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Amine-functionalized magnetic biochars derived from invasive plants Alternanthera philoxeroides for enhanced efficient removal of Cr(VI): performance, kinetics and mechanism studies

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Abstract

In this study, novel magnetic biochars derived from Alternanthera philoxeroides and modified by different amines (hexanediamine, melamine, and L-glutathione) were successfully prepared by hydrothermal carbonization and employed as an efficient adsorbent for Cr(VI). When pH = 2.0, T = 25 °C, c0 = 100 mg/L, and the dosage of biochars is 0.05 g, the maximum adsorption capacity of Cr(VI) by pristine biochar (BAP) was 42.47 mg/g and modified biochars (MFBAP, MEBAP, LBAP) was 80.58, 62.26, and 55.66 mg/g, respectively. It was found that hexanediamine and melamine could enhance the SBET of biochars, while L-glutathione could reduce its SBET, which could be supported by BET measurement and SEM images. Adsorption kinetics and isotherm studies showed that the Cr(VI) adsorption process of MFBAP followed Elovich kinetic model and Langmuir isotherm, respectively, which means that it was mainly a chemical adsorption process. The characterization results proved that -NH2 derived from amines plays a significant role in removing Cr(VI), which is mainly degraded by complexation reaction, electrostatic interaction, and reduction. In sum, the biochar modified by amines has excellent Cr(VI) adsorption performance, highly enhanced SBET, and excellent recyclability, which is a promising candidate for solving the problem of invasive plants and wastewater treatment.

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The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Funding

This study was financially supported by the scholars of science and technology activities project of Sichuan province in 2018 and supported by Sichuan Science and Technology Program (2021JDRC0105), the Youth Development Foundation of Chengdu University of Technology in 2021, and State Environmental Protection Key Laboratory of Synergetic Control and Joint Remediation for Soil & Water Pollution (GHBK-2021–007).

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DHY and ZXC contributed to the study conception and design. Material preparation was performed by LX, and data collection and analysis were performed by LX and YYH. The first draft of the manuscript was written by LX, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Haiying Du.

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Luo, X., Du, H., Zhang, X. et al. Amine-functionalized magnetic biochars derived from invasive plants Alternanthera philoxeroides for enhanced efficient removal of Cr(VI): performance, kinetics and mechanism studies. Environ Sci Pollut Res 29, 78092–78106 (2022). https://doi.org/10.1007/s11356-022-20987-4

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