Tungala Leela Srinivas, Mekala Suneetha, Pala Sneha Latha, Biftu Wondwosen Kebede, Ravindhranath Kunta
Department of Chemistry, Koneru Lakshmaiah Education Foundation, Green Fields, Vaddeswaram, India.
Department of Chemistry, RGUKT-Nuzvid, Nuzvid, India.
Int J Phytoremediation. 2023;25(5):598-608. doi: 10.1080/15226514.2022.2095975. Epub 2022 Jul 10.
Stem powder and its active carbon plant are identified to have strong adsorptivity for lead ions. The bio-sorbents are characterized by conventional methods including XRD and FTIR analysis. These biomaterials are investigated for their maximum adsorption for lead ions by optimizing the extraction conditions. The maximum removal is observed in the pH range of 6-7 for both sorbents. With stem powders, the removal is 76.0% from a simulated lead solution of concentration: 20.0 mg/L with 1.5 g/L of the sorbent and at an equilibration time of 2.0 h. With the active carbon, the maximum extraction of: 86.0% is observed at pH: 6.5 with 1.0 g/L of the sorbent after an equilibration time of 1.5 h. The sorption capacities are 32.0 mg/g for stem powders, and 40.5 mg/g for active carbon. Many co-ions have marginal interference. Spent adsorbents can be recycled after regeneration. Thermodynamic investigations reveal the spontaneity and endothermic nature of adsorption. High Δ values , 26.45 kJ/mole for AHSP and 46.40 kJ/mole for AHSAC, confirm the bonding of Pb ions with the sorbents is either "ion-exchange" and/or a sort of "complex formation." The disorder at the solid and liquid boundary is indicated by high positive ΔS values and it is a favorable condition for good Pb adsorption. On analysis of different kinetic and isotherm models, the sorption of Pb ions follows Pseudo-2nd order and Langmuir models. This confirms the mono-layer adsorption of Pb ions on the humongous surface of the sorbent. The adsorbents are successfully applied to treat industrial effluent samples.
茎粉及其活性炭植物被鉴定对铅离子具有很强的吸附性。通过包括XRD和FTIR分析在内的常规方法对生物吸附剂进行了表征。通过优化提取条件，研究了这些生物材料对铅离子的最大吸附量。两种吸附剂在pH值为6 - 7的范围内观察到最大去除率。对于茎粉，在吸附剂浓度为1.5 g/L、平衡时间为2.0 h的情况下，从浓度为20.0 mg/L的模拟铅溶液中去除率为76.0%。对于活性炭，在pH值为6.5、吸附剂浓度为1.0 g/L、平衡时间为1.5 h后，观察到最大提取率为86.0%。茎粉的吸附容量为32.0 mg/g，活性炭的吸附容量为40.5 mg/g。许多共存离子的干扰很小。用过的吸附剂再生后可以循环使用。热力学研究揭示了吸附的自发性和吸热性质。高的Δ值，AHSP为26.45 kJ/mol，AHSAC为46.40 kJ/mol，证实了Pb离子与吸附剂的结合是“离子交换”和/或某种“络合物形成”。高的正ΔS值表明固液界面处的无序状态，这是有利于良好Pb吸附的条件。通过对不同动力学和等温线模型的分析，Pb离子的吸附遵循准二级和朗缪尔模型。这证实了Pb离子在吸附剂巨大表面上的单层吸附。这些吸附剂已成功应用于处理工业废水样品。
