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Adsorption of Cu(II),Ni(II) and Zn(II) on dye loaded groundnut shells and sawdust

机译:染料上染的花生壳和木屑对Cu(II),Ni(II)和Zn(II)的吸附

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The potential of cheap cellulose-containing natural materials like groundnut shells and sawdust was assessed for Cu(II),Ni(II) and Zn(Il) adsorption from their aqueous solutions.These materials showed good adsorption capacities,although the levels differed depending on the combination of adsorbing material and metal ion.Application of a specific dye,C.I.Reactive Orange 13 onto the material further enhanced the adsorption capacity.The maximum metal ion uptake values for Cu(II),Ni(II) and Zn(II) were 7.60,7.49 and 9.57mg/g,respectively,for the dye loaded groundnut shells as against the respective values 4.46,3.83 and 7.62 mg/g achieved when the unloaded groundnut shells was used as adsorbent.Similarly,the dye loaded sawdust gave the adsorption values 8.07 mg/g for Cu(II),9.87 mg/g for NI(II) and 17.09 mg/g for Zn(II),which were higher than the corresponding values 4.94,8.05 and 10.96 mg/g achieved with unloaded sawdust as adsorbent.With lowering of the pH of a metal ion solution,all the adsorbing materials showed a decrease in the adsorption capacities.When the pH of a metal cation solution was decreased to the lowest level at 1.5,the adsorption reached to very low values in all the cases.Even under low pH,the adsorption of metal ions on dye-loaded adsorbents was comparatively higher.This was made use of in desorption studies.Adsorption isotherm models were developed wherein the best fit was obtained in the Langmuir model.The regeneration and reusability of the adsorbents were also assessed for three successive adsorption-desorption cycles and were found to retain the adsorptive capacity.
机译:评估了廉价的含纤维素天然材料(如花生壳和锯末)对其水溶液中Cu(II),Ni(II)和Zn(Il)吸附的潜力。这些材料显示出良好的吸附能力,尽管其含量有所不同,具体取决于特定的染料CIReactive Orange 13在材料上的应用进一步增强了吸附能力。Cu(II),Ni(II)和Zn(II)的最大金属离子吸收值为负载染料的花生壳分别为7.60、7.49和9.57mg / g,而使用未负载的花生壳作为吸附剂时分别达到4.46、3.83和7.62 mg / g。同样,负载染料的木屑也具有吸附作用。铜(II)的值为8.07 mg / g,镍(II)的值为9.87 mg / g,锌(II)的值为17.09 mg / g,分别高于未装载的木屑时的相应值4.94、8.05和10.96 mg / g随着金属离子溶液pH值的降低,所有吸附材料的吸附能力下降。当金属阳离子溶液的pH降至1.5的最低水平时,在所有情况下吸附均达到非常低的值。即使在低pH值下,金属离子也被吸附。染料负载的吸附剂相对较高,这被用于解吸研究中。开发了吸附等温线模型,其中在Langmuir模型中获得了最佳拟合;还评估了吸附剂在三个连续的吸附-解吸循环中的再生和可重复使用性并且被发现保留了吸附能力。

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