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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。
After the activated carbon fiber is modified with activated alumina, an adsorptive phosphorus-removing material is prepared. The optimized adsorption conditions and adsorption behavior of the prepared materials were studied, and the adsorption mechanism of the electrode was discussed. The results showed that activated alumina was successfully loaded onto the electrode. The optimal adsorption conditions were 1 V applied voltage, initial pH of solution = 3 and aluminum loading of 0.3 g. Under 1 V voltage and open circuit conditions, the adsorption behavior of the electrode is more in line with the liquid phase BET adsorption model, indicating that the adsorption of phosphorus on the electrode is a multi-layer adsorption process; while the applied voltage can significantly increase the initial phosphorus concentration less than 200 mg / L Of the adsorption capacity, and when the initial concentration is greater than 450 mg / L, the effect of this increase disappears. The adsorption kinetic characteristics of the electrode showed pseudo-first-order kinetics, and intra-particle diffusion was the control step of the whole adsorption. Electrode regeneration cycle after 13 times still has the initial adsorption capacity of 40%, indicating that the electrode has good reproducibility.