Department of Chemical Engineering, Sathyabama Institute of Science and Technology, Chennai, India.
Department of Chemical Engineering, Sri Sivasubramaniya Nadar College of Engineering, Chennai, 603 110, India.
Chemosphere. 2021 Jun;273:129634. doi: 10.1016/j.chemosphere.2021.129634. Epub 2021 Jan 15.
A comparison study of an electrolytic, adsorption, and a novel hybrid method towards the removal of malachite green (MGD) dye from the aquatic environment utilizing agricultural biomass, Eucalyptus globulus seeds was examined. The synthesized material has been characterized by thermogravimetric analysis, SEM, FTIR, and XRD. The acid-modified biosorbent developed a microporous structure suggesting a suitable removal process of MDG. The hybrid method was carried in an indigenously designed three-phase three-dimensional electrolytic reactor with varying applied voltage (6, 9, and 12 V) with biosorbent serving as particle electrode. The hybrid method gave the highest removal rate at a voltage of 12 V, compared to other methods. Moreover, the dye removal capacity increased with increased voltage, and contact time was optimized at 15 min. The adsorption isotherm was well fitted with Freundlich isotherm and kinetic data represented pseudo-second-order. Intra particle diffusion studies suggested no interference with gradual adsorption from macropores to micropores. The removal efficiency of particles electrodes for 6, 9, and 12 V were 95, 97, and 99.8%, respectively. The higher removal of MDG towards the hybrid system may be assigned to the synergistic effect of electrolytic and adsorption systems. Regeneration studies indicated that the biosorbent can be reused up to ten times without appreciable loss of efficiency.
采用热重分析、SEM、FTIR 和 XRD 对利用农业生物质桉树种子制备的一种新型混合方法进行了研究，该方法是对电吸附和电化学反应去除水环境污染中孔雀石绿（MGD）染料的比较研究。合成材料具有微孔结构，表明其对 MDG 具有合适的去除过程。在具有生物吸附剂作为颗粒电极的自制三相三维电解反应器中进行了混合方法，施加的电压分别为 6、9 和 12V。与其他方法相比，混合方法在 12V 电压下具有最高的去除率。此外，染料去除容量随电压增加而增加，并将接触时间优化在 15 分钟。吸附等温线与 Freundlich 等温线拟合良好，动力学数据表示准二级。内扩散研究表明，没有从大孔到微孔的逐渐吸附干扰。6、9 和 12V 下颗粒电极的去除效率分别为 95%、97%和 99.8%。混合体系对 MDG 的更高去除率可能归因于电解和吸附系统的协同效应。再生研究表明，生物吸附剂可以重复使用十次而不会明显降低效率。
