【摘要】 采用盐酸改性后的钠基膨润土处理含镉(Ⅱ)废水。在静态条件下,研究了土量、温度、pH、时间对镉(Ⅱ)吸附的影响;并在动态条件下,研究了搅拌速度对镉(Ⅱ)吸附的影响。结果表明,经20%盐酸(体积分数)改性后的原膨润土对镉(Ⅱ)具有较强的吸附作用,pH是影响吸附效果的主要原因,在弱碱性(pH=7～9)条件下吸附性能大大提高。离子交换和表面络合反应是主要吸附方式,等温吸附线基本符合Langmuir吸附等温线。更多还原

【Abstract】 The Na-based bentonite under hydrochloric acid modification is used for the treatment of cadmium-containing wastewater.The influences of dosage of bentonite,temperature,pH and time on the adsorption of cadmium(Ⅱ) at static condition are studied.And the influence of agitation speed on the adsorption of cadmium(Ⅱ) at dynamic condition is also studied.The results show that the bentonite modified by hydrochloric acid with 20% (volume) has strong adsorption function.pH is the key factor of effecting the adsorption.Under weak alkaline condition(pH=7～9),the adsorption performance will be improved greatly.Ion exchange and surface complexing is the main way of adsorption.The adsorption isothermal line is basically in accordance with the Langmuir adsorption isotherm.更多还原