Using activated carbon electrode in electrosorptive deionisation of brackish water
Using activated carbon electrode in electrosorptive deionisation of brackish water
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DOI：
10.1016/j.desal.2007.07.014
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发表时间：
2008-05
期刊：
影响因子：
9.9
通讯作者：
L. Zou;G. Morris;D. Qi
中科院分区：
文献类型：
--
作者：
L. Zou;G. Morris;D. Qi
研究了电吸附去离子过程，以将该技术发展为脱盐系统。实验已经在反应器系统中进行，并且已经发现活性炭由于其非常高的吸附能力和导电性而具有一定的去离子能力，因此其可以用作替代电极材料。对活性炭材料进行了表面改性，包括碱处理和负载二氧化钛纳米颗粒。用比表面积和孔隙率分析仪测定了催化剂的比表面积、平均孔径和总孔容。修饰电极材料表现出增强的电吸附容量和减少的物理吸附在孔隙中，因此解吸更有效。采用超声波振动和升温的方法对饱和活性炭电极进行了脱附实验，并给出了在20°C和50°C下超声波辅助再生的结果。使用恒电位仪在不同扫描速率下进行循环伏安实验，以分析活性炭材料的双电层电容。这项初步研究表明，活性炭颗粒有潜力成为具有成本效益的电极材料，用于微咸水。电吸附效率的提高可以通过化学品和金属氧化物纳米颗粒如TiO 2的表面改性来实现。
The electrosorptive deionisation process has been investigated to develop the technology into a system for desalination. Experiments have been conducted in a reactor system and it has been found that the activated carbon has some deionisation capacity due to its very high adsorption capacity and conductivity, so it can be used as an alternative electrode material. Surface modifications have been made to the activated carbon material, including alkaline treatment and loading of titanium dioxide nanoparticles. The specific surface areas (BET), average pore size and total pore volume were analysed by surface area and porosity analyzer. The modified electrode material demonstrated enhanced electrosorption capacity and reduced physical sorption at the pores, so desorption is more efficient. An innovative approach for desorption of the saturated activated carbon electrodes has been tried using ultrasonic vibration and increased temperature, the results of regeneration in water, aided by ultrasonic at 20°C and 50°C are presented as well. Cyclic voltammetry experiments at various scan rates were conducted using a potentiostat to analyse the electrical double-layer capacitance of the activated carbon materials. This preliminary study demonstrated that activated carbon granules have the potential to be cost-effective electrode materials for desalting brackish water. The improvement of the electrosorption efficiency can be achieved by surface modification by chemicals and metal oxide nanoparticles such as TiO2.