Department of Chemistry, Himachal Pradesh University, Summerhill, Shimla, Himachal Pradesh, India, 171005.
Department of Chemistry, Himachal Pradesh University, Summerhill, Shimla, Himachal Pradesh, India, 171005.
Chemosphere. 2024 Sep;364:143103. doi: 10.1016/j.chemosphere.2024.143103. Epub 2024 Aug 16.
We applied a holistic, sustainable, and green approach to develop an effective multipurpose adsorbent from whole pine needles (PNs), a forest waste lignocellulosic biomass. The PNs were oxidized and modified with phenylhydrazine-4-sulphonic acid (ɸHSOH) to OPN-ɸHSOH. The latter was characterized and tested as an adsorbent for cationic dyes, malachite green (MG), methylene blue (MB), crystal violet (CV), and metal ions (Hg⁺ and Pb⁺). The adsorption followed different kinetic models: Elovich for MG and MB, pseudo-second-order for CV, and pseudo-first-order for Hg⁺ and Pb⁺. Langmuir isotherm indicated maximum adsorption capacities of 303.4 ± 8.91 mgg (MG), 331.4 ± 17.50 mgg (MB), 376.6 ± 22.47 mgg (CV), 210.8 ± 28.86 mgg (Hg⁺), and 172.9 ± 20.93 mgg (Pb⁺) within 30 min. Maximum removal efficiencies were 99.0% (MG), 98.0% (MB), 96.04% (CV), 95.5% (Hg⁺), and 89.8% (Pb⁺). The adsorbent demonstrated significant regeneration and reusability over ten cycles, proving highly efficient for both cationic dyes and metal ions, with wide potential for practical applications where more than one adsorbate is present.
我们采用整体、可持续和绿色的方法，从整个松针（PNs）——一种森林废弃物木质纤维素生物质中开发出一种有效的多用途吸附剂。PNs 被苯肼-4-磺酸（ɸHSOH）氧化和修饰，得到 OPN-ɸHSOH。后者进行了表征并用作阳离子染料、孔雀石绿（MG）、亚甲基蓝（MB）、结晶紫（CV）和金属离子（Hg⁺和 Pb⁺）的吸附剂进行测试。吸附遵循不同的动力学模型：Elovich 模型适用于 MG 和 MB，准二级模型适用于 CV，准一级模型适用于 Hg⁺和 Pb⁺。Langmuir 等温线表明，在 30 分钟内，MG 的最大吸附容量为 303.4 ± 8.91 mgg，MB 的最大吸附容量为 331.4 ± 17.50 mgg，CV 的最大吸附容量为 376.6 ± 22.47 mgg，Hg⁺的最大吸附容量为 210.8 ± 28.86 mgg，Pb⁺的最大吸附容量为 172.9 ± 20.93 mgg。最大去除效率分别为 99.0%（MG）、98.0%（MB）、96.04%（CV）、95.5%（Hg⁺）和 89.8%（Pb⁺）。该吸附剂在十次循环中表现出显著的再生和可重复使用性，对阳离子染料和金属离子都具有高效去除能力，在存在多种吸附质的实际应用中具有广泛的应用潜力。
