蔗渣炭-镁铁双金属氧化物吸附剂对水中As(V)的吸附研究  

Study on Adsorption of Arsenate from Aqueous Solution by Bagasse Charcoal Mg-Fe Layered Double Oxide

作　　者：张涛[1] 梁美娜[1,2] 王敦球 朱义年[1,2] 肖瑜 唐沈[1] 

机构地区：[1]桂林理工大学环境科学与工程学院 [2]广西岩溶地区水污染控制与用水安全保障协同创新中心,广西桂林541004

出　　处：《水处理技术》2018年第1期42-47,60,共7页Technology of Water Treatment

基　　金：国家自然科学基金项目(21367010;51638006);广西自然科学基金项目(2017GXNSFAA198186)

摘　　要：采用共沉淀和焙烧法制备蔗渣炭-镁铁双金属氧化物(蔗渣炭-镁铁LDO),对合成的吸附材料进行表征,研究其对吸附As(V)的影响因素。结果表明,在p H=3.0~10时,蔗渣炭-镁铁LDO吸附剂对As(V)的吸附量较高。准2级动力学模型可用于描述其对As(V)的吸附动力学过程,吸附等温线符合Langmuir等温方程,其对As(V)的最大吸附量为25.40 mg/g。蔗渣炭-镁铁LDO受共存K^+、Na^+、Ca^(2+)、Mg^(2+)离子的影响较小,共存Cl^-、NO_3^-、SO_4^(2-)、CO_3^(2-)、HPO_4^(2-)离子影响较大,其影响大小顺序为HPO_4^(2-)>CO_3^(2-)>SO_4^(2-)>Cl^->NO_3^-。材料再生循环利用4次后,对质量浓度20.0 mg/L的As(V)的吸附效率大于90%。The bagasse charcoal/Mg-Fe layered double oxide （LDO） was prepared by co-precipitation and calcination method. Then the synthetic adsorbent was characterized and the effect of influence factors on As（V） adsorption was studied. The results showed that, when pH range was 3.0--10, bagasse charcoal/ Mg-Fe LDO had high adsorbing capacity for As（V）. The adsorption kinetics and the adsorption isotherm followed pseudo second-order model and the Langmuir model, respectively, The maximum As（V） adsorption reached 25.40 mg/g. The effect of coexisting cations （K＋, Na＋, Ca2＋, Mg2＋） were smaller compared to coexisting anions （CI, NO3-, SO42-, CO32-, I-IPO42）. The effect order was： HPO42-〉 CO32-〉 SO42-〉Cl-〉NO3-. The adsorbent was recycled and reused 4 times, the adsorption efficiency for As（V） with 20.0 mg/L mass concentration was more than 90%.

关 键 词：蔗渣炭 镁铁双金属氧化物 吸附 AS(V) 

分 类 号：TQ424[化学工程]