability and good reusability, which make it hold great feasibilities for treating tetracycline contamination in real applications.更多还原