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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 sorption characteristics of sulfonated lignite on the adsorption of heavy metal molybdenum (MoO_4 ~ (2-)) in wastewater, the effects of p H, time, temperature, dosage and competitive ions on adsorption were investigated experimentally, and the thermodynamics and kinetics The removal rate of MoO_4 ~ (2-) is more than 90% when p H <3, adsorption time> 30 min, dosage of 1 g, 25 ℃ ~ 30 ℃. The competitive adsorption of MoO_4 ~ (2-) reduced the removal rate from 90% to 60%, while SiO_4 ~ (4) had no significant effect on the removal of MoO_4 ~ (2-) The adsorption of MoO_4 ~ (2-) has a synergistic effect.The adsorption is more in line with the Langmuir isothermal adsorption model, the equilibrium adsorption capacity is 1.075mg / g, and the adsorption kinetics follows the quasi-second order kinetic model.The results show that the adsorption mechanism is based on the chemical Adsorption, supplemented by physical adsorption, sulfonated lignite can be applied to the depth of molybdenum wastewater treatment process.