磁性蟹壳碳吸附材料对溶液中孔雀石绿吸附性能研究

来源期刊:中南大学学报(自然科学版)2021年第5期

论文作者:唐谊平 江晨浩 王杰 龚亮 沈康 雷鸣

文章页码:1446 - 1456

关键词:磁性;蟹壳;孔雀石绿(MG);循环再生

Key words:magnetic; crab shell; malachite green; recycling

摘    要:对废弃蟹壳进行活化和碳化处理,采用共沉淀的方法将Fe3O4附载到蟹壳炭上,制备磁性蟹壳活性炭(MAC),并探究其对染料孔雀石绿(MG)的吸附性能和机理。研究结果表明:MAC去除水溶液中的MG时具有1 876.58 mg/g的最大吸附容量,实验结果与Langmuir吸附等温模型和准二级动力学模型拟合结果高度吻合。MAC的高吸附容量主要归因于活化过程创造的大量微米级孔洞以及蟹壳本身去除碳酸盐后的生物结构,提供了充足的活性位点。磁性分离回收后,MAC可以用无水乙醇脱附再生。经过5次MG吸附脱附循环,MAC保持84.6%的高吸附率。对于废弃物的二次利用和实际的废水处理而言,MAC具有高吸附效率和快速磁分离性能,是一种极具前景的生物质可回收吸附剂。

Abstract: The magnetic crab shell activated carbon(MAC) was prepared by co-precipitation method of loading Fe3O4 onto the crab shells that had been activated and carbonized. The adsorption performance and mechanism were explored by a series of experiments. The results show that MAC is used to remove MG cationic dyes in aqueous solution, which has a maximum adsorption capacity of 1 876.58 mg/g. The experimental data is highly consistent with the Langmuir adsorption isotherm model and the quasi-second-order kinetic model. The high adsorption capacity of MAC is mainly due to the large number of micro-scale pores created by the activation process and the biological structure of the crab shell itself after the removal of carbonate, which provides sufficient active sites. After magnetic separation and recovery, MAC can be desorbed and regenerated with absolute ethanol. After five cycles of MG adsorption and desorption, MAC maintains a high adsorption rate of 84.6%. This kind of biomass material with high adsorption efficiency and rapid magnetic separation is a very promising recyclable adsorbent for the secondary utilization of waste and actual wastewater treatment.

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