载铝活性炭纤维电极的制备及其吸附除磷性能  

Preparation of Aluminum Supported Activated Carbon Fiber Electrode for Adsorption of Phosphorus

作　　者：方俊华[1] 张伟[1] 张凯[1] 蒋荣廷 王中源 

机构地区：[1]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,重庆400045

出　　处：《硅酸盐学报》2017年第7期1000-1009,共10页Journal of The Chinese Ceramic Society

基　　金：国家"水体污染控制与治理"科技重大专项(2012ZX07307-001)项目

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。The activated carbon fibers loaded with activated alumina were prepared as a special electrode material adsorbing phosphorus. The optimized adsorption condition, adsorption kinetics and mechanism of the electrode material were investigated. The results show that the activated alumina can be loaded onto the electrode, and the optimum adsorption condition of electrode is the voltage of 1 V, the initial pH value of solution of 3, and the loading amount of activated alumina of 0.3 g. The adsorption behavior of the electrode under the condition of 1 V voltage and open circuit follows the BET adsorption model, indicating that the adsorption of phosphorus on the electrode is a multilayer adsorption process. The adsorption capacity increases when the initial phosphorus concentration is less than 200 mg/L and the initial concentration is greater than 450 mg/L, and the effect of increasing adsorption capacity disappears. The adsorption kinetics of the electrode follows the pseudo-first-order kinetic model, and the interior particle diffusion is a key step of adsorption process. The electrode has a good regeneration capacity because the electrode still has 40 percents of the initial adsorption capacity after thirteen-time regeneration.

关 键 词：活性碳纤维 活性氧化铝 电吸附 磷 

分 类 号：X703[环境科学与工程—环境工程]