载铝活性炭纤维电极的制备及其吸附除磷性能

发布时间：2018-06-11 17:27

本文选题：活性碳纤维 + 活性氧化铝　；参考：《硅酸盐学报》2017年07期

【摘要】：将活性炭纤维经负载活性氧化铝改性后,制备成一种可吸附除磷的电吸附材料。研究了制备材料的优化吸附条件及其吸附行为特征,探讨了电极的吸附机理。结果表明:活性氧化铝被成功负载到了电极上,电极的优化吸附条件为外加电压1 V,溶液初始pH=3,铝负载量0.3 g。加1 V电压及开路条件下,电极的吸附行为均更符合液相BET吸附模型,表明电极对磷的吸附为多层吸附过程;同时外加电压后可以显著提高初始磷浓度小于200 mg/L时的吸附量,而当初始浓度大于450 mg/L后这种提升的效果消失。电极的吸附动力学特征表现为伪一级动力学,颗粒内扩散为整个吸附的控制步骤。电极再生循环13次后仍具有初始吸附能力的40%,表明此种电极具有良好的再生性。
[Abstract]:The activated carbon fiber (ACF) was modified with activated alumina to prepare an adsorbable and phosphorous adsorptive material. The optimum adsorption conditions and adsorption behavior of the prepared materials were studied, and the adsorption mechanism of the electrodes was discussed. The results show that the activated alumina is successfully loaded on the electrode. The optimum adsorption conditions are as follows: the applied voltage is 1 V, the initial pH of the solution is 3, and the amount of aluminum loaded is 0.3 g. The adsorption behavior of the electrode under the condition of 1 V voltage and open circuit is more consistent with the liquid phase BET adsorption model, which indicates that the adsorption of phosphorus on the electrode is a multilayer adsorption process, and the adsorption capacity of the initial phosphorus concentration less than 200 mg / L can be significantly increased by the applied voltage. When the initial concentration is more than 450 mg / L, the effect of this increase disappears. The adsorption kinetics of the electrode is pseudo-first-order kinetics, and the diffusion in the particle is the control step of the adsorption. The electrode regeneration cycle is still 40% of the initial adsorption capacity after 13 cycles, which indicates that the electrode has good regeneration.
【作者单位】：重庆大学三峡库区生态环境教育部重点实验室重庆大学城市建设与环境工程学院;
【基金】：国家“水体污染控制与治理”科技重大专项(2012ZX07307-001)项目
【分类号】：O646.54;X703

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