石墨烯基膜电容电吸附脱盐试验研究

Experimental Research on Desalination of Graphene-based Membrane Capacitive Deionization

以石墨烯基膜电容电吸附对质量浓度2000,3000,4000 mg/L模拟苦咸水进行了脱盐试验研究,测试了进水流量、通电电压等操作条件对其脱盐性能的影响,在相同条件下与反渗透对质量浓度2000 mg/L苦咸水的脱盐情况进行了对比。结果表明:石墨烯基膜电容电吸附对3种浓度苦咸水的脱盐率均先在极短时间内升至最大,达到95%以上,然后再缓慢减小。当进水流量相同时,在一定范围内,电压越高,脱盐率越高,运行能耗越大,但随着苦咸水浓度的提升,电压对脱盐率的影响逐渐减弱,当电压恒定时,在一定范围内,进水流量越小,脱盐率越高,运行能耗越大。反渗透对质量浓度为2000 mg/L的苦咸水的脱盐率先在短时间内迅速升至最大,达到99.57%,后维持稳定,反渗透在脱盐率方面优于石墨烯基膜电容电吸附,但在能耗方面稍占劣势。

The desalination experiment of 2000,3000 and 4000 mg/L simulated bracken water was carried out by grapheme-based membrane capacitive deionization.The influence of inlet water flow and current voltage on the desalination performance of bracken water was tested.The desalination of 2000 mg/L bracken water by reverse osmosis under the same conditions was compared.The results showed that the desalination rate of brackish water with graphene-based membrane capacitive deionization to all three concentrations increased to the maximum in a very short time,reaching above 95%,and then decreased slowly.When the inlet water flow is the same,in a certain range,the higher the voltage,the higher the desalination rate and the greater the operation energy consumption.However,with the increase of brackish water concentration,the influence of the voltage on the desalination rate gradually weakens.When the voltage is constant,the smaller the inlet water flow,the higher the desalination rate and the greater the operation energy consumption.The desalination of 2000 mg/L bracken water by reverse osmosis first rose to the maximum in a short time,reaching 99.57%,and the desalination rate remained stable.The desalination rate of reverse osmosis was better than that of grapheme-based membrane capacitive deionization,but it was slightly less favorable in terms of energy consumption.