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Removal behavior of Babool bark(Acacia niloticd)for submicro concentrations of Hg~(2+)from aqueous solutions:a radiotracer study

机译:狒狒树皮对亚微米浓度的Hg〜(2+)从水溶液中的去除行为:放射性示踪研究

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The uptake behavior of Babool bark(Acacia nilotica)for the micro to trace levels of Hg~(2+)from aqueous solutions has been carried out in batch equilibrium experiments,employing a 'radiotracer technique'.A high level of uptake of metal ions on the solid surface occurs within ca.2h of contact time.The increase of sorptive concentration(10~(-7)to 10~(-2)M),temperature(303-333 K),and pH(3-10)favored the removal process of ions.The percentage adsorption increases from 54.3 to 91.3% with an increase in dilution of sorptive solution from 10~(-2)to 10~(-7)M.First order uptake of Hg~(2+)followed the Freundlich and Dubinin-Radushkevich(D-R)isotherms for the entire range of adsorptive concentration studied.Temperature dependence data show that this process is endothermic in nature.Desorption experiments further confirm the irreversibility of the sorption process as no significant desorption took place in the bulk concentration of the adsorptive.
机译:通过“放射性示踪技术”,在间歇平衡实验中进行了狒狒皮(Acacia nilotica)对水溶液中微量Hg〜(2+)的吸收行为。接触时间约2h内固体表面发生吸附。吸附浓度(10〜(-7)至10〜(-2)M),温度(303-333 K),pH(3-10)的增加随着吸附溶液稀释度从10〜(-2)M增加到10〜(-7)M,吸附百分数从54.3%增加到91.3%.Hg〜(2+)的一级吸收在整个吸附浓度范围内,遵循Freundlich和Dubinin-Radushkevich(DR)等温线。温度依赖性数据表明该过程本质上是吸热的。解吸实验进一步证实了吸附过程的不可逆性,因为在吸附过程中未发生明显的解吸。吸附剂的体积浓度。

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