离子液体负载沸石吸附除砷及其影响因素..doc

离子液体负载沸石的吸附除砷及其影响因素 彭长宏, 朱云, 余芳 中南大学 冶金科学与工程学院，长沙，410083摘 要：研究对溶液中As()和As(V)的去除性能。结果表明，对As()和As(V)具有较强的吸附能力，关键词：离子液体；；吸附；除砷647.3 文献标志码：A Removal of arsenic and its influencing factors by zeolite adsorbents loaded with ionic liquid PENG Chang-hong, ZHU Yun, YU Fang (School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China) Abstract: The removal performance and its influencing factors on arsenic by zeolite adsorbents loaded with ionic liquid (referred to as CR-Z and BU-Z) were studied using the static method and the dynamic method. The results showed that CR-Z and BU-Z has a strong adsorption capacities for As(III) and As(V) and the adsorption capacity of As(V) was higher than that of As(III). CR-Z and BU-Z has fast absorption kinetics for arsenic and their adsorption performances are in accordance with the second-order kinetics equation. The adsorption thermodynamics for arsenic by CR-Z and BU-Z could be characterized with Langmuir equation and the Freundlich equation. The breakthrough adsorption capacities of CR-Z and BU-Z for As(V) were 17.98mg/g and 9.995 mg/g. The dynamic equilibrium adsorption capacities of CR-Z and BU-Z for As(V were 34.22mg/g and 25.83 mg/g. The arsenic removal capacities of CR-Z and BU-Z were obviously influenced by pH value of solution and optimal pH ranges for As(III) and As(V) removal were around pH 6.3 for CR-Z and BU-Z adsorbents. The adsorption capacities on As(V) of reused CR-Z and Z show the first decline after stable trend. The adsorption capacity of CR-Z on arsenic is larger than that of Z on arsenic adsorption capacity. Key words: ionic liquid; zeolite; adsorption; removal of arsenic 重金属砷常与铅、锌、锑和铜等有色金属硫化矿伴生，随采矿、选矿和冶炼等过程砷转移到环境中[1]。与其它方法相比，吸附法简单易行、处理量大、经济适用、耐环境冲击等优点可用的吸附剂有活性铝、活性炭、赤铁矿与二氧化钛等(III)的吸附效果差，需添加氧化剂将As(III)氧化为As(V)，提高了含砷废水的处理成本。 离子液体[]作为一种新型萃取剂，具有环境友好性和可设计性，被用来替代常规的有机萃取剂作为离子分离的介质成为当前研究的热点。比如：Yasuhiro[19]设计合成3种具有离子识别功能的离子液体，Viss