SCNU Environmental Research Institute, Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Theoretical Chemistry of Environment, School of Environment, South China Normal University, Guangzhou 510006, China.
State Key Laboratory of Earth Surface Processes and Resource Ecology, Faculty of Geographical Science, Beijing Normal University, Beijing, 100875, China.
Bioresour Technol. 2023 Aug;381:129130. doi: 10.1016/j.biortech.2023.129130. Epub 2023 May 4.
Due to the high biological toxicity, the concurrent elimination of lead (Pb (II)) and methylene blue (MB) has become a challenging problem. Therefore, a newly β-cyclodextrin (β-CD) modified magnetic alginate/biochar (β-CD@MBC) material was developed. Comprehensive characterizations proved the successful coating of β-CD onto MBC surface by microwave-aided fabrication. The β-CD@MBC achieved high-efficiency uptake for contaminants under a wide pH scope. In the dual system, Pb (II) elimination was facilitated with the presence of MB, due to the active sites provided by MB. In the presence of Pb (II), MB uptake was inhibited due to the electrostatic repulsion between positively charged MB and Pb (II). Electrostatic attraction and complexation contributed to capturing Pb (II), while π-π interactions, host-guest effect, and H-bonding were important in MB elimination. After four cycles, β-CD@MBC maintained comparatively good renewability. Findings demonstrated that β-CD@MBC could be an effective remediation material for Pb (II)/MB adsorption from aqueous environments.
由于高生物毒性，同时去除铅（Pb（II））和亚甲基蓝（MB）已成为一个具有挑战性的问题。因此，开发了一种新的β-环糊精（β-CD）修饰的磁性海藻酸盐/生物炭（β-CD@MBC）材料。综合表征证明了微波辅助制造成功地将β-CD涂覆在MBC表面上。β-CD@MBC 在较宽的 pH 范围内对污染物具有高效的去除能力。在双系统中，由于 MB 提供的活性位点，Pb（II）的去除得到了促进。在存在 Pb（II）的情况下，MB 的去除受到带正电荷的 MB 和 Pb（II）之间的静电排斥的抑制。静电吸引和配位作用有助于捕获 Pb（II），而π-π相互作用、主体-客体效应和氢键在 MB 的去除中起着重要作用。经过四个循环，β-CD@MBC 保持了较好的可重复使用性。研究结果表明，β-CD@MBC 可以作为一种有效的修复材料，用于从水环境中吸附 Pb（II）/MB。
