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Mechanisms and Factors Influencing Adsorption of Microcystin-LR on Biochars

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Abstract

The adsorption of microcystin-LR (MCLR) by biochar has never been well understood. For the first time, the unconventional adsorption of hydrophilic MCLR on wood-based biochars was comprehensively investigated as a function of biochar properties, environmental temperature, solution pH, coexisting dissolved organic matter (DOM), and polar organic competitors. High-temperature-prepared biochar from 700 °C (BC-700) and low-temperature-prepared biochar from 300 °C (BC-300) were characterized with significantly different surface areas but similar alkaline nature. Despite a very low surface area, BC-300 exhibited very high adsorption capacity, which implies the important contribution of surface groups to biochar. MCLR adsorption on biochars was pH dependent and was strongly reduced by macromolecular DOM. Polycarboxylic aliphatic acids and 2-(2-hydroxyethyl) guanidinium cation, which are similar to specific structural groups in MCLR, exhibited an evident competitive effect. The results indicated that both carboxylic and guanidino groups of MCLR serve significant functions in MCLR adsorption to biochar. The adsorption mechanisms may be primarily related to the columbic attractions and the hydrogen bonding interactions between MCLR and biochar surface. In particular, the irreversible adsorption enhancement of MCLR was observed on BC-700, which suggests that biochar amendment can aid in immobilizing MCLR from water to sediment, thereby prolonging MCLR environmental fate in biochar-amended sediment.

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Acknowledgments

This research was supported by the Natural Science Foundation of Zhejiang Province of China (Y5110268) and the National Natural Science Foundation of China (21177113).

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Authors and Affiliations

  1. State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China

    Liang Li, Yuping Qiu & G. Daniel Sheng

  2. College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou, 310032, China

    Jiexun Huang & Feili Li

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  1. Liang Li
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  2. Yuping Qiu
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  3. Jiexun Huang
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  4. Feili Li
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  5. G. Daniel Sheng
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Correspondence to Yuping Qiu.

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Li, L., Qiu, Y., Huang, J. et al. Mechanisms and Factors Influencing Adsorption of Microcystin-LR on Biochars. Water Air Soil Pollut 225, 2220 (2014). https://doi.org/10.1007/s11270-014-2220-6

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