摘要
为揭示磺化褐煤对废水中重金属钼(MoO_4^(2-))的吸附特性,实验模拟考察了p H、时间、温度、投加量以及竞争离子对吸附的影响,并探讨了热力学和动力学机理.当p H<3、吸附时间>30 min、投加量为1 g、25℃~30℃时,MoO_4^(2-)的去除率达90%以上.PO_4^(3-)对MoO_4^(2-)的竞争吸附使去除率从90%以上降至60%左右,而SiO_4^(4-)对MoO_4^(2-)的去除率无明显影响,SO_4^(2-)对MoO_4^(2-)的吸附有协同效应.吸附更符合Langmuir等温吸附模型,平衡吸附量达1.075mg/g,吸附动力学符合准二级动力学模型.研究结论表明,该吸附机理是以化学吸附为主,物理吸附为辅,磺化褐煤可以应用于含钼废水的深度处理工艺.
In order to reveal the adsorption properties of sulphonated brown coal for MoO4^2- in wastewater, the influence on adsorption process by the p H, adsorption time, temperature, dosing quantity and competitive anions were investigated with experimental simulation. The adsorption mechanism was researched with the adsorption isotherm, kinetic model. The results showed that the removal efficiency of molybdenum from solution attached 90% at least, with p H3, 30 min, 1 g, and 25℃-30℃. Phosphate appeared to compete strongly with MoO_4^（2-） and the removal efficiency of molybdenum decreased from over 90% to 60% or so. Silicate did a negligible effect on the sorption of MoO4^2-. The sulfate did well to the sorption of MoO4^2-. The Langmuir isotherm adsorption model and the pseudo second-order rate equation could fit the experimental data well. The equilibrium adsorption capacity is 1.075 mg/g at the optimum conditions. The conclusion indicated that the mechanism of adsorption molybdenum onto SBC is mainly chemical adsorption and secondly physical adsorption. The SBC can be used to treat the waste water contained MoO4^2- in deep processing technology.
出处
《辽宁工程技术大学学报（自然科学版）》
CAS
北大核心
2016年第7期770-775,共6页
Journal of Liaoning Technical University (Natural Science)
基金
辽宁省教育厅项目(L2013249)
辽宁工业大学校基金项目(X201209)
国家水专项项目(2012ZX07202-003)
关键词
重金属污染
吸附
磺化褐煤
钼
等温线
准二级动力学
heavy metal pollution
adsorption
sulfonated brown coal（SBC）
molybdenum
isothermal line
pseudo second-order rate equation
