丝藻对含钼废水中MoO_4^(2-)的吸附特性及机制研究  

Performance and mechanism studies of adsorption molybdenum(MoO_4^(2-))from waste water by ulothrix

作　　者：于常武[1] 高超[1] 

机构地区：[1]辽宁工业大学化学与环境工程学院,辽宁锦州121001

出　　处：《环境污染与防治》2015年第7期55-60,共6页Environmental Pollution & Control

基　　金：辽宁省教育厅资助项目(No.L2013249)

摘　　要：研究了丝藻对含钼废水中MoO2-4的吸附作用。分别考察了初始pH、吸附时间、温度、投加量以及竞争离子等5个因素对吸附过程的影响,并应用吸附热力学和动力学方法对吸附机制进行了探讨。结果表明,丝藻在初始pH 1、吸附时间40min、投加量为1.0g以及30℃条件下,对含钼废水中MoO2-4的去除率达82%,平衡吸附量为0.657 0mg/g。PO3-4对MoO2-4的吸附具有较强的拮抗作用,平衡吸附量下降至0.380 0mg/g,SiO4-4对MoO2-4的拮抗作用相对较弱,而SO2-4对MoO2-4的吸附却有一定的协同作用。丝藻对MoO2-4的吸附等温数据更符合Langmuir吸附等温模型,准二级动力学方程拟合的吸附动力学过程相关性较高,20、25℃下的R2都在0.99以上。说明丝藻吸附MoO2-4属于化学吸附,受化学反应速率控制,且丝藻可以应用于含钼废水治理领域。The adsorption behavior of molybdenum （MOO4 2-） from waste water by ulothrix was studied by experiment. Five factors including pH, adsorption time, temperature, dosage and competitive anions were investigated. In addition,the adsorption mechanism was researched by the method of adsorption isotherm and kinetic model. The results showed that the removal efficiency of molybdenum from waste water containing low concentration molybdenum attached 82% and the Equilibrium Adsorption Quantity （EAQ） was 0.657 0 mg/g,with pH 1, adsorption time 40 min, dosage 1.0 g,and 30 ℃. PO4 3- competed strongly with MOO]- in adsorption system and the EAQ fell to 0.380 0 mg/g and SiO4 4- competed with MoO] at a relatively low level,but MoO4^2- played a synergy effect with MOO]-. The Langmuir adsorption isotherm model and the pseudo second-order rate equation could fit the experimental data very well.The correlation coefficients of 20,25 ℃ were all more than 0.99. It was concluded that adsorption molybdenum onto ulothrix was chemical adsorption and was controlled by chemical reaction rate. The conclusion showed that the ulothrix could be applied in adsorption molybdenum from waste water in practice.

关 键 词：重金属污染 吸附 丝藻 钼 

分 类 号：X703[环境科学与工程—环境工程]